阅读说明：本技术 一种能同时测量爆震燃烧离子信号和燃烧光信号的感应塞 (Induction plug capable of simultaneously measuring detonation combustion ion signal and combustion light signal ) 是由 林伟 史强 晏成龙 王鹏 仝毅恒 赵家丰 陈朋 范良忠 王家森 罗修棋 于 2021-04-16 设计创作，主要内容包括：本发明公开了一种能同时测量爆震燃烧离子信号和燃烧光信号的感应塞,包括安装座、光信号采集组件和两根离子信号探针；安装座安装在爆震燃烧室的侧壁；其中心同轴设有光信号采集通道,前端和后端各设一个离子信号采集通道；光信号采集通道与其中一个压力传感器均处于垂直于爆震波运动方向的同一截面A；光信号采集组件安装在光信号采集通道中,能够采集途径光信号采集组件的爆震燃烧面的光信号,并记录爆震燃烧面的光信号到达截面A的时刻；每个离子信号采集通道中各设置一根离子信号探针。本发明能根据两根离子信号探针的电流导通信号,判断爆震燃烧速度。还能通过燃烧面的发光信号以及爆震燃烧速度,计算诱导区长度等参数。(The invention discloses an induction plug capable of simultaneously measuring a detonation combustion ion signal and a combustion light signal, which comprises a mounting seat, a light signal acquisition assembly and two ion signal probes, wherein the mounting seat is provided with a plurality of ion signal probes; the mounting seat is mounted on the side wall of the detonation combustion chamber; the center of the ion source is coaxially provided with an optical signal acquisition channel, and the front end and the rear end of the ion source are respectively provided with an ion signal acquisition channel; the optical signal acquisition channel and one of the pressure sensors are positioned on the same section A vertical to the movement direction of the detonation wave; the optical signal acquisition assembly is arranged in the optical signal acquisition channel and can acquire an optical signal of a detonation combustion surface of the optical signal acquisition assembly and record the time when the optical signal of the detonation combustion surface reaches the section A; each ion signal acquisition channel is provided with an ion signal probe. The invention can judge the detonation combustion speed according to the current conduction signals of the two ion signal probes. And parameters such as induction zone length and the like can be calculated according to the luminous signal of the combustion surface and the detonation combustion speed.)

1. The utility model provides a can measure inductive plug of knocking combustion ion signal and burning light signal simultaneously which characterized in that: the ion detector comprises a mounting seat, an optical signal acquisition assembly and two ion signal probes;

at least one pressure sensor is arranged on the side wall of the detonation combustion chamber;

the mounting seat is mounted on the side wall of the detonation combustion chamber;

an optical signal acquisition channel is coaxially arranged in the center of the mounting seat, and an ion signal acquisition channel is respectively arranged at the front end and the rear end of the optical signal acquisition channel; the optical signal acquisition channel and one of the pressure sensors are positioned on the same section A vertical to the movement direction of the detonation wave;

the optical signal acquisition assembly is arranged in the optical signal acquisition channel, can acquire an optical signal of a detonation combustion surface of the optical signal acquisition assembly, and records the time t when the optical signal of the detonation combustion surface reaches the section A₁；

Each ion signal acquisition channel is internally provided with an ion signal probe, and the acquisition ends of the two ion signal probes are positioned in the detonation combustion chamber; and judging the detonation combustion speed V according to the current conduction signals of the two ion signal probes.

2. The sensor plug of claim 1 capable of simultaneously measuring a detonation combustion ion signal and a combustion light signal, wherein: the pressure sensor in the section A can collect the time t2 when the shock wave surface of the detonation combustion reaches the section A, and the length L of the induction zone between the shock wave surface and the combustion surface can be calculated by combining the detonation combustion speed V, wherein the specific calculation formula is as follows:

L=V（t₁- t₂）。

3. the sensor plug of claim 1 capable of simultaneously measuring a detonation combustion ion signal and a combustion light signal, wherein: two ion signal probes are symmetrically arranged at the front end and the rear end of the optical signal acquisition assembly.

4. The sensor plug of claim 1 capable of simultaneously measuring a detonation combustion ion signal and a combustion light signal, wherein: the connecting line of the two ion signal probes is parallel to the motion direction of the detonation wave, and the calculation formula of the detonation combustion speed V is as follows:

is the distance between two ion signal probes;the time difference of the current conduction signals of the two ion signal probes is shown.

5. The sensor plug of claim 1 capable of simultaneously measuring a detonation combustion ion signal and a combustion light signal, wherein: the ion signal probe at the front end of the optical signal acquisition assembly is a nickel-silicon probe, and the ion signal probe at the rear end of the optical signal acquisition assembly is a nickel-cadmium probe.

6. The sensor plug of claim 1 capable of simultaneously measuring a detonation combustion ion signal and a combustion light signal, wherein: the optical signal acquisition assembly comprises a crystal element and an optical fiber, one end of the crystal element faces the detonation combustion chamber, the other end of the crystal element is electrically connected with the optical fiber, and the other end of the optical fiber is connected with the photoelectric converter.

7. The sensor plug of claim 1 capable of simultaneously measuring a detonation combustion ion signal and a combustion light signal, wherein: the mounting seat is in a bolt shape and comprises a threaded rod part and a nut arranged at the top end of the threaded rod part, and the bottom end of the threaded rod part extends into the detonation combustion chamber; the mounting seat is installed on the side wall of the detonation combustion chamber in a threaded mode.

8. The sensor plug of claim 7 capable of simultaneously measuring a detonation combustion ion signal and a combustion light signal, wherein: the bottom of the nut positioned at the periphery of the threaded rod part is provided with a sealing groove, and a sealing ring is arranged in the sealing groove.

9. The sensor plug of claim 1 capable of simultaneously measuring a detonation combustion ion signal and a combustion light signal, wherein: the mounting seat is made of polycarbonate.

10. The sensor plug of claim 1 capable of simultaneously measuring a detonation combustion ion signal and a combustion light signal, wherein: the two ends of the optical signal acquisition channel and the two ion signal acquisition channels are provided with chamfers, so that the optical signal acquisition assembly and the corresponding ion signal probe are conveniently sealed and fixed.

Technical Field

The invention relates to the field of aerospace, in particular to an induction plug capable of simultaneously measuring a detonation combustion ion signal and a combustion light signal.

Background

The combustion wave propagating at supersonic speed is called detonation wave, and is formed by coupling a leading shock wave and a combustion zone followed by the leading shock wave, wherein a region between the shock wave and the combustion surface for compressing fuel is an induction zone. The propagation velocity of the detonation wave can reach the magnitude of kilometers per second. The detonation wave is high-speed and high-efficiency combustion, belongs to one combustion form, can release more energy in a short time, and has wide application prospect in various heat energy power devices, particularly the aerospace field based on the advantage that a detonation engine becomes a large research field at present.

During the detonation combustion of a substance, charged radicals, namely charged ions, are generated in the middle of chemical reaction. A short-distance electrode pair which is biased to a certain voltage from the outside is arranged in the combustion device, and the flame reaches the electrode pair to enable the electrode to conduct all signals. According to the ion current signal value of the combustion flame at the moment of contacting the measuring electrode, particularly the arrival moment of the combustion flame, the average flame propagation speed of the combustible mixture under different working conditions can be calculated by combining the arrangement distance of the electrodes. The method becomes an important technology in measuring the speed of combustion flame, particularly the speed of detonation combustion flame, and is also commonly called as an ion probe technology.

In the experimental research and measurement of the detonation wave, the method has important value and significance for the experimental analysis of the detonation wave structure. The primary problem of the analysis of the detonation wave structure is to find out the time when a shock wave surface and a combustion area (flame surface) reach, so as to judge whether the combustion process reaches a detonation state propagated at a detonation speed or not through the speed and the coupling state of the shock wave and the combustion surface. In the process of measuring the speed, a high-frequency pressure sensor records to obtain a pressure signal of knocking combustion, and the speed of the knocking wave deduced from the shock wave travelling speed can also be obtained by measuring the interval between the two sensors. However, in the use process of the sensor, the contact with the flow field causes certain interference to the flow field, and has the problems of impact, combustion damage and the like, the use cost is high (usually one is in ten thousand yuan), the sensor is not suitable for measuring the interval propagation speed of the combustion wave in a large scale, and the sensor has the problems of sealing and the like.

Disclosure of Invention

The present invention provides an inductive plug capable of simultaneously measuring a detonation combustion ion signal and a combustion light signal, which is based on the characteristic that a detonation combustion shock wave surface is coupled with a combustion region, wherein the separation distance between the inductive plug and the combustion light signal, i.e. the thickness of the inductive region, is usually in the millimeter order, i.e. a pressure signal generated by detonation combustion arrives at the ion signal and the light signal approximately at the same time. The propagation speed of flame can be judged by recording the luminous signal of the ion current conduction or the combustion surface of the combustion area instead of the application of a pressure sensor.

In order to solve the technical problems, the invention adopts the technical scheme that:

an induction plug capable of simultaneously measuring a detonation combustion ion signal and a combustion light signal comprises a mounting base, a light signal acquisition assembly and two ion signal probes.

At least one pressure sensor is arranged on the side wall of the detonation combustion chamber.

The mounting seat is mounted on the side wall of the detonation combustion chamber.

The center of the mounting seat is coaxially provided with an optical signal acquisition channel, and the front end and the rear end of the optical signal acquisition channel are respectively provided with an ion signal acquisition channel. The center positions of the optical signal acquisition channel and one of the pressure sensors are both on the same section A vertical to the movement direction of the detonation wave.

The optical signal acquisition assembly is arranged in the optical signal acquisition channel, can acquire an optical signal of a detonation combustion surface of the optical signal acquisition assembly, and records the time t when the optical signal of the detonation combustion surface reaches the section A₁。

And each ion signal acquisition channel is internally provided with an ion signal probe, and the acquisition ends of the two ion signal probes are positioned in the detonation combustion chamber. And judging the detonation combustion speed V according to the current conduction signals of the two ion signal probes.

The pressure sensor in the section A can acquire the time t when the shock wave surface of detonation combustion reaches the section A₂And combining the detonation combustion speed V to calculate the length L of the induction zone between the shock wave surface and the combustion surface, wherein the specific calculation formula is as follows:

L=V（t₁- t₂）。

two ion signal probes are symmetrically arranged at the front end and the rear end of the optical signal acquisition assembly.

The connecting line of the two ion signal probes is parallel to the motion direction of the detonation wave, and the calculation formula of the detonation combustion speed V is as follows:

is the spacing between two ion signal probes.The time difference of the current conduction signals of the two ion signal probes is shown.

The ion signal probe at the front end of the optical signal acquisition assembly is a nickel-silicon probe, and the ion signal probe at the rear end of the optical signal acquisition assembly is a nickel-cadmium probe.

The optical signal acquisition assembly comprises a crystal element and an optical fiber, one end of the crystal element faces the detonation combustion chamber, the other end of the crystal element is electrically connected with the optical fiber, and the other end of the optical fiber is connected with the photoelectric converter.

The mount pad is the bolt form, including screw thread pole portion and the nut that sets up screw thread pole portion top, screw thread pole portion bottom stretches into in the detonation combustion chamber. The mounting seat is installed on the side wall of the detonation combustion chamber in a threaded mode.

The bottom of the nut positioned at the periphery of the threaded rod part is provided with a sealing groove, and a sealing ring is arranged in the sealing groove.

The mounting seat is made of polycarbonate.

The two ends of the optical signal acquisition channel and the two ion signal acquisition channels are provided with chamfers, so that the optical signal acquisition assembly and the corresponding ion signal probe are conveniently sealed and fixed.

The invention has the following beneficial effects:

1. the invention is based on the characteristic that the combustion process (including detonation) usually has luminescence, the flame spontaneously radiates the spectrum in a certain wave band range outwards, the recording of the spectrum signal of the spontaneous radiation has important significance, and the optical signal monitoring has the characteristics of non-contact, quick response and the like, and is important information of the combustion process. Therefore, the detonation combustion pressure signal and the ion signal and the optical signal reach approximately simultaneously, and the detonation combustion pressure signal and the ion signal and the optical signal reach approximately simultaneously. On one hand, the detonation combustion speed can be judged by recording the ion current conduction signal of the combustion area; on the other hand, the length of the induction zone between the shock wave surface and the combustion surface can be calculated by replacing one pressure sensor with the luminous signal of the combustion surface, combining the luminous signal with the other pressure sensor and combining the judged detonation combustion speed.

2. The method is suitable for analyzing the fine structure of the detonation wave, and can judge the coupling degree of the shock wave surface and the combustion surface by combining the pressure information of synchronous measurement to solve the problem of distinguishing the detonation wave from the detonation wave in the detonation combustion measurement.

3. The invention has simple structure, can scale and is beneficial to quantitative production, convenient to install and adopts integral installation. The optical fiber is not in direct contact with the detonation wave, the influence on the propagation of the detonation wave is small, and the obtained data is accurate.

Drawings

Fig. 1 is a schematic structural diagram of an inductive plug capable of simultaneously measuring a detonation combustion ion signal and a combustion light signal according to the present invention.

FIG. 2 is a longitudinal cross-sectional view of an inductive plug of the present invention capable of simultaneously measuring a detonation combustion ion signal and a combustion light signal.

Among them are:

1. a nut; 2. a sealing groove; 3. a threaded shank portion; 4. an optical signal acquisition channel; 5. a first ion signal acquisition channel; 6. a second ion signal acquisition channel; 7. a first ion signal probe; 8. a second ion signal probe; 9. an optical fiber; 10. a crystal element.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.

In the description of the present invention, it is to be understood that the terms "left side", "right side", "upper part", "lower part", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and that "first", "second", etc., do not represent an important degree of the component parts, and thus are not to be construed as limiting the present invention. The specific dimensions used in the present example are only for illustrating the technical solution and do not limit the scope of protection of the present invention.

At least one pressure sensor, preferably one pressure sensor, is mounted on the side wall of the detonation combustion chamber and is located on a section A perpendicular to the motion direction of the detonation wave.

As shown in fig. 1 and 2, an inductive plug capable of simultaneously measuring a detonation combustion ion signal and a combustion optical signal comprises a mounting seat, an optical signal acquisition assembly and two ion signal probes.

The mounting seat is preferably made of polycarbonate materials and has excellent insulating property and thermal aging resistance.

The mounting seat is preferably detachably mounted on the side wall of the detonation combustion chamber and is further in threaded connection. The mount pad is preferred to be the bolt form, including screw thread pole portion 3 and the nut 1 that sets up screw thread pole portion top, and screw thread pole portion bottom stretches into in the detonation combustion chamber to with the combustion chamber inner wall face parallel and level. The two ion signal probes (the preferred diameter is 1 mm) and the optical fiber have small diameters (the preferred diameter is 0.2 mm), the size of the mounting seat can be processed according to specific experimental conditions (6 mm-14 mm), and the interference to a flow field is small.

When the induction plug does not need to be installed, the threaded hole for installing the induction plug on the side wall of the detonation combustion chamber can be sealed and plugged.

Further, the nut bottom that is located the screw rod portion periphery is provided with seal groove 2, is provided with the sealing washer in the seal groove.

The center of the mounting seat is coaxially provided with an optical signal acquisition channel 4, the front end and the rear end of the optical signal acquisition channel are respectively provided with an ion signal acquisition channel, and the ion signal acquisition channels are preferably symmetrically arranged at the front end and the rear end of the optical signal acquisition channel.

Both ends of the optical signal acquisition channel and the two ion signal acquisition channels are preferably provided with chamfers, so that the optical signal acquisition assembly and the corresponding ion signal probe are conveniently sealed and fixed.

The optical signal acquisition channel and one of the pressure sensors are positioned on the same section A vertical to the movement direction of the detonation wave.

The optical signal acquisition assembly is preferably fixed in the optical signal acquisition channel in an adhering mode, can acquire an optical signal of a detonation combustion surface of the optical signal acquisition assembly, and records the time t when the optical signal of the detonation combustion surface reaches the section A₁。

The optical signal acquisition assembly preferably comprises a crystal element 10 and an optical fiber 9, one end of the crystal element faces the detonation combustion chamber and is preferably flush with the inner surface of the base; the other end of the crystal element is electrically connected with the optical fiber, and the other end of the optical fiber is connected with the photoelectric converter. The optical fiber is not in direct contact with the detonation wave, the influence on the propagation of the detonation wave is small, and the obtained data is accurate.

And each ion signal acquisition channel is internally provided with an ion signal probe, and the acquisition ends of the two ion signal probes are positioned in the detonation combustion chamber and are preferably flush with the inner surface of the base. The ion signal probe and the ion signal acquisition channel are preferably fixed in a sealing manner by bonding.

The two ion signal acquisition channels are respectively a first ion signal acquisition channel 5 and a second ion signal acquisition channel 6. The first ion signal acquisition channel is located at the front end of the optical signal acquisition channel (i.e. located at the upstream of the optical signal acquisition channel), and the second ion signal acquisition channel is located at the rear end of the optical signal acquisition channel.

The two ion signal probes are respectively a first ion signal probe 7 and a second ion signal probe 8. Wherein, the first ion signal probe 7 is preferably a nickel silicon probe, and the second ion signal probe 8 is preferably a nickel cadmium probe. The nickel cadmium-nickel silicon materials are respectively used as the anode and the cathode, can bear thousands of high temperature, and has the advantages of good linearity, strong oxidation resistance and high sensitivity.

Firstly, judging the detonation combustion speed V

According to the invention, the detonation combustion speed V is judged according to the current conduction signals of the two ion signal probes. Preferably, the connecting line of the two ion signal probes is parallel to the motion direction of the detonation wave, and then the calculation formula of the detonation combustion speed V is as follows:

is the spacing between two ion signal probes.The time difference of the current conduction signals of the two ion signal probes is shown.

Secondly, calculating the length L of an induction zone between the shock wave surface and the combustion surface

The pressure sensor in the section A can collect the time t2 when the shock wave surface of the detonation combustion reaches the section A, and the length L of the induction zone between the shock wave surface and the combustion surface can be calculated by combining the detonation combustion speed V, wherein the specific calculation formula is as follows:

L=V（t₁- t₂）。

although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the embodiments, and various equivalent modifications can be made within the technical spirit of the present invention, and the scope of the present invention is also within the scope of the present invention.