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Optimization of Injection Parameters for Diesel PCCI Combustion

Author: LinChunWei
Tutor: ChenShi
School: Dalian University of Technology
Course: Engineering Thermophysics
Keywords: Premixed charge compression ignition Genetic Algorithms Combustion Optimization Emission
CLC: U464.172
Type: Master's thesis
Year: 2011
Downloads: 102
Quote: 0
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Abstract


Premixed charge compression ignition (PCCI) combustion mode, the injection parameter is a key factor in the degree of impact of the fuel and air mixture, combustion quality, so this writing parallel optimizer KIVA3V-NSGA2-MS, to optimize the injection pressure, injection timing and jet matching relationship between the angle between the three parameters to reduce nitrogen oxides (NOx) and soot emissions and the purpose of indicating fuel consumption (ISFC). The PCCI is to advance fuel injection, oil and gas on fire before premixed low-temperature combustion of a new combustion technology. In this paper, the CFD software-Kiva-3V program as simulation tools, simulation of a PCCI diesel engines combustion process. Select non-dominated Sorting Genetic Algorithm (NSGA2) as an optimization tool, according to the master-slave parallel algorithm NSGA2 adapt calculation process parallelization. Main processor calculating the fitness assigned to each processor, after the end of the calculation results from the processor will return to the main processor and the host processor other genetic operations. The fitness calculation Parallel shorten the calculation time linear. Calculation will be non-dominated sorting genetic algorithm NSGA2 KIVA-3V and the master-slave parallel algorithms (Master-Slave) coupled into the KIVA3V-NSGA2-MS procedures, optimize PCCI combustion to search for the optimal injection parameters match. According to optimize the results of a Pareto optimal numerical example is based on the use of KIVA-3V under the control variables for each injection parameters for analog comparative analysis of each injection parameters of PCCI combustion. Spray positioning burning, using cylinder equivalence ratio distribution and spray positioning diagram detailed analysis of spray positioned on the Combustion and Emissions. The simulation results showed that the PCCI mode for engine combustion optimization design, this article KIVA3V-NSGA2-MS program can be effective, rapid and extensive search of the optimal solution to meet different emissions and fuel consumption conditions and linearization shorten the calculation time. Basic test, simulation and optimization of a Pareto optimal solution, a 17.34% reduction in NOx emissions, soot emissions reduced by 58.23%. When the injection angle of 80 degrees, the injection pressure of 149 MPa, injection timing at 27. CA BTDC before, the cylinder is completely premixed combustion, high temperature combustion starting point before TDC 11. CA nearby. PCCI combustion mode, since the start of injection in advance, to improve the injection pressure, no significant effect on combustion and emissions. The extent of fuel and air mixture and combustion emission values, needs to consider the injection timing and injection angle factors.

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CLC: > Transportation > Road transport > Automotive Engineering > Automotive engine > Reciprocating engine > Various types of reciprocating engines > Diesel engine
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