轴对称喷管内外流场与结构温度场耦合计算

Coupled numerical study of flow field and heated structure for axisymmetric nozzles

关键词:  流动特性  温度场  流固耦合+  耦合传热+  数值仿真

Key words:  Flow characteristic  Temperature field  Coupled solid-fluid+  Coupled heat transfer+  Numerical simulation

摘要:

利用有限体积的对流项二次迎风插值格式和重整化群(RNG)k-ε湍流模型,二层增强型壁面函数,同时利用球形谐波法考虑热辐射的影响,以灰气体加权模型(WSGGM)确定气体介质的辐射性质,求解N-S方程、热传导方程、考虑吸收-发射性气体介质的辐射传输方程。采用流固耦合的流动与换热模型,流场与结构温度场互为边界条件交换数据,实现了流场解算与温度场解算的耦合数值分析。采用此计算模型对静止的轴对称收-扩喷管进行了数值模拟,计算得到的喷管壁温与试验数据吻合良好。在此基础上,进一步开展了巡航状态下轴对称收-扩喷管内外流场与结构温度场的耦合数值研究。

Abstract:

The QUICK and finite volume method,RNG k-ε turbulence model,enhanced wall functions,P1 radiation computation model and the weighted-sum-of-gray-gases model(WSGGM) are employed to solve N-S equation,thermal conduction equation and radiation transfer equation.To simulate fluid field and wall temperature distribution,numerical models have been developed considering both solid and fluid regions.The two parts work together.Each one provides a boundary condition for the other,and the solution of the coupled problem has been resolved.A hot air nozzle wall problem is simulated,and the computed results are validated with available experimental data.The calculated temperatures in the nozzle wall compare favorably with experimental data.Furthermore,the internal and external flow field and temperature distribution of a cruise nozzle are simulated.