油井射流排砂泵扩散管出口流场分析

依据RNG-ε双方程湍流模型，建立油井射流排砂泵固液两相流方程；在此基础上，应用CFD计算机分析软件，对比分析了扩散管出口突变结构和渐变结构的射流排砂泵的效率、固相比、速度场分布、压力场分布。数值分析结果表明：射流泵扩散管出口采用渐变结构，可以有效减少固液两相流的逆向速度矢量，是提高射流排砂泵综合性能的有效手段。

Flow Field Analysis for the Diffuser Outlet of Jet Pump Used in the Drain Sand of Petroleum Well

The solid-liquid two-phase flow equations of the draining-sand jet pump have been established according to the RNG k-ε two-equation turbulence model. On this basis, the numerical analysis models of break and gradual changed were established .Then, the characteristics of efficiency and solid phase ratio and velocity field distribution and pressure field distribution were analyzed by the computer software of computational fluid dynamics. The numerical analysis results show that, to reduce the contrary velocity vector of the solid-liquid two-phase flow is the effective technique for improving the comprehensive properties of the draining-sand jet pump by using the gradual changed structure of the diffuser outlet.