WilliamTQ
Member
Joined: March 2015
Posts: 38 
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Post by WilliamTQ on Mar 24, 2023 12:35:52 GMT -5
Hello after some information was wondering the size turbine wheel and compressor wheel inducer size I need or should be looking for to be able to achieve 80-100kg thrust output?
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Post by racket on Mar 24, 2023 16:07:08 GMT -5
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WilliamTQ
Member
Joined: March 2015
Posts: 38
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Post by WilliamTQ on Mar 24, 2023 16:49:51 GMT -5
Got any turbine wheels or compressor wheels?
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WilliamTQ
Member
Joined: March 2015
Posts: 38
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Post by WilliamTQ on Mar 24, 2023 17:08:37 GMT -5
Was reading the thread on your build,not finished reading but wow that was nice, is that kind of size compressor wheel I need. |
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Post by racket on Mar 24, 2023 17:54:47 GMT -5
For 100 kgs -220 lbs of thrust you'll be needing ~4 lbs/sec - 240 lbs/min of airflow if you don't want to force the engine too hard .
Generally we need 1 sq inch of inducer for a flow of 12 lbs/min , so an inducer of ~20 sq inches - 5"dia - 127 mm
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WilliamTQ
Member
Joined: March 2015
Posts: 38
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Post by WilliamTQ on Mar 24, 2023 18:52:21 GMT -5
For 100 kgs -220 lbs of thrust you'll be needing ~4 lbs/sec - 240 lbs/min of airflow if you don't want to force the engine too hard . Generally we need 1 sq inch of inducer for a flow of 12 lbs/min , so an inducer of ~20 sq inches - 5"dia - 127 mm Wow that’s big anything factory come with that size inducer? |
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Post by racket on Mar 24, 2023 20:37:34 GMT -5
Comps from tractor pulling turbos or heavy duty marine/locomotive stuff , very hard to find at a reasonable cost , take it from me , it ain't an easy path :-(
There are factory jets in the thrust size you want but they do cost a bit , it all depends on what you want the engine for and the depths of your wallet
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WilliamTQ
Member
Joined: March 2015
Posts: 38
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Post by WilliamTQ on Mar 26, 2023 2:46:33 GMT -5
For 100 kgs -220 lbs of thrust you'll be needing ~4 lbs/sec - 240 lbs/min of airflow if you don't want to force the engine too hard . Generally we need 1 sq inch of inducer for a flow of 12 lbs/min , so an inducer of ~20 sq inches - 5"dia - 127 mm Hi Racket can you tell me the kind of achievable kg output you expect to achieve with a 110mm inducer? |
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WilliamTQ
Member
Joined: March 2015
Posts: 38
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Post by WilliamTQ on Mar 26, 2023 3:17:58 GMT -5
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Post by racket on Mar 26, 2023 5:42:29 GMT -5
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WilliamTQ
Member
Joined: March 2015
Posts: 38
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Post by WilliamTQ on Mar 26, 2023 11:24:42 GMT -5
  whats your thoughts on this compressor wheel? |
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Post by racket on Mar 26, 2023 15:43:18 GMT -5
Something doesn't look right with the inducer , whats it out of ??
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WilliamTQ
Member
Joined: March 2015
Posts: 38
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Post by WilliamTQ on Mar 26, 2023 15:54:51 GMT -5
Will try and find out
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WilliamTQ
Member
Joined: March 2015
Posts: 38
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Post by WilliamTQ on Mar 26, 2023 16:00:38 GMT -5
Can you tell what you think doesn’t look right about it, I’m beginner when it comes to compressor wheel design, just been offered it, wanted your opinion on it
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Post by finiteparts on Mar 26, 2023 16:51:44 GMT -5
That looks like the second stage compressor wheel off of a Garrett APU...I am guessing that it is a GTC85 second stage wheel.
The inducer angle is very shallow (when measured relative to the inlet axial direction). For a first stage, the inlet angle is usually zero, i.e. fully axial. For a second stage impeller, there can be some residual swirl from the first stage that can make the inlet have a tangential component that is likely incorporated into the inducer blade angle.
- Chris
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