Simulation of Supersonic Nozzle Flows with Plasma-based Control
Simulation of Supersonic Nozzle Flows with Plasma-based Control
复制标题
使用基于等离子体的控制模拟超音速喷嘴流动
DOI：
10.2514/6.2009-4187
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
D. Gaitonde
中科院分区：
文献类型：
--
作者：
D. Gaitonde
用唯象模型模拟了8个局域化弧丝等离子体激励器(LAFPA)对马赫数1.3喷管出口周边的控制效果。除了轴对称(m=0)模之外，在与Strouhal数0.33相对应的优选列模频率处分别引入扑动或第一混合(m=±1)和第二混合(m=±2)模。并对无控制和恒励磁两种情况进行了仿真。与在俄亥俄州立大学进行的计算前和计算后的实验流动可视化比较表明，模拟再现了执行器产生的主要效果。对瞬时量、平均量和位相平均量的详细分析表明，这是一个复杂的相干特征产生、演化和消散过程。当m=±1时，相平均流动呈现出连续的扭曲椭圆涡环，其轴线在拍动平面内，但在射流轴线的两侧交替。这产生了一个结构链，每个结构在主平面的一侧与其前身相互作用，而在另一侧与其后继者相互作用。通过自身和相互作用，每个环的前段被掐紧并穿过前一个环，然后迅速破裂，平均喷流呈椭圆形。M=±2模产生椭圆结构，其中连续环的主轴与两个相互垂直的对称平面对齐。在喷流中心线附近的较高速度和自感效应的可能影响下，短轴一侧比结构的其余部分向下游拉得更快，从剖面上看，产生了马蹄形。在消散过程中，平均喷流结构从一个“+”形的横截面演变成一个正方形，然后是一个大致圆形的轮廓。M=0模表现出相对稳定的卷起事件，编织区的涡肋连接着连续的大相干结构。恒定激励和无控制的情况是相似的。在混合方面，在所考察的模式中，它们=±1模式显示出中心线马赫数下降最快，其次是它们=±2模式。
A phenomenological model is employed to mimic the control effects of eight Localized Arc Filament Plasma Actuators (LAFPA) placed around the periphery of a Mach 1.3 nozzle exit. In addition to the axisymmetric (m = 0) mode, the flapping or first mixed (m = ±1) and second mixed (m = ±2) modes are separately introduced at the preferred column-mode frequency corresponding to a Strouhal number of 0.33. No-control and constant excitation cases are also simulated. Comparison with preand post-computation experimental flow visualizations performed at the Ohio State University indicate that the simulations reproduce the main effects generated by the actuators. Detailed analysis with instantaneous, averaged and phase-averaged quantities suggests a complex coherent feature generation, evolution and dissipation process. For m = ±1, the phase-averaged flow reveals successive distorted elliptic vortex rings with axes in the flapping plane, but alternating on either side of the jet axis. This generates a chain of structures where each interacts with its predecessor on one side of the major plane and its successor on the other. Through self and mutual interaction, the leading segment of each loop is pinched and passes through the previous ring before rapidly breaking up, and the mean jet flow takes on an elliptic shape. The m = ±2 mode yields elliptic structures with major axes of successive rings being aligned with the two symmetry planes, which are orthogonal to each other. The minor axis side is pulled downstream faster than the rest of the structure under the possible influence of the higher velocity near the jet centerline and self-induced effects, yielding a horse-shoe shape when viewed in profile. The mean jet structure evolves from a “+” shaped cross-section to a square and then roughly circular profile as it dissipates. The m = 0 mode exhibits relatively stable roll-up events, with vortex ribs in the braid regions connecting successive large coherent structures. The constant excitation and no-control cases are similar to each other. In terms of mixing, of the modes examined, them = ±1mode is confirmed to show the most rapid decline of centerline Mach number, followed by them = ±2 mode.
影响因子：
4.1
作者：
ROE, PL
通讯作者：
ROE, PL