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首页> 外文期刊>International Journal of Heat and Mass Transfer >EFFECTS OF LEADING-WALL BLOWING/SUCTION ON MIXED CONVECTIVE PHENOMENA IN A RADIALLY ROTATING MULTIPLE-PASS DUCT
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EFFECTS OF LEADING-WALL BLOWING/SUCTION ON MIXED CONVECTIVE PHENOMENA IN A RADIALLY ROTATING MULTIPLE-PASS DUCT

机译：径向旋转多管风道吹壁吸风对混合对流现象的影响

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摘要

A numerical study is performed to examine the transpiration-wall effect on mixed convection in a radially rotating multi-pass square duct connected with 180 deg sharp returns. Uniform injection or suction is applied to the leading wall of the rotating duct. Finite-difference method is adopted to solve three-dimensional Navier-Stokes equations and the energy equation. Periodic conditions are used between the entrance and exit of typical two-pass duct for the closure of the elliptic problem. As predicted, results show that the radial distance from the rotational axis to initiation of flow reversal in the radial-outward duct (ROD) decreases with increasing rotational buoyancy. The appearance of flow reversal is delayed by the leading-wall blowing but is quickened by the leading-wall suction .The wall-blowing rate for avoiding the flow reversal in the ROD increases with increasing rotational buoyancy. Moreover ,the axial distribution of peripherally averaged Nusselt number is closely related to the development of cross-flow intensity. they are increased/decreased with increasing the wall blowing/suction rate in the ROD but are essentially unaltered in the radial-inward duct(RID).
机译：进行了数值研究，以研究蒸散壁对径向旋转的多通道方管中与180度尖锐回波连接的混合对流的影响。均匀的注入或抽吸作用在旋转管道的前壁上。采用有限差分法求解三维Navier-Stokes方程和能量方程。在典型的两通管道的入口和出口之间使用周期性条件来封闭椭圆问题。如预测的那样，结果显示，随着旋转浮力的增加，从旋转轴到径向向外管道（ROD）中的流动反向开始的径向距离减小。反向流动的出现由于前壁吹气而延迟，但由于前壁吸力而加快。为避免ROD中的反向流，吹壁速度随着旋转浮力的增加而增加。此外，周向平均努塞尔数的轴向分布与错流强度的发展密切相关。它们在ROD中随着壁吹气/吸气率的增加而增加/减少，但在径向向内管道（RID）中基本不变。

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