GCI 조건에서 정적연소기를 이용한 가솔린 바이오디젤 혼합의 분무 및 연소 특성에 관한 연구

Abstract

This paper investigates the physical properties of spray development and combustion characteristics using the gasoline - biodiesel blend in the Gasoline compression ignition (GCI) engines simulated using the Constant volume combustion chamber (CVCC). There are few studies on the spray and combustion characteristics of ignition delay of gasoline and biodiesel blended by optical investigation. In this work, we performed a comprehensive study focused on the spray characteristics and ignition delay of the GB blended under a wide range of experimental conditions simulating engine operating conditions. Gasoline (90%)-biodiesel (10%) blended, gasoline (80%)-biodiesel (20%) Blended and pure gasoline were used as fuel in this study. Spray characteristics including spray development, spray cone angle and spray penetration length were investigation, and the results are in line with the trend of the previous studies. The results are evaluated based on images analyzed from the spraying process under injection pressure ranging from 400 to 900 bar. At same injection pressure and during the same injection duration, GB has spray impingement faster than gasoline. In addition, according to the spray penetration length experimental results can be obtained that when the injection pressure increase, the time of spray impingement is shortened. Other parameters that are essential factors influencing ignition delay, such as ambient gas density, and ambient temperature, were also investigated. These results provide data support for the optimization and improvement of the combustion process of GB blended fuel under GCI engine conditions and lay the foundation for application to the next generation of engines.