温度梯度对温度脉动空间关联的影响
The Effect of Temperature Gradient on the Correlation of Temperature Fluctuations
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摘要: 本文给出有温度梯度时,温度脉动的空间关联函数的实验结果.同时也给出没有温度梯度时的结果.这些结果很好地表明了当没有温度梯度时,温度脉动场是各向同性的;而当有温度梯度存在时,温度脉动场具有明显的各向异性.温度脉动场沿温度梯度β方向的空间关联函数明显地大于垂直于β方向的关联.另外实验结果与D.W.Dunn和W.H.Rcid的理论结果一致.Abstract: In this paper we present the experintent results of the space corrclations of temperature fluctuations when there is and is not temperature gradient.From those results we can see clearly that the temperature fluctuation field is isotropic without temperature gradint,and it is obviously anisotropic with temperature gradient.The temperature correlation along the gradient direction β is obviously larger than the vertical to β direction. Our experiment results agree with the theory results of D. W. Dunn and W. H. Reid[1].
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[1] Dunn,D,W.andw.H.R eid.Heat transfer in isotropic turbulence during the final period of decay,NACA TN-4186(1958). [2] La Rue.,John C,and R.,A.Libby,Thermul mixing layer downstream of half-heated turbulent grid,Phys,Fluids,24,4(1981)597 603. [3] Sirivat,A.and L,Warhaft,The effect of a passive cross-stream temperature gradiem on the evolution of temperature variance and heat flux in grid turbulence,J.Fluid Mech.,128(1983)323-346, [4] Warhaft,Z.,An experiment study of cffcet of uniform otrain on therrnal fluctuation in grid-generated turbulence,J,Fluit Mech.,99,3(1980)545-573. -
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