摘要
介绍了磁力泵内外两种冷却方式,应用公式估算冷却流量,对内冷却系统中导流孔的尺寸进行设计计算.基于FLUENT数值模拟软件,采用SIMPLE算法和标准k-ε湍流模型,通过求解三维N-S方程和能量方程,对磁力泵冷却循环回路进行流场模拟.结合传热学知识对模型的边界条件进行设置.重点分析了轴截面温度场云图、隔离套底面流体温度场云图和轴中心孔开倒角前后的局部速度矢量分布图,结果表明:隔离套底部介质粘性底层是造成易挥发冷却介质汽化的主要原因;通过增大冷却流量可以避免易挥发液体在隔离套底部发生汽蚀;通过增大轴中心孔直径可以降低冷却介质出口处流速.
Two types of cooling methods for magnetic pump were introduced. The cooling flux and the dimension of flow-guided bore were calculated. By adopting the SIMPLE arithmetic and k-ε turbulent model to solve the N - S equations and the energy equation, numerical simulation on cooling fluids channel of a magnetic pump was done based on Fluent. Boundary conditions were set based on the knowledge of heat transfer. Temperature field and velocity field distributions were analyzed. The results showed that steam generation phenomena happened due to viscous layer near the bottom surface of the can, cavitation phenomena could be avoided by augmenting flux of cooling fluid, and outlet flow velocity could be reduced by augmenting the diameter of the center hole.
出处
《排灌机械》
2008年第4期26-29,共4页
Drainage and Irrigation Machinery
基金
江苏省高技术研究项目(BG2004040)
关键词
磁力泵
冷却循环流道
导流孔
圆盘损失
涡流损失
magnetic pump
cooling circulation channel
flow-guided bore
disk friction loss
eddy current loss
