Gray relational analysis for effect factors of diesel spray penetration length
1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, Hunan 410082, China; 2. College of Mechanical and Vehicle Engineering, Hunan University, Changsha, Hunan 410082, China; 3. North China Institute of Engine, Tianjin 300380, China
Abstract：Due to the important effects of fuel injection, atomization, evaporation and mixing process with air on combustion and emission characteristics of engine, the main feature size of penetration length of diesel spray was taken as research object. The effects of injection pulse width, injection pressure and back pressure in constant volume bomb on diesel spray were experimentally investigated by schlieren imaging technology. The impact of three factors on spray penetration length was also analyzed by gray relation theory. The results show that the spray penetration length is decreased with the increasing of back pressure under the same injection pressure and pulse width, while it is increased with the increasing of injection pressure under the same back pressure and injection pulse width. The injection pressure has the greatest impact on spray penetration length with less effects of back pressure and injection pulse width.
2017, Vol. 38 
