EXPERIMENTAL INVESTIGATION OF CONICAL PERIPHERAL JET NORMALLY IMPINGING ON A FLAT PLATE

Ibrahim A. M. Gad

Abstract


A new configuration peripheral air jet model of annular-conical convergent nozzle
positioned in proximity with a flat plate to create air cushioned in between with high pressure
is investigated experimentally. Different model configurations obtained by varying some jet
parameters like as; annular thickness ti , conic angle
􀯝
, nozzle-plate spacing 􀜮􀯝 and jet
velocity 􀜸􀯝 are tested. The time average pressure distributions at the created air cushion and its
surroundings; impinged plate, platform, nozzle exit and plenum chamber are measured. A
power-height parameter 􀜥􀯛􀯗 which serves as a good measure for the relative power
requirements of selected nozzle configurations is calculated by the exponential potential theory
and estimated from the present measurements. The experimental results of 􀜥􀯛􀯗 has the same
trend as its predicted values with reasonable differences. In all configurations the ratio of
nozzle-plate spacing to upper platform diameter 􀜮􀯝⁄􀜦􀯖 has strong effects on cushion
characteristics and 􀜮􀯝⁄􀜦􀯖 = 0.1 may be considered as a critical value over which the cushion
begins to explode producing irregularly with time

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