specific speed


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specific speed

[spə′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)/ H 3/4; for turbines, Ns = N √(P)/ H 5/4, 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.
References in periodicals archive ?
Pros: Allows for the setting of specific speed, length of time and other boundaries including extreme temperature settings for engine idle.
There are a quite few applications with specific speed requirements, which will continue seeking skid steer loaders (SSLs).
They all agree that the sway and roll of the bait at a specific speed and depth is what triggers a bite.
For the first time, the event included pace runners, who ran at a specific speed, to help participants challenge themselves and achieve a personal best.
For this test, the sample is impacted repeatedly at a specific speed and mass with a defined period of rest in between impacts, which allows the material to recover.
These competitive advantages are achieved through a pre-validation process in which mechanical and tribological testing helps select precise fit material for an application with a specific speed and load, specialized test rigs are used to perform testing in simulated end user hardware, and endurance testing of seals are conducted in house.
This device measures wind speed along with the duration of specific speed ranges and stores the data electronically, allowing you to quantify the "wind regime" at your site accurately and to estimate long-term energy production.
If they want you to fly a specific speed and for any reason you cannot, decline the clearance and tell them why: "Unable due to turbulence." The worst that can happen is you get vectored out of sequence while you fly at the necessary speed.
"For media productions, a photographer can program it to drive a specific speed and distance via the digital joystick."
Most other riders from the club took to their turbo trainers to do specific speed or endurance work, to maintain base fitness and start to build themselves up for the upcoming season.
The design of desulfurization dust removal centrifugal pump is a single suction impeller: pump specific speed ns = (3.65n [square root of (Q)])/[H.sup.3/4] = 65.95, hydraulic efficiency [[eta].sub.h] = 1 + 0.0835lg(Q/n)1/3 = 0.860, volumetric efficiency [[eta].sub.v] = 1/(1 + 0.68n-2/3) = 0.960, and mechanical efficiency [[eta].sub.m] = 1 - 0.07 (1/ ([n.sub.s]/100)7/6) = 0.886.
To work on the specific speed of the footballer, sprints of 20-40m are required.