Exploratory Flow Visualization Investigation of Mast-Mounted Sights in Presence of a Rotor
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Exploratory Flow Visualization Investigation of Mast-Mounted Sights in Presence of a Rotor

Exploratory Flow Visualization Investigation of Mast-Mounted Sights in Presence of a Rotor


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About the Book

A flow visualization investigation with a laser light sheet system was conducted on a 27-percent-scale AH-64 attack helicopter model fitted with two mast-mounted sights in the langley 14- by 22-foot subsonic tunnel. The investigation was conducted to identify aerodynamic phenomena that may have contributed to adverse vibration encountered during full-scale flight of the AH-64D apache/longbow helicopter with an asymmetric mast-mounted sight. Symmetric and asymmetric mast-mounted sights oriented at several skew angles were tested at simulated forward and rearward flight speeds of 30 and 45 knots. A laser light sheet system was used to visualize the flow in planes parallel to and perpendicular to the free-stream flow. Analysis of these flow visualization data identified frequencies of flow patterns in the wake shed from the sight, the streamline angle at the sight, and the location where the shed wake crossed the rotor plane. Differences in wake structure were observed between the sight configurations and various skew angles. Analysis of lateral light sheet plane data implied significant vortex structure in the wake of the asymmetric mast-mounted sight in the configuration that produced maximum in-flight vibration. The data showed no significant vortex structure in the wake of the asymmetric and symmetric configurations that produced no increase in in-flight adverse vibration. Ghee, Terence A. and Kelley, Henry L. Unspecified Center RTOP 505-59-36-01; RTOP 282-10-01-01...


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Product Details
  • ISBN-13: 9781722223472
  • Publisher: Createspace Independent Publishing Platform
  • Publisher Imprint: Createspace Independent Publishing Platform
  • Height: 279 mm
  • No of Pages: 38
  • Spine Width: 2 mm
  • Width: 216 mm
  • ISBN-10: 1722223472
  • Publisher Date: 05 Jul 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 113 gr


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Exploratory Flow Visualization Investigation of Mast-Mounted Sights in Presence of a Rotor
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