If Ve is Volumetric efficiency the turbochargers original VE is around
76% That will change I expect as this design is perhaps more impulse in
nature.
But I believe we can go with that because if I'm not mistaken impulse is
better. However the inducers in the turbine may effect it in a negative
way. So if it's VE go with 76%
the mass flow should be in the area of 30.26 lbs/min of air @30hp
any help?
-------- Original Message --------
Subject: [AR] Re: Turbopump prime mover
From: "Ed LeBouthillier" <codemonky@xxxxxxxxxxxxx>
Date: Tue, December 01, 2015 8:02 pm
To: "Arocket" <arocket@xxxxxxxxxxxxx>
Does anyone know any quick and dirty air pressure/flow calculations that
can be converted to HP?
Off the top of my head, I think that it's pretty similar to rockets. The
force on the turbine is
F = m_dot * Ve
But the Ve is really a factor of the difference in speed between the gases
and the turbine tip. It has to be calculated using the appropriate triangles
representing the impingement angles.
Once you know the force at the turbine tip, you can calculate the force
times the radius to get torque.
HP = RPM * Torque
Obviously, all of the units have to be the same magnitudes in the equations.