Investigation on a New Mechanical Supercharger - Scroll Supercharger

A new mechanical supercharger-a low compression ratio scroll compressor was introduced in this paper, including the principle, scroll geometry, suction volume, inner compression ratio, etc. Then the advantages of the scroll supercharger were pointed out compared with other superchargers. After some concrete design considerations, a prototype was made and the performance tests showed the results and prospect of scroll superchargers. INfRODUCfiON As we have seen, an internal combustion engine converts some of the energy released during combustion process to useful work; however, there is an upper thermodynamic limit to the efficiency of convertion and a practical limit to the degree of success in approaching the thermodynamic efficiency, the power produced by an engine is approximately proportional to the quality of fuel burnt, and the latter is controlled by the air supplied to the engine. In naturally aspirated four -stroke engines the quantity of air is proportional to the volume swept by the piston (or some percentage in excess in two-stroke engine). In order to increase the air supply an external air source is required. When this is provided ,fue engine is said to be supercharged. One of the methods is provide a separate pump to supply air to the engine. the air pump may be driven from the crankshaft or connecting rod or by a separate