摘要
根据不稳定性理论，将燃烧室中油滴破碎过程分为ＫＨ不稳定破碎和ＲＴ不稳定破碎；根据Ｗｅｂｅｒ数将喷雾碰壁过程分为粘附、反弹粘附和飞溅附壁射流３ 种模式，建立了油滴破碎和喷雾碰壁的数学模型。根据油滴破碎模型计算所得的喷雾贯穿距离和ＳＭＤ值同试验结果相一致，喷雾碰壁模型计算所得的油滴位置图形与高速摄影结果相一致。将已被试验验证后的模型应用于涡流室式柴油机中， 计算了涡流室内喷雾的发展过程，计算结果与高速摄影结果吻合良好。
According to instability theory the process of fuel droplet breakup in the combustion chamber is divided into Kelvin Helmhotz (K H) instability breakup and Rayleigh Taylor (R T) instability breakup.Based on Weber number,the process of spray impingement is divided into three independent models:stick,rebound/stick and splash/tangential jet.The mathematical models of the fuel droplet breakup and the spray impingement are established.The spray penetration and SMD calculated from the droplet breakup model are agreed with experimental data.The proposed spray impingement model predicts spray impingement patterns that agree with the results shown by high speed photography.Furthermore,the models are applied to the real process in a swirl chamber diesel engine and the process of spray development in the swirl chamber is calculated.The results calculated are in good agreement with those of high speed photograph.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
1999年第4期317-322,共6页
Transactions of Csice
基金
国家自然科学基金
关键词
涡流室
柴油机
油滴破碎
喷雾碰壁
数值模拟
Swirl chamber diesel engine
Fuel droplet breakup
Instability
Spray impingement
