阅读说明：本技术 基于声学测量的喷注孔检测系统及方法 (Injection hole detection system and method based on acoustic measurement ) 是由 周文元 吴凌峰 杨成虎 姚锋 赵婷 陈泓宇 刘昌国 于 2020-12-22 设计创作，主要内容包括：本发明提供了一种基于声学测量的喷注孔检测系统,包括：工作介质供应装置、喷注器、有机玻璃薄圆板和声学采集装置,其中,工作介质供应装置连接喷注器；喷注器上设置有喷注孔,喷注孔出口具有间隔距离处布置有机玻璃薄圆板；喷注孔出来的液体射流垂直打在有机玻璃薄圆板上；喷注器一侧布置声学采集装置,通过采集液体射流撞击有机玻璃薄圆板的声学频率判断射流状态,检测喷注孔的加工质量。本发明通过设置声学采集装置利用声学频率对喷注孔的加工质量进行检测,相对于传统的收集测量法,更加的准确、快捷,将不易观察分辨的射流形态有形化,便于检测。(The invention provides an injection hole detection system based on acoustic measurement, which comprises: the device comprises a working medium supply device, an injector, an organic glass thin circular plate and an acoustic acquisition device, wherein the working medium supply device is connected with the injector; an injection hole is formed in the injector, and an organic glass thin circular plate is arranged at a position with a spacing distance from the outlet of the injection hole; liquid jet flow from the injection hole vertically hits on the organic glass thin circular plate; an acoustic acquisition device is arranged on one side of the injector, the jet state is judged by acquiring the acoustic frequency of the liquid jet impacting the organic glass thin circular plate, and the processing quality of the injection hole is detected. The invention detects the processing quality of the injection hole by arranging the acoustic acquisition device and utilizing the acoustic frequency, is more accurate and quicker compared with the traditional collection measurement method, shapes the jet form which is difficult to observe and distinguish, and is convenient to detect.)

1. An insufflating orifice detection system based on acoustic measurements, comprising: a working medium supply device (1), an injector (2), an organic glass thin circular plate (3) and an acoustic acquisition device (4),

the working medium supply device (1) is connected with the injector (2);

an injection hole is formed in the injector (2), and an organic glass thin circular plate (3) is arranged at the position of an outlet of the injection hole at a spacing distance L;

the liquid jet flow from the injection hole vertically hits an organic glass thin circular plate (3);

an acoustic acquisition device (4) is arranged on one side of the injector (2), the jet state is judged by acquiring the acoustic frequency of the liquid jet impacting the organic glass thin circular plate (3), and the processing quality of the injection hole is detected.

2. An orifice detection system based on acoustic measurements according to claim 1, characterized in that said liquid jets comprise an aggregate bundled jet of qualified orifices and a divergent jet of orifices with machining problems.

3. Injection hole detection system based on acoustic measurements according to claim 2, characterized by the fact that the distance L from the injection hole exit to the plexiglas thin circular plate (3) is determined by careful observation and comparison of the convergent bundled jet for a qualified injection hole and the divergent jet pattern of an injection hole with machining problems.

4. An orifice detection system based on acoustic measurements, according to claim 2, characterized in that said acoustic frequency criterion of the jet impinging on the circular plate is pre-calibrated by the frequency of the focused beam jet of a qualified orifice, denoted as calibration frequency f₀。

5. Insufflating orifice detection system based on acoustic measurements according to claim 4, characterized in that said acoustic acquisition means (4) acquire the frequency f of the liquid jet and a calibration frequency f₀And comparing and judging whether the corresponding injection hole is qualified.

6. Injection hole detection system based on acoustic measurements, according to claim 1, characterized by further comprising a working medium collection barrel (5), said working medium collection barrel (5) being arranged below said injector (2) and said plexiglas plectane (3).

7. An injection hole detection method based on acoustic measurement, characterized in that the injection hole processing quality is detected by using the injection hole detection system based on acoustic measurement according to any one of claims 1-6.

8. An injection orifice detection method based on acoustic measurements according to claim 7, characterized in that it comprises the following steps:

step 1: completing the assembly of an injection hole detection system based on acoustic measurement;

step 2: after the assembly is finished, calibrating the frequency of the gathered bundled jet flow of the qualified jet hole in advance, and recording the frequency as the calibration frequency f₀；

And step 3: measuring the frequency f of the liquid jet flow from all the injection holes by using an acoustic acquisition device (4);

and 4, step 4: the measured frequency f and the calibrated frequency f₀Comparing if the frequency f is equal to the nominal frequency f₀If the difference is within 5%, the processing quality of the corresponding injection hole is qualified; if the frequency f and the calibration frequency f are within the measuring error range of the equipment₀If the difference exceeds 5%, the corresponding injection hole has the problem of processing quality;

and 5: and if the detected injection hole has the processing quality problem, repairing the injection hole to enable the injection hole to meet the design requirement.

Technical Field

The invention relates to the technical field of engines, in particular to an injection hole detection system and method based on acoustic measurement.

Background

As the engine injector is usually made of materials with high strength and high hardness, such as titanium alloy and the like, metal chips are accumulated in a limited drill chip groove in the cutting process of the injection hole, and the surface roughness of the hole wall is increased due to the chips like grinding materials, so that sharp edges of the inlet and the outlet of the hole are damaged and burrs are formed. The single-hole flow and the injection atomization state of the propellant are directly influenced by the processing problem of the injection hole, so that the combustion of a combustion chamber is uneven, the efficiency is low, and the throat part of the spray pipe is burnt through by local high temperature; the unstable burning makes the structure vibrate and destroy, reduces the operational reliability.

At present, the machining quality detection of an injection hole of an engine generally adopts a jet form observation and jet collection weighing method. The jet streams of the injection holes are gathered into a bundle, which is one of the qualified important conditions of the injection holes, when the injection holes have the conditions of rough inner surface, burrs or damage of sharp edges of an inlet and an outlet, the jet streams cannot keep the state of gathering into the bundle, and the jet streams are unstable in turbulence and are scattered at a position which is close to the outlet to form discrete liquid drops. On the other hand, the design of the injector requires that the injection holes with the same aperture have consistent flow, and the injection hole flow with the processing problem is smaller than that of other qualified holes. Injection holes with processing problems can be detected by collecting and weighing streams of injection holes having the same diameter per unit time (typically 3-5 minutes).

The liquid flow test usually adopts an aqueous medium, is colorless and transparent, and simultaneously has dense arrangement of injection holes on an injector, so that the jet form is difficult to observe and distinguish; on the other hand, the judgment of the jet flow form belongs to qualitative analysis, and certain subjectivity and errors exist. Collection methods a long collection time is selected to ensure accuracy, and a measuring cylinder of several hundred milliliters is required to meet the weighing requirements under the condition of a large injection flow. Under the conditions that the opening of the measuring cylinder is large and the arrangement of the injection holes is dense, the measuring cylinder cannot be reasonably arranged due to spatial interference in single measurement, and new errors are easily introduced in the measurement in multiple times. The existing detection method can not meet the engineering requirements, so that the key for designing a new detection method is to overcome the problems.

Through a search, patent document CN203685413U discloses a self-impact strut injector in an air-breathing engine, which is mainly used for injecting fuel into a combustion chamber of a scramjet engine with a high mach number. According to the self-impact support plate injector, a plurality of injection holes are formed in a self-impact support plate, the central lines of two adjacent injection holes are intersected, so that fuel and air are stably and efficiently mixed in the injection holes, and meanwhile, a fuel cavity and a base of the self-impact support plate injector are of an integrated structure. However, the prior art does not solve the existing processing problems.

Disclosure of Invention

In view of the shortcomings in the prior art, it is an object of the present invention to provide a system and method for detecting an injector orifice based on acoustic measurements. So as to improve the atomization effect of the injector and obviously improve the working performance and reliability of the engine.

According to the invention, the injection hole detection system based on acoustic measurement comprises: a working medium supply device, an injector, an organic glass thin circular plate and an acoustic acquisition device,

wherein the working medium supply device is connected with the injector; an injection hole is formed in the injector, and an organic glass thin circular plate is arranged at the position of an outlet of the injection hole at a spacing distance L; liquid jet flow from the injection hole vertically hits on the organic glass thin circular plate;

an acoustic acquisition device is arranged on one side of the injector, the jet state is judged by acquiring the acoustic frequency of the liquid jet impacting the organic glass thin circular plate, and the processing quality of the injection hole is detected.

Preferably, the liquid jets comprise an aggregate bundled jet of acceptable injection holes and a divergent jet of injection holes that have machining problems.

Preferably, the distance L from the injection hole outlet to the plexiglas thin circular plate is determined by careful observation and comparison of the focused bundled jet for a qualified injection hole and the divergent jet morphology for an injection hole with machining problems.

Preferably, the acoustic frequency criterion of the impact of the jet on the circular plate is calibrated beforehand by the frequency of the focused beam jet of the acceptable jet orifice, denoted as the calibration frequency f₀。

Preferably, the frequency f of the liquid jet collected by the acoustic collection device is equal to the calibration frequency f₀And comparing and judging whether the corresponding injection hole is qualified.

Preferably, the device further comprises a working medium collecting barrel, wherein the working medium collecting barrel is arranged below the injector and the organic glass thin circular plate.

According to the invention, the detection of the processing quality of the injection hole is carried out by using the injection hole detection system based on the acoustic measurement according to any one of claims 1 to 6.

Preferably, the method comprises the following steps:

step 1: completing the assembly of an injection hole detection system based on acoustic measurement;

step 2: after the assembly is finished, calibrating the frequency of the gathered bundled jet flow of the qualified jet hole in advance, and recording the frequency as the calibration frequency f₀；

And step 3: measuring the frequency f of liquid jet flow from all the injection holes by using an acoustic acquisition device;

and 4, step 4: the measured frequency f and the calibrated frequency f₀Comparing if the frequency f is equal to the nominal frequency f₀If the difference is within 5%, the processing quality of the corresponding injection hole is qualified; if the frequency f is equal to the calibration frequency f₀If the difference is more than 5%, the corresponding injection hole has the problem of processing quality;

and 5: and if the detected injection hole has the processing quality problem, repairing the injection hole to enable the injection hole to meet the design requirement.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention detects the processing quality of the injection hole by arranging the acoustic acquisition device and utilizing the acoustic frequency, is more accurate and quicker compared with the traditional collection measurement method, shapes the jet form which is difficult to observe and distinguish, and is convenient to detect.

2. The invention can observe the processing condition of the injection hole in real time by using the injection hole detection method based on acoustic measurement, thereby improving the atomization effect of the injector and obviously improving the working performance and reliability of the engine.

3. The invention aims to solve the technical problems of rapidly detecting burrs, scraps and rough inner surface in the process of processing the injection hole, improving the atomization effect of the injector and improving the working performance and reliability of an engine.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a schematic view of an orifice detection system based on acoustic measurements according to the present invention;

fig. 2 is a schematic diagram of different forms of jet flow of the injection hole in the invention.

In the figure:

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.

As shown in fig. 1 and 2, the present invention provides an injection hole detection system based on acoustic measurement, comprising: the device comprises a working medium supply device 1, an injector 2, an organic glass thin circular plate 3, an acoustic acquisition device 4 and a working medium collecting barrel 5, wherein the working medium supply device 1 is connected with the injector 2; an injection hole is formed in the injector 2, and an organic glass thin circular plate is arranged at the position of the injection hole at a distance L; the liquid jet flow from the injection hole vertically hits on the organic glass thin circular plate 3; an acoustic acquisition device 4 is arranged on one side of the injector, the jet state is judged by acquiring the acoustic frequency of the liquid jet impacting the organic glass thin circular plate 3, and the processing quality of the injection hole is detected. The working medium collection barrel 5 is disposed below the injector 2 and the plexiglas thin circular plate 3.

Further, the liquid jets include converging bundled jets of acceptable orifice and diverging jets of orifice with machining problems. The distance L from the jetting hole outlet to the organic glass thin circular plate is determined by careful observation and comparison of the forms of the collected bundled jet of the qualified jetting holes and the divergent jet of the jetting holes with processing problems, and engineering test experience is summarized through multiple times of adjustment.

Still further, the sound frequency determination criterion of the jet impinging on the circular plate is obtained by calibrating the frequency of the focused beam jet of the qualified jet hole in advance, and is denoted as a calibration frequency f₀. The frequency f and the calibration frequency f of the liquid jet flow collected by the acoustic collecting device₀And comparing and judging whether the corresponding injection hole is qualified. When the beam-shaped continuous jet flow impacts the circular plate, the frequency is related to the surface wave frequency of the jet flow, and the frequency is lower; the jet orifice jets, which present machining problems, are already spread out and are not continuous before they hit the circular plate, interacting with the circular plate in a large number of discrete droplets, the frequency being related to the number of droplets.

In fig. 2, a is the converging bundled jet of a qualified orifice and B is the diverging jet of an orifice with machining problems.

The invention provides an injection hole detection method based on acoustic measurement, which comprises the following steps:

step 1: completing the assembly of an injection hole detection system based on acoustic measurement;

step 2: after the assembly is finished, calibrating the frequency of the gathered bundled jet flow of the qualified jet hole in advance, and recording the frequency as the calibration frequency f₀；

And step 3: measuring the frequency f of liquid jet flow from all the injection holes by using an acoustic acquisition device;

and 4, step 4: the measured frequency f and the calibrated frequency f₀Comparing if the frequency f is equal to the nominal frequency f₀If the difference is within 5%, the processing quality of the corresponding injection hole is qualified; if the frequency f is equal to the calibration frequency f₀If the difference is more than 5%, the corresponding injection hole has the problem of processing quality;

and 5: and if the detected injection hole has the processing quality problem, repairing the injection hole to enable the injection hole to meet the design requirement.

The invention relates to a liquid rocket engine for a spacecraft propulsion system, in particular to an injection hole detection method and system based on acoustic measurement. The invention aims to solve the technical problems of rapidly detecting burrs, scraps and rough inner surface in the process of processing the injection hole, improving the atomization effect of the injector and improving the working performance and reliability of an engine.

In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application 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 thus, should not be construed as limiting the present application.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.