Abstract
This paper discusses the effects of hydrogen addition on soot formation in iso-octane pyrolysis using a shock tube. In the experiments, 1% iso-C_8H_<18> + 99% Ar and 1% iso-C_8H_<18> + 1% H_2 + 98% Ar are used as a test gas in the temperature range of 1800-2600 K and in the pressure of 1.2 ± 0.1 MPa behind a reflected shock wave. Soot formation process was characterized by induction time and soot volume fraction, which is obtained from laser light extinction measurement. In addition, time history of soot particles temperature was calculated based on spectral dependence of monochromatic emissive power from thermal radiation from the soot particles. The experimental results show that soot formation had bell-shaped temperature dependence exhibiting maximum at 2000 K with and without hydrogen addition. Adding hydrogen to iso-octane, soot volume fraction reduced for T_5 = 1800 K. Additionally, induction time increased for T_5 = 1800 K and 2000 K. Soot particle temperature T_P was higher than T_5 by about 200-400 K except for around 1800 K. Consequently, hydrogen addition to iso-octane suppressed soot formation for T_5 = 1800 K, while no distinct effects of hydrogen addition were observed for T_5 = 2000 K and 2500 K.
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