80kg engine

[finiteparts]

Are there any part numbers?

[WilliamTQ]

Trying to get more information on it, any good? For a compressor wheel?

[finiteparts]

It is a great compressor wheel....better aero-design, materials and mechanical strength than any cast or milled turbocharger wheel....but it is best for what is designed to do in an APU....will it be good for your application? Maybe. It will require calculations to match it to whatever turbine you select and you may be forced to use some inlet guide vanes (IGVs) due to the shallow inducer angles. It is likely titanium, not due to temperature requirements, because typically APUs run at lower PRs, but for the low cycle fatigue lifing requirements that drive the need for a more capable material.

Generally, the shallow angle suggests a relatively low shaft speed, thus low pressure ratio. Since it is likely a second stage, the stage loading is lower than what would be done with a single stage impeller. Now, it is very hard to identify Garrett impellers from a few pictures because they have so many variants and engines that share similar aero-technology, but if that is from a GTC-85 series engine, they produce pressure ratios of 3.25 to 3.7 across BOTH stages of the impellers, which is a relatively lightly loaded compressor ratio for a centrifugal compressor. They due this because they often are used as huffers and the map width required is significant. When it is not pumping compressed air out the bleed, it's mass flow is limited by the turbine stage, but when the bleed valve is open, there is a significant increase in mass flow demand.

Good luck,

Chris

[WilliamTQ]

Mar 26, 2023 17:58:45 GMT -5 finiteparts said:

It is a great compressor wheel....better aero-design, materials and mechanical strength than any cast or milled turbocharger wheel....but it is best for what is designed to do in an APU....will it be good for your application? Maybe. It will require calculations to match it to whatever turbine you select and you may be forced to use some inlet guide vanes (IGVs) due to the shallow inducer angles. It is likely titanium, not due to temperature requirements, because typically APUs run at lower PRs, but for the low cycle fatigue lifing requirements that driving the need for a more capable material.

Generally, the shallow angle suggests a relatively low shaft speed, thus low pressure ratio. Since it is likely a second stage, the stage loading is lower than what would be done with a single stage impeller. Now, it is very hard to identify Garrett impellers from a few pictures because they have so many variants and engines that share similar aero-technology, but if that is from a GTC-85 series engine, they produce pressure ratios of 3.25 to 3.7 across BOTH stages of the impellers, which is a relatively lightly loaded compressor ratio for a centrifugal compressor. They due this because they often are used as huffers and the map width required is significant. When it is not pumping compressed air out the bleed, it's mass flow is limited by the turbine stage, but when the bleed valve is open, there is a significant increase in mass flow demand.

Good luck,

Chris

Trying to build 70kg-80kg engine for my kart, I have built a turbocharger jet engine before but didn’t want to build out something like hx82 for a kart just too heavy, wanted rc jet type engine for it 

[racket]

Hi

A kart engine , OK , we're getting somewhere :-)

Checkout this build , jetandturbineowners.proboards.com/thread/1025/hx-102-255-money-pit and read it in conjunction with the previous one I recommended

Its the least expensive option as the parts are readily available in the event of a development failure or two ;-)

Cheers
John

[WilliamTQ]

Compressor wheel okay then?

[finiteparts]

Two big downsides to that compressor.

1. If something happens to it, a compressor rub or FOD, it will be hard/expensive to replace...unless you bought multiples....
2. It is very far from a standard turbocharger wheel...menaing it WILL require a lot of calculations to properly match it to a selected turbine stage. Rules of thumb may not get you to a running engine.

- Chris

[WilliamTQ]

Mar 26, 2023 18:46:04 GMT -5 finiteparts said:

Two big downsides to that compressor.

1. If something happens to it, a compressor rub or FOD, it will be hard/expensive to replace...unless you bought multiples....
2. It is very far from a standard turbocharger wheel...menaing it WILL require a lot of calculations to properly match it to a selected turbine stage. Rules of thumb may not get you to a running engine.

- Chris

Can help me with that? Turbine wheel 155mm

[finiteparts]

More than happy give pointers and help with specific calcs, but I am very limited on time. I realize that most of the posts (other than John's) do not include the calculations and so it is hard for new builders to find the path....we probably need to change that.

If you're not in a rush, maybe we can use this as a post with which to highlight all the basic calculations needed to do the matching. But as I said, I am very limited in how much time I can give, so it may be slow.

- Chris

[finiteparts]

Any specs on the turbine wheel?

[WilliamTQ]

Mar 26, 2023 19:34:06 GMT -5 finiteparts said:

More than happy give pointers and help with specific calcs, but I am very limited on time. I realize that most of the posts (other than John's) do not include the calculations and so it is hard for new builders to find the path....we probably need to change that.

If you're not in a rush, maybe we can use this as a post with which to highlight all the basic calculations needed to do the matching. But as I said, I am very limited in how much time I can give, so it may be slow.

- Chris

Hi Chris I’ve the time and loads of holes in my knowledge of jet turbine and compressor calculations, going need loads of help calculating and designing diffuser, combustion chamber size and holes,shaft length required as you can see I need help with everything. Would be great full for all input and advice from members. Here’s some better pictures of the compressor wheel I’ve gathered if from an APU you might be able to see the part numbers and give more some information on it 

[WilliamTQ]

Might need zoom in on pictures to see part numbers

[madpatty]

Mar 26, 2023 11:24:42 GMT -5 WilliamTQ said:

whats your thoughts on this compressor wheel?

The rotation is opposite(anti-clockwise)
Finding a suitable turbine will be difficult, maybe, because options are already limited.

Regards.

[WilliamTQ]

Mar 26, 2023 19:34:06 GMT -5 finiteparts said:

More than happy give pointers and help with specific calcs, but I am very limited on time. I realize that most of the posts (other than John's) do not include the calculations and so it is hard for new builders to find the path....we probably need to change that.

If you're not in a rush, maybe we can use this as a post with which to highlight all the basic calculations needed to do the matching. But as I said, I am very limited in how much time I can give, so it may be slow.

- Chris

I think this might be the part number for the impeller Honeywell Impeller P/N: 379548-50 any information would be appreciated 

[WilliamTQ]