PRESSURE-FLOW-DISPLACEMENT CHARACTERISTICS OF A PERIPHERAL JET FLUID SUSPENSION

An experimental investigation of the pressure-flow-displacement characteristics of a peripheral jet fluid suspension is summarized. The effects of nozzle pressure ratio, Reynolds number, base recess and jet nozzle size on equilibrium and non-equilibrium characteristics are presented for a 30 deg. nozzle angle. It is shown experimentally that the effects of geometric scaling can be studied adequately by varying ambient pressure level. Inviscid performance theories were found to overestimate equilibrium cushion pressures from 40% at low jet thicknesses, low Reynolds numbers and high hover heights to less than 5% at opposite conditions. Mass flow rates and power requirements were found to be within 15% of the inviscid Barratt theory for the larger jet widths tested. Theories for non-equilibrium jet behavior were found to be inadequate for predicting pressure-flow and displacement-flow sensitivities needed in dynamic models of peripheral jet devices. Predicted discontinuities in these parameters were not observed experimentally. Experimental values of pressure-flow-displacement sensitivities derived from non-equilibrium performance data are presented. These results suggest that for comparable conditions the peripheral jet suspensions will experience higher maximum heave accelerations than corresponding plenum configurations. (Author)

  • Corporate Authors:

    Massachusetts Institute of Technology

    Engineering Projects Laboratory
    Cambridge, MA  USA 
  • Authors:
    • Richardson, H H
    • RIBICH, W A
    • Ercan, Y
  • Publication Date: 1968-6-1

Media Info

  • Pagination: 68 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00039014
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Contract Numbers: C-85-65t
  • Files: TRIS
  • Created Date: Nov 24 1973 12:00AM