Analysis of the transient temperature fields of a diesel engine liner by using a moving boundary method

作者：Feng Liyan; Liu Chao; Wang Meng^*; Wang Weiyao; Long Wuqiang

来源：Journal of Harbin Engineering University, 2017, 38(3): 378-384.

DOI：10.11990/jheu.201601080

• Liner
• Medium speed diesel engine
• Moving boundary methods
• Operating condition
• Temperature fluctuation
• Thermal boundary conditions
• Transient temperature
• Transient temperature fields

In the finite element analysis of a diesel engine liner, transient thermal boundary conditions have essential influence on the temperature distribution calculation. To analyze the temperature fields and thermal load of the liner of a medium-speed diesel engine, the transient temperature fields of the liner were analyzed based on a moving boundary method. The working process of a diesel engine was simulated with a 1-D working cycle simulation, whereby the transient temperature and heat transfer coefficient of the working fluid were obtained. With the combination of transient piston position, the liner surface area was divided into three major areas: working fluid contacting area, piston assembly contacting area, and crankcase air contacting area. The transient thermal boundary conditions of these areas were applied separately. With the application of a cyclically varying thermal load on the liner, the transient temperature fields of the liner were calculated. The results show that under stable operating conditions, the liner surface temperatures present cyclical variation. The maximum liner surface temperature and the highest temperature fluctuation appear on the top of the liner. The amplitudes of the temperature fluctuations decrease along the cylinder axial. In addition, the temperature fluctuations in the liner decrease rapidly along the radial direction.

• 出版日期2017