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Study of non-plasma and plasma jets in transverse hypersonic cross flow

机译：横向高超声速横流中非等离子体和等离子体射流的研究

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Experiments involving a sonic round jet injected into high speed cross flow at Mach 5rnover a flat plate with a sharp leading edge were carried out. The effects of jet to freernstream momentum flux ratio, (J) incoming unit Reynolds number, and the type ofrninjectant gas on three dimensional jet interaction dynamics were examined. Thernboundary layer developing on the flat plate was laminar and two gases were injected,rnair and helium. As the momentum flux ratio is increased prominent curved flowrnstructures extent in spanwise direction as well as in upstream and downstreamrndirections, the amplitude of non-dimensional pressure values associated with the flowrnstructures rises. Jet interaction flow field can not be oversimplified and representedrnwith only one parameter that is jet to free stream momentum flux ratio, J; type ofrninjectant gas plays a role through specific heat ratio, γ, especially on downstream flowrnstructures and jet spreading in spanwise direction. On the other hand incomingrnReynolds number is clearly affecting boundary layer separation at upstream of the jet.rnJet penetration is found to be a non linear function of J and the separation locationrnextends upstream about five times the penetration height. Additionally PIVrnexperiments investigating the effect of localised arc filament plasma actuators placedrninside converging nozzle insert that is discharging into ambient were carried out. Therntungsten electrodes were housed inside a groove to sustain stable plasma actuation.rnForcing the jet at around preferred frequency (20kHz) at m = ±1 mode resultsrnspreading in radial direction and deceleration in the jet core in the farfield of jetrnplume.
机译：进行了将声波圆形射流注入马赫数为5的高速错流的实验，该板具有锋利的前缘。研究了射流与自由流动​​量通量比，（J）传入单位雷诺数和射流气体类型对三维射流相互作用动力学的影响。在平板上形成的边界层是层流的，注入了两种气体，即空气和氦气。随着动量通量比的增加，突出的弯曲流动结构在翼展方向以及上游和下游方向上延伸，与流动结构相关的无量纲压力值的振幅增加。射流相互作用流场不能过分简化和仅用射流与自由流动​​量通量比J的一个参数来表示。喷射气体的类型通过比热比γ发挥作用，尤其是在下游流动结构和射流沿展向方向扩展时。另一方面，进入的雷诺数显然影响射流上游的边界层分离。发现喷射穿透是J的非线性函数，分离位置在上游延伸约穿透高度的五倍。另外，进行了PIV试验，研究了局部电弧丝等离子体致动器的效果，该致动器放置在向环境中排放的会聚喷嘴嵌件的内侧。钨电极被放置在凹槽内，以维持稳定的等离子驱动。rn在喷射强度为m =±1的模式下以最佳频率（20kHz）强制射流会导致径向扩散，并在射流远距离的射流芯中减速。

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