Combustor math.

[ebweiss2]

Planning a hybrid axial centrifugal engine similar to many turboshaft helicopter engines. I've seen math for a single turbocharger combustor, but where do I find it for my setup? And I'm thinking of going annular combustor.

[racket]

Hi

Theres really no "difference" , we still need to adhere to certain parameters like flametube cross sectional area and length/diameter or length/width ratios

Firstly , don't attempt to do an axial/centrifugal setup , you'll be be doomed to failure before you start , small turboshaft heli engines have ditched the axial section and are going to single high pressure radial comp wheels .

An annular flametube needs to have a L/W ratio of at least 2:1 to minimise "problems", preferably closer to 3:1

If this is going to be your first engine build , then I'd recommend you keep it as simple as possible .

All the best with the build , if you need more answers , ask away :-)

Cheers
John