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Choking In Centrifugal Compressor

Started by ASH25320, Feb 25 2007 01:35 AM

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#1 ASH25320

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Posted 25 February 2007 - 01:35 AM

What is choking in cetrifugal compressor? Is it the upper limit of throughput? I suppose that all the energy imparted to the gas gets converted to shock & compressor is unable to discharge? is this correct assumption? Does choking involves increasing gas velocity above sonic velocity? Kindly clear the doubts.. Thanks in advance.

#2 Guest_machinery_*

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Posted 03 March 2007 - 09:20 AM

Choke flow is the high flow limit of any type of dynamic compressor curve that caused by high velocity friction. In other words, choke or stonewall is defined as the maximum flow o given impeller can handle. This value will be attained when the ratio of the relative inlet gas velocity to the sonic velocity of the gas being handle is equal to 1.0. The cause of this phenomena is excessive relative gas velocity through the impeller; as the head (energy) required by the process system is reduced, the volume flow through the impeller will increase.

The limit of compressor high volume flow is controlled by the relative mach number, which defined as (Vrelative inlet) / (K*g*R*T1)^1/2. When the relative mach number = 1, the maximum possible flow by any dynamic compressor is attained. Relative mach number is the ratio of gas impeller inlet relative velocity to the sonic velocity of the process gas.

regards,

mach

#3 harisfasanu

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Posted 15 April 2012 - 07:48 PM

Mr Mach,

Please tell me more detail, what can cause excessive relative gas velocity through impeller besides change of feed condition? Does change of impeller or other mechanical configuration within the compressor can affect the gas velocity through impeller?

Thanks and Regards,
Haris
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