Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – Casing with axial – conical flow runner
Patent
1982-09-27
1985-05-07
Scott, Samuel
Rotary kinetic fluid motors or pumps
Working fluid passage or distributing means associated with...
Casing with axial, conical flow runner
415 53T, 415168, 415207, F04D 2940
Patent
active
045155240
ABSTRACT:
A draft tube for discharging fluid from a hydraulic turbine is disclosed as having a draft tube wall surrounding a discharge passage which diverges from a turbine runner to a discharge opening. The draft tube includes a first region downstream of the runner which has a rate of divergence less than that at which boundary layer separation occurs. A second region, downstream from the first region, has a rate of divergence greater than that at which boundary layer separation normally occurs. The draft tube wall surrounding the second region is provided with a plurality of orifices. A plurality of nozzles are provided on the draft tube wall surrounding the first region. Piping connects the orifices with fluid inlets of the nozzles. The nozzles have fluid outlets which communicate with the discharge passage in the first region and open away from the turbine runner. Fluid along the wall in the second region passes through the orifices and piping and into the nozzles. The fluid is drawn from the nozzle into the fluid flow in the first region whereby boundary layers which would normally form along the wall in the second region are drawn off by the flow in the first region.
REFERENCES:
patent: 2709917 (1955-06-01), Bruynes
patent: 2948148 (1960-08-01), D'Anfreville et al.
patent: 2957306 (1960-10-01), Attinello
patent: 3456456 (1969-07-01), Rietdijk
patent: 4098073 (1968-07-01), Adkins et al.
patent: 4419045 (1983-12-01), Andre et al.
Grenzschichtbeeinflussung bei Diffusoren von Stromungsmaschinen, Dr. Ing K. Kaufman, 1957.
Allis-Chalmers Corporation
Bowman Brian J.
Conrad Timothy R.
Scott Samuel
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