F170 Air-cooled Diesel Engine Cylinder Liner Heat Load Analysis

Compared with water-cooled diesel engine, air-cooled diesel engine has its particular virtues such as simpler structure, higher efficiency, easier cold-starting, higher adaptability and easier maintenance. For these reasons, it has been widely used in small power diesel engine. The lower cooling efficiency of the air, however, leads to the higher thermal load , more difficult to be strengthened and more likely to be failed due to high thermal load. Therefore, it is important to modify the cooling system and optimize the structure parameter of air-cooled diesel engine.The thermal load of F170 air-cooled diesel engine are investigated by using of the thermocouples to measure temperature field of the heated parts' in different cooling system and different structure parameter. The effects to the cylinder block thermal load of the cylinder's design, the material and the cooling fan are analyzed. In the same time, according to the measured indicator diagram of the cylinder pressure in the engine, the heat transfer boundary of the cylinder block has been calculated. By usinga FEM (Finite Element Method) software-ANSYS, the mathematic model areestablished. The application of FEM to structure design of the cylinder block of air-cooled diesel engine are studied systematically. This FEM involved strength, stiffness, temperature field, thermal stress field, thermal deformation and so on. In order to optimization of the structure design, The APDL (ANSYS Parametric Design Language) method are introduced to optimize the structure parameter.