At 09:05 PM 9/8/2002 -0700, David Masten wrote:
>1. The actual location and size of the throat is not obvious. Twice I
>dimensioned the spot where I thought the throat was to later find out
>that there was a smaller area downstream of it. (The first time was just
>a boneheaded DOH!, the second time was a subtle trick of conical
>geometry.)
Why not use a straight cylindrical outer skirt and put all of the
shape in the plug? The throat location is then obvious.
>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.
-p
Mars or Bust!
www.marssociety.com
_______________________________________________
ERPS-list mailing list
[EMAIL PROTECTED]
http://lists.erps.org/mailman/listinfo/erps-list
