| 蒸发性对燃油瞬态喷雾撞击壁面的动态传热影响 |
| |
| 引用本文： | 周致富,张璐,游典,Safwan Hanis Mohd Murad,Richard Stone.蒸发性对燃油瞬态喷雾撞击壁面的动态传热影响[J].工程热物理学报,2021,42(1):232-238. |
| |
| 作者姓名： | 周致富 张璐 游典 Safwan Hanis Mohd Murad Richard Stone |
| |
| 作者单位： | 西安交通大学动力工程多相流国家重点实验室，西安710049;西安交通大学动力工程多相流国家重点实验室，西安710049；;重庆长安汽车股份有限公司，重庆400023;牛津大学工程科学系,牛津OX1 3PJ |
| |
| 基金项目： | 天津大学内燃机燃烧学国家重点实验室开放课题(No.K2019-04);陕西省国际科技合作项目(No.2019KW-021)。 |
| |
| 摘 要： | 直喷发动机燃油喷雾撞击壁面形成油膜,导致燃烧效率降低,颗粒物排放增加。伴随撞壁的动态传热过程对油膜蒸发具有重要影响。本文针对正戊烷、甲醇、甲醇汽油混合燃料瞬态喷雾撞击壁面,研究了不同条件下蒸发性对燃油瞬态喷雾撞击壁面动态传热影响。结果表明,提高喷油温度可促进燃油雾化,增大喷油压力或降低喷油距离可提高液滴撞壁强度,缩短液膜存在时间。撞壁瞬态温度与热流密度动态变化特征受燃油蒸发性与喷雾条件联合影响。
|
| 关 键 词： | 瞬态喷雾 液滴撞壁 动态传热 燃油蒸发性 GDI发动机 |
Effect of Fuel Volatility on Heat Transfer of Spray Impingement on Piston Surface |
| |
| Institution: | (State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China;Chongqing Changan Automobile Company Co.,Ltd,Chongqing 400023,China;Department of Engineering Science,University of Oxford,Oxford OXI 3PJ,UK) |
| |
| Abstract: | Fuel spray impingement on piston surfaces causes liquid film formation for Gasoline direct injection(GDI)engine,resulting in a reduction in combustion efficiency and increase in particulate emissions.Dynamic heat transfer has an impact on liquid film evaporation during fuel impingement.In this paper,the effect of fuel volatility on spray impingement heat transfer with n-pentane.methanol and methanol-gasoline mixture was examined.Results showed that increasing the fuel injection temperature helped to improve atomization of the fuel spray.An increase in injection pressure and a decrease in impact distance both increased impact strength,which led to a shorter liquid film lifetime on the surface.The dynamic characteristics of transient piston temperature and heat flux were jointly affected by fuel volatility and other spray conditions. |
| |
| Keywords: | transient spray spray impingement dynamic heat transfer:fuel vaporization:gasoline direct injection engine |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
