# Questions tagged [turbomachinery]

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### Pressure recovery in turbomachinery

Diffusers in turbomachinery are used to transfer some of the kinetic energy of the fluid to pressure energy and to direct the fluid to the ducting/second stage/... I understand this and the mechanism ...
1 vote
34 views

### Turbocharger boost control using two valves with a vac and boost reference for wide boost control range

Can someone explain how the above boost control setup would work. The valve on the left uses a vac source applied to the top of the diaphram which would effectively help hold the spring closed at high ...
• 111
1 vote
302 views

### How do I calculate the force coming from the centrifugal compressor exhaust?

Let's say I have a centrifugal compressor as shown in the figure and I know the following parameters----1 Thrust Inlet and outlet pressure Power required to operate the compressor Inlet and outlet ...
• 121
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### Kindly explain this graph which is related to internal combustion engines

Hello, I am not getting this graph which is related to the Internal Combustion Engine.
17 views

### Compression phenomenon in Axial flow compressor

It is quite difficult for me to visualize how axial flow compressors work, as in, how air gets compressed by just flowing through a series of aero-foil shaped stator and rotor blades. How and where ...
23 views

A twin jet Pelton wheel has a mean runner diameter of 1.68 m & runs at 500rpm, each jet is of dia. 152 mm. The net head is 510 m. Bucket turns the jet through 1650 & relative velocity is ...
36 views

### What drives the mass flow rate in axial turbofan between the compressor and the turbine when compressor is fully choked?

I haven't found the answer in the forum or elsewhere, but maybe I have searched badly, in which case please forgive me in advance. For a steady nominal operation of a turbofan, I have heard that the ...
103 views

### How is the number of blades on a centrifugal compressor determined?

If I know the tip and hub diameter of a centrifugal compressor ,the inlet velocity and outlet velocity, how do I determine the number of blades on a centrifugal compressor?
• 121
I am reading a book of Fundamental Energy Systems. The author describes the rate of change in head for a turbomachine as:  \frac{1}{2}[(V_1^2-V_2^2)+(U_1^2-U_2^2)+(V_{R2}^2-V_{R1}^2)] = H =U_1V_{u1} ...