Numerical Simulation of Ejection Performance of GasLiquid Ejector under Different Inlet and Outlet Conditions

Jingxuan QIN  Ping ZHENG   Xu CHEN

doi:10.12034/j.issn.1009-606X.216318

The Chinese Journal of Process Engineering >

2017 , Vol. 17 >Issue 3: 469 - 476

DOI: https://doi.org/10.12034/j.issn.1009-606X.216318

Flow & Transfer

Numerical Simulation of Ejection Performance of GasLiquid Ejector under Different Inlet and Outlet Conditions

Jingxuan QIN Ping ZHENG Xu CHEN

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College of Petroleum Engineering, Liaoning Shihua University, Fushun, Liaoning 113001, China

Received date: 2016-10-12

Revised date: 2016-12-04

Online published: 2017-06-14

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Abstract

.According to the shortage of both traditional two-dimensional design and no considering of gas-liquid phase change in numerical simulation, the ejection performance of gas-liquid ejector was simulated by CFD software. Three-dimension model was established and phase change UDF procedure influenced by time and temperature was used. The simulation results are in good agreement with experiments when phase change caused by temperature is taken into account after 40000 s. The axis velocity, pressure, temperature, entrainment ratio, volume fraction of gas and liquid were obtained by changing the inlet and outlet conditions of gas-liquid ejector. The results showed that entrainment ratio increases with inlet liquid velocity, and reasonable inlet velocity can stabilize volume fraction of gas and liquid and entrainment ratio and benefit to ejection. As outlet pressure increases, entrainment ratio decreases, while volume fraction of LNG increases. Higher outlet pressure can result in inclined flow and BOG liquefaction at the outlet of diffuser which are harmful to ejection. For the specific ejector described in this paper, it is the best ejection performance that liquid inlet velocity is from 11 to 12 m/s and mixture outlet pressue is from 0.101 to 0.304 MPa . of gas-liquid ejector was simulated by CFD software. Three-dimension model was established and phase change UDF procedure influenced by time and temperature was used. The simulation results are in good agreement with experiments whenstabilize

Key words： ejector; gas-liquid flow; phase change; entrainment ratio; CFD modeling; Numerical simulation

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Jingxuan QIN Ping ZHENG Xu CHEN . Numerical Simulation of Ejection Performance of GasLiquid Ejector under Different Inlet and Outlet Conditions[J]. The Chinese Journal of Process Engineering, 2017 , 17(3) : 469 -476 . DOI: 10.12034/j.issn.1009-606X.216318

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