The reduction of the noise radiated by a vehicle requires the treatment of all dominant sources, one of them being the cooling system of the engine. The noise emitted by the cooling fan is influenced by various components of the cooling system and by those parts of the vehicle representing obstacles in the air flow. The paper is based on research work investigating all influencing parameters in many variations. The parameters considered are the type of the fan, the position of the fan, shape and position of the annular cowl, design of the shroud as well as type, size and position of the radiator core. The evaluation of the fundamental data obtained now permits an efficient design of low-noise cooling systems with axial-flow fan located downstream of the radiator for nearly all installation conditions in a vehicle. A design method is demonstrated for achieving an optimum noise level with respect to the bulk volume available and geometrical restrictions for the cooling system. As an example the application of this method is demonstrated for the improvement of the cooling system of a truck, resulting in a reduction in sound power of 9 dba additionally to an improvement in efficiency and heat rejection. For the covering abstract of the conference see TRIS 451834. (Author/TRRL)

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 31-40

Subject/Index Terms

Filing Info

  • Accession Number: 00451838
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: May 31 1986 12:00AM