摘要 |
A fountain ( 50 ) comprises a supply of water under pressure, a primary fluidic diverter ( 10 ) having an input ( 12 ) for said supply, and first and second outputs ( 16 a, b) diverging from said input. Two control ports ( 20 a, b) are provided with control flow to direct input flow to one or other of the two outputs that lead to the two inputs of a vortex amplifier ( 40 ). This comprises a vortex chamber ( 54 ), a radial port ( 50 ), a vortex inducing port ( 60 ) and an axial output port ( 58 ). One ( 16 a) of the diverter outputs is connected to the vortex inducing port, the other ( 16 b) to the radial port, so that supply to said axial output port is modulated by formation of a vortex in the chamber when flow is to the vortex inducing port. The axial port leads to a nozzle whereby a vortex spray or axial jet is produced, depending on which diverter output ( 16 a, b) is active. A wind detector ( 100 ) has a vertical jet ( 102 ) and a catcher ( 104 ) which fails to catch water from the jet in high wind conditions. The catcher feeds the control port ( 20 a) of a diverter 10 <SUB>1</SUB>, or such other pressure or flow detector as may be convenient. A fountain array of elements may comprise a number of diverters, the outputs of which have branches supplying the control ports of others in the array, whereby internal control is provided.
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