期刊论文详细信息
FUEL 卷:290
Effects of ambient pressure and nozzle diameter on ignition characteristics in diesel spray combustion
Article
Ong, Jiun Cai1  Walther, Jens Honore1,2  Xu, Shijie3  Zhong, Shenghui3,4  Bai, Xue-Song3  Pang, Kar Mun5 
[1] Tech Univ Denmark, Dept Mech Engn, Nils Koppels Alle, DK-2800 Lyngby, Denmark
[2] Swiss Fed Inst Technol, Computat Sci & Engn Lab, Clausiusstr 33, CH-8092 Zurich, Switzerland
[3] Lund Univ, Dept Energy Sci, S-22100 Lund, Sweden
[4] Tianjin Univ, State Key Lab Engines, 135 Yaguan Rd, Tianjin 300350, Peoples R China
[5] MAN Energy Solut, Teglholmsgade 41, DK-2450 Copenhagen SV, Denmark
关键词: Spray flame;    Transported probability density function;    Ignition process;    Ambient density effect;    Nozzle diameter effect;   
DOI  :  10.1016/j.fuel.2020.119887
来源: Elsevier
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【 摘 要 】

Numerical simulations are performed to investigate the effects of ambient density (rho(am)) and nozzle diameter (D-noz) on the ignition characteristic of diesel spray combustion under engine-like conditions. A total of nine cases which consist of different rho(am) of 14.8, 30.0, and 58.5 kg/m(3) and different D-noz of 100, 180, and 363 mu m are considered. The results show that the predicted ignition delay times are in good agreement with measurements. The current results show that the mixture at the spray central region becomes more fuel-rich as D-noz increases. This leads to a shift in the high-temperature ignition location from the spray tip towards the spray periphery as D-noz increases at rho(am) of 14.8 kg/m(3). At higher rho(am) of 30.0 and 58.5 kg/m(3), the ignition locations for all D-noz cases occur at the spray periphery due to shorter ignition timing and the overly fuel-rich spray central region. The numerical results show that the first ignition location during the high-temperature ignition occurs at the fuel-rich region at rho(am)<= 30.0 kg/m(3) across different D-noz. At rho(am) = 58.5 kg/m(3), the ignition occurs at the fuel-lean region for the 100 and 180 mu m cases, but at the fuel-rich region for the 363 mu m nozzle case. This distinctive difference in the result at 58.5 kg/m(3) is likely due to the relatively longer ignition delay time in the 363 mu m nozzle case. Furthermore, the longer ignition delay time as D-noz increases can be related to the higher local scalar dissipation rate in the large nozzle case.

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