Unsteady gas flows and particle dynamics in the shock layer formed by the impingement of a supersonic two-phase jet onto a plate
Unsteady gas flows and particle dynamics in the shock layer formed by the impingement of a supersonic two-phase jet onto a plate
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超音速两相射流撞击板上形成的激波层中的不稳定气流和粒子动力学
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
K. Klinkov
中科院分区：
文献类型：
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作者：
K. Klinkov
研究了超声速含颗粒射流垂直撞击平板的问题。所研究的自由射流的特征在于马赫数为2.6-2.8，停滞温度为300-500 K。分散相由不同密度（2700-7900 kg/m3）和尺寸（10-100 μm）的固体颗粒组成。首先，研究了极细长轴对称喷管形成的射流参数。第二，采用一种新发展的多次曝光摄影方法，结合平板表面压力的同步测量，研究了射流与平板相互作用的非定常行为。三种类型的流动振荡的发现和研究的压力变化的频谱在激波层。特别注意的是集中在流场与再循环流。此外，颗粒的动力学被认为是在稳定和非稳定的流动，理论和实验。在不同的条件下，研究了板前粒子云的形成。最后，研究了颗粒与表面的相互作用。讨论了薄膜的形成和冲击致发光机理。
Supersonic particle-laden jets impinging normally on plates are studied. The free jet studied is characterized by Mach numbers of 2.6-2.8 and stagnation temperatures of 300-500 K. The dispersed phase consists of solid particles of different densities (2700-7900 kg/m3) and sizes (10-100 μm). First, the parameters of the jet formed by an extremely slender axisymmetric nozzle are examined. Second, unsteady behaviors of jet-plate interactions are studied by a newly developed method of multi-exposure photography, combined with a synchronized pressure measurement on the surface of the plate. Three types of flow oscillations are found and studied by spectrometry of pressure variations in the shock layer. Special attention is focused on flow fields with a recirculating flow. In addition, the dynamics of particles are considered in steady and unsteady flows, both theoretically and experimentally. The formation of a cloud of particles ahead of the plate is studied for different conditions. Finally, particle-surface interactions are studied. Coating formation and the mechanism of impact-induced luminescence are discussed.