基于CFD评估蒸汽喷射泵的抗背压能力

通过蒸汽喷射泵喉部出口截面单位体积流体的动能e评估蒸汽喷射泵的抗背压能力.利用计算流体力学(computational fluid dynamics，CFD)方法研究喷射泵几何参数——喉部直径d、混合室角度θ和喷嘴出口位置s对蒸汽喷射泵抗背压能力的影响，以及e与蒸汽喷射泵抗背压能力之间的关系.结果表明:随着d或θ的减小，或s的增大，都会导致e增大，此时蒸汽喷射泵抗背压能力增强；当d，θ及s变化时，e可作为评估蒸汽喷射泵抗背压能力的指标.

CFD-Based Evaluation of Back Pressure Resistance of Steam Ejectors

The back pressure resistance of the steam ejector was evaluated by the kinetic energy e of the unit volume of the steam ejector’s throat outlet section. The influence of geometric parameters of the ejector including throat diameter d， mixing chamber angle θ and nozzle exit position s on the steam ejector’s back pressure resistance and the relationship between e and the steam ejetor’s back pressure resistance were studied by using the computational fluid dynamics(CFD) method. The results showed that as d or θ decreases， or s increases， e and the back pressure resistance of steam ejector increase. When d， θ and s change， e can be used as a standard for evaluating the capability to resist the back pressure of steam ejectors.