PERFORMANCE OF MINIMUM ENERGY STRUCTURE OUTLETS NEAR MAXIMUM EXPANSION RATES

The performance of minimum energy waterway outlet fans designed to operate at critical conditions at design flow has been measured in laboratory experiments on models of outlets. The results showed that the performance of the outlets was sufficiently close to theoretical predictions to satisfy normal design requirements provided the ratio, (length/ maximum flow width), was not less than 1.25 and the area expansion ratio was not greater than 1.8. For such outlets, the behaviour can be predicted sufficiently well with simple one dimensional flow theory. Measured energy losses in such outlets were very small, of the same order as those calculated from the effects of boundary shear alone. However, exit losses may be substantial and must be taken into account in the overall design of the waterway (A).

  • Availability:
  • Corporate Authors:

    Institution of Engineers

    11 National Circuit
    Barton, A.C.T.,   Australia 
  • Authors:
    • Johnson, T
    • APELT, C J
  • Publication Date: 1990

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00604929
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS, ATRI
  • Created Date: Feb 28 1991 12:00AM