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为了验证TR燃烧系统降低发动机排放、实现低温预混合燃烧的能力,在一台经过改造的单缸135柴油机上进行了降低压缩比、燃用柴油-乙醇混合燃料和推迟供油的试验研究。结果表明,压缩比ε降低后,着火推迟,最大放热率增加,缸内最高压力和最高温度降低,NOx排放也降低。但是中高负荷时燃烧速率降低,有效油耗率增加。当燃用乙醇体积含量20%的乙醇-柴油混合燃料时,与燃用柴油燃料相比,着火延迟期延长,烟度大幅度降低。小负荷时缸内最高压力、最高温度、最大放热率和燃烧速率都降低,NOx降低较多;中高负荷时最大放热率高于后者,燃烧速率提高,NOx降低得较少。当供油定时从15°CABT-DC推迟到13°CABTDC后,烟度基本不变。
In order to verify the TR combustion system to reduce engine emissions, and to achieve the ability of low-temperature premixed combustion, a modified single cylinder 135 Diesel engine to reduce the compression ratio, diesel-ethanol fuel combustion and postponed fuel supply pilot study. The results show that after the compression ratio ε is decreased, the ignition is delayed, the maximum heat release rate increases, the maximum pressure and the maximum temperature in the cylinder decrease, and the NOx emission also decreases. However, the combustion rate decreases at medium and high loads, and the effective fuel consumption rate increases. When using a 20% ethanol-ethanol blend of ethanol, the ignition delay is extended and the smoke is significantly reduced compared to that of diesel fuel. The maximum pressure, the maximum temperature, the maximum heat release rate and the combustion rate in the small load are reduced, NOx is more reduced; the maximum heat release rate is higher than the latter in medium and high load, the combustion rate is increased, NOx reduced less. After the fueling timing was postponed from 15 ° CABT-DC to 13 ° CABTDC, the smoke level remained essentially unchanged.