CONTRIBUTION TO THE THEORETICAL AND EXPERIMENTAL STUDY OF AIR FLOW ROUND A TWO-DIMENSIONAL VEHICLE PROFILE

CONTRIBUTION A L'ETUDE THEORIQUE ET EXPERIMENTALE DE L'ECOULEMENT AUTOUR D'UN PROFIL BIDIMENSIONNEL E VEHICULE AUTOMOBILE

The detached, 2-dimensional air-flow around a motor vehicle profile is represented as a laplacian field by likening the wake boundary to lines of flow and supposing that the pressure within the wake area is constant. Calculation is made on an open contour using the method of discrete distribution of singularities. The singularities are of the source, sink and eddy types. This calculating scheme forms the first approximation for the wake observed in the wind tunnel. The position of the detached points is determined so as to satisfy different conditions corresponding to physical observations. Pressure distribution over the profile and the aerodynamic coefficients of drag and lift calculated according to the scheme are compared with those measured in the wind tunnel. Calculated pressure would appear to agree fairly well. However, it is not possible to simultaneously agree with all hypothesis of the model. This remark shows that the wake modelling is too coarse. Work is under way with a view to improving the calculation prior to generalizing three-dimensional air-flows. /Author/TRRL/

• Supplemental Notes:
  • Sixteenth International Automoible Technical Congress.
• Corporate Authors:

  International Federation of Auto Techniques Engs

  3 Avenue du President Wilson
  F 75116 Paris,   France 

  International Federation of Auto Techniques Engs

  3 Avenue du President Wilson
  F 75116 Paris,   France 
• Authors:
  • Chometon, F
  • Fontanet, P
  • Migeot, J C
• Publication Date: 0

Language

• French

Media Info

• Pagination: p. 1
• Serial:
  • Publication of: International Federation of Auto Techniques Engs
  • Issue Number: 0
  • Publisher: International Federation of Auto Techniques Engs

Subject/Index Terms

• TRT Terms: Aerodynamic lift; Aerodynamics; Air; Conferences; Drag; Flow; Mathematical models; Motor vehicle bodies; Motor vehicles; Pressure; Shape; Tunnels; Vehicle design; Wind; Wind tunnels
• Uncontrolled Terms: Air flow; Models; Pressure distribution; Two dimensional
• ITRD Terms: 5492: Aerodynamics; 6714: Air; 1356: Body (car); 8525: Conference; 5430: Flow (fluid); 6473: Mathematical model; 9073: Shape; 3374: Tunnel; 9083: Two dimensional; 2554: Wind
• Subject Areas: Bridges and other structures; Design; Highways; Safety and Human Factors; Vehicles and Equipment; I91: Vehicle Design and Safety;

Filing Info

• Accession Number: 00163328
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: Analytic
• Files: ITRD, TRIS
• Created Date: Mar 7 1978 12:00AM