ORIGINAL: erazz
ORIGINAL: Bob R2
Model Turbine engines have a long way to go before they reach the level of perfomance that can and has already been achieved in 4'' diameter sizes. I have seen compression ratios of 6:1 and 300N thrust at FSC of 0.02 g/N/s in KJ sized package, using ceramic NGV and turbine, 600N with 2000 deg EGT.
Mainly the compressors and diffusors are radically different from the current CFD ''optimised'' designs. Combustors are simple but also very different.
Andre Baird
Will this technology make its way into model turbines and at what price?
Some might and some probably won't. The only ceramic material I'm aware of that has the required strength to withstand the stresses of rotation is carbon-carbon. The same material that makes up the leading edges of the space shuttle. Really expensive stuff.
Supersonic compressors are neat but have their limitations in our use.
Some might
A lot of reasearch has been done in the last 5 years which has turned conventional wisdom re compressor difussor design on its head. Some of it was known decades ago in the soviet block and has found its way into small missile engines. There is no reason why a reworked design with the technology we already use cannot produce 240N in a KJ size engine with close to half the fuel consumption. Its a question of know how. Add ceramics and youre talking 600N...
The truth is current compressors barely works as it is. CFD tools available to the public are not good enough to hint at this. Their flow predictions are just way wrong.
Andre