pump head

Development of Performance Test Apparatus of Screw Pump Driving Head

螺杆泵驱动头性能检测试验台研制

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The relative error of computational head coefficient of the centrifugal pump compared with experiments is less than 6%, the distribution of the numerical head coefficient on blades agrees well that obtained by experiment;

计算的离心泵叶轮扬程系数与试验结果的相对误差小于6%，计算的叶片表面压力系数的分布与实验数据十分吻合；

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The confined aquifer is influenced by both heat transfer and groundwater flow during storing energy. The temperature field and head field will change a lot, which have an impact on pumping temperature and storage ratio, and then decrease the efficiency of heat pump system.

在储能过程当中，含水层受到地下水流动和传热的耦合影响，其温度场，压力场有较大的变化，进而对抽水温度和储能率造成影响，影响整个热泵系统的效率。

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With the analysis of forming mechanism of the actual Quantity-Head curve of centrifugal pump, the relation of slope and hump of theoretical Quantity-Head curve of centrifugal pump was derived mathematically, and the relation of specific speed and curve slope was presented.

分析了离心泵实际流量扬程曲线的形成过程，数学推导了理论流量扬程曲线斜率与驼峰的关系，提出了比转速与斜率大小的关系曲线。

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The non-dimensional pump head coefficient tends to become larger than the quasi-steady value at the very beginning of the start, which indicates obvious transient effect.

在启动初始阶段，无量纲扬程呈现很大值，继而迅速减小到低于准稳态假设值，表现出明显的瞬态效应。

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No manual adjustment is required, either ? occlusion is set when the pump head cover is closed.

完全不需要手动调节, 而且当泵头的盖关闭的时候,会设置闭塞.

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The Newton iteration method is used to solve the economic pressure on the unknown node, so as to calculate the economic head loss and economic pipe diameter of each section, and economic head of second-stage pump station.

采用牛顿迭代法来求解各未知节点的经济水压，进而得出各管段的经济水头损失、经济管径和水源二级泵站的经济扬程。

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An Analysis of the Performance of Flow and Head by Sliding Vane Pump and Centrifugal Pump in Series

滑片泵与离心泵串联运行流量与扬程特性实验

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Due to the pump effect of the pitch changes of the propeller, the oil is circulating through valves in the propeller head and tail shaft.

因为泵的作用使螺旋桨的螺距改变，油通过阀门在螺旋桨头和尾轴里循环。

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The feature of the progressive cavity pump mobile intermittent recovery technique is using a tractor as power unit, adopting a double universal coupling transmitting the power to a drive head to make the rod string rotate and thereby drive the progressive cavity pump for pumping.

新开发的螺杆泵机动间歇采油技术及设备的主要特征是用拖拉机做动力源，用双万向联轴器把动力传递给驱动头，由驱动头带动抽油杆柱旋转，进而驱动螺杆泵旋转抽油。

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On condition that the process is fixed, we qualitatively point out that the temperature of spin head and temperature of spin pump are in direct proportion to the reduction of viscosity.

在一定的工艺条件下，定性指出了纺丝箱体温度、计量泵温度与粘度降成正比。

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Theoretical pressure head and performance curves of submersible electric centrifugal pump for gas-liquid mixture

电动潜油离心泵输送气液两相介质的理论压头和理论特性曲线

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