Questions tagged [turbomachinery]

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Need a recommendation of open-source 1-D design code of turbomachinery

I am looking for an open-source code for 1-D turbomachinery design, like in the following link. I searched GitHub but got not many options. Any recommendation is welcome. https://github.com/...
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1answer
29 views

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 ...
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1answer
22 views

What is the diffusion process that takes place in a diffuser/stator?

I understand mass diffusion. But what is the meaning of 'diffusion' which converts the kinetic energy to rise in pressure in a stator/diffuser?
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Does pressure ratio of a compressor/turbo include dynamic pressure or is it just the ratio of outlet/inlet static pressures?

Is it Outlet Static Pressure/Inlet Static Pressure, or is it (Outlet Static Pressure + Outlet Dynamic Pressure)/ (Inlet Static Pressure + Inlet Dynamic Pressure)
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1answer
28 views

Relation between Inlet and Outlet mass flow rate for a turbocharger?

For the compressor maps for automotive turbochargers, the Corrected mass flow rate (at inlet) is given as abscissa. However, I wish to know the mass flow rate at the outlet. What is the relation in ...
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1answer
24 views

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.
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1answer
61 views

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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0answers
18 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 ...
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1answer
15 views

Relationships among turbo jet rpm and compression ratio and thrust

A question about performance of a turbojet. Why are compression ratio and thrust are not in linear but increase exponentially with RPM?
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2answers
153 views

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 ...
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1answer
119 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 ...
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38 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?
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2answers
27 views

Why doesn't axial turbomachinery blades block fluid from flowing?

I know this is a silly question, but shouldn't the high speed rotating blades (in case of an axial air compressor or an axial air fan for example) block the air from flowing? What makes air flow ...
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1answer
42 views

Working of a fan or propeller

I can roughly understand the working of an axial flow gas turbine i.e. the fluid moves over the blade and gets redirected, its whirl velocity component changes and the blade is pushed in the opposite ...
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654 views

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 ...
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1answer
158 views

Why regenerator “wheels” in a turbine engine?

Back in the early 60s, Chrysler built a turbine car powered by a turbine engine it had under development. An interesting feature of the engine was a regenerator system to recover heat from the gases ...
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1answer
573 views

What is the purpose of a vacuum cleaner's bypass valve?

I took apart a cheap domestic vacuum cleaner because I am making a small vacuum-forming system, and I only need the motor/fan assembly, so I repackaged it to save space. Inside the vacuum cleaner is ...
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1answer
26 views

When were airfoil cross-sections first used in turbine blades?

When were airfoil cross-sections first used in turbine blades? When did this become standard practice? Did people understand the connection to aircraft, or did heavier-than-air aircraft exist at all ...
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1answer
77 views

Does the turbine outlet affect the power generated by the turbine ?

In my text book , it is written "Power generated by the turbine can be increased by using a gradual expansion at the turbine outlet" The picture below explains the meaning of gradual expansion at ...
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1answer
2k views

What is the difference between turbo wastegate and variable geometry turbo?

I don't see what the difference is between turbo wastegate and variable geometry turbo. Both seem to allow some of the gas flow, without turning the turbine, ie. bypassing the turbine, have I ...
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1answer
192 views

How do Cogs and belts work? / Cogs and belts in an ICAS exam

Does the left red wheel turn in the same direction as the leftmost orange wheel?If so P and S go up? If not, Q and S go up? My reasoning: If so Leftmost orange cc Left red cc (by assumption) ...
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1answer
76 views

turbojet axial compressor: blades of HP compressor

I noticed that blades of HP compressor are shorter in axial dimension next to its LP counterpart. Why? I understand why it is smaller in radial dimension (this is because compressed air has smaller ...
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1answer
139 views

In what order turbojet engine parameters are calculated?

As I see it, if you're going to calculate a twin-spool turbojet engine, you Determine expected max aircraft speed, and engine thrust at that speed and when stationary. Calculate peak mass of air flow ...
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1answer
43 views

Power/Efficiency of expanding air-flow

Assuming, I've got a machine, that runs with pressurized air and provides the following measurements: $\dot m$ - mass-flow through the machine (same for input and output) $p_{1}$ - input pressure $...
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3answers
144 views

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 ...
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2answers
278 views

Mechanical Linkage Question - Velocity Diagram

Can someone confirm the velocity of B, given point C has velocity of 3 units/s down and point A has a velocity of 5 units/s upwards? My approach has been to resolve for the tangent velocity component ...
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1answer
5k views

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?
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3answers
3k views

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 ...
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6answers
23k views

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 ...