Abstract
To analyze the internal flow of the engine cooling water pump (ECWP) under thermodynamic effect, Zwart cavitation model based on the Rayleigh-Plesset equation is corrected, and NACA0015 hydrofoil was selected to verify the corrected model. The cavitation performances of ECWP with different temperatures were numerically simulated based on a corrected cavitation model. Research results show that simulation values of pressure distribution coefficient in hydrofoil surface at 70 °C are in closest agreement with experimental values when the evaporation and condensation coefficients are 10 and 0.002, respectively. With the decrease of absolute pressure in pump inlet, bubbles firstly occurred at the blade inlet side near the suction surface and then gradually extended to the pressure surface, finally clogged the impeller passage. Compared to the inlet section, the cavitation degree is much more serious close to the trailing edge. With the temperature increases, the cavitation in ECWP occurs in advance and rapidly, and the temperature plays an important role in promoting cavitation process in ECWP. Based on the unsteady simulation of ECWP, the influence of cavitation on the performance characteristics is studied. The results provide a theoretical reference for the prediction and optimization of the cavitation performance in ECWP.
Highlights
As the key component of circulating cooling water in engine cooling system, the engine cooling water pump (ECWP)’s performance impacts the dynamic and economical property of engine and shortens the lifespan of the entire machine
As the thermodynamic effect plays an important role in the cavitation process, it has already attracted the attention of researchers
Franc [9,10] took thermodynamic effect into consideration to study the cavitation phenomenon in the inducer, and the results found that with the increase of temperature, the length of the cavity is reduced and the cavitation performance is enhanced
Summary
As the key component of circulating cooling water in engine cooling system, the engine cooling water pump (ECWP)’s performance impacts the dynamic and economical property of engine and shortens the lifespan of the entire machine. Cavitation is more likely to occur in ECWP as a result of its high working temperature, large variation of rotation speed, and its size limitation restricted by the engine. Cavitation has become a leading inducement shortening operation life of vane pumps, inducing hydraulic excitation and other detriments, which gravely effects the normal operation of engine cooling system [1,2,3]. As the thermodynamic effect plays an important role in the cavitation process, it has already attracted the attention of researchers. In terms of theoretical analysis, Plesset [7]
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