Performances and Rotating Flows of Rotary Jet Pump

The rotary jet pumps, namely the pitot pumps, are composed of the rotating casing with the impeller channels and the stationary pick-up tube for discharging, are known as the one of high pressure pumps in the U.S. market. The pumps, however, have been prepared experientially, because of poor knowledge for the flow conditions and the pump performances. Then, this paper discusses the pump performances and the internal flow conditions in the rotating casing. Three types of the pick-up tube were prepared for the experiments to know the pump performances and the flow conditions in the rotating casing. The flow in the rotating casing is nearly in the forced vortex type and gives the higher pressure at the pick-up tube inlet. The more cross-sectional area of the pick-up tube channel is large, the more head and discharge are higher with excellent efficiency. Moreover, the authors confirmed that the secondary flow runs toward the rotating center at the wake flow region behind the pick-up tube.

旋壳泵的发展综述与应用展望

微小流量高扬程的旋壳泵比高速泵具有更高的性价比,介绍了旋壳泵的起源、发展现状、结构、工作原理、性能参数及特点,分析了旋壳泵与高速泵的应用优势,及其经济性。而旋壳泵由于其更高的效率、更低的转速、更平稳的运行特性、更长的轴承使用寿命、更低的运行成本,在小流量高扬程的工艺操作条件下,可替代高速泵大量运用于对流体输送要求较平衡的生产岗位。

基于FLUENT的皮托管泵的内部流场数值模拟

针对皮托管泵内的核心部件皮托管,以RO-D484型皮托管泵为基础,利用计算流体动力学软件FLUENT,采用连续方程、动量方程、标准k-ε模型和SIMPLEC算法对其内部流场进行数值模拟,得到皮托管泵内部流体的压力场、速度场的分布情况。设计了3种不同进口倾角的皮托管,分别与其他部件组合在一起进行多次仿真,分别得出它们的内部流场分布情况,通过对比分析仿真结果,得到进口倾角对皮托管泵性能的影响。

小型锅炉给水泵的优化设计

介绍了一种与现在多级离心泵完全不同的小型锅炉（10t／h以下）给水泵。在同样的低比转数（n6≤20）条件下，比现有多级离心泵的水力效率可提高5％～8％。因结构重量的大幅度下降，其造价比现有多级离心泵低10％以上，其性价比有显著优势，值得在小型锅炉中推广。