Extended two-fluid model applied to analysis of bubbly flow in multiphase rotodynamic pump impeller

doi:10.1007/s11465-009-0006-0

Front Mech Eng Chin

2009, Vol. 4

Issue (1) : 53-59 https://doi.org/10.1007/s11465-009-0006-0

RESEARCH ARTICLE

Extended two-fluid model applied to analysis of bubbly flow in multiphase rotodynamic pump impeller

Zhiyi YU¹(

), Guoyu WANG¹, Shuliang CAO²

1. School of Mechanical and Vehicular Engineering, Beijing Institute of Technology, Beijing 100081, China; 2. Department of Thermal Engineering, Tsinghua University, Beijing 100084, China

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Abstract

This paper presents an extended two-fluid model based on the Navier-Stokes equations and the standard k-? turbulence model, to simulate the three-dimensional air-water bubbly flow in turbo machinery. In the governing equations, the drag force and added mass force are added and the additional source terms arising from fluctuations of gas volume fraction are considered. The discrete equations are solved using a developed two-phase semi-implicit method for pressure-linked equations, consistent (SIMPLEC) algorithm in body-fitted coordinates with a staggered grid system. Simulation is then carried out for the pure liquid flow and air-water two-phase flow with the inlet gas volume fraction being 15% in a multiphase rotodynamic pump impeller and the pump head performance is predicted. Comparison with experimental results shows the reliability and commonality of the numerical model.

Keywords two-fluid model multiphase rotodynamic pump SIMPLEC algorithm numerical simulation

Corresponding Author(s): YU Zhiyi,Email:yuzhiyi@bit.edu.cn

Issue Date: 05 March 2009

Cite this article:

Zhiyi YU,Guoyu WANG,Shuliang CAO. Extended two-fluid model applied to analysis of bubbly flow in multiphase rotodynamic pump impeller[J]. Front Mech Eng Chin, 2009, 4(1): 53-59.

URL:

https://academic.hep.com.cn/fme/EN/10.1007/s11465-009-0006-0
https://academic.hep.com.cn/fme/EN/Y2009/V4/I1/53

Fig.1 Schematic diagram of multiphase rotodynamic pump stage

Tab.1 Total volume flow rate coefficient set in simulation

Fig.2 Computational grid for flow analysis

Fig.3 Distribution of pressure contours (left) and velocity vectors (right) in pure liquid flow. (a) In section close to pressure surface (=2); (b) in section at middle of blade passage (=12);(c) in section close to suction surface (=23)

Fig.4 Distribution of pressure contours (left) and gas volume fraction contours (right) in two-phase flow (). (a) In section close to pressure surface (=2); (b) in section at middle of blade passage (=12); (c) in section close to suction surface (=23)

Fig.5 Distribution of gas velocity vectors (left) and liquid velocity vectors (right) in two-phase flow (). (a) In section close to pressure surface (=2); (b) in section at middle of blade passage (=12); (c) in section close to suction surface (=23)

Fig.6 Schematic diagram of gas-liquid two-phase flow pump performance test apparatus

Fig.7 Head performance of multiphase rotodynamic pump

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