Stall rotating

There are three distinet stall phenomena. Rotating stall and individual blade stall are aerodynamie phenomena. Stall flutter is an aeroelastie phenomenon. 

Blade flutter and rotating stall are problems encountered in the compressor due to poor design or contamination of the blades. Changing blade angles can usually solve the problem however, this adjustment is very... 

Whether surge is eaused by a deerease in flow veloeity or an inerease in rotational speeds, either the indueer or vaneless diffuser ean stall. Whieh stalls first is diffieult to determine, but eonsiderable testing has shown that for a low-pressure-ratio eompressor, the surge initiates in the diffuser seetion. For units with single-stage pressure ratios above 3 1, surge is probably initiated in the indueer. 

When sufficient weight has been placed on the turbine motor and bit, the motor will cease to rotate and the motor is described as being stalled. At this condition, the turbine motor produces its maximum possible torque. Even when the motor is stalled, the drilling mud is still circulating and the pressure drop is approximately 1,324 psi. 

The determinations of the solubility can be carried out in various ways- One of the simplest methods, which also gives sufficiently accurate results when the temperature is not high or when the solvent is not very volatile, can be carried out in the following manner. The solid substance is finely powdered (in order to accelerate the process of solution), and placed in sufficient quantity along with the solvent in a tube carefully closed by a glass stopper the latter is protected by a rubber cap, such as a rubber finger-stall. The tube is then rotated in a thermostat, the temperature of which does not vary more than one or two-tenths of a degree, until saturation is pro-... 

The synchronous rotor carries the rotating independently excited field windings of the machine. For good control response, these must be fed with DC current via slip rings and these must be correctly sized for the low speeds and stall duties required by a hoist. The synchronous motor rotor will comprise of wound poles, pole bolting system, damper bars, slip rings/brush-less excitation and interconnections. 

This could also include supervisions such as midshaft overspeed, end of wind overspeed, overwind, underwind, wrong direction of rotation and stall, broken motor-pulley/drum drive chain, rope shp (for friction hoist) and slack rope switch (for drum hoist) supervisions. 

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