曾超1,2，李杰1,2，钟绵远1,2，刘德柱1,2
1.内燃机可靠性国家重点实验室，山东 潍坊 261061；2.潍柴动力股份有限公司，山东 潍坊 261061
摘要：以某款牵引车为例，基于质量、动量、能量守恒方程建立机舱内流场仿真模型，采用一维-三维耦合的方法对机舱内流场进行仿真，经试验验证仿真模型正确可行。研究不同发动机、冷凝器前布置方式、风扇与散热器匹配、驾驶室底舱到发动机摇臂罩距离以及驾驶室到车厢的距离对机舱阻力因数（built-in resistance，BiR）的影响。结果表明，风扇与散热器的匹配关系对BiR影响最大。研究成果可为一维热管理仿真确定BiR提供参考。
关键词：BiR；散热器风量；耦合；流场仿真
Abstract：Taken a tractor as an example, 1D & 3D coupled simulation method based on mass, momentum and energy conservation are used to model flow field in engine compartment, which is validated by experiments. Different engine, arrangement in front of condenser, fan and radiator matching relations, distance between floor and the engine rocker cover, distance between the cab and carriage are simulated in order to study their influence on engine builtin resistance (BiR). It is found that the matching of fan and radiator is the main factor for BiR. This conclusion could be helpful for 1D thermal management simulation and the calculation of BiR.
Keywords: built-in resistance; radiator air volume; coupling; flow field simulation
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