06/22/2004

For those who might like to diddle with the doohicky wheels...

Effect of various methods of boundary-layer control on performance of
V-1710-93 engine-stage supercharger 
Kohl, Robert. C. , Diggs, Donald. R. , Lewis Flight Propulsion
Laboratory. 
NACA Research Memorandum E6L19, 14 pp. , 1947 
Four methods of boundary-layer control were tried during an
investigation to improve the flow in the impeller passages of a
V-1710-93 engine-stage supercharger. The boundary layer along the
impeller front shroud was removed by suction. In one method the removal
was accomplished by recirculation of the air to the impeller inlet; in
another method, by external removal. In the other methods, slots were
cut through the impeller-blade faces first at 30 percent and then at 30
and 70 percent of the mean-flow-path length measured from leading edges
of the rotating inlet guide vanes to introduce air from the
high-pressure side of the blades into the region where stagnation and
separation were suspected. 
http://naca.larc.nasa.gov/reports/1947/naca-rm-e6l19/ 


And for those who can drill a few holes - chill the egt by up to 150f  ?

Comparative effectiveness of a convection type and a radiation-type
cooling cap on a turbo-supercharger. 
Hartwig, Frederick J , Jr , NACA Aircraft Engine Research Laboratory
(Cleveland, Ohio., United States) 
NACA TN-1082, 8 pp. , 1946 
No Abstract Available 
http://naca.larc.nasa.gov/reports/1946/naca-tn-1082/ 


And for the math types.....  Note the acknowledgements.

A method of determining the equilibrium performance and the stability of
an engine equipped with an exhaust turbosupercharger 
Rea, James Buchanan (Massachusetts Institute of Technology) , NACA 
NACA TN-831, 43 pp. , 1941 
The performance of an exhaust turbine driving a supercharger is
investigated by means of a sample calculation based on reasonable
assumptions for the purpose of determining whether the assumed
installation is stable with respect to changes in the mass of gas
handled, boost pressure, etc. The arrangement was found to be stable
throughout the entire range of operation. The method developed can be
generally applied. 
http://naca.larc.nasa.gov/reports/1941/naca-tn-831/