船用大功率柴油机瞬态工况油气响应及燃烧特性研究

Experimental Study on Dynamic Response and Combustion Characteristics of Marine High-Power Diesel Engine under Transient Conditions

关键词:  船用柴油机  燃烧分析  瞬态工况  动态响应  进气滞后

Key words:  Diesel engine  Combustion analysis  Transient conditions  Dynamic response  Inlet hysteresis

摘要:

针对船用大功率柴油机瞬态性能提升的需求，开展了增压中冷船用大功率柴油机瞬态工况动态响应及燃烧特性实验研究。研究表明，涡轮增压器惯性导致的进气滞后是柴油机瞬态工况下性能恶化的主要原因；突加载工况下，进气量响应滞后供油量响应4~5个工作循环，且进气量响应速度随初始负荷增加而增加，指示平均有效压力（Indicated Mean Effective Pressure，IMEP）等燃烧特征参数加载过程中响应速度较快，波动较小；缸内燃烧过程恶化，燃烧重心和燃烧终点较同负荷下稳态工况值均推迟。

Abstract:

The dynamic response and combustion characteristics of a supercharged intercooled marine high-power diesel engine under transient conditions are studied experimentally for the transient operating performance of the diesel engine. The study shows that the inertia of the turbocharger leads to the inlet hysteresis， which is the main reason for the deterioration of the performance under transient conditions. Under the sudden loading condition， the inlet response lags behind the fuel supply response for 4~5 working cycles， and the inlet response speed increases with the increase of the initial load. The combustion parameters such as indicated mean effective pressure （IMEP） respond faster and fluctuate less in the process of sudden loading. The combustion process in the cylinder deteriorates， and the center of gravity of combustion and the end of combustion are delayed compared with the steady-state condition value under the same load.