Design And Optimization Of Fsc Formula Racing Car’s Air Intake System

According to FSC racing rules limit, every colleges and universities must have a diameter of less than 20mm’s districtor on their car’s air intake system. And for engine the air intake system acts as the respiratory tract, its shape and structure parameters directly affect the air intake efficiency of engine, which affect the dynamic performance of engine. Therefore, the air intake system plays a key role in the process of research and development of engine power. In order to improve the air intake efficiency and reduce the loss of engine power after the limiting of air, in this paper the CBR600 RR engine’s air intake system of the flow field characteristic is analyzed and structure is optimized.First of all, analysis the factors that influence the efficiency of air intake system and its improving measures, and study the energy loss and the air flow dynamic effect and the inertia effect in the inlet pipe. The GT-Power software is used to modeling the engine, the volume of the cavity and length of the manifold’s influence to the engine performance are analyzed and determined the manifold’s length is 280 mm, and the cavity’s volume is 3L. Determine the arrangement of the air intake system and establish the 3D model, and this model mainly contains the front pipe, intake districtor, rear pipe, pressure stabilizing cavity and manifold. Then based on the theory of computational fluid dynamics, the CFD software Fluent is used to analysis the intake districtor, and best export diffusion angle is determined. Then the flow field of air intake system is analyzed and improved, in order to balance the cylinder air inflow, wind cups are set in pressure stabilizing cavity, by optimizing the height of the wind cups to adjust the balance of the air intake.Some part of the air intake system parameters are determined through the one-dimensional simulation of engine working cycle in this paper, and coupled with three-dimensional CFD fluid analysis, the air intake system is designed and optimized. The final research shows that the quality and velocity of the manifold outlet flow are improved, and the inlet air flow in the system becomes more stable, the loss of energy is reduced. The efficiency of the air intake is improved, and the engine can work with a good performance. So this paper can provide theoretical basis for later design about FSC car’s air intake system, it has a certain reference value.