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This article focuses on the key modified components that affect air resistance of a certain commercial vehicle model, including the air deflector, rearview mirror, and front face assembly. Through CFD numerical simulation method, multiple schemes of aerodynamic drag reduction optimization design are carried out for streamlined air deflector, rearview mirror, and front face assembly. At the same time, reserve schemes of aerodynamic drag reduction optimization design are also carried out for the modified vehicle model. On the one hand, the measured drag reduction effect of each optimized component was verified through actual vehicle wind tunnel tests. The results showed that compared to the current state, the new modified state had an effective drag reduction effect. Among them, the new modified state of the wide box model achieved a drag reduction of 16.6%, the new narrow box model achieved a drag reduction of 7.6%, and the new rearview mirror achieved a drag reduction of 8 counts, The new front exterior assembly (front bumper, front grille, corner panel, and headlights) achieved a drag reduction of 9 counts. In the reserve plan, the addition of tail wings, side skirts, and corrugated surfaces to the cargo compartment significantly reduced the drag, achieving a drag reduction of 20.7%.Research and comparison were conducted on the effectiveness, weight, and cost of reducing wind resistance of the deflector components. A correlation study was conducted from CFD simulation analysis, wind tunnel testing, fuel consumption simulation analysis, sliding resistance testing, to fuel consumption testing. The power economy simulation results showed that under GVW4.5T state, the wind resistance decreased by 1%, while the comprehensive fuel consumption of C-WTVC decreased by 0.31%.
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