| 제목 |
CNG 직접분사식 연소기에서의 열량해석(2) : 비균질급기 |
| 분야 |
전기동력자동차 |
| 언어 |
Korean |
| 저자 |
최승환(부산대학교), 전충환(부산대학교), 장영준(부산대학교) |
| Key Words |
Constant-volume combustion bomb(정적연소기), Inhomogeneous charge(비균질급기), Rate of heat release(열발생율), Analysis of heat quantity(열량해석), CHR ratio(CHR비; Cumulative heat release ratio), UHC ratio(UHC비; Unburned hydrocarbon |
| 초록 |
A cylindrical constant volume combustion bomb is used to investigate the combustion characteristics and to analyzer the heat quantity of inhomogeneous charge methane-air mixture. To analyze the heat quantity, some definitions including the CHR ratio, the UHC ratio and the HL ratio are needed and are calculated. It is shown that the effect of stratification is not significant in case of the overall excess air ratio of 1.1, mainly due to the higher heat loss and lower thermal efficiency compared to those of homogeneous condition. In the case of the overall excess air ratio of 1.4, as the initial charge pressure decreases, the CHR ratio has b en decreased while the HL ratio has been increased. Generally, as the initial charge pressure increases, the amount of injection mixture has been decreased and has resulted in lower mean velocity and turbulence intensity for injection mixture. Also, the injected mixture is too rich to result in mixing deficiency in combustion chamber. From these results, could be possible to acquire the improvement of thermal efficiency and the reduction of heat loss simultaneously through the 2-stage injection in CNG direct injection engine.{{br}} |
| 원문(PDF) |
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