摘要
在发动机设计开发过程中,需要评估进气歧管是否满足进气均匀性的标准。首先利用1D-3D耦合方法计算得到进气歧管的平均质量流量,然后将其作为三维数值计算的输入边界。利用fire软件对初始进气歧管进行CFD分析,计算出各缸的流量系数及其偏差。针对存在压力损失的部位进行优化,直到其进气均匀性满足标准。结果表明:通过1D-3D耦合方法可以为三维数值计算提供准确的输入边界;通过CFD方法可以发现进气歧管结构中对流动不好的部位;通过CFD方法进行优化设计分析已经成为进气歧管设计过程中的重要手段。
When a engine intake manifold is designed, an assessment should be done to determine the uniformity. First, 1D -3D coupling method is used to calculate and obtain the average mass flow of the intake manifold. These values are used as input boundary in 3 D numerical calcula- tion. The Fire software is used to analyze the initial intake manifold to obtain the flow coefficient of each cylinder and its deviation. Optimization to this part that loses pressure ensures the uniformity of the intake manifold. Results show that the method of 1 D -3 D coupling can provide the accurate input boundary for 3D numerical calculation and that the method of CFD helps to find the part with bad flow. The method of CFD is an important mean in the process of analyzing and designing of in- take manifolds.
出处
《内燃机与动力装置》
2014年第3期33-36,共4页
Internal Combustion Engine & Powerplant
关键词
进气均匀性
流量系数
耦合
Ari Intake Uniformity
Flow Coefficient
Coupling
