环管型燃烧室火焰筒热弹塑性应力应变分析

Thermal elastic-plastic stress-strain analysis of can-annular combustor flame tube

针对环管型燃烧室火焰筒主燃孔裂纹和联焰管变形裂纹等故障,通过数值方法对火焰筒进行了稳态结构静力学计算。利用直接法获取了火焰筒温度场分布,并综合考虑材料的热弹塑性和火焰筒的复杂多孔结构对火焰筒进行了热应力应变分析,发现两侧联焰管根部下沿以及3、4、8、9号主燃孔附近气膜挡板边沿产生热应力集中,同时出现了塑性应变和大范围弹性应变,与实际火焰筒故障较吻合,验证了利用直接法获取的火焰筒温度场有利于获得较准确的火焰筒热应力应变分布的结论。

The steady static structural analysis of flame tube is carried out with the numerical method,since the primary holes and the flame crossover tubes are often cracked.The thermal stress-strain of the can-annular combustor flame tube is analyzed through the temperature field of flame tube obtained by the direct method,while the material thermal elastic-plastic properties and the complex structure of the flame tube are taken into account.The results show that the stress concentrates on the root of the flame crossover tube and the edge of cooling film baffles close to primary number 3,4,8and 9and the plastic strain and large-scale elastic strain occurs,which coincide with the failures of flame tube.Therefore,the temperature field of flame tube obtained by using the direct method proves to be useful for analyzing the thermal stress-strain accurately.