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3D Numerical Simulation Research of Spray and Combustion Process in TY3100 Non-road Diesel Engine

Author: XiangLiangShan
Tutor: LuoMaJi
School: Wuhan University of Technology
Course: Power Machinery and Engineering
Keywords: Non-road diesel engines Spray Combustion CFD Injection pressure Combustion chamber
CLC: TK421.2
Type: Master's thesis
Year: 2011
Downloads: 97
Quote: 2
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Abstract


The diesel engine has a high thermal efficiency and economic good advantage, therefore, non-road machinery mostly diesel as a power source. Spray combustion process of the diesel engine is the core of the work cycle and key direct impact on diesel power, economy and emissions performance. Under the dual pressure of energy and environmental issues, the non-road diesel engines to meet strict emission regulations, optimization of non-road diesel spray combustion process has a very important significance. Relative to the pilot study, the internal combustion engine cylinder spray combustion process of multi-dimensional numerical simulation to predict the performance of the diesel engine to guide and optimize the design of the combustion system has the advantages of low cost of system development, data acquisition convenient short development cycle of Diesel spray fog combustion process, the complex and changeable physical, chemical processes important research tools. In this paper, the analysis of the status quo of numerical simulation of the combustion process of diesel spray at home and abroad as well as to understand the basis of the numerical method of spray combustion CFD software STAR-CD TY3100 direct-injection diesel engine cylinder spray and combustion process of a multi-dimensional numerical simulation. The papers first established the TY3100 cylinder of a diesel engine spray and combustion process three-dimensional simulation calculation model, with an emphasis on the the empirical parameters Aebu computing grid combustion model and EBU LACT simulation results. Among them, the use of three-dimensional modeling software UG establish the computational domain, including the cylinder, the combustion chamber of the inlet and exhaust ports, including three-dimensional solid model using the STAR-CD and the internal combustion engine moving mesh generation tool ES-ICE diesel-powered grid model and with the engine one-dimensional simulation software GT-POWER the simulated initial and boundary conditions. The calculated grid and experience parameters Aebu of the simulation results show that: the the spray combustion numerical simulation results of the computational mesh and model parameters greater dependence; With the increasing mesh refinement, the spray jet speed spray oil beam geometry becomes elongated, spray penetration distance increases; grid D for spray in this study; make the combustion reaction rate increases Aebu speed up the calculation Aebu taken as 4. Secondly, the use of the calculation model of the of TY3100 original spray combustion process simulation, a detailed analysis of a diesel engine cylinder flow field, spray development patterns, the spatial distribution of the spray droplets and fuel concentration distribution, combustion temperature field and emissions of NOx and SOOT concentration field distribution. The study showed that the eccentric arrangement causes uneven concentration distribution of direction of the respective injection holes fuel combustor; lower injection pressures lead to poor quality of fuel atomization and lower utilization of air in the combustion chamber pits; NOx in the high-temperature oxygen-enriched combustion chamber the area between the pit and the piston and the cylinder head generate necking in the combustion chamber and the cylinder head at the top, SOOT generated squish area. The results provide the basis for the evaluation and improvement of the combustion system of the original machine. Finally, the injection pressure and combustion chamber shape diesel engine mixture formation and combustion process. Injection Pressure from the original machine 60MPa to 120MPa, the atomization quality is improved and the fuel distribution region increases the utilization of the air in the combustion chamber is increased, reducing the amount of soot generated, while the amount of NOx generated is increased, but the decrease in soot amplitude ratio NOx increased 13%. Increased injection pressure, combustion chamber shape but also its match design three different necking than the size of the combustion chamber, so the compression ratio unchanged. In the case of the 120MPa injection pressure spray and combustion process, three different shapes of the combustion chamber, the numerical simulation. The results show that the B vortex of the combustion chamber to maintain good, preferably fuel and air mixture, a better compromise between the emissions of NOx and SOOT.

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CLC: > Industrial Technology > Energy and Power Engineering > Internal combustion engine > Diesel engine > Theory > Combustion process
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