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采用有限体积流固耦合计算方法、非线性有限元热结构耦合分析方法和局部应变法研究大面积比铣槽喷管三维再生冷却槽道在循环工作条件下的热结构变形与低周疲劳寿命,并对比分析了冷却剂质量流量与入口温度对铣槽喷管疲劳使用寿命的影响。计算结果表明,铣槽喷管热结构响应呈现复杂的三维效应,应变较大位置主要分布在与肋连接的内衬区域,喷管中部的残余应变量最大;冷却槽道低周疲劳寿命分布和热结构响应基本一致,最小寿命位于喷管中部与肋相连的内衬区域燃气侧;随冷却剂质量流量增加,铣槽喷管低周疲劳寿命不断提高;随冷却剂入口温度增加喷管尾部低周疲劳寿命值不断降低,而喷管中前部的低周疲劳寿命值却不断提高,当冷却剂入口温度为280K左右时,本文的铣槽喷管总体使用寿命达到最大。
The finite element method of fluid-structure interaction, coupled nonlinear finite element analysis of thermal structure and local strain method were used to study the thermal structural deformation and low-cycle fatigue life of large-area three-dimensional recirculation cooling channel of slotted slot nozzle under cyclic operating conditions. The influence of coolant mass flow rate and inlet temperature on fatigue life of slotted nozzle was analyzed. The calculation results show that the thermal structure response of the grooved nozzle shows a complex three-dimensional effect, and the location with large strain is mainly distributed in the lining area connected with the rib, with the largest amount of residual strain in the middle of the nozzle. The thermal structure response is basically the same, the minimum life is located on the gas side of lining area connected with rib in the middle of the nozzle. With the increase of coolant mass flow, the low cycle fatigue life of grooved nozzle increases continuously. The value of weekly fatigue life decreases continuously, but the value of low cycle fatigue life in the front part of the nozzle increases continuously. When the coolant inlet temperature is about 280K, the overall service life of the slotted nozzle in this paper reaches its maximum.