Description and Laboratory Tests of a Roots Type Aircraft Engine Supercharger (1926)
NASA Technical Reports Server (NTRS) · leaf 8
nute. The various pressure ratios were obtained by varying the inlet pressure, the dis- charge pressure being held nearly constant. The actual PUns were made at constant weights of air handled, the desired pressure ratios being obtained by varying the speed of rotation and the opening of I he inlet… … Drive shaft R.P.M. Fig. 6. -Power, efficiency, and air delivery ()|' Fahrenheit. The coefficient used was that given by l)urley, but modified as indicated by a series of ex- periments made to determine the effect on the orifice coefficient of causing the (low to take place in the reverse direction…
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