内燃兰金循环发动机爆震控制试验  

Experimental Study of Knock Control in an Internal Combustion Rankine Cycle Engine

作　　者：康哲[1] 付乐中 邓俊[1] 吴志军[1] 

机构地区：[1]同济大学汽车学院,上海201804

出　　处：《同济大学学报（自然科学版）》2017年第7期1030-1036,共7页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金重大研究计划(91441125);国家自然科学基金(51076118)

摘　　要：基于一台改造的双缸柴油机,结合自行开发的进气及缸内高温水喷射系统,针对高压缩比、高氧浓度下内燃兰金循环发动机爆震工况开展试验研究.结果表明,与空气进气相比,高氧浓度进气会导致爆震出现,通过对缸内压力进行傅里叶变换和带通滤波后得到的爆震强度可达0.26 MPa.在爆震工况下结合缸内高温高压水喷射策略,可以有效抑制爆震强度,维持缸内燃烧过程稳定,与此同时,高温高压水吸热蒸发汽化,有效提高系统热效率.Based on a retrofitted two-cylinder diesel engine, combined with a self-designed intake and direct high temperature water injection system, the knock condition existed in internal combustion rankine cycle engine have been investigated at a high compression ratio and high oxygen fraction. The results show that compared with air intake, the knock occurred results in a high oxygen faction and the knock intensity （KIA） calculated from in-cylinder pressure Fourier transfer and band-pass filtering reaches 0.26 MPa. The knock frequency is controlled by utilizing a suitable direct water injection strategy and the combustion stability is sustained. Meanwhile, the injected high temperature and pressure water evaporate after heat absorption, which improves system thermal efficiency effectively.

关 键 词：内燃机 内燃兰金循环 纯氧燃烧 缸内喷水 爆震控制 

分 类 号：TK43[动力工程及工程热物理—动力机械及工程]