The Multi-area Model And Application For Combustion Process In Gasoline Engines

In this paper, a multi-area diagnostic & predictive model are proposed for combustion process in gasoline engines. Models are composed of thermodynamic model, turbulence flams propagation model & nitrogen oxides(NOx) formation model. By using the formula of mass burning rate, The effects of turbulence on combustion process are directly reflected All calculation results are compared with the experimental data and the conclusions in some references concerned as well And the results show the numerical solution reasonable. The effects of some engine operation and design parameters on the combustion process are analyzed The paper contains following contents:The development and present condition of mathematical model and experimental method for combustion process in gasoline engine are expounded, the works that mis paper wfll make are presented in chapter 1.A two-zone and a multi-zone diagnostic and predictive models are proposed for combustion process in gasoline engine, contains spark ignition process, transfer heat and NO emission calculation, in chapter 2.Put forward a new geometry model for calculating firebox figure in order to improve on simulating forecasting precision of combustion model in chapter 3.The principle of opt-electronic measuring method, essential construction of sensor and major experiments of the paper are explained in chapter 4.The engine simulation models are applied on the test engine to investigate the influence of several parameters or factors on engine perfonnance. These parameters or factors include ignition advance, the location of spark plug, the ratio of fuel/air and the structure of exhaust and scavenging ports in chapters.A new method is put forward on thermodynamics combustion model to make imitating research on EGR -A software is made to calculate the amount of NO from the gasoline by connecting with the practical condition in our country, starting with thermodynamics and experiment At the same time make a system research to influence by the exhaust gas returning system on the gasoline, such as exhaust gas, fuel economy, and power, finally a new thought is afforded for optimizing all the EGR parameter in chapter 6.Based on the first part of mis paper, the combustion modeling for gasoline is thoroughly studied. A fractal expression of UT is incorporated into the combustion model with more attention focused on the choice of inner cutoff 1, a fractal concept which is crucial for determination of UT- The research reveals that the Gibson scale is more applicable men Kolmogorov scale. As a phenomenaldescription of combustion process, fiactal is also an effective tool in chapter 7.The research conclusions of the paper are presented in chapter 8.