Numerical Simulation Study On Structural Characteristics Of Aeroengine Open-air Test Bench

The aero-engine open-air test bed is an indispensable part of the whole aero-engine test supporting system.Because the test environment is open-air,it is impossible to avoid the influence of wind,sun and other environmental factors on the test results,so it is unable to provide support for the calibration of the indoor test bench.This paper calculates and analyzes the influence of some environmental factors on the open-air test bench in the test process,which has important theoretical significance and application value for the open-air test-bed technology.In this paper,the influence of environment on the dynamic characteristics of aero-engine test bench is systematically analyzed by means of simulation calculation,numerical analysis and interdisciplinary theory.The static deformation of the platform without environmental factors is calculated and compared with the test data,and the deformation law of different structures under load is analyzed.The finite element model of the influence of solar radiation on the overall aero-engine open-air test-bed was established by using FLUENT software.The influence law of solar radiation on the thermal deformation caused by the temperature change of the test bench was analyzed.The derivation formula of solar radiation suitable for the thermodynamic calculation of the test bench was verified by ASHRAE model.The heat generated in the model was verified by linear expansion coefficient Under the condition of deformation,the change relationship of thermal deformation caused by different structure of the test bench;the calculation method of solar radiation model based on FLUENT is given to effectively simulate the environment of open-air test-bed.In addition,the relationship between the windward area and the wind direction angle of the open-air test bench is calculated,which provides the calculation basis for the subsequent wind load influence.The results show that the radiation temperature conditions generated by solar radiation can be calculated by solar calculator,which makes the structure produce temperature gradient change;based on ANSYS Compared with the traditional test results comparison method,the linear expansion coefficient method is more efficient in numerical comparison and more in line with the test requirements of the open-air test bed.