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"Alain" <ele### [at] netscape net> wrote in message news:45833d66
> Plasma or ion engines, indeed, don't show overexpansion. The reason is
> that the plasma have very neglegible pressure. It don't have presure as
> it's not accelerated by the presure but by magnetic and electric fields. I
> was thinking more about chemical or nuclear powered rocket engines.
Egg-zactly. :^)
> In those cases, the exaust have a prety high residual presure as it leave
> the engine, and that residual presure is what causes the overexpansion.
>
> Alain
Ideally, rocket nozzles are designed so that the flow is optimally expanded
over the altitude range (pressure range) it operates in. You can't "have it
all".
Jon
--
Jon S. Berndt
Aerospace Engineer
Houston, TX
--
Editor, Horizons, AIAA Houston
http://www.aiaa-houston.org/horizons
--
Project Development Coordinator, JSBSim
http://www.jsbsim.org
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