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Experiments and numerical simulations on the mid-term evolution of hypersonic jets

机译：高超声速射流中期演变的实验和数值模拟

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The experiment described here is focussed to the observation of underexpanded, hypersonic turbulent jets. The experiment is relevant to a few aspects concerning the dynamics of astrophysical phenomena such as the Herbig-Haro jets and to the interaction between the large-scale vortices and the system of shocks that determine the spreading and entrainment properties of highly compressible free-flows. A number of orifice jets with a ratio between the stagnation pressure and the ambient pressure of the order 10(3) - 10(4) have been studied by changing the stagnation/ambient density ratio. This has been realized using dissimilar gases in the jet and in the ambient medium: by using He, Ar and air the stagnation/ambient density ratio can be changed by one order of magnitude while keeping fixed the pressure ratio. It has been possible to visualize the near and mid-term evolution of the jets and measure the axial and transversal density distributions. A comparison relevant to the shock waves configuration in between the nozzle exit and the first Mach's disk is shown for an air in air laboratory jet and its numerical simulation.
机译：这里描述的实验着重于观察膨胀不足的高超声速湍流射流。该实验与涉及天体现象动力学（例如Herbig-Haro射流）的几个方面以及大规模旋涡与确定高压缩自由流的扩散和夹带特性的激波系统之间的相互作用有关。通过改变停滞/环境密度比，研究了许多停滞压力与环境压力之比为10（3）-10（4）的孔口射流。这是通过在射流和周围介质中使用不同的气体来实现的：通过使用He，Ar和空气，停滞/环境密度比可以改变一个数量级，同时保持固定的压力比。可以看到喷流的近期和中期演变，并测量轴向和横向密度分布。显示了与喷嘴出口和第一马赫盘之间的冲击波配置有关的比较，用于空气实验室空气射流及其数值模拟。

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