HC4132柴油机涡轮增压系统有用能量流研究

Study on Useful Energy Flow for Turbocharging System of HC4132 Diesel Engine

基于HC4132柴油机试验,对柴油机废气涡轮增压系统有用能量流分布规律进行了研究。通过研究柴油机排气能量在涡轮-压气机-中冷器中的传递过程,得出涡轮回收排气能量的潜力和增压系统的能量流特性。废气涡轮增压系统回收的能量主要是排气的热力学能和压力能;外特性中高转速回收的余热能约为余压能的3倍,动能可以忽略,涡轮能回收大约25%的排气最大可用能量,而这部分能量大部分被中冷器带走,余下1.5%~6%的排气最大可用能量转换为进气压力能和热力学能。研究结果为提高柴油机热效率、节能和采用复合涡轮增压回收排气能量提供了依据,同时可用作各种柴油机排气能量回收方式横向比较的基础数据。

The distribution law of useful energy based on HC4132 diesel engine test. Potentials flow for turbocharging system of diesel engine was studied for turbine recovering ability of exhaust energy and energy flow characteristics of turbocharging system were achieved by studying the transfer process of diesel exhaust energy in turbine-compressor-intercooler system. The energy recovered by exhaust driven turbocharging system is mainly composed of internal energy and pressure energy of the exhaust. The remaining internal energy is three times much of the remaining pressure energy at medium and high speed. Kinetic energy can be ignored. The turbine can recover 25% maximum available energy of the exhaust, most of which dissipates through intercooler. The remaining 1.5%-6% maximum available energy converts to intake pressure energy and internal energy. The results provide reference for thermal efficiency increase of diesel engine, energy saving and exhaust energy recovering by compound turbocharging. Meanwhile, the results can be used as fundamental data for comparison between recovering methods of exhaust energy.