Study on Unsteady Temperature Field of Diesel Engine Piston

2013 ◽  
Vol 779-780 ◽  
pp. 965-970
Author(s):  
You Liu ◽  
Jing Jing Liu ◽  
Xiao Chen
Keyword(s):  
Temperature Field ◽  
Temperature Fluctuation ◽  
Extreme Temperature ◽  
Temperature Fluctuations ◽  
Cold Start ◽  
Element Model ◽  
Unsteady Temperature ◽  
Unsteady Temperature Field ◽  
Calculate Temperature Field ◽  
Transient Thermal

The paper took the piston of 620 single-cylinder engine as an example,a finite element model of piston was built with the help of ANSYS software. Than to calculate temperature field and and quick cold start conditions respectively[1]. Through the periodic transient thermal analysis, temperature fluctuations on the surface of the piston were derived, which indicated that the surface contacted with gas was the main temperature fluctuation area. The max temperature fluctuation can be up to 20 ° C and the wild fluctuation occurred in a distance of 2 mm from the surface of the piston. Temperatures of the piston went up according to exponential rule during the course of quick cold start, Extreme temperature fluctuations will generate huge quasi-static thermal stress.

scholarly journals Unsteady temperature field calculation in the exothermic reaction

2021 ◽  
Vol 1791 (1) ◽  
pp. 012072
Author(s):  
S V Fedorov ◽  
A S Tolstukha ◽  
I V Fedorov ◽  
V V Zhukovskyy
Keyword(s):  
Temperature Field ◽  
Exothermic Reaction ◽  
Field Calculation ◽  
Unsteady Temperature ◽  
Unsteady Temperature Field

scholarly journals Three-Dimensional Temperature Distribution Produced by a Moving Laser Beam

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
R. Uyhan
Keyword(s):  
Temperature Field ◽  
Theoretical Model ◽  
Temperature Distribution ◽  
Laser Beam ◽  
Three Dimensional ◽  
Constant Speed ◽  
Unsteady Temperature ◽  
Unsteady Temperature Field ◽  
Absorbing Layer

An axisymmetric laser beam, moving with constant speed, heats a thin infrared absorbing layer sandwiched between two plastic sheets. We use a simplified theoretical model to study the three-dimensional unsteady temperature field produced by the moving laser beam.

scholarly journals Heat Transfer and Thermal Deformation Characteristics of Liquid-Cooled Laser Mirror

2014 ◽  
Vol 6 ◽  
pp. 749065 ◽  
Author(s):  
Panpan Hu ◽  
Haihong Zhu ◽  
Chongwen He ◽  
Xiaoming Ren
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Fluid Flow ◽  
Finite Volume ◽  
Thermal Deformation ◽  
Numerical Models ◽  
Element Model ◽  
Flow And Heat Transfer ◽  
Finite Volume Element ◽  
Transient Thermal

A coupled finite volume-element method is developed to simulate the transient thermal deformation of water-cooled mirror by considering fluid flow and convective heat transfer. The simulation process consists of two steps: the 3D finite volume models of fluid flow and heat transfer equation are solved to obtain the time-dependent temperature field by using CFD; then, the obtained temperature field used as final temperature field is unidirectionally coupled to the finite element model for solving the thermoplastic equation. It is concluded that fluid flow not only affects the magnitude of temperature rise and thermal deformation, but also affects the distribution of temperature and thermal deformation. The temperature gradient in the thickness direction ( z direction) is found to be much larger than that in transverse direction. It is found that the temperature and the consequent deformation of water-cooled mirror increase significantly in the first seconds and gradually become steady state in the subsequent time. Experiments are conducted to estimate the precision of numerical models, and the experimental results agree well with the simulated results.

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