多级离心泵级间导叶性能优化

为研究多级离心泵导叶内的流动损失,基于DES数值模拟方法,对某型多级离心泵进行瞬态模拟,并利用试验验证了数值方法的可靠性。在此基础上,通过分析样机流场模拟结果提出导叶内损失的3种机理:漩涡、环流和碰撞。为减少导叶内损失,运用叶轮设计方法重新设计了反导叶,并对过渡段进行光滑改进。模拟结果显示改进反导叶和过渡段均能改善泵内的流场,泵效率分别提高2.4%和1.7%;耦合优化后导叶内的速度矢量和流线均未显示漩涡,环流和碰撞大大降低,泵效率提高2.9%。

径向导叶式多级泵单级叶轮切割的三维数值模拟

为探究径向导叶式压出室离心泵叶轮切割后性能的变化,基于N-S方程、标准k-ε湍流模型和SIMPLE算法对MD-280-42×4多级离心清水泵单级叶轮外径切割进行三维湍流数值计算,分析不同切割量下径向导叶式离心泵外特性和内部流动变化。结果表明:在设计工况(Qd=0.078 m3/s)下,随着切割量的增加,径向导叶式离心泵的水力效率、轴功率均呈现下降趋势;在相同小流量工况下,随着切割量的增加,叶轮与导叶间隙和反导叶流道处流动损失逐渐减小,水力效率呈现上升趋势;在相同大流量工况下,随着切割量的增加,正反导叶流道流动均匀性受到较严重破坏,产生了较大的能量耗散,水力效率明显下降。

上海凡方水泵科技有限公司

公司简介上海凡方水泵科技有限公司,在关醒凡教授指导下,进行新产品开发设计、水力模型设计研究、泵软件开发工作。CAD、CFD等手段齐全,经验丰富,有快速设计新产品(包括系列产品)的能力。愿与需方合作研究高难度泵产品和技术。一、已开发设计的泵新产品1、ISO系列端吸离心泵(42个品种):受ITT古尔兹等公司委托设计,十分畅销。2、IXO系列化工离心泵(41个品种):受江苏中意泵业制造有限公司等委托设计,受到用户好评。

2D Model of Guide Vane for Low Head Hydraulic Turbine： Analytical and Numerical Solution of Inverse Problem

Low-head hydraulic turbines are the subjects to individual approach of design. This comes from the fact that hydrological conditions are not of a standard character. Therefore, the design method of the hydraulic turbine stage has a great importance for those who may be interested in such an investment. As a first task in a design procedure the guide vane is considered. The proposed method is based on the solution of the inverse problem within the flame of 2D model. By the inverse problem authors mean a design of the blade shapes for given flow conditions. In the paper analytical solution for the simple cylindrical shape of a guide vane is presented. For the more realistic cases numerical solutions according to the axis-symmetrical model of the flow are also presented. The influence of such parameters as the inclination of trailing edge, the blockage factor due to blade thickness, the influence of loss due to dissipation are shown for the chosen simple geometrical example.