Homogeneous Charge Compression Ignition Engine: A Simulation Study on the Effects of Inhomogeneities
Author:
Maigaard P.1, Mauss F.1, Kraft M.2
Affiliation:
1. Division of Combustion Physics, Lund University, P. O. Box 118, 22100 Lund, Sweden 2. Department of Chemical Engineering, University of Cambridge, Cambridge CB2 3RA, UK
Abstract
A stochastic model for the HCCI engine is presented. The model is based on the PaSPFR-IEM model and accounts for inhomogeneities in the combustion chamber while including a detailed chemical model for natural gas combustion, consisting of 53 chemical species and 590 elementary chemical reactions. The model is able to take any type of inhomogeneities in the initial gas composition into account, such as inhomogeneities in the temperature field, in the air-fuel ratio or in the concentration of the recirculated exhaust gas. With this model the effect of temperature differences caused by the thermal boundary layer and crevices in the cylinder for a particular engine speed and fuel to air ratio is studied. The boundary layer is divided into a viscous sublayer and a turbulent buffer zone. There are also colder zones due to crevices. All zones are modeled by a characteristic temperature distribution. The simulation results are compared with experiments and a previous numerical study employing a PFR model. In all cases the PaSPFR-IEM model leads to a better agreement between simulations and experiment for temperature and pressure. In addition a sensitivity study on the effect of different intensities of turbulent mixing on the combustion is performed. This study reveals that the ignition delay is a function of turbulent mixing of the hot bulk and the colder boundary layer.
Publisher
ASME International
Subject
Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering,Fuel Technology,Nuclear Energy and Engineering
Reference15 articles.
1. Amneus, P., Nilsson, D., Mauss, F., Christensen, M., and Johansson, B., 1998, “HCCI Engine: Experiments and Detailed Kinetic Calculations,” COMODIA 98, Japan Society of Mechanical Engineers, Tokyo, Japan, pp. 567–572. 2. Christensen, M., Johansson, B., Amneus, P., and Mauss, F., “Supercharged HCCI Engine,” SAE Paper No. 980787. 3. Aceves, S. M., Flowers, D. L., Westbrook, C. K., Smith, J. R., and Pitz, W., 2000, “A Multi-Zone Model for Prediction of HCCI Combustions and Emissions,” SAE Paper No. 2000-01-0327. 4. Kraft, M., 1998, “Stochastic Modelling of Turbulent Reacting Flow in Chemical Engineering,” VDI Verlag, Fortschrittsberichte des VDI, Reihe 6(391). 5. Procaccini, C., Kraft, M., Fey, H., Bockhorn, H., Longwell, J. P., Sarofim, A., and Smith, K. A., 1998, “PIC Formation During the Combustion of Simple Hydrocarbons in Inhomogeneous Incineration Systems,” Proc. Combust. Inst.,27, pp. 1275–1281.
Cited by
26 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献
|
|