Parameters Governing Separation Control with Sweeping Jet Actuators
Parameters Governing Separation Control with Sweeping Jet Actuators
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DOI：
10.2514/6.2011-3172
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发表时间：
2011-06
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通讯作者：
R. Woszidlo
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文献类型：
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作者：
R. Woszidlo
在一种通用的“多襟翼翼型”（MFA）上对后掠射流作动器控制分离的参数进行了实验研究。无论是流量，也不是动量输入被发现是一个唯一的参数管理的电梯相邻致动器之间的距离变化。然而，质量流量系数和动量系数的平方根的乘积将升力压缩到一条曲线上，而与致动器间距无关。襟翼上的表面流动显示表明，由相邻射流的相互作用引起的反向旋转的流向涡对的形成。附着气流所需的致动强度随着离襟翼肩部的距离的增加和襟翼偏转的增加而增加。在试验范围内，理想激励位置与襟翼偏转、迎角或激励强度没有明显的关系。实验和数值计算结果之间的比较表明，在其铰链的最后皮瓣段的厚度有很强的依赖性。在没有这种几何效应的情况下，位流解似乎是可获得升力的一个合适的预测值。襟翼尺寸影响可获得的升力、伴随的阻力、所需的襟翼偏转和致动强度。通过控制分离，即使在考虑最大适用迎角的安全裕度时，可获得的升力系数范围也增加了一倍，而不会对阻力造成明显的损失。
Parameters governing separation control by sweeping jet actuators are investigated experimentally on a generic “Multiple Flap Airfoil” (MFA). Neither the flow rate nor the momentum input is found to be a sole parameter governing the lift for varying distance between adjacent actuators. However, the product of the mass flow coefficient and a square root of the momentum coefficient collapses the lift onto a single curve regardless of the actuator spacing. Surface flow visualization on the flap suggests the formation of counterrotating pairs of streamwise vortices caused by the interaction of neighboring jets. The actuation intensity required to attach the flow increases with increasing distance from the flap shoulder and increasing flap deflection. No obvious dependence of the ideal actuation location on flap deflection, angle of attack, or actuation intensity is found within the tested range. Comparisons between experimental and numerical results reveal a strong dependence on the thickness of the last flap segment at its hinge. In absence of this geometrical effect potential flow solution appears to be a suitable predictor for the obtainable lift. The flap size affects the achievable lift, the accompanying drag, the required flap deflection, and actuation intensity. By controlling separation the range of achievable lift coefficients is doubled without significant penalty in drag even when considering a safety margin for the maximum applicable incidence.