Requirements to self-sustain

[repairman285]

I am very much interested in building a turbojet engine using a turbocharger.

My main question now is if the turbocharger listed below will self-sustain.

What are the required specs for it to self-sustain?

Any comments are much appreciated. Thank You.

Several of these are listed on eBay.

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TURBOCHARGER: GT3582

FEATURES:

Compressor Size:

⦁ * Inlet(Air Intake): 4"(103.5mm)

⦁ * Outlet: 2.5"(64.7mm)

⦁ * Trim: 56

⦁ * Inducer Diameter: 61.5mm

⦁ * Exducer Diameter: 81.5mm

⦁ * A/R: 0.7

Turbine Size:

⦁ * Exhaust (Turbo Manifold) Flange: T3 4-Bolt Flange

⦁ * Exhaust (Downpipe) Flange: 4-Bolt Flange

⦁ * Trim: 84

⦁ * Inducer Diameter: 68mm

⦁ * Exducer Diameter: 62.4mm

⦁ * A/R: 0.63

Cooling Type:

⦁ Water and Oil Cooled

⦁ Oil Thread Size: W14*1.5

⦁ Water Thread Size: W8*1.25

⦁ Dimensions(length width Height)：230*180*240mm

⦁ Horse Power: Boost Horse Power up to 600BHP

⦁ Bearing Type: Journal Bearing

⦁ Universal, for turbo manifold with T3 flange.

[CH3NO2]

Dont listen to me because I'm a n00b... but... your turbine exducer should have a outlet area ~25% greater than the inlet area of the compressor inducer. And the turbine housing A/R should be around ~1.5 for nominal performance as a gas turbine.

One of the experts here could give you a much better evaluation but it may be difficult to run that turbo as a turbine. It's likely to encounter surge. Surge is a condition where the compressor is trying to supply more air flow than the turbine can flow at the same pressure. There can be a mismatch between the flow capacity of the compressor and turbine sections and it becomes difficult to sustain.

It may be difficult to keep it running without experiencing overheating or surge.

[repairman285]

Looks like the turbocharger I'm looking at isn't even close to being usable. This is a lot more than I knew before. I'll watch for more replies. I came across the flame tube calculator at www.nuclearprojects.com/jetspecs/flametube.php. It looks very helpful. I know this is critical for proper operation.
Thanks for the quick reply, Gene

[Johansson]

Hi Gene!

Ideally you want a turbo coming from a diesel engine, they tend to have a larger turbine section and therefore be more suited for a gas turbine than the "petrol turbos" with their generally smaller turbines.

Read through this guys website and you will probably have most of your questions answered.

www.rcdon.com/html/gr-1_turbojet_engine_project.html

Cheers!
/Anders

[repairman285]

Anders, Thanks for the info. The website you referred to has a lot of information.
It did answer a lot of important questions.
I will research many websites to get more info.
The "jetspecs" website looks very good for constructing the flame tube.
Thanks, Gene