| 单词 | specific speed |
| 释义 | specific speed [spǝ`sif·ik `spēd] MECHANICAL ENGINEERING A number, Ns , used to predict the performance of centrifugal and axial pumps or hydraulic turbines: for pumps, Ns = N √Q/H3/4; for turbines, Ns = N = √P/H5/4, where Ns is specific speed, N is the rotational speed in revolutions per minute, Q is the rate of flow in gallons per minute, H is head in feet, and P is shaft horsepower. |
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