點(diǎn)燃式甲醇發(fā)動(dòng)機(jī)燃燒過程模擬及燃燒室參數(shù)優(yōu)化.pdf

1、河北工業(yè)大學(xué)碩士學(xué)位論文點(diǎn)燃式甲醇發(fā)動(dòng)機(jī)燃燒過程模擬及燃燒室參數(shù)優(yōu)化姓名：李麗申請學(xué)位級(jí)別：碩士專業(yè)：熱能工程指導(dǎo)教師：黎蘇；鄭清平2010-12點(diǎn)燃式甲醇發(fā)動(dòng)機(jī)燃燒過程模擬及燃燒室參數(shù)優(yōu)化iiNumerical Numerical Numerical Numerical Simulation Simulation Simulation Simulation o o o on n n n Combustion Combustion Co

2、mbustion Combustion Process Process Process Process of of of of Spark-Ignition Spark-Ignition Spark-Ignition Spark-IgnitionMethanol Methanol Methanol Methanol Engine Engine Engine Engine and and and and Parameter Paramet

3、er Parameter Parameter O O O Optimization ptimization ptimization ptimizationof of of of Combustion Combustion Combustion Combustion Chamber Chamber Chamber ChamberABSTRACT ABSTRACT ABSTRACT ABSTRACTIn a variety of alter

4、native fuels in internal combustion engine, the application and research of methanolfuel are widely considered to have a good prospect. At the same time, with the development of computertechnology, multi-dimensional nume

5、rical simulation is playing an increasingly important role on the researchof work process in internal combustion engine. Through multi-dimensional numerical simulation, we can getsome more information, which we can’t get

6、 in the experiment.In this paper, the research on numerical simulation of a spark ignition methanol engine was performedwith AVL FIRE software. The calculation started with the intake valve opening and ended with the exh

7、austvalve opening. Firstly, established the CAD geometry model of methanol engine by three-dimensional drawingsoftware named UG, and then imported it to FIRE software. In the FIRE software, the moving mesh includingintak

8、e port, intake valve and piston were generated by the use of moving mesh generation tool, established themathematical model and validated with experiment. Then the simulation results was analyzed, includingvelocity field

9、 and turbulent kinetic energy field during intake and compress process, the distribution of flamepropagation contour, flame velocity field, temperature field and NOx in the combustion chamber after ignition.In addition,

10、for three bowl-type combustion chambers with different shapes: straight port combustionchamber, reduced port combustion chamber and exposure port combustion chamber. The calculation modelwas established separately and st

11、arted to calculation. In different shapes of combustion chamber, gas flow andsize of turbulence intensity, flame propagation speed, the rate of heat release, cylinder combustion pressure,the rate of pressure rise, cylind

12、er temperature and NOx emission were detailed analysis. Considering the engineperformance and the process of craftwork, etc., ultimately the author determined the bowl-type combustionchamber with straight port is more re

13、asonable. In the straight port combustion chamber, the spark plug was setin the three different positions, cylinder center, departure cylinder center which was the original fuel injectorposition of the diesel engine, far