The laminar and turbulent flow pattern of a pitched blade turbine

The laminar and turbulent flow pattern of a pitched blade turbine
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倾斜叶片涡轮机的层流和湍流流型

DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
C. K. Lee
C. K. Lee
中科院分区：
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文献类型：
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作者：
A. Bakker;K. Myers;R. W. Ward;C. K. Lee

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采用激光多普勒测速（LDV）和数字粒子图像测速（DPIV）技术，对变桨距涡轮机在层流和湍流工况下的流场进行了研究。这些数据已被用于严格评估计算流体混合（CFM）工具的性能。已经发现，如果围绕叶轮的整个周边提供适当的速度边界条件，则当前CFM软件可以准确地预测斜叶片叶轮的层流行为。在湍流运行中，CFM模拟预测了流场的一些特征，但大大低估了容器中的总能量耗散率。他们目前还不能描述DPIV检测到的流动中的大规模不稳定性。
The flow field generated by the pitched-blade turbine in both laminar and turbulent operation has been investigated using laser Doppler velocimetry (LDV) and digital particle image velocimetry (DPIV) experimental techniques. This data has been used to critically evaluate the performance of computational fluid mixing (CFM) tools. It has been found that current CFM software can accurately predict the laminar flow behaviour of the pitched-blade impeller if the proper velocity boundary conditions are provided around the entire periphery of the impeller. In turbulent operation, CFM simulations predict some of the features of the flow field, but dramatically underpredict the total energy dissipation rate in the vessel. They are not currently capable of describing the large-scale instabilities in the flow detected by DPIV.