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南京农业大学宁远车队宁远4号方程式赛车发动机进气系统为研究对象,运用三维软件CATIA建立发动机进气系统模型,并利用ANSYS Fluent对发动机进气系统模型进行流场分析优化;进气系统是发动机的重要组成部分,它的布置形式和结构参数对发动机的充气效率、进气阻力、进气均匀性、缸内混合气运动和燃烧过程有着重要的影响[1],从而影响发动机的动力性、经济性和排放特性。因此,进气系统的设计成为方程式赛车设计的重要部分之一。本文采用计算机辅助分析手段,将一维发动机工作过程循环模拟和三维CFD流畅分析结合,对原发动机进气系统进行改进。结果提高了质量流量和改善了四缸进气均匀性,减少了流动损失,在大赛要求20mm限流阀下,提高了发动机在中高转速时的转矩和功率。本文所采用理论和方法,可以为FSAE赛车的进气系统改进设计提供依据,在理论上和工程实践上都具有重要的价值和意义。
Nanjing Agricultural University Ningyuan Formula 4 racing engine intake system as the research object, the use of three-dimensional software CATIA to establish the engine intake system model and the use of ANSYS Fluent engine intake system model flow field analysis and optimization; intake system is the engine Of the important components, its layout and structural parameters of the engine’s inflatable efficiency, intake resistance, intake uniformity, cylinder gas mixture and combustion process has an important impact [1], thus affecting the engine power, Economic and emission characteristics. Therefore, the design of intake system becomes one of the important parts of formula racing design. In this paper, a computer-aided analysis method, the one-dimensional engine work cycle simulation and three-dimensional CFD smooth analysis of the original engine intake system to be improved. As a result, the mass flow rate was improved and the uniformity of the intake air of the four cylinders was improved and the flow loss was reduced. Under the requirements of the competition, the torque and the power of the engine at middle and high speeds were increased under the requirement of the 20 mm restrictor valve. The theory and method adopted in this paper can provide the basis for improving the design of the intake system of FSAE racing car and have important value and significance both in theory and engineering practice.