Questions tagged [turbomachinery]
60 questions
8
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1 answer
What is the physical meaning of pulse rate and blood pressure, from a turbo machinery point of view?
Our hearts are peristaltic pumps, which has a periodic compression and expansion. The head developed can be taken as blood pressure.
There are situation when the blood pressure is normal while the pulse rate is high. What is the physical meaning of…
karthikeyan
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6
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6 answers
What will happen if I run a submersible pump without water?
I have a submersible pump and it's clearly stated in the user manual that it should not be operated without water.
But what will happen if it's not adhered to? The obvious answer is that it will malfunction. But I want to know what causes the…
user221238
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5
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3 answers
Turbocompressor spool geometry
How come axial compressors always narrow and turbines always widen towards the rear? From what I know:
The speed of sound of air increases with temperature, therefore increases (decreases) as it goes through the compressor (turbine).
The compressor…
setun-90
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4
votes
3 answers
How to increase the air flow rate through a dust-separating cyclone?
I'm making a dust extractor for a desktop CNC milling machine. My design process was very crude: I looked at some DIY dust-separating cyclones, and it seemed like they just work without any advanced calculations, so I visually copied some of those…
bobtato
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4
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2 answers
Advantages of hydrogen gas turbine over fuel cell
In the setting of large-scale electricity generation, I was wondering why one would want to burn hydrogen in a gas turbine instead of using it to power a fuel cell. Aren't fuel cells more efficient because they're not bound by the Carnot limit? Two…
Damian Birchler
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4
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2 answers
Tesla's Turbine in Real Life
Internet search results don't give much results of real life examples of bladeless turbine. Has anyone ever seen a working real example of Tesla's bladeless turbine, in some industrial or other application? How did it perform? What was the…
Marino Klisovich
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3
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2 answers
What's the difference between impeller and rotor in centrifugal pump?
The two terms seem interchangeable and I can't find a strict definition for both, so what's the difference between them if there is any?
Algo
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3
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Why do EMD turbochargers have so many blades?
On most turbochargers that I've seen, the compressor wheels have 6 full-length blades and 6 splitter blades, 7+7, 8+8, or 9+9. Even on large marine engine turbochargers this generally holds, like the MAN TCR which has 8+8 blades on the…
user10249
2
votes
1 answer
How should one clean the blades of a turbomolecular pump
I have a turbomolecular pump from Osaka vacuum that is quite dirty, and I'd like to clean the blades off to improve balance.
I'm not quite sure how to approach this, I've tried carbon cleaner for turbochargers for cars to no success, and my next…
tuskiomi
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2
votes
1 answer
What gives gas turbine/turbojet engines such high energy density?
What is the cause of turbojets'/gas turbines' high power to weight ratio compared to piston engines? They certainly use a generally less efficient thermodynamic cycle.
Francis L.
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Find the axial velocity of an axial turbine has a reaction ratio R = 1/2. [Principles of turbomachinery 5.7]
I'm currenty doing a course in trubomachinery at the university were I've got stuck on the following question:
An axial turbine has a reaction ratio $R =\frac{1}{2}.$ Air enters the rotor with relative
velocity at an angle $β_2 = 15^\circ$, and…
Alexander
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1
vote
1 answer
How Dump Tubes (arrangement with lot of perforation) reduces the pressure of Steam flow. How to derive a scientific basis of designing a dump tube
Recently I have come across simple yet intriguing device - The steam dump pipe with multiple perforations (orifices).
The dump pipe is typically used to reduce the steam flow pressure. The inlet steam comes at a steady rate (say 6 Tons per Hour).…
JC_
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1
vote
2 answers
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 (especially for compressible flow). The book was praised…
Felix
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1
vote
0 answers
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 pressure with less flow rate. I was a bit surprised that…
temporary_pigeon
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1
vote
1 answer
Axial compressor: How does it work that the stator vanes diffuse the flow to build up pressure, but also the flow area reduces?
I'm reading about how the stator vanes are diffusors, which diffuse the air flow in a axial compressor to a larger flow area to build up pressure BUT at the same time the compressor shows its overall flow area getting REDUCED at the same place. So,…
Riccardo
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