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In-Flight Measurement of Propeller Noise on the Fuselage of an Airplane

In-Flight Measurement of Propeller Noise on the Fuselage of an Airplane

          
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About the Book

In-flight measurements of propeller noise on the fuselage of an OV-10A aircraft were obtained using a horizontal and a vertical microphone array. A wide range of flight conditions were tested including changes in angle of attack, sideslip angle, power coefficient, helical tip Mach number and advance ratio, and propeller direction of rotation. Results show a dependence of the level and directivity of the tones on the angle of attack and on the sideslip angle with the propeller direction of rotation, which is similar to results obtained in wind tunnel tests with advanced propeller designs. The level of the tones at each microphone increases with increasing angle of attack for inboard-down propeller rotation and decreases for inboard-up rotation. The level also increases with increasing slideslip angle for both propeller directions of rotation. Increasing the power coefficient results in a slight increase in the level of the tones. A strong shock wave is generated by the propeller blades even at relatively low helical tip Mach numbers resulting in high harmonic levels. As the helical tip Mach number and the advance ratio are increased, the level of the higher harmonics increases much faster than the level of the blade passage frequency. Pla, Frederic G. and Ranaudo, Richard and Woodward, Richard P. Glenn Research Center...


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Product Details
  • ISBN-13: 9781729359976
  • Publisher: Independently Published
  • Publisher Imprint: Independently Published
  • Height: 280 mm
  • No of Pages: 60
  • Spine Width: 3 mm
  • Width: 216 mm
  • ISBN-10: 1729359973
  • Publisher Date: 29 Oct 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 163 gr


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In-Flight Measurement of Propeller Noise on the Fuselage of an Airplane
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