Abstract
The reliability of combustion chamber components is mainly determined by the thermal load of diesel engines. Under the plateau operation condition, diesel engine performance degradation and ablation area appear. Therefore, it is crucial to study the engine heat transfer phenomenon at different altitudes, of which the Woschni formula cannot meet the accuracy requirement. With the motive of modifying and calibrating the Woschni formula at different altitudes, a modified conjugate heat transfer (CHT) model of the combustion chamber and the cooling medium was proposed to analyze the temperature distribution of the cylinder head. The results indicated that relative errors were controlled within 5% under variant altitudes, comparing the temperature field of the numerical simulation with the single-cylinder engine experiment test data. Therefore, the modified in-cylinder conjugate heat transfer model can be used to predict the thermal load of diesel engine combustion chamber components under different altitude operating conditions.
Highlights
As a compact, wide power range, and adaptable power system, the internal combustion engine (ICE) is widely used in engineering and agricultural machinery, automobiles, motorcycles, national defense, and other fields (Ambrogi et al, 2019; Liu and Wang, 2022)
The in-cylinder heat transfer model has been modified based on simulation analysis and experimental verification
The results indicated that the modified heat transfer model can be used in variable altitude operating conditions, and the main conclusions are as follows
Summary
Wide power range, and adaptable power system, the internal combustion engine (ICE) is widely used in engineering and agricultural machinery, automobiles, motorcycles, national defense, and other fields (Ambrogi et al, 2019; Liu and Wang, 2022). Internal combustion engines will continue to be used as the primary source of power at high altitudes (Stocchi et al, 2019; Liu et al, 2022). There are many high-altitude roads and vehicles powered by diesel engines for highaltitude operations around the world (Liu and Liu, 2021a; Liu et al, 2021). It is found that as altitude increases, air density decreases, which causes many problems to the normal operation of the vehicle, such as insufficient power and localized ablation of the cylinder head and piston (Perez and Boehman, 2010; Liu and Liu, 2021b). These problems are because conventional heat transfer correlations are not well adapted to heat load prediction in high-altitude situations (Zhang et al, 2016; Liu and Liu, 2021c)
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