Research On The Reconstruction Method Of Aeroengine Temperature Field Based On Ray Tracing Algorithm

Along with the development of the civil aviation transportation industry,the daily monitoring and maintenance of aircraft rises more and more attention.As engine is the most expensive and essential component of an aircraft,according to survey data from the civil aviation industry,engine failure is an important factor affecting various types of safety issues including accidents.By measuring and reconstructing the exhaust temperature field of an aeroengine,the engine state and potential safety hazards can be predicted by analyzing the temperature field.The subject "Research on aero engine temperature field reconstruction method based on ray tracing algorithm" aims to study a method of aero engine temperature field reconstruction using ray tracing algorithm to match the measurement of aero engine exhaust temperature field environment by using visual measurement technology for reconstruction.Based on this demand,the main research contents of the paper include:1.To deal with the image distortion caused by the principle of visual measurement,which applied to high temperature gradient environments,this paper studies both the abstraction of light emitted from space points as rays,and studies the ray tracing algorithm of optical system imaging by modifying the propagation path of rays.Moreover,the Runge-Kutta method is used to solve the algorithm.Finally,the algorithm is used to correct the image distortion,and the actual error obtained by the corner detection method is compared and verified.The experimental result shows that the method of correcting the distorted image caused by the heat source interference using the ray tracing algorithm is feasible,the error compensation for the image distortion is realized,and the accurate corrected image can be obtained.2.In terms of temperature field reconstruction,the traditional background schlieren method is a very practical non-contact optical measurement method.However,due to the strong light and high temperature interference,the accuracy of reconstructing the temperature field reconstructed by the traditional background schlieren method is relatively low.To solve these problems,this paper proposes a method of reconstructing a three-dimensional temperature field by using a colored background method.Firstly,the traditional background schlieren method is used to reconstruct a non-uniform three-dimensional temperature field.Secondly,the aero engine exhaust temperature field was reconstructed by the colored background schlieren method.By analyzing the correlation coefficients between different colored points of the colored background pattern,the non-uniform gradient high-temperature temperature field can be reconstructed more accurately.Finally,the Runge-Kutta ray tracing method and thermocouple contact measurement method were used to verify the experimental results.By comparing these results,it is shown that the application of the colored background schlieren method can achieve accurate three-dimensional reconstruction of the temperature field and effectively improve the accuracy of the traditional background schlieren method.3.In the aero-engine temperature field reconstruction,a computer simulation algorithm was first used to reconstruct the aero-engine temperature field,and the simulation results were corrected by measuring the aero-engine boundary conditions.Then the colored background schlieren method was used to experiment and reconstruct the aero-engine temperature field.Finally,the method of thermocouple point measurement was used to verify the reconstructed temperature field.The verification of the results shows that the colored background schlieren method can be used to reconstruct the aero-engine exhaust temperature field.