- Jan 26, 2022
- Reaction score
I am fascinated by your project. Considering the exhaust from your burner: and the coanda effect nozzles....
The momentum exchange of moving gases reacting on the host vehicle causes thrust. So if the host vehicle generates a lot of low pressure hot gas, made of larger molecules than N2 and O2 in air, then it may be a good idea to inject this gas into the coanda nozzle. The basis is that this gas is initially a part of the vehicle, so when accelerated and ejected from the nozzle will add to the momentum ejected backwards, thus increasing the momentum reaction force forwards....
If so, perhaps it should be in the form of a De Laval nozzle in the middle of the coanda nozzle, and thus the exhaust gas jet can enhance the mass of air drawn through the coanda nozzle, utilising the last of the heat energy in the exhaust as it expands and cools adiabatically through the nozzle...?
Sorry if this is a crazy idea, but perhaps worth considering?
Hmmmm, that's an interesting idea. As the exhaust gases exit the boiler I could easily rout them into the intake of the large centrifugal compressor, where they would be mixed with a much larger volume of ambient air.
Your idea of using a De Laval nozzle to shoot high velocity air into the middle of the Coanda nozzle is very similar to what was done on the XFV-12 program; below is a diagram of the Augmenter Geometry they used. The structure in the top middle of the diagram is a nozzle.
If you look closely at the first diagram I posted, you'll see a similar set of shapes as the one above, in the upper right portion of my drawing.