进气涡流对船用中速柴油机的性能影响

Impact of Intake Swirl on the Performance of Medium Speed Marine Diesel Engines

以某船用中速柴油机为研究对象,通过在气缸盖底面进气门座圈处增加不同的偏心倒角,获得不同进气涡流比和流量系数的组合。利用一维和三维仿真计算,研究不同组合对柴油机燃油消耗率、碳烟和NOx排放的影响,并通过试验对比验证。计算和试验结果均表明涡流比对该柴油机高、低工况性能的影响截然不同。最终选取不同的涡流比和流量系数组合方案,分别应用到不同的细分市场,以满足不同的性能需求。

Based on a certain medium speed marine diesel engine,different combinations of intake swirl ratios and flow coefficients were obtained by adding different eccentric chamfers at the intake valve seat rings on the bottom surface of the cylinder head.One-dimensional and three-dimensional simulation calculation methods were used to study the effects of different combinations on diesel engine fuel consumption,soot emissions,and NOx emissions,and experiments were carried out for verification.Both calculation and experimental results indicate that the swirl ratio has a completely different impact on the high and low operating conditions performance of the diesel engine.Different combinations of swirl ratio and flow coefficient were selected and applied to different segmented markets to meet varied performance requirements.