Laser velocimetric flow mapping and characterization of oil mist nozzles used for blade excitation in high cycle fatigue testing
Vonderheide, Christopher M.
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The flow patterns of two oil mist nozzles used in rotor blade excitation experiments were flow mapped using a traversing Laser Doppler Velocimeter (LDV) system to determine the velocity and the overall characteristics were recorded photographically. The nozzles were operated in a vacuum test chamber and measurements were obtained at three different spray pressures, at three different axial distances from the nozzle exit. For a 4 gallon per hour (gph) "mini-mist" nozzle, a 'referenced velocity' was defined which was found to be constant within a hollow cone, and the cone geometry and oil flow rate changed linearly with the oil supply pressure. A 6 gph "standard" nozzle gave a solid cone, but only gave a pattern free of liquid streaks at low pressures. Oil temperature affected this behavior. The analytic quantification of the spray pattern can be used to design specific blade excitation experiments in high cycle fatigue (HCF) vacuum spin
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