부탄올의 분사 및 분무특성에 관한 실험적 연구
An experimental study on the injection and spray characteristics of butanol
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본 연구에서는 자체 제작한 Zeuch법 분사율 측정장치와 고압분무 가시화 실험장치를 이용하여, 상온의 분위기압력 3 MPa 하에서 100, 130 MPa의 분사압력으로, 경유와 부탄올을 분사하여 분사특성인 분사율 및 분사시작점과 분사기간, 분무의 거시적 특성인 분무도달길이, 분무각, 분무속도 등과 분무의 발달 형태와 고밀도 액적영역의 분열과정을 분석하였다. 실험의 결과, 경유와 부탄올은 비중과 점도가 약간 차이가 있었으나 두 연료의 분사특성과 거시적 분무특성은 거의 유사하였다. 본 연구 결과는 디젤기관의 대체연료로서의 부탄올 사용에 관한 기초 자료를 제공할 수 있을 것으로 생각된다.
Abstract
Butanol has an ability to improve the ignition quality due to its lower latent heat of vaporization; it has an advantage to reduce a volume of a fuel tank because its energy density is higher than that of ethanol. Also, butanol-diesel oil blending quality is good because butanol has an effect to prevent the phase-separation between two fuels. Even if the blended oil contains water, it can reduce the corrosion of the fuel line. Thus, it is possible to use butanol-diesel oil blended fuel in diesel engine without modification, and it may reduce the environment pollution due to NOx and particulate and the consumption of diesel oil. Therefore, some studies are being advanced whether butanol is adequate as an alternative fuel for diesel engines, and the results of the combustion and exhaust gas emission characteristics are being presented. Though the injection and spray characteristics of butanol are more important in diesel combustion, the has not yet dealt with the matter. In this study, the influence in which differences of physical properties between butanol and diesel oil may affect the injection and spray characteristics such as injection rate, penetration, spray cone angle, spray velocity and process of spray development were examined by using CRDI system, injection rate measuring device and spray visualization system. The results exhibited that the injection and macroscopic spray characteristics of two fuels were nearly the same.
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