Numerical investigation of overexpanded nozzle flows
Numerical investigation of overexpanded nozzle flows
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DOI：
10.1007/s00193-013-0458-3
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发表时间：
2014
期刊：
影响因子：
2.2
通讯作者：
M. Sellam;G. Fournier;A. Chpoun;P. Reijasse
中科院分区：
文献类型：
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作者：
M. Sellam;G. Fournier;A. Chpoun;P. Reijasse
采用二维和三维reynolds -average Navier-Stokes数值模拟方法，对具有坡面不连续的平面过膨胀喷管内的流动进行了数值研究，并与实验结果进行了比较。喷嘴压力比（NPR）从1.6到10不等。实验结果与数值结果吻合较好，并观察到两种情况：在一定的临界NPR下，流动相对于喷管轴是不对称的，而在更高的NPR下，流动则是完全对称的。发现临界NPR的值与湍流模型有很大关系。最后，在喷嘴内增大或减小NPR时，发生流动形态变化的NPR是不同的，因此存在一种滞后现象。
The flow in a planar overexpanded nozzle with a slope discontinuity is studied numerically by means of two- (2D) and three-dimensional (3D) Reynolds-averaged Navier–Stokes simulations and is compared to experimental results. The nozzle pressure ratios (NPR) vary from 1.6 to 10. A good agreement is found between experimental and numerical results and two configurations are observed: under a certain critical NPR, the flow is shown to be asymmetrical with respect to the nozzle axis, while it is perfectly symmetrical for higher NPRs. The value of the critical NPR is found to be very dependent on the turbulence model. Finally, an hysteresis phenomenon is evidenced since the NPR at which the change of flow configuration occurs is different whether the NPR is increasing or decreasing in the nozzle.