变截面U形通道内肋高对换热特性影响的实验

刘湘云; 丁水汀; 陶智; 徐国强

变截面U形通道内肋高对换热特性影响的实验

北京航空航天大学能源与动力工程学院, 北京 100083

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出版历程
- 收稿日期: 2006-09-25
- 修回日期: 2007-04-20
- 刊出日期: 2007-07-28

Experimental study of heat transfer in snake-shaped variable cross-section channels with different ribs heights

School of Jet Propulsion, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

摘要

摘要: 采用实验方法研究了在定常状态下, 肋的高度对横肋变截面U形通道内的换热特性的影响。通道内肋间距为15 mm, 肋的宽度均为2 mm, 肋的高度分别为1, 1.5, 2 mm和2.5 mm。雷诺数在12 000到56 000之间变化, 采用单元分析法, 以相同形状的无肋通道作为基准, 研究了肋的高度对肋间距为15 mm通道的换热效果及阻力影响, 得到了包括几何参数在内的经验关联式。结果表明, 有肋的通道换热都得到了增强;肋高度的变化对变截面蛇形通道换热的影响不是单调的, 而是呈多峰分布;肋的高度对阻力系数的影响却是随着肋高的增大而增大的。
- 航空、航天推进系统 /
- 变截面 /
- 肋高 /
- U形通道 /
- 换热
Abstract: The influence of the rib heights on heat transfer characteristics in U-shaped variable cross-section channels was experimentally studied in the steady state.The design parameters include:relative roughness pitch 15 mm,rib width 2 mm,and relative roughness heights 1 mm,1.5 mm,2 mm,and 2.5 mm,respectively,and Renault number from 12 000 to 56 000.Based on ribless channel of the same shape,the influence of rib heights on heat transfer effect and resistance of a channel with 15 mm pitch was studied,so an empirical relational expression comprising geometrical parameters was obtained.The experimental results show that,the heat transfer of ribbed channel will be improved;the influence of the rib heights on the heat transfer of U-shaped variable cross-section channel is not monotone,but distributed with multi peak values.The influence of rib heights on the resistance coefficient increases with the rib heights.
- aerospace propulsion system /
- variable cross-section /
- rib heights /
- U-shaped channel /
- heat transfer

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参考文献(4)

[1]	Hsieh S S,Hong Y J.Heat transfer coefficients in an orthogonally rotating duet with turbulators[J].Int.J.Heat Mass Transfer,1995,71:69-78.
[2]	Ekkad S V,Han J C.Detailed heat transfer distributions in tWO-pass square channels with rib turbulators[J].Int.J.Heat Mass Transfer,1997,40:2525-2537.
[3]	Ekkad S V,Pamula G,Shantiniketanam M,et al.Detailed heat transfer measurements inside straight and tapered two-pass channels with rib turbulators[J].Experimental Thermal and Fluid Science,2000,22:155-163.
[4]	刘湘云,丁水汀,陶智,等.不同肋间距变截面回转通道内流阻与换热特性[J].航空动力学报,2004,19(5):640-644.LIU Xiangyun,DING Shuiting,TA0 Zhi,et al.The characteristic of the flow resistance and the heat transfer in turnover cross channel with different rib pitches[J].Journal of Aerospace Power,2004,19(5):640-644.