期刊论文详细信息
FUEL 卷:243
A shock tube study of n-heptane, iso-octane, n-dodecane and iso-octane/n-dodecane blends oxidation at elevated pressures and intermediate temperatures
Article
Shao, Jiankun1  Choudhary, Rishav1  Peng, Yuzhe1  Davidson, David F.1  Hanson, Ronald K.1 
[1] Stanford Univ, Mech Engn Dept, 418 Panama Mall,Room 104, Stanford, CA 94305 USA
关键词: Ignition delay;    Shock tube;    n-Heptane;    Iso-octane;    n-Dodecane;    First-stage ignition;   
DOI  :  10.1016/j.fuel.2019.01.152
来源: Elsevier
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【 摘 要 】

Ignition delay times (IDT) of n-heptane, iso-octane, n-dodecane, and iso-octane/n-dodecane blends, in stoichiometric mixtures with air, were measured behind reflected shock waves in a heated, high-pressure shock tube. Measurements were taken at temperatures of 665-1250 K, pressures of 28-70 atm, and equivalence ratios near unity. Pressure time-history recorded from sidewall piezo-electric transducers, fuel-concentration time-history obtained from fixed-wavelength laser absorption at 3.39 mu m, and OH* (306 nm) emission time-history recorded by a Si detector, were used to determine IDT. The staged ignition phenomenon in the low temperature regime was also examined with attention on the 1st stage fuel decomposition fraction. IDT measurements were also made using the constrained-reactive-volume strategy, which has the capability to eliminate non-ideal effects such as remote ignition, and were compared with measurements using a conventional filling technique. The current measurements provide a wide range (28-70 atm) of ignition delay times for key surrogate fuels under practical engine conditions, and hence provide validation targets for refinement of chemical kinetic models.

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