某船用柴油机匹配STC系统性能计算分析

Performance and Analysis of a Marine Diesel Engine Matching STC System

基于某船用柴油机性能测试台架,利用GT-Power软件建立TBD234V6型柴油机常规增压和STC(相继增压)系统整机模型模拟计算,研究了不同工况下的燃烧和排放等性能参数。结果表明:该机在推进特性工况下,STC系统对柴油机在低负荷时的性能有明显改善,其中包括,爆压和增压压力显著提高;油耗和涡前排温明显降低;与原机相比,缸内NOx浓度也明显下降。为其他船用柴油机采用相继增压系统提供了借鉴。

Based on the performance test bench of a marine diesel engine,the GT-Power software was used to establish the model calculation of the conventional turbocharger and STC( Sequential Turbo Charging) system of TBD234V6 diesel engine,and the performance parameters of combustion and emission under different working conditions were studied. The results show that the diesel engine is under the propulsion characteristics,the STC system has obviously improved the performance of the diesel engine under low load conditions,the explosion pressure and boost pressure are significantly improved,and the fuel consumption and vortex front discharge temperature are significantly reduced. Compared with the conventional pressurization of the original machine,the NOx concentration in the cylinder is also significantly reduced. It provides a reference for other marine diesel engines to use the systems of sequential turbo charging.