EFFECTS ON PERFORMANCE OF CHANGING THE DIVISION OF WORK BETWEEN INCREASE OF ANGULAR VELOCITY AND INCREASE OF RADIUS OF ROTATION IN AN IMPELLER

摘要

The effect on the performance of increasing the angular velocity of an impeller and consequently increasing the amount of work of compression resulting from the angular acceleration of the air in the impeller was investigated for four impellers in combina¬tion with a vaneless diffuser in a variable-component supercharger test rig over a range of actual tip speeds from 800 to 1300 feet per second. Impellers A, B, and C were also tested at two constant impeller angular velocities.nImpellers A, B, and C consisted of radial-bladed sections with the same inducer section. Impellers B and. C were made by reducing the discharge-tip diameter of impeller A (12-in. diameter) to 10.76 inches (impeller B) and to 9.52 inches (impeller C). Impeller D consisted of the inducer section without a radial-bladed section.