The effects of boost pressure on stratification and burn duration of gasoline homogeneous charge compression ignition combustion
Abstract
This article investigates the effects of intake pressure (boost) on the pre-ignition stratification and burn duration of homogeneous charge compression ignition combustion. Full cycle computational fluid dynamics simulations are performed with gasoline kinetics. An intake pressure sweep is performed while maintaining the same combustion timing and mean composition. The burn duration reduces with increasing boost, even though intake temperature is reduced to hold combustion timing constant. It is shown that the compositional stratification increases with boost whereas thermal stratification decreases. A quasi-dimensional model is employed to assess the effect of compositional stratification, pressure, mean temperature and isolate the effect of thermal stratification on burn duration. The analysis reveals that reducing charge temperature neutralizes the effect of increased boost on reactivity and the shorter burn durations at higher boost are primarily due to the lower thermal stratification. It is shown that higher pressures do not significantly increase the mixing and the lower thermal stratification is due to lower wall heat losses per unit charge mass. A follow-up set of non-reacting simulations with adiabatic walls corroborate this claim by revealing a constant magnitude of thermal stratification across the boost sweep.
- Authors:
-
- Walter E. Lay Automotive Laboratory, The University of Michigan, Ann Arbor, MI, USA, Ford Research and Innovation Center, Dearborn, MI, USA
- Walter E. Lay Automotive Laboratory, The University of Michigan, Ann Arbor, MI, USA
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1494646
- Grant/Contract Number:
- EE0003533
- Resource Type:
- Published Article
- Journal Name:
- International Journal of Engine Research
- Additional Journal Information:
- Journal Name: International Journal of Engine Research Journal Volume: 20 Journal Issue: 3; Journal ID: ISSN 1468-0874
- Publisher:
- SAGE Publications
- Country of Publication:
- United Kingdom
- Language:
- English
Citation Formats
Shingne, Prasad S., Middleton, Robert J., Borgnakke, Claus, and Martz, Jason B. The effects of boost pressure on stratification and burn duration of gasoline homogeneous charge compression ignition combustion. United Kingdom: N. p., 2018.
Web. doi:10.1177/1468087417754177.
Shingne, Prasad S., Middleton, Robert J., Borgnakke, Claus, & Martz, Jason B. The effects of boost pressure on stratification and burn duration of gasoline homogeneous charge compression ignition combustion. United Kingdom. https://doi.org/10.1177/1468087417754177
Shingne, Prasad S., Middleton, Robert J., Borgnakke, Claus, and Martz, Jason B. Fri .
"The effects of boost pressure on stratification and burn duration of gasoline homogeneous charge compression ignition combustion". United Kingdom. https://doi.org/10.1177/1468087417754177.
@article{osti_1494646,
title = {The effects of boost pressure on stratification and burn duration of gasoline homogeneous charge compression ignition combustion},
author = {Shingne, Prasad S. and Middleton, Robert J. and Borgnakke, Claus and Martz, Jason B.},
abstractNote = {This article investigates the effects of intake pressure (boost) on the pre-ignition stratification and burn duration of homogeneous charge compression ignition combustion. Full cycle computational fluid dynamics simulations are performed with gasoline kinetics. An intake pressure sweep is performed while maintaining the same combustion timing and mean composition. The burn duration reduces with increasing boost, even though intake temperature is reduced to hold combustion timing constant. It is shown that the compositional stratification increases with boost whereas thermal stratification decreases. A quasi-dimensional model is employed to assess the effect of compositional stratification, pressure, mean temperature and isolate the effect of thermal stratification on burn duration. The analysis reveals that reducing charge temperature neutralizes the effect of increased boost on reactivity and the shorter burn durations at higher boost are primarily due to the lower thermal stratification. It is shown that higher pressures do not significantly increase the mixing and the lower thermal stratification is due to lower wall heat losses per unit charge mass. A follow-up set of non-reacting simulations with adiabatic walls corroborate this claim by revealing a constant magnitude of thermal stratification across the boost sweep.},
doi = {10.1177/1468087417754177},
journal = {International Journal of Engine Research},
number = 3,
volume = 20,
place = {United Kingdom},
year = {Fri Feb 02 00:00:00 EST 2018},
month = {Fri Feb 02 00:00:00 EST 2018}
}
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https://doi.org/10.1177/1468087417754177
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