Abstract: To address the issue of throttle valve limiting engine power performance under formula student combustion China (FSCC) rules, and considering real vehicle space constraints, this study takes the CBR600rr engine as the object and performs computational fluid dynamics (CFD) simulation based on the k-ε turbulence model. The effects of inlet contraction angle, inlet expansion angle, and the angle between intake main pipe and manifold on intake performance are analyzed, and the optimal design parameters are obtained through parameter optimization. The results show that when the inlet contraction angle is 20°, the inlet expansion angle is 10°, and the intake main pipe-to-manifold angle is 123°, the total flow rate increases by 17.1% compared with the original design, and the unevenness of outlet flow rate of each cylinder decreases to 2.92%. The study reveals the influence mechanism of key structural parameters on engine intake flow, providing a theoretical basis and engineering reference for the design of intake systems for high-power density racing cars.

Key words: FSCC; intake system; CFD; inlet contraction angle; flow uniformity

摘要： 针对中国大学生方程式汽车大赛（FSCC）规则中限流阀限制发动机动力性能的问题， 结合实车空间约束，以 CBR600rr 发动机为对象，基于 k-ε 湍流模型进行计算流体动力学 （CFD）仿真，分析了进口缩角、进口扩角及进气总管与歧管夹角对进气性能的影响，并通 过参数优化获得最优设计参数。结果表明，当进口缩角为 20°、进口扩角为 10°、进气总管 与歧管夹角为 123°时，总流量相较于原设计增加 17.1%，各缸出口流量不均匀度降至 2.92%。 研究揭示了关键结构参数对发动机进气流动的影响机制，可为高功率密度赛车进气系统设计 提供理论依据与工程参考。

关键词: FSCC；进气系统；CFD；进口缩角；流量均匀性