Rotary mass flow rates

[kev-yorks]

In general the calculation for a turboed piston engine is 9.5 to 10.5 lb/min of flow per flywheel horsepower. Has anyone any idea what the figures are for a turboed rotary?
Kevin

[sdminus]

1.92 CFM per 1 RWHP

[MikeLMR]

at what pressure and temp is that ? volumetric flow rates are fairly meaningless.

[dubber91]

my thaughts exactly

volumetric flow rates are also dependent upon rpm and throttle configuration; hence, volumetric efficiency

Steve

[kev-yorks]

There will be some sort of general figure out there though, which is all i was after. No engine runs the same day to day,i was just after a ball park figure which it looks like Scott has come up with.
Kevin

[MikeLMR]

CFM isn\'t a good measure though as it will vary through the engine whereas massflow is almost constant from the air intake to the exhaust.

whats it all for anyway Kev

[Mave]

Rotary engine is going to be pretty much the same as a piston engine, maybe a bit higher as the engine is less efficient. If you went for 12 lb/min I doubt you\'d go far wrong.

[dubber91]

i concur.
Talking about stock motors of course.

[sdminus]

well a
GT42R flowing 84 lbs a min in a stock port rotary flows 1234 CFM this equates to 643 whp ish.

stock twin flows about 50lbs of air at peak flo = 382 whp

This and these formulae work for the rest of the world so i cant see a problem with them in the Uk !

 good luck with your project what ever it is

[MikeLMR]

about 6 - 7 lbs per hp from those examples then (well at the rear wheel)

[stuart wizy]

In general the calculation for a turboed piston engine is 9.5 to 10.5 lb/min of flow per flywheel horsepower. Has anyone any idea what the figures are for a turboed rotary?
Kevin

why the question , are u making custom inlet manifold for lots of flow??
pp even

[kev-yorks]

Lets just say there\'s a lot of little bits being played about with. Due to the nature of the beast a lot is trial and error so i\'ll be posting up next year when its all sorted as to what\'s been done and what has/hasn\'t worked.
Kevin

[sdminus]

the figures i quoted are for 2 rotor

[stuart wizy]

Lets just say there\'s a lot of little bits being played about with. Due to the nature of the beast a lot is trial and error so i\'ll be posting up next year when its all sorted as to what\'s been done and what has/hasn\'t worked.
Kevin

same goes for me mate, heres what my t45 will be flowing through:yes

[arrouk]

i think if you take the figure for a piston motor and divide by 1.3 it gives an approximate figure for a rotary, so 50 lb/min=500fwbhp/1.3=385rotary fwhp

matt