Write a short note on various body optimization techniques for minimum drag.
Answers
Form Drag
- It was affected with the basis of the shapes to a vehicle body from drag by body engineer.
- They are positive aerodynamic forces in front of the vehicle and aerodynamic through the minimize the adverse effects through the rear to exhibit low.
- The total drag through about 55%
Lift Drag
- It is the result which is generated for any lifting force by moving the vehicle.
- The primary distribution with the wheels from the ground clearance to the contours to under grow and attracted for body.
Answer: Use of rear screen; Rear Fairing; Other Passive structural elements
Explanation:1. Use of rear screen allows a reduction in aerodynamic drag of the vehicle model under consideration by up to ~6.5%. Efficiency of rear screens from point of view of drag reducing equally depends on configuration, dimensions and arrangement of screens as well as on model’s rear part configuration. The external mount of spare tire can be arranged to reduce drag.
2. Rear fairing as part of flow separation area behind the vehicle can reduce aerodynamic drag of the vehicle with investigated configuration, by up to 26%. These results can be used at analysis of accuracy of calculation methods for defining aerodynamics of vehicles with separated areas. The results can also be useful for designers and design engineers in selection of vehicle external configuration.
3. The other passive options also have potential to reduce drag. Front structural elements showed decrease in drag coefficient up to 2.24% and vortex generator showed a decrease up to 1.24%. There is scope to achieve additional improvement with the understanding of flow field and optimization of design.