An Investigation On Thermodynamic Model And Thermal Load Characteristics Of High Power Density 110 Diesel Using Numerical Simulation Tools

The thermodynamic cycle and heat loads characteristic of a High Power Density (HPD) diesel are investigated in this paper. Using the software AVL BOOST, the thermodynamic cycle is calculated and the numerical simulation consequence can be got. After the numerical simulation analysis of some characteristic parameters, we can get the verification that the design target is feasible. It can also be a theoretical support for a deep research of HPD diesel.By means of calculation and comparison of the thermodynamic cycle, the difference of heat loads characteristic between the HPD diesel and gasoline engine under the condition of the same performance per litre are analyze. Some design scheme of the gasoline can be draw lessons from during the design of the HPD diesel engine. The specific conclusion are as follows:1.The quantity ratio of heat transfer of the diesel engine and the gasoline engine with the same performance per litre is 8:9. The performance per litre of the gasoline engine used in passenger vehicles can reach 90KW/L now, so it can be reference to realize the higher heat transfer quantity of the HPD diesel engine.2.The heat flux of the diesel engine and the gasoline engine with the same performance per litre is: 442105 W/m2 and 414874 W/m2, the diesel is a little higher. But the transient heat flux of the diesel engine is two times higher than the gasoline engine. The difference must be considered during the design process. The deep research can be done in the combustion chamber wall and piston top surface.The influence of coolant temperature's change is analyzed. The inference of the change and questions that maybe appeared after the rise of the coolant temperature are demonstrated. The model was changed to simulate the process when the coolant temperature changed. The results show that it is useful for the reduction of the engine capacity and mass. It will enhance the performance of the engine, realize higher power density and smart arrangement plan to achieve downsize.The coolant system of HPD diesel engine have been investigated base on accurate numerical simulation model. The system analysis and deduction of the thermodynamic cycle, heat loads characteristic and general arrangement will be helpful for the design of a new HPD diesel engine.