Control of natural laminar instability waves on an axisymmetric body
Control of natural laminar instability waves on an axisymmetric body
复制标题
轴对称体上自然层流不稳定波的控制
DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
D. Ladd
中科院分区：
文献类型：
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作者：
D. Ladd
摘要：在 NOSC 高速水洞中进行了轴对称体自然层流失稳波控制的实验研究。本体是一个9:1的旋转椭球体，中部直径50毫米。控制扰动通过距机头 130mm 处宽度为 0.075mm 的抽吸/吹气槽引入边界层。槽前后的热膜传感器用于测量不稳定波的通过和衰减。使用非常简单的反转和延迟控制环路来控制嵌入吸/吹槽中的扬声器。在自由流速度为 8.67m/sec 时，控制后不稳定波的 RMS 波动减少了约 50%。在此速度下，不稳定波的频率约为 1kHz。实验运行条件对应于槽位置处的雷诺数，基于轴向位置和边界层位移厚度分别为124万和1520。鱼雷系统、子系统、组件、螺旋桨。
Abstract : An experimental investigation of the control of natural laminar instability waves on an axisymmetric body was conducted in the NOSC high speed water tunnel. The body was a 9:1 ellipsoid of revolution, 50mm in diameter at the midsection. Control perturbations were introduced into the boundary layer through a suction/blowing slot of 0.075mm width at 130mm from the nose. Hot film sensors before and after the slot were used to measure the passage and attenuation of the instability waves. A very simple invert and delay control loop was used to control a speaker embedded in the suction/blowing slot. At a freestream velocity of 8.67m/sec, and approximately 50 percent reduction in the RMS fluctuations of the instability waves was achieved after control. At this velocity the frequency of the instability waves was about 1kHz. The experimental run conditions corresponded to Reynolds numbers, at the slot location, of 1.24 million and 1520 based on axial location and boundary layer displacement thickness respectively. Torpedo systems, Subsystems, Components, Propellers.