Centrifugal Compressor: Converting Kinetic to Pressure Energy

[ahmedbadr]

in the centrifugal compressor the function of the volute or the diffuser to convert kinetic energy into pressure energy my question is isn't it bernouuli equation??and we can apply bernouuli equation to incompressible fluid??
also wouldn't that cause an exapnsion to fluid which causes reduction in presuure??

also the lecturere told us that in multi stage compressors the diamters get smaller so expansion wouldn't happen so i can mainatain high pressure ??

so i see contadiction about that i hope if you can clarfiy that.i feel so confused.

 

[Navin A S]

Yes, the Bernoulli equation is a useful tool for analyzing the performance of centrifugal compressors. It is used to calculate the pressure and velocity of the fluid at different points in the compressor. The volute or diffuser is designed to convert the kinetic energy of the fluid into pressure energy. As the fluid moves through the volute, its velocity is reduced, causing an increase in pressure. This increase in pressure is achieved without any expansion of the fluid, which would cause a reduction in pressure. In multi-stage compressors, the diameter of the volutes or diffusers decreases with each stage. This increases the pressure of the fluid without any expansion, as the velocity of the fluid is reduced more quickly due to the smaller diameter.