OK mass flow rate. Can we ball park that?
-------- Original Message --------
Subject: [AR] Re: Turbopump prime mover
From: "Monroe L. King Jr." <monroe@xxxxxxxxxxxxxxxxxx>
Date: Tue, December 01, 2015 11:05 pm
To: arocket@xxxxxxxxxxxxx
So working backwards
30hp@58000 RPM= 2.72 ft/lbs torque
What is m_dot?
I guess Ve is velocity exhaust
-------- 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.