1992-02-01

Appraisal of Regenerative Blowers for Scavenging of Small 2T S.I. Powerplants 920781

The nowadays two-stroke engine technique is directed toward new concepts to reduce fuel consumption and pollution.
Typical features are direct injection of fuel and no lost oil lubrication: a separate scavenging system is becoming so a must.
Following general consideration about different scavenging pumps, a regenerative blower solution is proposed. Regenerative blowers present in fact several advantages in comparison with other solutions like simplicity in construction and on engine fitting, no maintenance and low cost.
An exhaustive experimental evaluation was carried out on a direct injection two-stroke S.I. engine with a separate scavenge, already described in a previous work by one of the authors.
The results show the practical feasibility of the proposed solution. In fact, the regenerative blower is suitable to match the engine air breath demand all over its utilization range.
Concluding remarks relative to possible layout for light powerplants, like small vehicles and marine engines, are presented in the last part of the present paper.

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