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A typical combustion chamber model is established to study the thermal-acoustic-structural performance of Aeroengine Combustor. Fluid and structure interaction (FSI) technology is used to simulate the ignition process of combustion chamber with different air-fuel ratio and vibration of combustion chamber. The calculated data is exchanged between fluid and solid interface by two-way coupled FSI. The results show that by varying the air-fuel ratio from 0.6 to 1.4, the average temperature and acoustic pressure are increased by 15% and 64.8%, respectively. The stress waves of the combustion chamber are consisted with three main frequencies of waves, which are one, two, and three doubling frequency, respectively. The studied structural vibrations are mainly caused by the one and three doubling frequency. The structural deformation caused by acoustic pressure accounts for 3.3%-4.9% larger than that of thermal expansion. INTRODUCTION A combustion is an important component of aircraft engine, which is used to provide a space for fuel to burn and convert into mechanical energy in turbo machineries. Unsteady burning of in the combustion usually causes fluctuations in temperature and pressure, and lead to structural fatigue damages. It’s important to study the internal gas field and structural performances of the combustion chamber, to give a helpful analysing of fatigue failure mechanism of combustion chambers. At present, lots of studies have been carried out to show the influence of flame model on combustion acoustics field and structure vibration characteristics. Sattelma [1] studied the gas field of a swirl stabilized premixed burner in an annular and a single burner combustion chamber, the effect of different gas field on combustion heat release rate was analysed. Prakash [2] studied the dynamic performances of chamber flame at different gas equivalent ratios, and the interaction between acoustic pressure and flame was analysed. Artur [3] analysed the heat-acoustic instability, and the interaction between temperature field and acoustic pressure field was studied. Huls [4] studied the vibration in combustion chambers basing on acoustic-elastic finite element model and sound vibration test. Shu [5-6] carried out the combustion chamber pressure wave under a single point and excitation conditions by applying visual high-speed photography technology. Most of the studies focus on the interaction between air and structural fields. However, the acoustic field and structural vibration are all strongly affected by the temperature field, the study without temperature is one-sided. A simulation modal of both combustion chamber and gas field is established to study the effect of temperature filed on the gas acoustic and structural vibration. The aim of this paper is to show the combined effect of thermoacoustic load on the wall of combustion chamber. The sound wave transmission process is simulated by CFD method. The vibration equation of plane noise is derived and solved to verify the accuracy of CFD method. Under different air-fuel conditions, the acoustic pressure, fluctuation, and combustion chamber vibration are all simulated to analyse the influence of gas acoustic on vibration of the combustion chamber. The results of the simulation is to provide a reference to the design of aero-engine combustors. 1 NUMERICAL ANALYSIS METHOD 1.1 Numerical simulation process In the physical process of the combustion, the heat transfer speed of the temperature in solid field is much lower than that of gas. Therefore, the steady state temperature results are used as initial conditions of chamber domain. The adiabatic condition is used in the numerical simulation process. Transient structural analysis of ANSYS software is

Study on Thermal-acoustic-structural Performance of Aeroengine Combustor Based on Coupled-Field Technology