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-octane + 99% argon is used as a base 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. Selected laser wavelength was 633 nm (He-Ne laser). In addition, tune 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 showed that soot particle temperature T_p was higher than ambient temperature T_5 by about 200 - 400 K due to heat release during the soot particle formation process. The soot volume fraction curve showed the bell shape, and hydrogen addition to iso-octane reduced soot volume fraction for T_5=1800 K.
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