螺旋进气道形状和位置偏差对涡流比及流量系数的影响  

An Investigation of Effect of Shape and Position Deviations of Helical Inlet Port of DI Diesel Engines on Flow Coefficient and Swirl Ratio

作　　者：刘书亮[1] 沈捷[2] 刘德新[1] 李玉峰[1] 卓松芳[2] 邱瑞兴[2] 任立红[1] 肖浩栋[1] 

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072 [2]广西玉柴机器股份有限公司,玉林537005

出　　处：《燃烧科学与技术》2003年第5期397-403,共7页Journal of Combustion Science and Technology

摘　　要：螺旋进气道在铸造和机械加工过程中会出现各种各样的偏差,从而影响直喷式柴油机的动力经济性和排放特性.作者设计了几种机构来模拟不同类型的偏差,如带有倾斜误差的进气道、带有纵向胀大误差的进气道以及带有偏心误差的进气道等.在稳流试验台上检测气道的流动特性.实验结果表明,倾斜气道会显著影响涡流比.抬高气道入口端会明显降低涡流比,反之则涡流比提高;气道胀大会使流量系数和涡流比都降低;当偏心出现在气道出口方向时,涡流比略有增加;当偏心出现在气道入口方向时,涡流比会显著降低.The flow performance of the helical intake port has great influences on direct injection(DI) diesel engine combustion and performances. Many errors or deviations may occur during the casting and machining processes of the cylinder head. In this paper, a few sets of mechanism were designed for simulating different kinds of port deviation, e.g. port with inclination, vertical swelling and eccentric errors etc. The flow performance of the port was tested on a steady state flow rig. The results are as follows. The inclination of the inlet port influences greatly the swirl ratio of the port. Raising the entrance end of the port will lead to the reduction of the port swirl ratio, while reducing the entrance end of the port will lead to a higher port swirl ratio. The swelling of the inlet port will cause either flow coefficient or swirl ratio of the port to be reduced. As the eccentric deviation occurs at the direction of the exit of the port the swirl ratio will be increased a little, while the eccentric deviation occurs at the direction of the entrance of the port the swirl ratio will be reduced considerably. 

关 键 词：直喷式柴油机 螺旋进气道 形状位置偏差 流量系数 涡流比 

分 类 号：TK21[动力工程及工程热物理—动力机械及工程]