Broad band shock associated noise predictions in axisymmetric and asymmetric jets using an improved turbulence scale model
Broad band shock associated noise predictions in axisymmetric and asymmetric jets using an improved turbulence scale model
复制标题
使用改进的湍流尺度模型对轴对称和非对称射流中的宽带冲击相关噪声进行预测
DOI：
10.1016/j.jsv.2017.01.027
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发表时间：
2017
影响因子：
4.7
通讯作者：
Kalyan A
中科院分区：
文献类型：
--
作者：
Kalyan A
非设计工况下的超声速射流在其远场频谱中有三个不同的区域：混合噪声、尖叫噪声和宽带激波相关噪声（BBSAN）。BBSAN通过突出的多个峰而明显。莫里斯和米勒BBSAN模型是基于声学类比，提供了一个简单的实现RANS，形成了本工作的基础。模拟模型鲁棒地捕获峰值频率噪声，该噪声发生在基于喷嘴出口直径的约为1的Strouhal数附近，但导致在较高频率的预测下的主要声音。在喷流混合噪声文献中，已经表明，将频率依赖性纳入有效噪声源的特征长度和时间尺度中改进了远场噪声预测。在本文中，原始的Morris和米勒模型的几个修改被认为是将频率相关的尺度，建议在射流混合噪声文献。除此之外，提出了一种新的混合尺度模型，该模型结合了依赖于平均流速梯度和基于湍流动能耗散的标准混合噪声型缩放的相关尺度。与原始Morris和米勒模型相比，混合尺度模型在基准轴对称收敛-发散和收敛喷流的噪声预测方面显示出相当大的改进。进一步的验证，新的模型已被应用于各种偏心率的椭圆射流的改进预测。研究表明，对于相同的推力条件，与基线轴对称射流相比，椭圆形喷嘴可以降低源处的噪音。
Supersonic jets that are subject to off-design operating conditions are marked by three distinct regions in their far-field spectra: mixing noise, screech and Broadband Shock Associated Noise (BBSAN). BBSAN is conspicuous by the prominent multiple peaks. The Morris and Miller BBSAN model that is based on an acoustic analogy, offering a straightforward implementation for RANS, forms the foundation of the present work. The analogy model robustly captures the peak frequency noise, that occurs near Strouhal number of about 1, based on the nozzle exit diameter but leads to major sound under prediction for higher frequencies. In the jet mixing noise literature, it has been shown that an inclusion of frequency dependence into the characteristic length and temporal scales of the effective noise sources improves the far-field noise predictions. In the present paper, several modifications of the original Morris and Miller model are considered that incorporate the frequency dependent scales as recommended in the jet mixing noise literature. In addition to these, a new mixed scale model is proposed that incorporates a correlation scale that depends both on the mean-flow velocity gradient and the standard mixing noise-type scaling based on the dissipation of turbulent kinetic energy. In comparison with the original Morris and Miller model, the mixed scale model shows considerable improvements in the noise predictions for the benchmark axisymmetric convergent-divergent and convergent jets. Further to this validation, the new model has been applied for improved predictions for elliptic jets of various eccentricity. It has been shown that, for the same thrust conditions, the elliptical nozzles lead to noise reduction at the source in comparison with the baseline axisymmetric jets.
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影响因子：
4.7
作者：
C. Tam
通讯作者：
C. Tam
根据 CFD 数据预测喷射噪声
DOI：
--
发表时间：
2004
期刊：
影响因子：
--
作者：
P. Morris;S. Boluriaan
通讯作者：
S. Boluriaan
针对同轴射流噪声的 CFD 耦合声学方法
DOI：
--
发表时间：
2003
期刊：
影响因子：
--
作者：
G. Page;J. McGuirc;Mamdud Hossain;R. Self;A. Bassetti
通讯作者：
A. Bassetti
DOI：
--
发表时间：
1964
期刊：
影响因子：
--
作者：
H. Mirels
通讯作者：
H. Mirels
DOI：
10.2514/6.2009-3315
发表时间：
2009-05
期刊：
--
影响因子：
--
作者：
P. Morris;Steven A. E. Miller
通讯作者：
P. Morris;Steven A. E. Miller