On Mon, 2002-09-09 at 00:31, Pierce Nichols wrote: > Why not use a straight cylindrical outer skirt and put all of the > shape in the plug? The throat location is then obvious. >
Cause then it would be too simple and I wouldn't have gotten to know TurboCAD as well. :-) > > >3. It looks like (from what little I have found) the "ramp" geometry is > >fairly important to getting good performance and the proper flow fields. > >The ramp on my drawing is pretty much wrong, I think. A NASA-AIAA paper > >that I found uses a flow 28-34 deg off the center axis at the throat and > >a cubic spline curve for the ramp. > > > I seem to remember a couple of references indicated that a > straight conical spike is almost as good as a fancy shaped one. It's > certainly cheaper to make and easier to design. Okay, good. I couldn't find many references, but the NASA-AIAA paper on parametric design of plug nozzles seemed to indicate worthwhile improvements between the very simple design and a more "refined" design. Dave _______________________________________________ ERPS-list mailing list [EMAIL PROTECTED] http://lists.erps.org/mailman/listinfo/erps-list
