Effect of large-scale mixing on the axisymmetric structure of turbulence correlations in complex dual stream jets
Effect of large-scale mixing on the axisymmetric structure of turbulence correlations in complex dual stream jets
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复杂双流射流中大规模混合对湍流关联轴对称结构的影响
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
S. Karabasov
中科院分区：
文献类型：
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作者：
M. Afsar;V. Gryazev;A. Markesteijn;S. Karabasov
双流流动是民用航空中使用的涡轮风扇发动机的普遍特征。本文分析了在加热条件下，同轴高速圆射流中湍流关联的空间结构。特别是，我们考虑的第二秩相关张量和通常的四阶雷诺应力自协方差张量，进入Goldstein的广义声学类比公式的轴对称的效果。这些张量的不变量可以简化为一个更简单的形式，这取决于是否假设各向同性或轴对称。我们表明，轴对称湍流近似仍然准确的核心区域，但往往会打破在旁路流，特别是在两个流之间的界面区域，在那里发生高水平的湍流混合。在本文中，我们提出了一些我们的最新成果，并为我们计划的未来计算提供了一个路线图。
Dual-stream flows are a ubiquitous feature of turbofan engines used in civil aviation. In this paper we analyze the spatial structure of turbulence correlations in a high speed round coaxial jet operating at heated conditions. In particular we consider the effect of axisymmetry of a second rank correlation tensor and the usual fourth order Reynolds stress auto-covariance tensor that enters the Goldstein’s generalized acoustic analogy formulation. The invariants of these tensors can be reduced to a simpler form depending on whether isotropy or axisymmetry was assumed. We show that an axisymmetric turbulence approximation remains accurate in the core region but tends to break down in the bypass stream and especially in the interfacial region between both streams where high level of mixing of turbulence takes place. In the paper we present some of our latest results and provide a road map for the future calculations that we have planned.
基于Goldstein广义声学类比的温度效应双流射流噪声低阶模型
DOI：
10.2514/6.2019-2665
发表时间：
2019
期刊：
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影响因子：
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作者：
Gryazev V
通讯作者：
Gryazev V