race car aerodynamics mer331 term project
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Race Car Aerodynamics MER331- Term Project. Purpose Characterize the aerodynamic performance of radio controlled vehicles Methods Surface Pressure Distribution Measurement Lift/Drag Force Measurements PIV (Particle Image Velocimetry) CFD (Computational Fluid Dynamics).

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Presentation Transcript
slide2
Purpose
  • Characterize the aerodynamic performance of radio controlled vehicles

Methods

  • Surface Pressure Distribution Measurement
  • Lift/Drag Force Measurements
  • PIV (Particle Image Velocimetry)
  • CFD (Computational Fluid Dynamics)
the impact of aerodynamics on vehicle shape
The Impact of Aerodynamics on Vehicle Shape
  • Compare two race cars
  • Both were designed for the Indy 500

Why are they so different?

  • Streamlining
  • Aerodynamic Down Force
lift dr jekyll
Lift - Dr. Jekyll

Down force (Negative Lift)

  • Down force increases a tires capability to produce cornering force
  • Down force stabilizes vehicles at high speed
  • Improves braking performance
drag mr hyde
Drag - Mr. Hyde
  • Reduces top speed
  • Helps chasing cars to draft and catch up
  • Reduces effective power of engine
aerodynamic down force and vehicle performance
Aerodynamic Down Force and Vehicle Performance

Source: Race Car Aerodynamics, J. Katz, 1995

radio controlled racing
Radio Controlled Racing
  • Perfect size for the Union wind tunnel
  • Can outfit with many body styles
  • Fast enough that aerodynamics affect handling
the vehicles

(a)

(c)

(e)

(b)

(d)

The Vehicles

(a) Ford Taurus NASCAR racer (c) baja Beetle

(b) 1969 Dodge Charger (General Lee) (d) a Mini Cooper

(e) Nissan P-35 LeMans Style prototype racer

the instrumentation
The Instrumentation

Two models required for each body type

  • PIV, Lift/Drag Test Model
  • Surface Pressure Model
tools
Tools

Wind Tunnel

Dynamometer

Particle Image Velocimetry

the experiments
The Experiments
  • Surface Pressure Measurements
  • Lift and Drag Tests
  • Computational Fluid Dynamics
  • Particle Image Velocimetry Tests
  • Final: Oral Presentations and Report
questions
Questions?

References:

  • Katz, J., Race Car Aerodynamics, Robert Bentley Publishing, 1995
  • Jeremy Losaw, ME Class of 2002

Funded by the National Science Foundation (CCLI-9950521)

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