Research On Temperature Distribution Measurement At Aeroengine Combustion Chamber Exit Based On Acoustic Wave Sensor

As the aeroengine combustion chamber temperature distribution impact to working of engine safety and reliability, the studies have been long carried out in this area at home and abroad. But most of the measuring instruments are the main point of measurement. It discusses the methods of measuring the use of acoustic aeroengine combustion chamber temperature distribution method.First of all, measurement method of the aeroengine combustion chamber temperature distribution is studied at home and abroad, an analysis of these methods of advantages and disadvantages. Discussing the acoustic waves through the combustion region and the acoustic wave equation with the medium temperature, and research on acoustic measurement method aeroengine combustion chamber temperature of the basic principles.According to acoustic propagation in the flow characteristics, the aeroengine combustion chamber temperature and velocity of the mathematical model is established. Airflow through the analysis of the impact of the acoustic disturbance gived the conditions of application of mathematical models, which is as long as the speed of sound waves in the engine combustion chamber faster than air speed. It will be able to detect sound waves between the sensor flight time, and in accordance with the acoustic time-of-flight reconstruct of the combustion chamber temperature field.Secondly, detail reconstruction algorithms of aeroengine combustion chamber temperature field, analyzed the effects of temperature field of image reconstruction accuracy factor. The experimental results showed that the number of sensors and location distribution, combustion chamber temperature region division, combustion exit temperature field reconstruction accuracy having a certain impact.Finally, the design and implement of the combustion chamber temperature field simulation reconstruction systems, applications of the system of combustion chamber temperature field reconstruction algorithms, the impact of temperature field in the reconstruction of the factors analyzed by simulation. The simulation results show that the results of temperature field in the reconstruction of the greatest error to be 48℃, the average error to be 20.75℃, RMS error of 7.19 percent, indicating that the algorithm has a certain temperature field reconstruction capacity. At the same time, also shows that the number of sensors along with the increase in the combustion exit temperature field image quality markedly improved. Appropriate increase in the number of sensors can improve the combustion chamber temperature field reconstruction precision.