Abstract
The most useful application of the mechanically driven supercharger is in the field of the smaller Diesel engine which operates over a wide range of speed, and especially where the duty calls for a high torque to be developed at low speed. Road vehicles and earth-moving plant commonly require these characteristics. In the interest of fuel economy a high adiabatic efficiency is of first importance in a supercharger so used. It is also desirable to be able to control the rate of air delivery from the supercharger to match the load on the engine; methods are discussed and test figures from the Fell locomotive propulsion engines are quoted. Where a simple fixed ratio drive to the supercharger is used a good volumetric efficiency at low speed and at the working pressure ratio is important in order that the boost at low engine speeds shall be high. The Ricardo wobble-plate compressor designed to meet these conditions is described and performance data are given. Overall performance figures of an engine when supercharged by this compressor are also included and the methods of applying the engine in vehicle service are discussed.
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Schedule a callMore From: Proceedings of the Institution of Mechanical Engineers: Automobile Division
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