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首页> 外文期刊>Journal of Vibration and Acoustics >Operational Control of Mixing Enhancement and Far-Field Jet Noise Suppression Using Downstream Fluidic Injection
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Operational Control of Mixing Enhancement and Far-Field Jet Noise Suppression Using Downstream Fluidic Injection

机译：使用下游流体注入的混合增强和远场射流噪声抑制的操作控制

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摘要

A novel fluid injection scheme is analyzed for its ability to suppress the far-field jet noise using multiple radial microjets placed downstream from the nozzle exhaust. Contrary to other previous research studies, which injected fluid either inside the nozzle or just at the nozzle exhaust, this injection scheme uses a coaxial injector tube to inject multiple equally spaced microjets perpendicular to the jet axis at an axial location downstream from the nozzle exhaust. Microjet injection closer to the jet axis leads to the formation of a counter rotating vortex pair (CVP) close to the injection location which subsequently breaks down into streamwise vortices as the microjet bends and follows the flow direction. Microjet injection pressure and angle of injection play a crucial role in determining the jet trajectory, penetration, and the strength of the CVP formed. The effect of these parameters on the far-field acoustic radiation is evaluated in this study. Detailed large eddy simulations are performed for a nozzle-injector setup operating at Mach 0.9 jet with Reynolds number ≈10~6 to help understand the aerodynamic and acoustic features of the interaction of this fluid injection scheme with the main jet.
机译：分析了一种新颖的流体喷射方案，该方案使用位于喷嘴排气口下游的多个径向微喷射器抑制远场喷射噪声的能力。与以前的其他研究相反，后者将流体注入到喷嘴内部或仅在喷嘴排气口处注入，该注入方案使用同轴注入管在喷嘴排气口下游的轴向位置垂直于射流轴注入多个等间隔的微射流。靠近喷射轴的微喷射喷射导致在喷射位置附近形成反向旋转涡流对（CVP），随后随着微喷射器弯曲并顺着流动方向分解成沿流的涡流。 Microjet喷射压力和喷射角度在确定喷射轨迹，穿透力和形成的CVP的强度方面起着至关重要的作用。在这项研究中评估了这些参数对远场声辐射的影响。对以雷诺数≈10〜6的马赫数0.9射流工作的喷嘴-喷射器装置进行了详细的大涡模拟，以帮助了解该射流方案与主射流相互作用的空气动力学和声学特征。

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