The Experimental Research And Numerical Simulation Of The Thermal Load Of The Heated Parts Of Diesel Engine

With the development of diesel engine towards high speed and aggrandizement constantly, the problems of its heat transfer and thermal load become more and more outstanding. Then how to settle the thermal load problem of diesel engine availably and improve the reliability and usage life of the heated parts of diesel engine becomes more and more important and urgent. Because of the influence of thermal load, many malfunctions, such as abnormal wear of the heated parts of diesel engine, corrosion and ablation of materials and destroy by thermal fatigue etc, often occurs. And it influents the power capability, economic capability and reliability of diesel engine directly or indirectly.In the paper the development and actuality of the research of the heat transfer and thermal load in the diesel engine project are reviewed, then the thermal condition, thermal load and thermal load malfunction are defined and explained. Then the basic fundamental and method of the computation of thermal load of the heated parts of diesel engine are elaborated, the deflective differential equation of heat conduction, basic equation and boundary condition of the theory of thermo elasticity and numerical computation by FEA are introduced.In this paper the method of the temperature measurement of the heated parts of diesel engine is hardness tucks way. Through the measurement for the heated parts of fire chamber, whether the temperature is in the admit extent of the capability of the used material can be inspected. Then the law of heat flow and the distribute of the heat loss are estimated. In this paper the numerical simulations of the temperature field and the thermal deformation of the heated parts of 4112 diesel engine are carried by ANSYS software.Through the experimental research and numerical simulation of the thermal load of 4112 diesel engine, the statuses of its thermal load are gotten, and the analysis and evaluate for the thermal load statuses are carried. That will point out approach or find out the method for the reform of the thermal load, and provide the direction andpotent guarantee for the precise design of diesel engine in future. On the other hand, in the design stage of diesel engine, the forecast for thermal load can be carried through the database, graphic base of the thermal load and the law and experience of heat transfer for the purpose of shortening the period of design, trial produce and experiment.HCCI is a new combustion mode. It has some advantages such as: higher thermal efficience, very low NOx and PM exhaust and low thermal load. In the paper taken 4112 diesel engine as experimental engine, the experimental research of HCCI combustion for NO.2 and NO.4 cylinder is carried. Some characters of HCCI combustion are summarized.