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Aerodynamic Performance Improvement of Renault Duster

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Aerodynamic Performance Improvement of Sport Utility Vehicle using CFD Analysis and Wind Tunnel Experiment By Mrs. Sangeeta Das

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Aerodynamic Performance Improvement of Renault Duster

  1. 1. Presented by Sangeeta Das 140370711008 Guided by Prof.Deman Sahu Mechanical Dept. PIET A Mid Semester Review Presentation On Aerodynamic Performance Improvement of Sport Utility Vehicle Using CFD Analysis and Wind Tunnel Experiment
  2. 2. Aerodynamics  A branch of fluid dynamics concerned with studying the motion of air, particularly when it interacts with moving objects.  Aerodynamics study can be divided into -  External Aerodynamics- Flow around solids Internal Aerodynamics- Flow through passages  Vehicular aerodynamics study mainly deals with External Aerodynamics.
  3. 3. The two enemies of speed are  Excess Drag ,commonly known as wind resistance .  Lack of down force or presence of lift .
  4. 4. Other Factors contributing to flow field around vehicle  Boundary Layer-: In the boundary layer around the vehicle ,the viscosity is dominant and it plays a major role in drag of the vehicle. Adds to effective body thickness ,creates skin friction drag  Separation of Flow Field:-  Flow separation creates a low pressure turbulent region known as wake. Wake contributes formation of pressure drag
  5. 5. Aerodynamics- Moments and Forces in a moving Vehicle
  6. 6. Type of Force Formula Remarks Lift Force CL = Lift Coefficient CD= Drag Coefficient CS = Side force Coefficient CPM = Pitching moment Coefficient CYM = Yawning moment coefficient CRM = Rolling moment coefficient A= Frontal area of vehicle V= Wind Velocity ρ = Air density Drag Force Side Force Pitching Moment Yawning Moment Rolling Moment
  7. 7. Challenges Faced by Automobile Industry  Increasing Fuel price  World moving towards low carbon economies  Competition  Emerging market demand for power hungry yet fuel efficient SUVs. Solutions: Better aerodynamics ,higher will be the speed of the vehicle . Better aerodynamics ,less work for engines . Better aereodynamics ,more stability of the car at high velocities .
  8. 8. Problem Definition
  9. 9.  Growing demand of SUV crossovers in India.  SUVs are oil guzzlers with large engines.  Large frontal areas and bluff-body shapes increases Cd.  Additional exterior modifications (fog lamps, roof rails etc) further increase Cd.  Matching aesthetics with improved aerodynamics for SUV is a bigger challenge.  The recently entered SUV in Indian market Renault Duster has a great demand even it has a drag co efficent of 0.42 . I aim to select the best modifications to improve its aerodynamic characteristics .
  10. 10. Objective
  11. 11. 1) To modify the external aerodynamics of Renault Duster for improving various parameters like  fuel consumption  drag co efficent  stability at high speed by addition of a vortex generator as an add on device . 2) To decide on type and geometry of vortex generators best suited for the prototype selected for the present study based on car aesthetics , ease of installation and improvement in aerodynamics.
  12. 12. Modeling
  13. 13. The die cast model of Renault Duster obtained from Renault France as shown below. The model is a 1:43 scale down model.
  14. 14.  The dimensions available in the public domain as well as practically measured have been verified with the die cast model and a 3D model of the car is made using CREO software .
  15. 15. The model used for the wind tunnel test is 3D printed in Vexma Technologies Pvt. Limited. It is a 1:20 scale down simplified model based on the 3D CREO model . 3D printed car model 3D printed VG
  16. 16. Wind tunnel facility located at SVIT ,Vasad ,Aero.Deptt.
  17. 17. Test Section
  18. 18. Anemometer &Digital Force Indicator Multitube manometer setup
  19. 19. Type Open return wind tunnel Test Section 300x300x1000 mm Blower fan 5 blades -Aluminium die cast A.C.Motor 3 HP -2880RPM Speed Variation 10% to 100% frequency Drive Controller Air Velocity 2-30 m/s Multitube manometer 16 PVC tubes,0-90 inclination ,acrylic single block Anemometer Velocity range:0-30m/sec:Display:Digital Strain gauge balance Two channel, Capable of measuring lift force upto 20 kg, drag force up to 20 kg Air Length 9:5 m Digital force indicator Two channel, Capable of measuring lift force upto 20 kg, drag force up to 20 kg Lift/Drag force sensor 0-20kg-2 channel/0.01kg resolution
  20. 20. Car model with pressure tappings Pressure Point 2 Pressure Point 3 Pressure Point 4 To measure the static pressure on the car body,0.4 mm diameter holes are drilled on the center line of the vehicle body starting from the front end along the roof to the rear end of the vehicle. Pressure Point 2
  21. 21. The car model is mounted in the test section connecting dirctly to the digital force sensors . The wind tunnel tests are performed at different velocities within a range of 10 to 25 m/s . The pressure distribution readings are taken along the symmetry plane through the multi tube manometer.
  22. 22. Tapped pts. Velocity Dists.(m/s) 10 15 20 25 1 -10 -12 -16 -19 2 15 18 23 25 3 -5 -7 -11 -14 4 -12 -15 -18 -21 Tapped pts. Velocity Dists.(m/s) 10 15 20 25 1 -10 -12 -14 -18 2 13 16 23 25 3 -5 -7 -11 -14 4 -5 -8 -11 -15 Pressure values in mm at different tapping points at different velocities for base model Pressure values in mm at different tapping points at different velocities with VG
  23. 23. -80 -60 -40 -20 0 20 40 60 80 100 1 2 3 4 25 20 15 10 Pressure distribution at different velocities for base model
  24. 24. -80 -60 -40 -20 0 20 40 60 80 100 1 2 3 4 25 20 15 10 Pressure distribution at different velocities with vortex generator
  25. 25. 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2 10 15 20 25 With VG Base model Comparison of lift force for base model and VG
  26. 26. Work Particulars Jun July Aug Sept Oct Nov 2015-2016 WEEK 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 4 1 2 3 4 Problem Selection Confirmation of dissertation topic Objective of Project Literature review Scope of work Definition of problem
  27. 27. Work Particulars-2015- 2016 Dec. Jan. Feb. March April may WEEK 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 Purchasing of original die cast model & dimension varification Modelling of car body using Pro-E Preparation of 3D printed model for experiment Experiment in Wind Tunnel Analysis using ANSYS Preparation for final presentation
  28. 28. Thank you

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