Effect of pressure and temperature on oil mist sprays used for blade excitation in high cycle fatigue testing
Thompson, Andrew P.
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The flow patterns of two oil mist nozzles used in rotor blade excitation experiments were characterized using a Laser Doppler Velocimeter (LDV). Both nozzles were operated in a vacuum test chamber and velocity measurements were taken at three axial distances from the nozzle exit, at three or four different pressures, at three different temperatures. The 4 gallon per hour "mini-mist" nozzle produced a "referenced velocity" consistent with a hollow cone at each axial location, pressure, and temperature. The temperature of the oil flowing through the 4 gallon per hour nozzle did not affect the nozzle's performance. The 6 gallon per hour "standard" nozzle produced a "solid" cone structure at each axial location, pressure, and temperature. The temperature of the oil flowing through the 6 gallon per hour nozzle did affect the nozzle's performance. The spray pattern quantification can be used to design blade excitation experiments in high cycle fatigue (HCF) vacuum spin tests.
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