Abstract
Consideration is given to the basic principles of supercharging and the advantages and/or drawbacks of using surplus exhaust energy to drive the supercharger.
A review is given of the application of the exhaust turbo-charger to high-speed engines of the road vehicle type. It is shown that there are now in existence units which can be mounted without adding appreciably to the overall bulk and weight of the engine, and which enable the latter to develop brake mean effective pressures of up to 140 lb. per sq. in. without undue smoke. Torque and acceleration characteristics are considered and limitations vis-à-vis positive displacement blowers are briefly surveyed.
Lessons to be learnt from large engine practice are then reviewed, particularly from the standpoint of charge cooling. The Miller and Bone systems are briefly described.
The trend of development towards higher pressure ratio turbo-chargers is then considered, together with the possibilities of incorporating in the engine design improved pistons and fuel-injection systems.
The paper concludes with a brief reference to the present position and practice of turbo-charging two-cycle engines.
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