새로운 개념의 로터리엔진 초기 프로토타입을 제작하고 작동성 확인을 위한 모터링, 압축기 압력 및 연료 연소시험을 수행하였다. 기존 피스톤 엔진 및 반켈 로터리엔진과의 비교 분석을 통해 이 신개념 로터리엔진의 장 단점과 활용분야를 조사한 결과 이 엔진은 소형 항공기에 가장 적합하고, 이륜차와 휴대용 및 하이브리드 자동차용 Genset에도 기존 엔진보다 적용성이 더 좋을 것으로 파악되었다. New concept rotary engine initial prototype has been developed. Engine motoring, compressor pressure and fuel combustion were tested for engine mechanism and operability check. Merits and demerits, applicable areas of the engine have been investigated against reciprocating and Wankel rotary engines. It was found that this engine is best fit for small aircraft and it is better than existing engines for motorcycle, portable and hybrid car Genset too.
Performance characteristic of a new type rotary internal combustion engine was investigated analytically. The new type rotary engine named as Separate type Rotary Engine consists of a compressor, an expander, and an air path. Engine cycle analysis program developed for the SRE was utilized as a performance analysis tool and the effects of the three SRE design parameters such as the ratio of air path volume to combustion chamber volume, air path cooling, and over expansion ratio on the engine performance have been studied analytically. It was found in this study that although the air path from compressor to combustion chamber is indispensable, it is better to be as small as possible for engine performance. Air path cooling is a good method to increase power output in the limit of max combustion chamber temperature even at some cost to the thermal efficiency. Ease of getting over expansion in the expander is a special feature of this SRE and it is possible because compression and expansion do not occur in one cylinder, but in two separate cylinders, a compressor and an expander. As the expansion ratio increase, thermal efficiency was increased and as a result, the power output also increased. Within the limit of this study, 15% increase of expansion ratio has resulted in about 5% increase of thermal efficiency, as well as power.
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