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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Effects of the shear layer growth rate on the supersonic jet noise

机译:APS-000TH液体动力学的APS划分年会 - 事件 - 剪切层生长速率对超音速射流的影响

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Strong acoustic waves emitted from rocket plume might damage to rocket payloads because their payloads consist of fragile structure. Therefore, understanding and prediction of acoustic wave generation are of importance not only in science, but also in engineering. The present study makes experiments of a supersonic jet flow at the Mach number of 2.0 and investigates a relationship between growth rate of a shear layer and noise generation of the supersonic jet. We conducted particle image velocimetry (PIV) and acoustic measurements for three different shaped nozzles. These nozzles were employed to control the condition of a shear layer of the supersonic jet flow. We applied single-pixel ensemble correlation method (Westerweel et al., 2004) for the PIV images to obtain high-resolution averaged velocity profiles. This correlation method enabled us to obtain detailed data of the shear layer. For all cases, acoustic measurements clearly shows the noise source position at the end of a potential core of the jet. In the case where laminar to turbulent transition occurred in the shear layer, the sound pressure level increased by 4 dB at the maximum.
机译:从火箭羽流发出的强声波可能会损坏火箭有效载荷,因为它们的有效载荷由脆弱的结构组成。因此,声波产生的理解和预测不仅具有科学,而且在工程中具有重要性。本研究使MACH数为2.0的超音速喷射流程的实验,并研究了超声波射流的剪切层和噪声产生之间的关系。我们对三个不同形状喷嘴进行了粒子图像速度(PIV)和声学测量。使用这些喷嘴来控制超音速喷射流的剪切层的条件。我们应用了单像素集合相关方法(WesterWeel等,2004),用于PIV图像以获得高分辨率平均速度配置文件。该相关方法使我们能够获得剪切层的详细数据。对于所有情况,声学测量清楚地示出了喷射的潜在核心结束时的噪声源位置。在剪切层发生湍流转变的情况下,声压水平最大增加4dB。

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