阅读说明：本技术 一种发动机叶尖传感器高温性能验证系统及方法 (High-temperature performance verification system and method for engine blade tip sensor ) 是由 叶德超 周琦 段发阶 李杨宗 刘志博 郭岩 于 2018-09-12 设计创作，主要内容包括：本发明的公开了一种发动机叶尖传感器高温性能验证系统及方法,系统包括通风控制模块、电参数测量模块、温度测量模块、数据处理模块和高温加热装置,所述高温加热装置包括通孔、炉膛和保温层,炉膛内温度可控制在25-1600℃的变化,模拟探头表面工作环境温度,待测叶尖传感器放置于所述炉膛内,叶尖传感器探头端部两侧、探头及叶尖传感器线缆处均设有热电偶,所述热电偶与电参数测量模块和数据处理模块电连接,电参数测量模块和数据处理模块分别与数据处理模块连接,炉膛内还设有与所述通风控制模块相连的出气管和进气管,用于模拟实际安装环境下发动机机匣壁和保温层之间的气流环境。(The invention discloses a system and a method for verifying the high-temperature performance of an engine blade tip sensor, the system comprises a ventilation control module, an electrical parameter measuring module, a temperature measuring module, a data processing module and a high-temperature heating device, the high-temperature heating device comprises a through hole, a hearth and a heat preservation layer, the temperature in the hearth can be controlled to be changed at 25-1600 ℃, the working environment temperature of the surface of the probe is simulated, the blade tip sensor to be measured is placed in the hearth, thermocouples are arranged on the two sides of the probe end part of the blade tip sensor, the probe and the cable of the blade tip sensor, the thermocouple is electrically connected with the electrical parameter measuring module and the data processing module, the electrical parameter measuring module and the data processing module are respectively connected with the data processing module, and an air outlet pipe and an air inlet pipe which are connected with the ventilation control module are further arranged in the hearth and are used for simulating the air flow environment between the wall of the engine case and the heat insulation layer in the actual installation environment.)

1. A high-temperature performance verification system of an engine blade tip sensor is characterized by comprising a ventilation control module, an electrical parameter measuring module, a temperature measuring module, a data processing module and a high-temperature heating device, the high-temperature heating device comprises a through hole, a hearth and a heat-insulating layer, the temperature in the hearth can be controlled within the range of 25-1600 ℃, used for simulating the surface working environment temperature of the probe, the blade tip sensor to be measured is placed in the hearth, thermocouples are arranged on the two sides of the probe end part of the blade tip sensor and the cable parts of the probe and the blade tip sensor, the thermocouple is electrically connected with the electrical parameter measuring module and the data processing module which are respectively connected with the data processing module, and an air outlet pipe and an air inlet pipe which are connected with the ventilation control module are also arranged in the hearth and are used for simulating the airflow environment between the wall of the engine case and the heat-insulating layer in the actual installation environment.

2. The system for verifying high-temperature performance of the engine blade tip sensor according to claim 1, wherein the temperature range of hot air entering the air inlet pipe is controlled to be 25-500 ℃.

3. An engine blade tip sensor high-temperature performance verification method is based on the engine blade tip sensor high-temperature performance verification system of claim 1, and is characterized by comprising the following steps of:

(1) carrying out finite element high-temperature thermal simulation on the blade tip sensor:

according to the structure and the selected materials of the blade tip sensor, combining the high-temperature environment in the high-temperature heating device, carrying out high-temperature thermal simulation on a finite element of the blade tip sensor, determining the overall temperature distribution of the sensor probe in a high-temperature severe environment, and determining whether the mechanical structure deformation degree of the blade tip sensor and the overall temperature value of the blade tip sensor probe are both below the working temperature of the selected materials according to the simulation result of the finite element, so that the mechanical structure and the sensor structure materials of the blade tip sensor meeting the requirements of the test environment are preliminarily determined through finite element simulation;

(2) and (3) simulating an industrial field environment to perform an experiment:

taking the integral temperature distribution result of the finite element simulated blade tip sensor in the step (1) as a high-temperature experimental basis, heating the temperature by a high-temperature heating device, taking thermocouple monitoring temperature data as a reference, and heating until the integral temperature distribution of the probe of the blade tip sensor is consistent with the finite element simulated temperature distribution to be an experimental temperature test point; at the moment, a constant temperature field in the high-temperature heating device can be equivalent to a high-temperature environment at the high-pressure turbine blade tip clearance, namely the high-temperature environment for the actual work of the blade tip sensor is indirectly simulated through the high-temperature heating device;

(3) evaluating the working performance of the blade tip sensor:

and testing the signal modulation output of the tip sensor probe by using the electrical parameter measurement module by taking the experimental temperature test point as a working temperature reference, and judging the working performance of the tip sensor at high temperature by comparing the signal modulation output of the tip sensor probe at the test temperature and at the normal temperature.

Technical Field

The invention belongs to the technical field of sensor precision measurement, and particularly relates to a system and a method for verifying high-temperature performance of an engine blade tip sensor.

Background

Dynamic parameters of the high-speed rotating rotor blade in an industrial field are important for guaranteeing the operation safety and the working efficiency of large-scale rotating equipment. The dynamic parameters of the blade, such as blade vibration, blade tip clearance and the like, can provide visual basis for judging the running state and the fault characteristics of the rotor, and have practical theoretical and application values for improving the development level of large-scale rotating equipment and verifying the design performance parameters. At present, huge resources are invested by aviation engine manufacturing enterprises such as GE, P & W, Rolls-Royce and research institutions such as NASA, Federal Aviation Administration (FAA), and NaWC (naval air combat center) to apply and research on dynamic parameters of rotor blades.

Based on the practical application requirements, non-contact sensors for detecting blade vibration (tip vibration) and tip clearance of dynamic parameters of the blade, which are collectively called tip sensors, are produced, and the tip sensors include but are not limited to capacitance sensors, eddy current sensors and optical fiber sensors. Based on a non-contact measurement principle, the blade tip sensor is installed on a turbine casing, a sensor probe directly and radially aligns to the sweeping position of the blade tip of the rotor blade, and data such as blade vibration, blade tip clearance and the like can be obtained in real time according to the sensor measurement principle. The non-contact measuring method is simple, convenient and economical, and is a development trend of an online detection technology of the rotor blade of the engine.

Meanwhile, in an industrial field, the blade works in a high-temperature environment, the surface temperature of the probe ranges from normal temperature to 1600 ℃, the temperature of the rear end of the probe is influenced by the cooling flow channel and can be controlled to be between the normal temperature and 500 ℃, so that the blade tip sensor has certain high-temperature resistance aiming at a compressor-grade blade (the highest 650 ℃) and a turbine-grade blade (the highest 1600 ℃), and the continuous, stable and accurate work of the blade tip sensor in the high-temperature environment is ensured. The method aims to solve the important problem that the high-temperature performance of the existing blade tip sensor cannot be verified before being formally used in an industrial field, and ensures that the blade tip sensor can work stably, accurately and efficiently for a long time in the industrial field. It is highly desirable to perform verification of the high temperature performance of the tip sensor prior to installation. At present, no device and method specially used for verifying the high-temperature performance of the blade tip sensor exist.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a system and a method for verifying the high-temperature performance of an engine blade tip sensor.

The purpose of the invention is realized by the following technical scheme:

a high-temperature performance verification system for an engine tip sensor comprises a ventilation control module, an electrical parameter measuring module, a temperature measuring module, a data processing module and a high-temperature heating device, wherein the high-temperature heating device comprises a through hole, a hearth and a heat preservation layer, the temperature in the hearth can be controlled to be changed within 25-1600 ℃, the surface working environment temperature of a simulation probe is simulated, the tip sensor to be detected is placed in the hearth, thermocouples are arranged on two sides of the probe end part of the tip sensor, the probe and a cable of the tip sensor, the thermocouples are electrically connected with the electrical parameter measuring module and the data processing module, the electrical parameter measuring module and the data processing module are respectively connected with the data processing module, an air outlet pipe and an air inlet pipe which are connected with the ventilation control module are further arranged in the hearth and are used for simulating the airflow environment between the wall of an, the air inlet pipe can control hot air of 25-500 ℃, and the air outlet pipe is responsible for exhausting air, so that the ambient temperature near the driving cable of the sensor can be kept within the range of 25-500 ℃ of a set value, and various industrial field environments can be simulated.

A high-temperature performance verification method for an engine blade tip sensor comprises the following steps:

(1) carrying out finite element high-temperature thermal simulation on the blade tip sensor:

according to the structure and the selected materials of the blade tip sensor, combining the high-temperature environment in the high-temperature heating device, carrying out high-temperature thermal simulation on a finite element of the blade tip sensor, determining the overall temperature distribution of the sensor probe in a high-temperature severe environment, and determining whether the mechanical structure deformation degree of the blade tip sensor and the overall temperature value of the blade tip sensor probe are both below the working temperature of the selected materials according to the simulation result of the finite element, so that the mechanical structure and the sensor structure materials of the blade tip sensor meeting the requirements of the test environment are preliminarily determined through finite element simulation;

(2) and (3) simulating an industrial field environment to perform an experiment:

taking the integral temperature distribution result of the finite element simulated blade tip sensor in the step (1) as a high-temperature experimental basis, heating the temperature by a high-temperature heating device, taking thermocouple monitoring temperature data as a reference, and heating until the integral temperature distribution of the probe of the blade tip sensor is consistent with the finite element simulated temperature distribution to be an experimental temperature test point; at the moment, a constant temperature field in the high-temperature heating device can be equivalent to a high-temperature environment at the high-pressure turbine blade tip clearance, namely the high-temperature environment for the actual work of the blade tip sensor is indirectly simulated through the high-temperature heating device;

(3) evaluating the working performance of the blade tip sensor:

and testing the signal modulation output of the tip sensor probe by using the electrical parameter measurement module by taking the experimental temperature test point as a working temperature reference, and judging the working performance of the tip sensor at high temperature by comparing the signal modulation output of the tip sensor probe at the test temperature and at the normal temperature.

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

1. the high-temperature performance of the blade tip sensor can be verified through the method, and whether the static compensation of the sensor meets the working requirement or not is judged;

2. the invention solves the important problem that the high-temperature performance of the blade tip sensor can not be verified before being formally used in the industrial field, and ensures that the blade tip sensor can work stably, accurately and efficiently for a long time in the industrial field.

Drawings

FIG. 1 is a schematic diagram of the high temperature performance verification system of the present invention.

Fig. 2 is a schematic view of the mechanism of the high-temperature heating apparatus.

Fig. 3 is a schematic view of the experimental state in the furnace of the high-temperature heating device.

FIG. 4 is a schematic diagram of the connection relationship between modules in the high temperature performance verification system of the present invention.

FIG. 5 is a flow chart of the high temperature performance verification method of the present invention.

Fig. 6 is a schematic view of the blade tip sensor working process, where the left side of the flow chart shows the components of the blade tip sensor, and the right side shows the corresponding functions of the components.

Reference numerals: 1-ventilation control module, 2-electrical parameter measuring module, 3-temperature measuring module, 4-data processing module, 5-high-temperature heating device, 6-through hole, 7-hearth, 8-heat insulation layer, 9-thermocouple, 10-air outlet pipe, 11-air inlet pipe, 12-sensor cable, 13-tip sensor and 14-clamp

Detailed Description

The invention will be further described with reference to figures 1 to 6.

The invention protects a high-temperature performance verification system of an engine blade tip sensor, which comprises a ventilation control module 1, an electrical parameter measuring module 2, a temperature measuring module 3, a data processing module 4 and a high-temperature heating device 5, wherein the high-temperature heating device 5 comprises a through hole 6, a hearth 7 and a heat insulation layer 8, the heat insulation layer 8 ensures that the internal temperature of the hearth can be kept stable for a long time, the internal temperature environment of an industrial field casing is simulated, and the temperature in the hearth can be controlled to be changed within the range of 25-1600 ℃; the apex sensor 13 that awaits measuring is placed in the said burner hearth 7, fixed by the clamp 14, both sides of tip sensor probe tip end, probe and apex sensor cable 12 department all have thermocouples 9, for the temperature indicator of the different positions of sensor, the thermocouple 9 is connected with electrical parameter measurement module 2 and data processing module 4 electricity, the electrical parameter measurement module 2 and data processing module 4 are connected with data processing module 4 separately, still there are outlet duct 10 and inlet duct 11 connected with ventilation control module 1 in the burner hearth 7, in order to this simulation engine casket wall and heat preservation air current environment under the actual installation environment, the inlet duct enters the hot air, the temperature can be set for, the temperature range is 25-500 degrees centigrade, the outlet duct is responsible for exhausting, can drive the ambient temperature near the cable simulation actual industrial site environment to the sensor like this. The high-temperature performance verification method of the engine blade tip sensor comprises the following steps:

firstly, carrying out finite element high-temperature thermal simulation on the blade tip sensor.

According to the high-temperature-resistant tip sensor structure and the selected structural materials, the high-temperature environment in the high-pressure turbine is combined, the finite element high-temperature thermal simulation of the tip sensor is carried out, and the integral temperature distribution of the sensor probe in the high-temperature severe environment of the high-pressure turbine is determined. And determining whether the mechanical structure deformation degree of the blade tip sensor and the integral temperature value of the sensor probe are both below the working temperature of the selected material by referring to a finite element simulation result, thereby preliminarily determining the mechanical structure of the sensor and the available structural material of the sensor which meet the requirements of the test environment through finite element simulation.

And secondly, simulating an industrial field environment by using a high-temperature performance verification system of the engine blade tip sensor to perform an experiment on the developed high-temperature resistant blade tip sensor.

Taking a high-temperature experimental furnace as a high-temperature heating device, vertically placing a blade tip sensor to be detected into a through hole of the high-temperature furnace, and placing the blade tip sensor at the junction position of the through hole and a hearth; placing thermocouples at each position to be measured, wherein the specific positions are shown in fig. 3, and using the thermocouples as temperature indicators at different parts of the sensor to monitor the temperature in real time; the air inlet pipe and the air vent pipe are placed in the through hole and connected with the ventilation control module, parameters of the ventilation control module are set to simulate the airflow environment between the casing wall and the heat insulation layer, hot air with the temperature of about 500 ℃ enters the air inlet pipe, and the air outlet pipe is responsible for exhausting air, so that the ambient temperature near the sensor driving cable can be kept at about 500 ℃, and the industrial field environment is simulated; connecting a signal conditioning module of the blade tip sensor with an electrical parameter measuring module to convert other signals into electrical signals; and the temperature measuring module and the electrical parameter measuring module are respectively connected with the data processing module to obtain the real-time output of the blade tip sensor.

The specific experimental procedures are as follows:

1. and taking the integral temperature distribution result of the blade tip sensor obtained in the first step of operation as a high-temperature experiment temperature basis, starting a high-temperature furnace for heating, introducing hot air with preset temperature through an air inlet pipe, taking thermocouple monitoring temperature data as a reference, and heating until the integral temperature distribution of the sensor probe is consistent with the finite element simulation temperature distribution to be an experiment temperature test point.

2. The output change caused by the temperature change is obtained through the data processing module for subsequent analysis and processing. Through specific experimental operation, the constant temperature field in the high-temperature furnace can be considered to be equivalent to the high-temperature environment at the high-pressure turbine blade tip clearance, namely the high-temperature environment for the actual work of the high-temperature-resistant capacitance sensor is indirectly simulated through the high-temperature furnace.

And thirdly, evaluating the working performance of the blade tip sensor.

The measuring signal of the blade tip sensor is amplified, eliminated and filtered correspondingly through a signal conditioning module of the blade tip sensor, and is converted into an electric signal to be transmitted into an electric parameter measuring module and a temperature measuring module for data reading; and finally, the data are sorted, compared and analyzed in the data processing module, the working performance of the blade tip sensor in the high-temperature environment is verified, and the working capacity of the blade tip sensor in the high-temperature environment is evaluated.

The present invention is not limited to the above-described embodiments. The foregoing description of the specific embodiments is intended to describe and illustrate the technical solutions of the present invention, and the above specific embodiments are merely illustrative and not restrictive. Those skilled in the art can make many changes and modifications to the invention without departing from the spirit and scope of the invention as defined in the appended claims.