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本文首先叙述运用电子计算机,进行压缩过程中可变喉口截面预燃室中气体流动计算的方法,分析了可变喉口截面预燃室主要结构参数对主、副燃烧室压力变化、喉口气流速度和节流损失大小的影响,并导出相应的结论。其次是叙述在高增压单缸试验机上进行的37个方案对比试验的结果,并由此总结出可变喉口截面预燃室的最佳结构参数的范围,为设计提供了依据。试验表明,在(?)_e=17.26kgf/cm~2时,应用小直径喷嘴的可变喉口截面预燃室,在比油耗、排温大致相等时,可比常规产品预燃室爆压下降17kgf/cm~2(约13%)之多;在应用大直径喷嘴时,在排温相近时,爆压可下降12kgf/cm~2,比油耗可下降4～5g/ps.h.(约2.6%),并且负荷特性上比油耗曲线极为平坦。
In this paper, the calculation method of gas flow in the pre-combustion chamber with variable throat section during the compression process is described. The main structural parameters of the pre-combustion chamber with variable throat section are analyzed. Flow velocity and throttling loss, and derive the corresponding conclusions. Secondly, the results of the comparison of 37 schemes on the high-pressure single-cylinder testing machine are described, and the range of the optimum structural parameters of the variable throat section pre-combustion chamber is summarized, which provides the basis for the design. The experimental results show that the pre-combustion chamber with variable throat section with small diameter nozzle can reduce pressure than the pre-combustion chamber of the conventional product when the fuel consumption and the exhaust temperature are approximately equal to (?) _e = 17.26kgf / cm ~ 17kgf / cm ~ 2 (about 13%). When the nozzle diameter is large, the explosion pressure can be reduced by 12kgf / cm ~ 2 and the fuel consumption can be reduced by 4 ~ 5g / ps.h 2.6%), and the load characteristics of fuel consumption curve is extremely flat.