内燃机进排气变网格一维非定常流动计算方法  

Variable mesh computational method for one-dimensional unsteady intake and exhaust flows of internal combustion engines

作　　者：张琨 陈昊天 邓康耀[1] 胡志龙 钱跃华 刘博 ZHANG Kun;CHEN Haotian;DENG Kangyao;HU Zhilong;QIAN Yuehua;LIU Bo(Key Laboratory for Power Machinery & Engineering of Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China;Shanghai Marine Equipment Research Institute, Shanghai 200031, China;Shanghai Marine Diesel Engine Research Institute, Shanghai 201108, China;China Shipbuilding Power Engineering Institute Co., Ltd, Shanghai 200120, China)

机构地区：[1]上海交通大学动力机械及工程教育部重点实验室,上海200240 [2]上海船舶设备研究所,上海200031 [3]中国船舶集团有限公司第七一一研究所,上海201108 [4]中船动力研究院有限公司,上海200120

出　　处：《哈尔滨工程大学学报》2022年第6期809-816,920,共9页Journal of Harbin Engineering University

基　　金：高技术船舶科研计划.

摘　　要：针对内燃机进排气流动计算模型难以满足在现有计算效率的基础上提高计算精度的问题,本文推导建立了变网格一维非定常流动计算方法。在均匀网格TVD格式基础上,推导建立适用于内燃机进排气流动计算的非均匀网格TVD迭代格式,并结合自适应网格加密技术,建立可变网格一维非定常流动数值仿真计算方法。结果表明:与采用均匀网格的整机仿真模型相比,采用变网格计算20个循环平均增加CPU计算耗时2.08 s,排气压力波预测精度较均匀网格计算方案最大可提高5.15个百分点,整机性能预测精度较均匀网格最大可提高0.54个百分点。To improve the computational accuracy of the intake and exhaust flow calculation model of internal combustion engines,this study proposes a variable-grid,one-dimensional,and nonconstant flow calculation method on the basis of the existing computational efficiency.Adopting the uniform grid TVD format,a nonuniform grid TVD iterative format is derived and established to calculate the intake and exhaust flow of internal combustion engines.Combined with adaptive mesh encryption technology,a numerical simulation method of a one-dimensional unsteady flow with variable mesh is established.Results show that compared with the simulation model of the whole engine with a uniform grid,the average CPU calculation time of the model with a variable grid increases by 2.08 s for 20 cycles,the maximum prediction accuracy of the exhaust pressure wave can be improved by 5.15%,and the maximum prediction accuracy of the whole engine performance can be improved by 0.54%.

关 键 词：内燃机 进排气流动 变网格 TVD格式 一维 非定常流动 压力波 整机性能 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]