@Article{fdmp.2020.06613,
AUTHOR = {Jiacheng Dai, Jiegang Mou, Tao Liu},
TITLE = {Influence of Tip Clearance on Unsteady Flow in Automobile Engine Pump},
JOURNAL = {Fluid Dynamics \& Materials Processing},
VOLUME = {16},
YEAR = {2020},
NUMBER = {2},
PAGES = {161--179},
URL = {http://www.techscience.com/fdmp/v16n2/38654},
ISSN = {1555-2578},
ABSTRACT = {The automobile engine pump is an important part of the automobile cooling 
system, and has a direct influence on the engine performance. Based on the SST k-ω 
turbulence model, unsteady numerical simulation for an automobile engine pump with 
different tip clearances was carried out by Fluent. To study the flow field characteristics
and pressure fluctuation, the characteristics of secondary flow distribution in volute are 
also analyzed. The result shows that the pressure fluctuation characteristics of the flow 
field show obvious periodic variation at different levels of tip clearances. The peak value 
of pressure fluctuation at each monitoring point is dependent on the blade frequency. At 
the same time, with the increase of the tip clearance, the pressure fluctuation in the blade 
and volute is gradually increased, while the pressure fluctuation at the tip is reduced 
clearance. The pressure gradient in the pump also varies periodically with the rotation of
the impeller. With the increase of the tip clearance, the pressure of the impeller, volute 
and tip clearance is gradually decreased. There are secondary flow vortexes inside the 
impeller, volute outlet and volute section. With the increase of tip clearance, the vortex 
intensity in the impeller channel is weakened, and the vortex strength at the volute outlet
is intensified. On the cross section of the volute, the morphology of most vortexes has
insignificant changes, but the vortex intensity decreased.},
DOI = {10.32604/fdmp.2020.06613}
}