Numerical Simulation Study of Impeller Rectification Effect in PCHE
There are thousands of micro-channels at the entrance of PCHE,and there is a problem of uneven flow distribution when the fluid enters the channel,resulting in poor overall heat exchange per-formance of PCHE.By numerical simulation,the influence of the rectifier structural parameters(central ring D,number of blades N and blade pitch P)on the flow field in the inlet head was analyzed by param-eterizing and comparing the fluid flow inhomogeneity coefficient α and pressure drop Plas performance in-dicators.The results show that the impeller plays a key role in the destruction of the central concentrated flow rate and the uniform development of the induced multiple eddy currents on the flow field,the smaller the diameter of the central ring and the smaller the pitch,the better the rectification effect of the impel-ler,and the more uniform distribution of the guided fluid in the flow channel due to the geometric symme-try of the four-blade impeller.
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