> >This is a very incomplete drawing, and it is a cross sectional. My next >step is to find a mesh generator package and start finding the problems >with combustion and exhaust flows in the geometry, modify the curves >accordingly, then start thinking about how to actually build it and hold >the plug in place. > >Dave
IMHO, doing CFD is going to be a complete waste of time. For instance, what is the difference between a 15 degree cone and a perfectly calculated bell nozzle? 2%? That is a difference that will be swamped by catalyst pack issues and experimental error. You mention combustion, but we are still talking monoprop here, correct? As we are learning with our biprops, combustion does not always happen where you think it is going to, and your simulations are only going to be as good as your initial assumptions about conditions, which aren't going to be all that good. Build and test something to get some baseline data, then you can try and improve it if you feel it necessary, at which point you will be able to tell if the CFD was doing anything related to reality at the better / worse scale. Regarding performance, I would be very interested in seeing some simulations of expected performance for a low chamber pressure + altitude compensating nozzle versus a high chamber pressure fixed nozzle. I may run some of these myself if nobody beats me to it. John Carmack _______________________________________________ ERPS-list mailing list [EMAIL PROTECTED] http://lists.erps.org/mailman/listinfo/erps-list
