摘要
针对液氧/煤油发动机试验台现有高模试验扩压器存在的局部焊缝开裂问题,基于燃气扩压器的热力耦合环境,采用雷诺平均方程和sst k-ε湍流模型,对扩压器内部的压力场、速度场和温度场进行分析,根据燃气冷却换热对扩压器内部温度梯度进行研究;用有限元法对扩压器冷却结构进行热应力分析,结合扩压器加工结构特点,确定局部焊缝开裂内外因根源;最后通过试验过程的扩压器应变测量,验证了该方法有效性,为解决扩压器焊缝开裂问题和现有扩压器改进设计提供了分析方法和理论指导。
For solving the part weld crazing problem of diffuser in high-altitude simulation test in a liquid oxygen/kerosene rocket engine, Reynolds mean equation and sst k-ε turbulence model were used to analyze the inner temperature field, pressure field and velocity field in the diffuser under the thermal mechanical coupling environment of diffuser. The inner temperature gradient of the diffuser was researched according to the gas cooling and heat transfer. A thermal stress analysis for the cooling structure of the diffuser is conducted with finite element method to confirm the internal and external cause of part weld crazing in consideration of the structural characteristics of the diffuser.The validity and accuracy of the method were proved by strain measurement of the diffuser in the process of a liquid oxygen/kerosene rocket engine test, which provided an analysis method and theoretical guidance for solving the weld crazing problem of the diffuser and modifying the design of the available diffuser
出处
《火箭推进》
CAS
2016年第1期71-76,共6页
Journal of Rocket Propulsion
关键词
扩压器
发动机试验
热力耦合
热应力分析
diffuser
engine test
thermal mechanical coupling
thermal stress analysis
