Effect of cylinder wall temperature on marine engine combustion
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With the strengthening of fuel-efficiency regulations for marine engines, many studies are underway to enhance their effi-ciency. To achieve greater fuel efficiency, ship operating speeds are reduced. However, a reduction in the ship speed significantly lowers the temperature of the cylinder liner wall, leading to increased heat loss owing to the enhanced heat transfer to the cooling water. This study presents a detailed analysis of the effect of the surface temperature of the cylinder liner in long-stroke marine engines on fuel spray and combustion. A detailed analysis is conducted on the effect of the surface temperature of the cylinder liner in a slow-speed marine engine on fuel spray and combustion. This study analyzes parameters such as the penetration and distribution of the fuel spray, variations in the combustion speed, distribution of OH radicals representing the combustion boundary layer, and the generation processes of combustion products such as NO and CO. The analysis indicates that, for a comprehensive consideration of combustion efficiency and exhaust emissions, maintaining the cylinder liner wall temperature within the range of 150 to 180 °C is desirable.
Abstract
With the strengthening of fuel-efficiency regulations for marine engines, many studies are underway to enhance their effi-ciency. To achieve greater fuel efficiency, ship operating speeds are reduced. However, a reduction in the ship speed significantly lowers the temperature of the cylinder liner wall, leading to increased heat loss owing to the enhanced heat transfer to the cooling water. This study presents a detailed analysis of the effect of the surface temperature of the cylinder liner in long-stroke marine engines on fuel spray and combustion. A detailed analysis is conducted on the effect of the surface temperature of the cylinder liner in a slow-speed marine engine on fuel spray and combustion. This study analyzes parameters such as the penetration and distribution of the fuel spray, variations in the combustion speed, distribution of OH radicals representing the combustion boundary layer, and the generation processes of combustion products such as NO and CO. The analysis indicates that, for a comprehensive consideration of combustion efficiency and exhaust emissions, maintaining the cylinder liner wall temperature within the range of 150 to 180 °C is desirable.
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