# 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 ...
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### 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 ...
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### 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 ...
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### Is front shroud more thick than the lower shroud used in impellers ? Thickness of shrouds of shrouded impellers used in turbo pumps of rocket engines

This is an impeller used in turbopumps for increasing the pressure of propellants to drive the rocket engines. I wanted to ask all the engineers currently working in manufacturing of these impellers ...
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### Dixon/Hall's "Fluid Mechanics and Thermodynamics of Turbomachinery" full of errors?

Note: This is no homework, but self-study. I have a thermodynamics and fluid mechanics background and am trying to work through this book in order to get better understanding of turbomachines (...
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### Centrifugal Compressor selection

I am currently trying to select a centrifugal compressor for a wind tunnel project. The requirement is that the flow velocity in the test section is Ma 0.1. The geometry of the wind tunnel has already ...
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### Aerodynamic design and characteristic of fan vs blower

I just learnt about the difference between a fan and a blower, namely the former providing high flow rate at very low outlet pressure (<1.1*inlet) and the latter providing a slightly increased ...
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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.
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### 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 ...
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### Turbomachines numerical please help

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 ...
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41 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 ...
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### 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?
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### What does the author mean? Turbomachinery - Reaction

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} ...
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