Supercharger exit port - is this a NACA duct?
Supercharger exit port - is this a NACA duct?
(OP)
The newer Eaton MP blower no longer uses a simple triangle for a discharge port, like this shown on an older M62

But now resembles a NACA duct, like this MP62:

1. is this correct?
2. not only is the area different (perhaps smaller) and L/W ratio far different, and covers a different proportion of the exposed rotors, but it doesn't have a floor? How does this work?
But now resembles a NACA duct, like this MP62:

1. is this correct?
2. not only is the area different (perhaps smaller) and L/W ratio far different, and covers a different proportion of the exposed rotors, but it doesn't have a floor? How does this work?





RE: Supercharger exit port - is this a NACA duct?
RE: Supercharger exit port - is this a NACA duct?
Mike Halloran
Pembroke Pines, FL, USA
RE: Supercharger exit port - is this a NACA duct?
RE: Supercharger exit port - is this a NACA duct?
RE: Supercharger exit port - is this a NACA duct?
RE: Supercharger exit port - is this a NACA duct?
RE: Supercharger exit port - is this a NACA duct?
Similar discharge port shapes are also used on lysholm compressors, but the difference is that the lysholm device is a true compressor (ie. it achieves compression of the air within the rotor confines) and that port shape/location helps define the pressure ratio of the device. Where as the roots type supercharger shown, is only a positive displacement device (ie. it does not achieve any compression of the air within the rotor confines). It produces elevated intake pressure by simply pumping more air volume into the intake manifold than the engine would normally use under ambient conditions.
RE: Supercharger exit port - is this a NACA duct?
Re: "straight-lobe-profile-rotor".
I see that you're not familiar with Eaton. The MP62 (and all others in the M series) have 60° helixed rotors.
RE: Supercharger exit port - is this a NACA duct?
Can anyone, er, shed more light on it?
Mike Halloran
Pembroke Pines, FL, USA
RE: Supercharger exit port - is this a NACA duct?
Thanks for the clarification. You're right, I'm not intimately familiar with the MP62 supercharger shown, and I do understand that most current roots blowers now use a helical rotor shape. I just took a quick glance at that photo and mis-took that inner casing edge for a straight rotor edge.