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research-article

DAMKöHLER NUMBER ANALYSIS ON THE EFFECT OF OZONE ON AUTO-IGNITION AND FLAME PROPAGATION IN INTERNAL COMBUSTION ENGINES

[+] Author and Article Information
Seunghwan Keum

30500 Mound Road Warren, MI 48090 seunghwan.keum@gm.com

Tang-Wei Kuo

30565 William Durant Boulevard Warren, MI 48092 tang_kuo@hotmail.com

1Corresponding author.

Contributed by the Internal Combustion Engine Division of ASME for publication in the Journal of Energy Resources Technology. Manuscript received April 17, 2019; final manuscript received April 23, 2019; published online xx xx, xxxx. Assoc. Editor: Hameed Metghalchi.

ASME doi:10.1115/1.4043639 History: Received April 17, 2019; Accepted April 28, 2019

Abstract

Ozone assisted combustion has shown promise in stabilizing combustion and extending operating range of internal combustion engines. However, it has been reported that sensitivity of ozone quantity on combustion varies significantly dependent on combustion modes. For example, auto-ignition driven combustion in homogeneous charge compression ignition (HCCI) engine was found to be highly sensitive to the ozone concentration, and up to 100 PPM was found to be sufficient to promote combustion. On the other hand, flame propagation in spark-ignited (SI) engine has been reported to be much less sensitive to the ozone amount, requiring ozone concentration about 3000~6000 PPM to realize any benefit in the flame speed. A better understanding on the ozone sensitivity is required for combustion device design with ozone addition. In this study, a Damköhler number analysis was performed to analyze the vast difference in the ozone sensitivity between auto-ignition and flame propagation. The analysis showed that, for ozone to be effective in flame propagation, the contribution of ozone on chemistry should be large enough to overcome the diffused radical from the oxidation layer. It is expected that similar analysis will be applicable to any additives to provide an understanding of their effect.

Copyright © 2019 by ASME
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