脉冲式燃烧风洞起动特性数值研究

Numerical study on the starting characteristics of the pulse combustion wind tunnel

1.
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China
2.
China Aerodynamics Research and Development Center, Mianyang 621000, China

摘要: 利用计算流体力学软件Fluent,采用隐式双时间步方法模拟非定常过程,控制方程的离散采用二阶迎风格式,湍流模型选择剪切应力输运(SST)k-ω模型,并求解组分扩散方程,对脉冲式燃烧风洞的起动过程进行了数值模拟,分析了喷管起动时流场结构的变化情况和自由射流区超声速流场的建立过程.计算结果为改进风洞起动特性提供了一定的参考依据.
- 脉冲式燃烧风洞 /
- 起动过程 /
- 数值模拟 /
- 喷管 /
- 扩压器
Abstract: The starting process of the pulse combustion wind tunnel is unsteady and very complex.It couldn't be investigated by use of the experimental method in existence.In this paper,the starting process was simulated by the Fluent computational fluid dynamics(CFD) code.The current version of this code employs dual-time formulation,second order upwind interpolation scheme,shear stress transport(SST) k-ω turbulence model,and species transport equation.The transient flow structure during nozzle starting process and the establishing process of supersonic flow in the free jet region were analyzed.The results provide a reference for the improvement of the starting characteristics of the pulse combustion wind tunnel.
- pulse combustion wind tunnel /
- starting process /
- numerical simulation /
- nozzle /
- diffuser

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