Advanced

Supercharged Homogeneous Charge Compression Ignition

Christensen, Magnus LU ; Johansson, Bengt LU ; Amnéus, Per LU and Mauss, Fabian LU (1998) In SAE Transactions, Journal of Engines 107(SAE Technical Paper 980787).
Abstract
The Homogeneous Charge Compression Ignition (HCCI) is the third alternative for combustion in the reciprocating engine. Here a homogeneous charge is used as in a spark-ignited engine, but the charge is compressed to autoignition as in a diesel. The main difference compared with the Spark Ignition (SI) engine is the lack of flame propagation and hence the independence from turbulence. Compared with the diesel engine, HCCI has a homogeneous charge and hence no problems associated with soot and NOdx formation. Earlier research on HCCI showed high efficiency and very low amounts of NOdx, but HC and CO were higher than in SI mode. It was not possible to achieve high IMEP values with HCCI, the limit being 5 bar. Supercharging is one way to... (More)
The Homogeneous Charge Compression Ignition (HCCI) is the third alternative for combustion in the reciprocating engine. Here a homogeneous charge is used as in a spark-ignited engine, but the charge is compressed to autoignition as in a diesel. The main difference compared with the Spark Ignition (SI) engine is the lack of flame propagation and hence the independence from turbulence. Compared with the diesel engine, HCCI has a homogeneous charge and hence no problems associated with soot and NOdx formation. Earlier research on HCCI showed high efficiency and very low amounts of NOdx, but HC and CO were higher than in SI mode. It was not possible to achieve high IMEP values with HCCI, the limit being 5 bar. Supercharging is one way to dramatically increase IMEP. The influence of supercharging on HCCI was therefore experimentally investigated. Three different fuels were used during the experiments: iso-octane, ethanol and natural gas. Two different compression ratios were used, 17:1 and 19:1. The inlet pressure conditions were set to give 0, 1, or 2 bar of boost pressure. The highest attainable IMEP was 14 bar using natural gas as fuel at the lower compression ratio. The limit in achieving even higher IMEP was set by the high rate of combustion and a high peak pressure.



Numerical calculations of the HCCI process have been performed for natural gas as fuel. The calculated ignition timings agreed well with the experimental findings. The numerical solution is, however, very sensitive to the composition of the natural gas. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Supercharging, HCCI, Combustion, Engine
in
SAE Transactions, Journal of Engines
volume
107
issue
SAE Technical Paper 980787
publisher
Society of Automotive Engineers
external identifiers
  • scopus:72449167506
ISSN
0096-736X
language
English
LU publication?
yes
id
02727c72-56a4-429a-b1e8-26687d534a9f (old id 164449)
alternative location
http://www.sae.org/technical/papers/980787
date added to LUP
2007-06-27 12:01:15
date last changed
2017-07-30 04:32:21
@article{02727c72-56a4-429a-b1e8-26687d534a9f,
  abstract     = {The Homogeneous Charge Compression Ignition (HCCI) is the third alternative for combustion in the reciprocating engine. Here a homogeneous charge is used as in a spark-ignited engine, but the charge is compressed to autoignition as in a diesel. The main difference compared with the Spark Ignition (SI) engine is the lack of flame propagation and hence the independence from turbulence. Compared with the diesel engine, HCCI has a homogeneous charge and hence no problems associated with soot and NOdx formation. Earlier research on HCCI showed high efficiency and very low amounts of NOdx, but HC and CO were higher than in SI mode. It was not possible to achieve high IMEP values with HCCI, the limit being 5 bar. Supercharging is one way to dramatically increase IMEP. The influence of supercharging on HCCI was therefore experimentally investigated. Three different fuels were used during the experiments: iso-octane, ethanol and natural gas. Two different compression ratios were used, 17:1 and 19:1. The inlet pressure conditions were set to give 0, 1, or 2 bar of boost pressure. The highest attainable IMEP was 14 bar using natural gas as fuel at the lower compression ratio. The limit in achieving even higher IMEP was set by the high rate of combustion and a high peak pressure.<br/><br>
<br/><br>
Numerical calculations of the HCCI process have been performed for natural gas as fuel. The calculated ignition timings agreed well with the experimental findings. The numerical solution is, however, very sensitive to the composition of the natural gas.},
  author       = {Christensen, Magnus and Johansson, Bengt and Amnéus, Per and Mauss, Fabian},
  issn         = {0096-736X},
  keyword      = {Supercharging,HCCI,Combustion,Engine},
  language     = {eng},
  number       = {SAE Technical Paper 980787},
  publisher    = {Society of Automotive Engineers},
  series       = {SAE Transactions, Journal of Engines},
  title        = {Supercharged Homogeneous Charge Compression Ignition},
  volume       = {107},
  year         = {1998},
}