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本文通过实验研究雷诺数对加热圆柱尾流中温度场的影响. 实验中雷诺数 Re(≡ U∞d/ν, 其中U∞为来流速度、d为圆柱直径、ν 为流体黏度)的取值范围为1200–8600. 实验中温度是由直径为0.63 μm的冷线探针测量的. 实验结果表明, 一般而言, 雷诺数对整个尾流的标量混合特性有着显著的影响. 随着雷诺数的增加, 平均标量场向外的扩散速度加快、标量脉动强度增加了但衰减也加快. 本文还发现: 尾流中似乎存在两个区域, 一个位于卡门涡街下游靠后, 另一个就是传统的远场自相似区; 在这两个区域, 某些描述标量和动量的相似关系式近似成立.The effect of Reynolds number on a passive scalar field is investigated in the turbulent wake of a circular cylinder. The cylinder-diameter-based Reynolds number varies between 1200 and 8600. The temperature difference above the ambient temperature acts as a passive scalar quantity. In general, the Reynolds number is found to have significant influence on the scalar mixing characteristics in the wake flow. When Reynolds number increases, the mean scalar spreads out more rapidly and the scalar variance decays with downstream distance at a higher rate. It is also revealed that if is likely to have two regions where some relations for self-similarity are approximately valid, one is located in the late Karman vortex street and the other is the traditional self-preserving far-wake.
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Keywords:
- turbulent wake /
- passive scalar /
- Karman-vortex street /
- mixing characteristics
[1] Townsend A 1949 Australian J. Sci. Res. 2A 451
[2] Roshko A 1961 J. Fluid Mech. 10 345
[3] Fabris G 1979 Part 1. J. Fluid Mech. 94 673
[4] Cantwell B, Coles D 1983 J. Fluid Mech. 136 321
[5] Wygnanski I, Champagne F, Marasli B 1986 J. Fluid Mech. 168 31
[6] Antonia R A, Browne L W B 1986 J. Fluid Mech. 163 393
[7] Cimbala J M, Nagib H M, Roshko A 1988 J. Fluid Mech. 190 265
[8] Mi J, Antonia R A 1996 Expts. Fluids 20 383
[9] Kiya M, Matsumura M 1985 Bull. JSME 28 2617
[10] Tritton D J 1988 Physical Fluid Dynamics 2nd edition (Oxford University Press)
[11] Antonia R A, Browne L W B, Bisset D K, Fulachier L 1987 J. Fluid Mech. 184 423
[12] Townsend A A 1979 The Structure of Turbulent Shear Flow. (Cambridge University Press)
[13] Gerrard J H 1965 J. Fluid Mech. 22 187
[14] Lin J C, Towfighi J, Rockwell D 1995 J. Fluids & Struct. 9 409
[15] Roshko A, Fiszdon W 1969 Problems of Hydrodynamics and Continuum Mechanics 606-616. S.I.A.M.
[16] Zhou Y, Antonia R A, Tsang W K 1998 Expts. Fluids 25 118
[17] Namer I, Ötgen M V 1988 Expts. Fluids 6 387
[18] Freymuth P, Uberoi M S 1971 Phys. Fluids 14 2574
[19] Mi J, Antonia R A 1995 Turbulent Shear Flows 9 (eds. F. Durst, B.E. Launder, F. W. Schmidt and J. H. Whitelaw), Berlin, Springer, pp.165-185
[20] Williamson C H K 1996 Ann. Rev Fluid Mech. 28 477
[21] Paranthoen P, Petit C, Lecordier J C 1982 J. Fluid Mech. 124 457
[22] Rehab H, Antonia R A, Djenidi L 2001 Expts. Fluids 31 186
[23] Hayakawa M, Hussain A K M F 1989 J. Fluid Mech. 206 375
[24] Balachandar R, Chu V H, Zhang J 1997 J. Fluid Eng. 119 263
[25] Tennekes H, Lumley J L 1972 A First Course in Turbulence (The MIT Press)
[26] Sreenivasan K R 1981 Phys. Fluids 24 1232
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[1] Townsend A 1949 Australian J. Sci. Res. 2A 451
[2] Roshko A 1961 J. Fluid Mech. 10 345
[3] Fabris G 1979 Part 1. J. Fluid Mech. 94 673
[4] Cantwell B, Coles D 1983 J. Fluid Mech. 136 321
[5] Wygnanski I, Champagne F, Marasli B 1986 J. Fluid Mech. 168 31
[6] Antonia R A, Browne L W B 1986 J. Fluid Mech. 163 393
[7] Cimbala J M, Nagib H M, Roshko A 1988 J. Fluid Mech. 190 265
[8] Mi J, Antonia R A 1996 Expts. Fluids 20 383
[9] Kiya M, Matsumura M 1985 Bull. JSME 28 2617
[10] Tritton D J 1988 Physical Fluid Dynamics 2nd edition (Oxford University Press)
[11] Antonia R A, Browne L W B, Bisset D K, Fulachier L 1987 J. Fluid Mech. 184 423
[12] Townsend A A 1979 The Structure of Turbulent Shear Flow. (Cambridge University Press)
[13] Gerrard J H 1965 J. Fluid Mech. 22 187
[14] Lin J C, Towfighi J, Rockwell D 1995 J. Fluids & Struct. 9 409
[15] Roshko A, Fiszdon W 1969 Problems of Hydrodynamics and Continuum Mechanics 606-616. S.I.A.M.
[16] Zhou Y, Antonia R A, Tsang W K 1998 Expts. Fluids 25 118
[17] Namer I, Ötgen M V 1988 Expts. Fluids 6 387
[18] Freymuth P, Uberoi M S 1971 Phys. Fluids 14 2574
[19] Mi J, Antonia R A 1995 Turbulent Shear Flows 9 (eds. F. Durst, B.E. Launder, F. W. Schmidt and J. H. Whitelaw), Berlin, Springer, pp.165-185
[20] Williamson C H K 1996 Ann. Rev Fluid Mech. 28 477
[21] Paranthoen P, Petit C, Lecordier J C 1982 J. Fluid Mech. 124 457
[22] Rehab H, Antonia R A, Djenidi L 2001 Expts. Fluids 31 186
[23] Hayakawa M, Hussain A K M F 1989 J. Fluid Mech. 206 375
[24] Balachandar R, Chu V H, Zhang J 1997 J. Fluid Eng. 119 263
[25] Tennekes H, Lumley J L 1972 A First Course in Turbulence (The MIT Press)
[26] Sreenivasan K R 1981 Phys. Fluids 24 1232
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