中文摘要：

为了分析柴油机燃用小桐子油在怠速工况时的燃烧噪声及燃烧噪声的波动性,分别以柴油、柴油-小桐子掺混油、小桐子油、高温小桐子油为燃料,在单缸水冷四冲程柴油机上进行了怠速工况试验,测录了多循环的瞬时气缸压力,采用最高燃烧压力、压力升高率、压力升高加速度、气缸压力频谱曲线以及A声压级进行了对比。结果发现,柴油与掺混油、小桐子油与高温小桐子油的气缸压力频谱相似,柴油和掺混油的气缸压力级较大;对于同一工况,最大压力升高率越大且对应相位越迟,则燃烧噪声越大;18°供油提前角时,燃用高温小桐子油的A声压级低于柴油约7dB,21°供油提前角时低于柴油约5dB;燃用相同燃料,最大压力升高率的波动率降低均会减小A声压级的波动。

英文摘要：

In order to analyze the combustion noise and the fluctuation of multi-cycle combustion noise at idle condition of the diesel engine using curcas oil, the multi-cycle cylinder pressure at idle condition fueled with diesel, diesel-curcas mix oil, curcas oil and heated curcas oil were collected from a water-cooled four-stroke single cylinder diesel engine. The combustion noise and fluctuation of combustion noise were analyzed by maximum combustion pressure, pressure rising rate, pressure rising acceleration, cylinder pressure spectrum and A sound pressure level. The cylinder pressure spectrum burning diesel was similar to burning diesel-curcas mix oil, and burning curcas oil was similar to burning heated curcas oil. The cylinder pressure was high burning diesel and burning diesel-curcas mix oil. The combustion noise increased with increasing maximum pressure rising rate and with delaying corresponding phase of maximum pressure rising rate at the same condition. The A sound pressure level burning heated curcas oil was about 7 dB lower than burning diesel with 18°CA fuel supply advance angle, and was about 5 dB lower than burning diesel with 21°CA fuel supply advance angle. The fluctuation of the A sound pressure level decreased with the decreasing in cycle variation rate of the maximum combustion pressure rising rate.