Help needed for calculating Specific Impulse
I recently work on nozzle flows of various geometries by CFD method. Reading related papers, I found that Isp(specific impulse) of nozzles is expressed by the ratio of an ideal specific impulse. I'm wondering how we obtain the idela specific impulse of a given nozzle. Plz, suggest me the method or related papers and books. Thanks in advance.
Re: Help needed for calculating Specific Impulse
By definition specific impulse is
where T is total thrust and mf is the mass of expelled propellent. Now the calculation of thrust depends on which kind of propulsion you use. For example if your nozzle is for a rocket system, then (in adapted condition : pext=pamb)
T= mf Vext
where Vext is the exhaust velocity that depends essentially from which kind of fuels and oxydizers you use. For this case is obviously
This is valid ONLY for rocket system. If you need more informations mail back. Bye.
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