A Certain Type Of Engine Flame Tube Is Non-uniform Temperature Field Under Thermal Stress Analysis

The combustor of gas turbine engine operates under inhomogeneous high temperature, which causes very complicated mechanical behavior of combustor's material, and makes combustor failure. In this thesis, in order to search the condition and reason of failure for a combustor, thermal stress was analyzed in steady and transient temperature field.According to the investigation, three conclusions are obtained.1. The combustor don't fail if transient rise of temperature field is neglected, the stress field of combustor cann't cause gas film wall rupture.2. Combustor's creep and relaxation is calculated in steady temperature field, the results show that creep and relaxation is not main reason destroying combustor chamber.3. Transient thermal field and coupled thermal stress in engine start-up is especially analyzed in this thesis. If there are high temperature gradient between cool liner and hot liner, compressive plastic strain appear at that transient time, which lead to gas film wall bearing high tensile stress at high temperature. High tensile stress is one of main reasons which destroy combustor. On the contrary, if temperature gradient is relatively low, combustor only undergo low compressive stress at high temperature. The combustor of engine has a longer life length.These results can provide some reference for maintain and design for gas turbine combustor.