增压中冷柴油机燃用F-T柴油的燃烧、振动和噪声特性

Combustion,vibration and noise properties of F-T diesel in a turbocharged and inter-cooled diesel engine

为进行柴油机在线故障诊断、结构设计和优化，试验研究了噪声产生的机理、噪声随转速和负荷的变化。在4100QBZL增压中冷柴油机上，用费托（Fischer-Tropsch，F—T）合成柴油和0群柴油进行试验，测量了柴油机燃烧产生的表面振动信号。利用A计权网络，分析测量信号，进行柴油机故障诊断。结果表明：在0．5N2kHz测试工况条件下，这两种油品的声压级均到达峰值；噪声级为86．7～99dB。得到了在一个工作循环周期中的柴油机缸盖振动加速度的变化规律。相比于0群柴油，F-T柴油燃烧柔和、放热慢、压力升高缓慢、振动和噪声较小。这可为相关的故障诊断提供依据。

The noise/variation generate-mechanism and its variation law changing with engine speed and load were investigated by tests to realize diesel-engine on-line fault-diagnosis, and design and optimize engine- structure. The experiments were conducted in a turbocharged inter-cooled diesel engine fueled on Fischer- Tropsch （F-T） diesel or 0# diesel, in which measured were the surface vibration signals of engine combustion. The signals were analyzed by an A-Weighted network for diesel engine fault diagnosis. The results show that the sound pressure reach the peak for the two fuels with the noises in 86.7--99 dB at the frequencies of 0.5--2.0 kHz. The vibration acceleration variation law is obtained in a whole working cycle of cylinder head. The diesel engine fueled on F-T diesel has softer combustion, slower heat release rate, slower pressure rise rate, and smaller vibration / noise compared with the 0# diesel.