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微通道直角突缩弯道气体流阻特性

曹娇坤 丁水汀 杜发荣

曹娇坤, 丁水汀, 杜发荣等 . 微通道直角突缩弯道气体流阻特性[J]. 北京航空航天大学学报, 2013, 39(7): 885-889.
引用本文: 曹娇坤, 丁水汀, 杜发荣等 . 微通道直角突缩弯道气体流阻特性[J]. 北京航空航天大学学报, 2013, 39(7): 885-889.
Cao Jiaokun, Ding Shuiting, Du Faronget al. Pressure losses in gas flow through sudden contractive sharp bends in micro channels[J]. Journal of Beijing University of Aeronautics and Astronautics, 2013, 39(7): 885-889. (in Chinese)
Citation: Cao Jiaokun, Ding Shuiting, Du Faronget al. Pressure losses in gas flow through sudden contractive sharp bends in micro channels[J]. Journal of Beijing University of Aeronautics and Astronautics, 2013, 39(7): 885-889. (in Chinese)

微通道直角突缩弯道气体流阻特性

详细信息
  • 中图分类号: TK 124

Pressure losses in gas flow through sudden contractive sharp bends in micro channels

  • 摘要: 采用有限体积方法,研究了矩形截面微通道直角突缩弯道局部流场及压力损失机理,重点考虑了雷诺数和弯道进出口截面面积比对局部流场及压力损失的影响,雷诺数范围为1~200,特征尺寸为500 μm.研究表明,低雷诺数时压力损失主要由壁面摩擦产生,弯道压力损失系数与具有相同中心线长度的直通道的压力损失系数变化趋势相同,但在数值上较小,突缩弯道会引起弯道内速度型发生变化,影响弯道压力损失;而高雷诺数时,压力损失主要由弯道内角位置的速度分离及漩涡产生,突缩弯道会抑制速度分离及漩涡产生,进而降低弯道压力损失.根据计算结果,拟合了弯道压力损失系数与雷诺数及进出口截面面积比的关系式.

     

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出版历程
  • 收稿日期:  2012-07-26
  • 网络出版日期:  2013-07-30

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