摘要
为了提高车用内燃机变转速、变负荷面工况性能,提出了离心压气机优化设计方法,即通过考虑压气机设计工况与非设计工况流场的关联效应,抑制不同工况流场之间的差异,优化离心压气机结构.利用该方法对某柴油机离心压气机进行了优化设计,其设计工况与非设计工况之间的流场偏差集中在大叶片进口叶尖部分,据此提出了压气机前缘前掠的流场控制措施.仿真分析表明:改型离心压气机流场偏差得到了明显抑制,其设计工况性能变化较小,非设计工况压比提高了4.46%,,效率提高了1.56%,.
Optimization method was used to improve the performance of internal combustion engine operating under varied speed and load conditions. Characteristics of compressor flow fields under different working conditions were studied and compressor blades were optimized for the decrease of the difference of flow fields. As an example,a turbocharger centrifugal compressor of diesel engine was optimized using this method. The largest difference in flow fields appears at the tip edge of the main blades. The forward sweep blade was used to decrease the difference. Simulation results show that the largest difference in flow fields of the new centrifugal compressor is decreased significantly,and pressure ratio is improved by 4.46%, and efficiency by 1.56%, at the off-design point.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2015年第4期378-383,共6页
Transactions of Csice
基金
国家重点基础研究发展计划(973)资助项目(2011CB707204)
关键词
内燃机
涡轮增压
离心压气机
流场偏差
优化设计
internal combustion engine
turbocharging
centrifugal compressor
flow fields' difference
optimal design
