Specific Speedidentifies the geometrically similarity of pumps Specific speed can be expressed as Ns= n q1/2/ h3/4(1) where Ns= specific speed n = pump shaft rotational speed (rpm) q = flow rate (m3/h, l/s, l/min, m3/min, US gpm, British gpm) atBest Efficiency Point (BEP) ...
Specific Speed of Pump The specific speed “Nq” is a parameter derived from a dimensional analysis which allows a comparison of impellers of various pump sizes even when their operating similar Q -H range. The specific speed can be used to classify the optimum impeller design. Specific Speed ...
dimensionless specific speed 无因次比转速 low specific speed 低比速 rated specific speed 额定比速 high specific speed pump 高比转速泵 higher specific speed Francis turbine 高比速混流式水轮机 To be specific prep.明确地讲 at the speed of 以...的速度 相似...
HIGH SPECIFIC SPEED PUMPPROBLEM TO BE SOLVED: To provide a high specific speed pump capable of enhancing the centrifugal effect for a fluid and operating stably over the whole flow range.MAEDA MANABU前田 学KOBAYASHI ICHITA小林 一太
aUse this mode when you wish to travel with a specific speed (e.g. a conveyor belt or pump speed). 使用这个方式,当您希望旅行以一张具体速度时(即。 传送带或泵浦速度)。[translate]
1) Specific speed 比转速 1. Selection of specific speed of pump turbine for Wulongshan pump storage power station; 乌龙山抽水蓄能电站水泵水轮机比转速选择 2. Influences of the leakage rate of low specific speed Francis runner on phenomenon of the lifting hydroelectric generator set; 低比...
This paper presents results from an experiment performed to obtain the dynamic characteristics of a reversible pump-turbine model. The characteristics were measured in an open loop system where the turbine initially was run on low rotational speed before the generator was disconnected allowing the ...
It is very important to use high-speed centrifugal pump with low specific instead of multi-stage high-pressure pump to reduce the volume of the whole marine reverse osmosis seawater desalination system. Based on the design model of high-... X Li,Y Ji,H Cui,... - 《Iop Conference》 被...
Pump efficiency drops rapidly with a decrease in specific speed ns in the very low ns range. In order to improve a pump efficiency and to establish the optimum design method of a volute pump of very low specific speed around ns=6070[m, m3/min, rpm], several combinations of centrifugal im...
of both enlarged flow and enlarged specific speed were established.The equations were numerically calculated and the corresponding curves were plotted.The curves contain the specific speed from 23 to 90 and flow rate from 3 to 30 cubic meters per hour.The current hydraulic models of the pump ...