Open Access
ARTICLE
Influence of Tip Clearance on Unsteady Flow in Automobile Engine Pump
Jiacheng Dai1, Jiegang Mou1, *, Tao Liu1
1 College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, 310014, China.
* Corresponding Author: Jiegang Mou. Email: .
Fluid Dynamics & Materials Processing 2020, 16(2), 161-179. https://doi.org/10.32604/fdmp.2020.06613
Received 14 March 2019; Accepted 10 June 2019; Issue published 21 April 2020
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.
Keywords
Cite This Article
Dai, J., Mou, J., Liu, T. (2020). Influence of Tip Clearance on Unsteady Flow in Automobile Engine Pump.
FDMP-Fluid Dynamics & Materials Processing, 16(2), 161–179.