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Comparison of sound emission from two-blade, four-blade, and seven-blade propellers

Chester W Hicks, Harvey H. Hubbard

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Abstract

Abstract : Appreciable sound-pressure reduction may be realized by changing from two blades to seven blades for comparable operating conditions. Small reduction in intensity may be realized by increasing propeller diameter for same tip speed and power absorbed. AT fixed pitch setting, sound-intensity levels expressed in decibels are approximately a linear function of tip speed for test Mach number range for all propellers tested. For same tip speed and power absorbed, seven blades are only slightly less loud than two blades at distances greater than 400 ft even though difference in sound pressure is large.

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Abstract : Appreciable sound-pressure reduction may be realized by changing from two blades to seven blades for comparable operating conditions. Small reduction in intensity may be realized by increasing propeller diameter for same tip speed and power absorbed. AT fixed pitch setting, sound-intensity levels expressed in decibels are approximately a linear function of tip speed for test Mach number range for all propellers tested. For same tip speed and power absorbed, seven blades are only slightly less loud than two blades at distances greater than 400 ft even though difference in sound pressure is large.

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Available abstract

Abstract : Appreciable sound-pressure reduction may be realized by changing from two blades to seven blades for comparable operating conditions. Small reduction in intensity may be realized by increasing propeller diameter for same tip speed and power absorbed. AT fixed pitch setting, sound-intensity levels expressed in decibels are approximately a linear function of tip speed for test Mach number range for all propellers tested. For same tip speed and power absorbed, seven blades are only slightly less loud than two blades at distances greater than 400 ft even though difference in sound pressure is large.

Key concepts: Blade (archaeology), Mach number, Acoustics, Sound intensity, Sound pressure, Propeller, Sound power, Intensity (physics)

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Comparison of sound emission from two-blade, four-blade, and seven-blade propellers — Research Paper | ScholarLens