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질소 분사 압력이 액화질소 엔진의 성능 특성에 미치는 영향
신동길,Shin, Donggil 한국에너지학회 2017 에너지공학 Vol.26 No.1
액화질소 엔진은 유해 배출물질을 전혀 배출하지 않는 고청정 동력기관이며, 에너지 밀도면에서 배터리에 비해 크기 때문에 전기자동차에 대한 경쟁력을 가지고 있다. 기존의 액화질소 엔진은 주로 왕복동 방식에 국한되어 왔다. 본 논문에서는 스크롤 팽창기를 적용하는 액화질소 엔진의 개념을 도입하였다. 스크롤 팽창기를 엔진에 적용할 경우 엔진 효율이 증가할 수 있고, 구조의 단순화 구현이 가능하여 기존 왕복동 방식 엔진에 비해 기술적, 경제적 경쟁력을 가질 수 있다. 본 연구에서는 액체 질소 분사압력을 변화시키면서 스크롤 팽창기가 적용된 액화질소 엔진의 성능을 분석하였다. A liquid nitrogen engine is a highly clean power engine, which does not emit any hazardous substances in its fumes. Additionally, it has an advantage over electric vehicles, as its energy density is larger than that of a battery. The use of an existing liquid nitrogen engine is typically limited to the reciprocation type. In this study, the concept of a nitrogen engine equipped with a scroll expander is introduced. The engine's efficiency was shown to increase when the scroll expander was utilized in the engine, while also adding to the simplification of the structure. Therefore, compared to the existing reciprocation-type engine, the engine with the scroll expander has the potential to be both technically and economically more competitive. In this study, the performance of a liquid nitrogen engine equipped with a scroll expander was analyzed while altering the injection pressure profile of liquid nitrogen.
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김영민(Young Min Kim),신동길(Dong Kil Shin),이장희(Jang Hee Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
The Ericsson cycle is very much like the Stirling cycle, except that the processes of constant-volume regenerative heat transfer are replaced by constant-pressure regenerative processes. The efficiency of the Ericsson cycle is the same as that of the Carnot cycle, as in the Stirling cycle. But in the both cases, in spite of the high potentiality of the cycles, it is very difficult to realize the ideal cycle, because neither the isothermal compression nor isothermal expansion in the cylinder or with the turbomachinery is practical due to the insufficient heat transfer. In this paper, it was proposed that the scroll-type compressor and expander is fairly suitable for approaching the isothermal compression and expansion processes due to the area to volume ratio of scroll geometry and good gas to scroll heat transfer. And the thermodynamic characteristics of the proposed Ericsson cycle engine was investigated.
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유기 랭킨 사이클용 스크롤 팽창기 성능 시험에 관한 연구
문제현(Je-Hyeon Moon),박근태(Keun-Tae Park),김현진(Hyun-Jin Kim) 대한설비공학회 2014 설비공학 논문집 Vol.26 No.4
An algebraic scroll expander has been fabricated and tested in a R134a Rankine cycle with heat source of 20 kW. For the operating conditions of 20~26 bar and 90~93℃ at the expander inlet and 8~9 bar at the outlet, the expander produced the shaft output power of about 0.6~0.7 kW in the operating speed range of 1500~2000 rpm. These correspond to the expander efficiency of 40~45%. The volumetric efficiency increased with increasing of the expander speed, reaching to 80% at 2000 rpm. Comparing to numerical simulation results, mechanical efficiency from the test data was found to be considerably low by as much as 30%, indicating that reduction in the frictional loss should be made to improve the scroll expander efficiency.
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