Conditional moment closure modelling for HCCI featuring compression heating and expansion cooling

Fatemeh Salehi, Mohsen Talei, Evatt R. Hawkes, Ankit Bhagatwala, Jacqueline H. Chen, Sanghoon Kook

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

Abstract

This paper presents a conditional moment closure (CMC) model for ignition of a lean ethanol/air mixture under homogeneous charge compression ignition (HCCI) conditions. A set of direct numerical simulations (DNSs) presented by Bhagatwala et al. (2014) is used to evaluate the performance of the CMC model. The DNS data includes five cases with a mean temperature of 924 K and three different levels of thermal stratification. The effect of compression heating and expansion cooling is considered in the first three cases with T′ =15, 25 and 40 K. For this purpose, an inert mass source term is added to the governing equations. However, the other two cases with T′ = 15 and 40 K do not consider compression heating and expansion cooling. The results show a better agreement between the CMC and DNS for cases in which compression heating and expansion cooling is considered. Further investigation of the DNS data shows that the contribution of the diffusion term in the CMC equations, representing the importance of deflagration mode, is only significant for the case which has the largest level of thermal stratification and does not involve compression heating and expansion cooling.
Original languageEnglish
Title of host publication9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015
Place of PublicationSanta Barbara, California
PublisherInternational Symposium series on Turbulence and Shear Flow Phenomena
Chapter2C-5
Number of pages6
Volume1
ISBN (Electronic)9780000000002
Publication statusPublished - 2015
Externally publishedYes
EventInternational Symposium on Turbulence and Shear Flow Phenomena (TSFP-9) (9th : 2015) - Melbourne, Australia
Duration: 30 Jun 20153 Jul 2015
Conference number: 9th

Conference

ConferenceInternational Symposium on Turbulence and Shear Flow Phenomena (TSFP-9) (9th : 2015)
Abbreviated titleTSFP-9
CountryAustralia
CityMelbourne
Period30/06/153/07/15

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  • Cite this

    Salehi, F., Talei, M., Hawkes, E. R., Bhagatwala, A., Chen, J. H., & Kook, S. (2015). Conditional moment closure modelling for HCCI featuring compression heating and expansion cooling. In 9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015 (Vol. 1). Santa Barbara, California: International Symposium series on Turbulence and Shear Flow Phenomena.