外环流活塞泵数值计算与内流特性分析  

Numerical Calculation and Analysis of Internal Flow Characteristics of Outside Circulation Piston Pump

作　　者：范意斐 王新华 毛洲 

机构地区：[1]杭州伯勒计算机技术有限公司,杭州310001

出　　处：《机械工程师》2016年第3期180-183,共4页Mechanical Engineer

摘　　要：外环流活塞泵是一种适于输送高黏度介质的双转子泵,广泛用于化工、石油等领域。对于这种泵的设计与优化已有一定理论基础,但对其内流特性尚缺少认识。为了研究泵内的流场特性,采用浸入式模型对外环流活塞泵进行了三维瞬态数值计算,并结合相关理论对计算结果进行了分析。结果表明,转子腔室的排液过程由两部分组成,一是转子啮合产生的主脉动,二是易闭死区域的局部高压产生的次脉动。传统流量计算公式误差较大,而根据内流特性提出的用叶片体积计算流量的方法相对误差最小。采用圆弧作为过渡曲线时,增大圆弧半径有助于降低易闭死区域内的压力与真空度,缓解振动、噪声和空化等问题,但流量会小幅降低。Outside circulation piston pump is a kind of dual rotor pump for transporting high viscosity medium. The design and optimization of this kind of pump already has theoretical basis, but the internal flow characteristics of it is still lack of understanding. To study the internal flow characteristics of outside circulation piston pump, three-dimensional transient numerical calculation is carried out using immersed solid model, and the results are analyzed using related theory. The result shows, the discharge process of the rotor chamber consists of two parts, one is the main pulse produced by the rotor meshing, the other one is the secondary pulse produced by the local high pressure in the dead volume area. Flow rate calculated by traditional formula has a larger error, flow rate calculated according to the volume of the blades has the smallest error. When using arc line as the transition curve, increasing the radius of the arc line could reduce the high pressure and vacuum in the dead volume area, but the flow rate will decrease slightly.

关 键 词：外环流活塞泵 转子泵 数值计算 流量 闭死容积 

分 类 号：TH321[机械工程—机械制造及自动化]