Very Small Exhaust Hole

[Bhuvan Aerospace]

The intake compressor diameter is 2 cm
And The exhaust Turbine diameter is 2.5 cm. I measured that.

[racket]

That size turbo will be very hard to even get going , thrust output will be negligible :-(

The KJ66 engine www.gtba.co.uk/engine_designs/kj66.htm has a 47 mm inducer on the comp

[Bhuvan Aerospace]

The KJ66 has an inducer which is double than my one. But I dont have enough budget to buy another Turbocharger. Please help me sir. I need 22 lbs thrust at any cost.

[racket]

Sorry , but without more mass flow you can't get the thrust ...............We can't bend the Laws of Physics :-(

Turbines are an expensive hobby , thats just a fact of life .

For 22 lbs of thrust you'll need a comp with at least a 50mm inducer

[Bhuvan Aerospace]

Sir, can you tell me about the maths and calculations for making the flame tube(Diameter of flame tube, its length , Diameter of Primary, Secondary, Tertiary holes etc) ?? Because I have done some mistakes about the maths.

[racket]

Use Jetspecs calculator www.nuclearprojects.com/jetspecs_archive/

[Bhuvan Aerospace]

It is wrong. It is showing that flame tube diameter is 3 times the Inducer. But it is actually 2 times I heard in YT on the Colin Furze Channel. Please tell me the maths sir.

[Bhuvan Aerospace]

I just found out that Flame tube will be 4 cm as inducer diameter is 2 cm and length will be 12 cm and Primary hole’s area will be 30% the area of the inducer. So diameter of Primary holes is 2.2 mm x 26 holes and Secondary hole’s area is 20% the area of the Inducer. So diameter of the secondary holes is 4mm x 5 holes and Tertiary hole’s area is 50% the area of the inducer. So diameter of the tertiary holes is 6.4 mm x 5 holes. The combustor diameter is 4+1+1 cm - 6cm. Is the calculations correct sir?

[racket]

Hi

The reason its 3 times for you is because you have a small turbo , when I did the maths for Jetspecs a long time ago , I purposely made small ones 3 times, and ones bigger than 50 mm inducer , 2 times for a number of reasons which I won't go into here as I don't want to be typing for another hour, ...............thats why Jetspecs was created ...............just use it !!!

[Bhuvan Aerospace]

The hole diameter will be same or it will be also increased?

[Bhuvan Aerospace]

I inputted 6 cm as my inducer diameter in jet specs just to test. But is showing flame tube diameter- 18cm but it should be 12 cm as it is more than 5cm.

What if I make the flame tube 2x the diameter of the inducer and not the 3x? Will it work?

And what metal should I use to make the flame tube and combustor such that it can be welded and also will not melt and explode??

[racket]

LOL...............thats quite possible , as I said it was a long time ago.

I've advised you to use Jetspecs , its up to you if you don't want to , the outcome is then your responsibility , not mine .

Use steel , preferably stainless for the flametube , but both of which can still melt in a turbine engine if its not constructed/operated correctly .

I seriously doubt you'll even get the engine to operate successfully using such small rotative parts in a turbo ...................but then , what would I know .

[Bhuvan Aerospace]

Sir about what you said “LOL…. That’s quite possible “? And also sir, I trust you and JetSpecs and will always follow you !! And also sir, can stainless be welded? And the dimensions for the Primary, secondary, tertiary will remain same if the flame tube diameter is increased?

[enginewhisperer]

Unfortunately there is no way you will get enough thrust from a turbine engine of this size, and it will be very heavy if it is based on a turbocharger.

There is no chance you will hit 500km/h in an RC plane with this style of engine even if you build a larger one and get it work extremely well.

[Bhuvan Aerospace]

Reply to my question sir