Noise Generation in the Near-Nozzle Region of a Chevron Nozzle Jet Flow
Noise Generation in the Near-Nozzle Region of a Chevron Nozzle Jet Flow
复制标题
V 形喷嘴射流近喷嘴区域的噪声产生
DOI：
10.2514/6.2007-3596
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
M. Hussaini
中科院分区：
文献类型：
--
作者：
A. Uzun;M. Hussaini
本文对人字形喷管中雷诺数冷射流近喷管区进行了数值模拟。在这项研究中，人字形喷管是由NASA格伦研究中心的研究人员实验研究的SMC 001喷管。这种喷嘴设计包含六个对称的V形，具有五度的穿透角。采用高精度、多块、大涡模拟（LES）方法，对人字形喷管内的流动和喷管外的自由射流进行了数值模拟。求解控制方程的网格点总数约为1亿个。模拟的主要重点是捕捉增强的剪切层混合，由于人字形和随之而来的噪声产生，发生在喷嘴出口下游的前几个直径内的射流的混合层。详细的计算方法，连同模拟结果的分析。模拟数据进行了比较，与现有的实验流场测量相同的喷嘴几何形状。并对边线方向的噪声谱与实验数据进行了比较。总体而言，他的模拟结果是非常令人鼓舞的，并证明了人字形喷嘴射流计算使用我们的模拟方法的可行性。
This paper reports on the simulation of the near-nozzle region of a moderate Reynolds number cold jet flow exhausting from a chevron nozzle. The chevron nozzle conside red in this study is the SMC001 nozzle experimentally studied by the researchers at the NASA Glenn Research Center. This nozzle design contains six symmetric chevrons that have a five-degree penetration angle . The flow inside the chevron nozzle and the free jet flow outside are computed simultaneously by a high-order a ccurate, multi-block, large eddy simulation (LES) code with overset grid capability. The total number of grid points at which the governing equations are solved is about 100 million. The main emphasis of the simulation is to capture the enhanced shear layer mixing due to the chevrons and the consequent noise generation that occurs in the mixing layers of the jet within the first few diameters downstream of the nozzle exit. Details of the co mputational methodology are presented together with an analysis of the simulation results. The simulation data are compared with available experimental flow field measurements for the same nozzle geometry. A co mparison of the noise spectrum in the sideline direction with experimental data is also carried out. Overall, t he simulation results are very encouraging and demonstrate the feasibility of chevron nozzle jet computations using our simulation methodology.