Yes.  You can see the open lobes around the PSRU and how they relate to
the cowling in the first two pictures.  The 3rd picture has the openings
highlighted.  The 4th is a picture of how my Harley-Davidson generator
is mounted and the space available for the impeller.  The impeller will
be both a blower and a mount for the generator.  The whole space between
the PSRU mounting plate and the engine is now enclosed in a shroud (I
really need to take a picture of that).  The shroud is not as tight and
technically correct as I would have liked, but it's good enough for a
proof of concept.  If I get good results from it, it will be something
to work on for improvements after I'm flying.

 

The fan (impeller) of the VW style has a covered face, so it does not need a shroud at all just a collector ring. It is also not required that a path or inlet gallery be used, so long as an open flow path is available.

 

It would of course, be more effiecient if it is exposed to a direct path for ram air, but it would work pretty well without it.  

 

In olden times us aircooled VW owners had no defrost or heating capabilities. You had to have a window rolled down a bit to let pressure out of the sealed passenger compartment. And even with this idea, heating was nearly nonexistant. The fix was to bore a 2" hole in the back bulkhead of the package shelf. Insert a piece of exhaust pipe tubing with three tabs bent out for pop revits. Sealed with silicone. The pipe extended into the opening of the blower shroud on the engine.

The low pressure thus produced resulted in massive amounts of hot air entering the passenger compartment, and defrost ducts. A small air filter clamped over the pipe opening calmed the roar of the fan.

 

Lynn E. Hanover