Numerical investigation on the flow and heat transfer in a rotor-stator disc cavity
Numerical investigation on the flow and heat transfer in a rotor-stator disc cavity
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DOI：
10.1016/j.applthermaleng.2015.05.002
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发表时间：
2015-08
影响因子：
6.4
通讯作者：
Gaoliang Liao;Xinjun Wang;Jun Li;Junfei Zhou
中科院分区：
文献类型：
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作者：
Gaoliang Liao;Xinjun Wang;Jun Li;Junfei Zhou
本文对转静盘腔内的流动和换热特性进行了数值研究。采用雷诺平均Navier-Stokes方程，耦合标准k-ε湍流模型进行求解。本文研究了四种不同的二次风流量和五种不同的旋转雷诺数对流动和传热的影响。研究结果表明，除小半径区域外，换热系数随旋转雷诺数的增大而增大。局部Nusselt数与局部旋转雷诺数之间存在幂律关系。密封效率随二次风流量的增加而增加，低流量时的下降幅度随旋转雷诺数的增加而减小。转静腔内的流动结构并不是保持不变的，沿径向沿着向外流动结构可能经历从Batchelor型向Stewartson型的转变。泵送效应是指转子表面附面层中的离心力驱动空腔流体向外流动，并诱导定子表面的补偿流体向内流动。最后，本文首次提出了一种新的全耦合传热方法。
This paper presents a numerical investigation on the flow and heat transfer characteristics in a rotor-stator disc cavity. The Reynolds-averaged Navier–Stokes equations, coupled with standardk–εturbulent model, are adopted and solved. Four different secondary air flow rates and five kinds of rotational Reynolds numbers have been examined to determine the effect on the flow and heat transfer. Some results obtained in this study indicate that the heat transfer coefficients increase with the increasing rotational Reynolds numbers except for some small radius region. The local Nusselt number could be correlated with the local rotational Reynolds number by power laws. The sealing effectiveness increases with the increasing secondary air flow rates and its decreasing drop at low flow rate decreases with the increase of rotational Reynolds numbers. The flow structure in the rotor-stator cavity does not remain unchanged and it could experience a transition from Batchelor-type to Stewartson-type outward along the radial direction. Pumping effect that the centrifugal forces in the boundary layer at the rotor surface drives the cavity fluid outward and induces the compensatory fluid at the stator surface flow inward. In final, a new fully-coupled heat transfer method has been firstly presented for a trial.