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引用次数: 0
摘要
可压缩空气动力流的热动力湍流结构通常以熵与压力或温度的相关系数为特征。我们利用 dns 数据研究了可压缩湍流平面通道流中的熵波动 s' 及其与其他热力学变量波动的相关性。我们研究了 hcb(Huang-Coleman-Bradshaw)摩擦雷诺数(100⪅Reτ★⪅1000)和中心线马赫数(0.3⪅M¯CLx⪅2.5)对均方根 srms' 的大小和峰值位置的影响。计算了热力学基本变量(压力 p、密度 ρ 和温度 T)波动对 s'的完全序列展开,适用于热容可变 cp(T) 热力学的一般情况。研究了 s'与基本热力学变量(cs'p'、cs'ρ'、cs'T')波动的相关系数,以及变化的(Reτ★,M¯CLx)。通过考虑 s' 的概率密度函数 (pdf) 及其与其他热力学变量的联合 pdf,可以深入了解这些相关性。
Entropy Fluctuations and Correlations in Compressible Turbulent Plane Channel Flow.
The thermodynamic turbulence structure of compressible aerodynamic flows is often characterised by the correlation coefficient of entropy with pressure or temperature. We study entropy fluctuations s' and their correlations with the fluctuations of the other thermodynamic variables in compressible turbulent plane channel flow using dns data. We investigate the influence of the hcb (Huang-Coleman-Bradshaw) friction Reynolds number (100⪅Reτ★⪅1000) and of the centreline Mach number (0.3⪅M¯CLx⪅2.5) on the magnitude and location of the peak of the root-mean-square srms'. The complete series expansions of s' with respect to the fluctuations of the basic thermodynamic variables (pressure p, density ρ and temperature T) are calculated for the general case of variable heat-capacity cp(T) thermodynamics. The correlation coefficients of s' with the fluctuations of the basic thermodynamic quantities (cs'p', cs'ρ', cs'T'), for varying (Reτ★,M¯CLx), are studied. Insight on these correlations is provided by considering the probability density function (pdf) of s' and its joint pdfs with the other thermodynamic variables.
期刊介绍:
Entropy (ISSN 1099-4300), an international and interdisciplinary journal of entropy and information studies, publishes reviews, regular research papers and short notes. Our aim is to encourage scientists to publish as much as possible their theoretical and experimental details. There is no restriction on the length of the papers. If there are computation and the experiment, the details must be provided so that the results can be reproduced.