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首页> 外文期刊>International journal of hypersonics >Experimental and Numerical Investigation of a Non-Axisymmetric Strut Based Ejector
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Experimental and Numerical Investigation of a Non-Axisymmetric Strut Based Ejector

机译：基于非轴对称支撑的喷射器的实验和数值研究

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Tests were performed in a non-axisymmetric, single nozzle, strut-based ejector to investigate mass flow entrainment, choking mechanisms and stream mixing as a function of primary (strut nozzle) to secondary (duct inlet) flow stagnation pressure ratio. Experimental results show a mass flow choke in the mixing duct rather than a traditional aerodynamic choke in the strut gap. The stream mixing length was constant for lower primary flow pressures, whereas mixing length varied with pressure at higher values. A companion numerical study was performed using Reynolds Averaged Navier-Stokes solutions to investigate several turbulence models. Based on both 2-D and 3-D simulation results, compressibility correction to conventional incompressible two-equation models was required for capturing the supersonic ejector mixing phenomena. The Baldwin-Lomax and the SST two-equation models were capable of capturing the essential flow features. Even with compressibility correction, the k-ε model could not reproduce wall-dominated phenomena such as mixing duct pressure recovery.
机译：测试是在非轴对称，单喷嘴，基于支撑杆的喷射器中进行的，以研究随着主（支撑喷嘴）与次要（进气道入口）流量停滞压力比变化而引起的质量流夹带，阻塞机制和流混合。实验结果表明，混合流道中存在质量流节流阀，而不是撑杆间隙中的传统空气动力学节流阀。对于较低的主流动压力，流混合长度是恒定的，而在较高的值下，混合长度随压力而变化。使用雷诺平均Navier-Stokes解决方案进行了伴随数值研究，以研究几种湍流模型。基于2-D和3-D仿真结果，需要对常规不可压缩的两方程模型进行压缩性校正才能捕获超音速喷射器的混合现象。 Baldwin-Lomax和SST两方程模型能够捕获基本流量特征。即使进行可压缩性校正，k-ε模型也无法重现壁主导的现象，例如混合管道压力恢复。

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