Simulation of Hcci-Addressing Compression Ratio and Turbocharging
(2002) In SAE Technical Papers- Abstract
- This paper focuses on the performance and efficiency of an HCCI (Homogenous Charge Compression Ignition) engine system running on natural gas or landfill gas for stationary applications. Zero-dimensional modelling and simulation of the engine, turbo, inlet and exhaust manifolds and inlet air conditioner (intercooler/heater) are used to study the effect of compression ratio and exhaust turbine size on maximum mean effective pressure and efficiency. The extended Zeldovich mechanism is used to estimate NO- formation in order to determine operation limits. Detailed chemical kinetics is used to predict ignition timing.
Simulation of the in-cylinder process gives a minimum gl-value of 2.4 for natural gas, regardless of... (More) - This paper focuses on the performance and efficiency of an HCCI (Homogenous Charge Compression Ignition) engine system running on natural gas or landfill gas for stationary applications. Zero-dimensional modelling and simulation of the engine, turbo, inlet and exhaust manifolds and inlet air conditioner (intercooler/heater) are used to study the effect of compression ratio and exhaust turbine size on maximum mean effective pressure and efficiency. The extended Zeldovich mechanism is used to estimate NO- formation in order to determine operation limits. Detailed chemical kinetics is used to predict ignition timing.
Simulation of the in-cylinder process gives a minimum gl-value of 2.4 for natural gas, regardless of compression ratio. This is restricted by the NO formation for richer mixtures. Lower compression ratios allow higher inlet pressure and hence higher load, but it also reduces indicated efficiency. Given indicated mean effective pressure, IMEP and a fixed friction, FMEP the best brake efficiency was attained at compression ratios of 15:1 to 17:1, according to the simulations.
Full system simulation using three different turbines, showed that the required inlet pressure could not be reached. At these low loads a high compression ratio enables lower inlet temperature. This provides higher mass flow and hence power output. The higher compression ratio also increases the indicated and brake efficiency. Very small turbines or advanced turbocharging technologies seem necessary in order to give acceptable specific power and brake efficiency. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/707674
- author
- Erlandsson, Olof LU ; Amnéus, Per LU ; Einewall, Patrik LU ; Mauss, Fabian LU and Johansson, Bengt LU
- organization
- publishing date
- 2002
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Combustion Engines combustion physics laserdiagnostic
- in
- SAE Technical Papers
- publisher
- Society of Automotive Engineers
- language
- English
- LU publication?
- yes
- additional info
- Document Number: 2002-01-2862
- id
- ade5eb27-088b-409f-83de-e03d4667b085 (old id 707674)
- alternative location
- http://www.sae.org/technical/papers/2002-01-2862
- date added to LUP
- 2016-04-04 12:01:49
- date last changed
- 2018-11-21 21:08:36
@article{ade5eb27-088b-409f-83de-e03d4667b085, abstract = {{This paper focuses on the performance and efficiency of an HCCI (Homogenous Charge Compression Ignition) engine system running on natural gas or landfill gas for stationary applications. Zero-dimensional modelling and simulation of the engine, turbo, inlet and exhaust manifolds and inlet air conditioner (intercooler/heater) are used to study the effect of compression ratio and exhaust turbine size on maximum mean effective pressure and efficiency. The extended Zeldovich mechanism is used to estimate NO- formation in order to determine operation limits. Detailed chemical kinetics is used to predict ignition timing. <br/><br> <br/><br> Simulation of the in-cylinder process gives a minimum gl-value of 2.4 for natural gas, regardless of compression ratio. This is restricted by the NO formation for richer mixtures. Lower compression ratios allow higher inlet pressure and hence higher load, but it also reduces indicated efficiency. Given indicated mean effective pressure, IMEP and a fixed friction, FMEP the best brake efficiency was attained at compression ratios of 15:1 to 17:1, according to the simulations. <br/><br> <br/><br> Full system simulation using three different turbines, showed that the required inlet pressure could not be reached. At these low loads a high compression ratio enables lower inlet temperature. This provides higher mass flow and hence power output. The higher compression ratio also increases the indicated and brake efficiency. Very small turbines or advanced turbocharging technologies seem necessary in order to give acceptable specific power and brake efficiency.}}, author = {{Erlandsson, Olof and Amnéus, Per and Einewall, Patrik and Mauss, Fabian and Johansson, Bengt}}, keywords = {{Combustion Engines combustion physics laserdiagnostic}}, language = {{eng}}, publisher = {{Society of Automotive Engineers}}, series = {{SAE Technical Papers}}, title = {{Simulation of Hcci-Addressing Compression Ratio and Turbocharging}}, url = {{http://www.sae.org/technical/papers/2002-01-2862}}, year = {{2002}}, }