Investigation of Anti-Phase Asymmetric Quiet Rotor Technology [PDF]
The future of urban air mobility has a well-known tall pole challenge in the form of community acceptance which largely comes from the noise. This paper presents a proposed anti-phase rotor technology that could reduce noise sources such as blade vortex ...
Cramer, Nicholas B. +3 more
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Evaluation of Rotor Blade Models for Rotor Outwash [PDF]
, 2018 In this work Computational Fluid Dynamics is used as a tool for rotor outwash evaluation. The paper\ud concentrates on the validation of the method, presents different modelling approaches and concludes with\ud suggestions on the use of the method for detailed simulations of rotor outwash.
Rovere, F. +4 more
openaire +1 more source
Wind-tunnel investigation of the effects of blade tip geometry on the interaction of torsional loads and performance for an articulated helicopter rotor [PDF]
The Langley transonic dynamics tunnel was used to determine the degree of correlation between rotor performance and the dynamic twist generated by changes in blade tip geometry using an articulated rotor with four different tip geometries at advance ...
Mantay, W. R., Yeager, W. T.
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Study on the impact of Gurney flap parameters on rotor performance improvement
Hangkong gongcheng jinzhanAt present, most of the research on installing Gurney flaps is focused on two-dimensional airfoils. The three-dimensional blade model is established to investigate the influence of different Gurney flap parameters on rotor aerodynamic performance ...
LIU Shaoteng +3 more
doaj +1 more source
A rotor-mounted digital instrumentation system for helicopter blade flight research measurements [PDF]
A rotor mounted flight instrumentation system developed for helicopter rotor blade research is described. The system utilizes high speed digital techniques to acquire research data from miniature pressure transducers on advanced rotor airfoils which are ...
Haywood, W. S., Jr. +2 more
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Rotor-vortex interaction noise [PDF]
A theoretical and experimental study was conducted to develop a validated first principles analysis for predicting noise generated by helicopter main-rotor shed vortices interacting with the tail rotor.
Amiet, R. K., Schlinker, R. H.
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Three-dimensional, transonic rotor flow field reconstructed from holographic interferogram data [PDF]
Holographic interferometry and computer-assisted tomography (CAT) are used to determine the transonic flow field of a model rotor blade in hover. A pulsed ruby laser records 40 interferograms with a 61 cm-diam view field near the model rotor-blade tip ...
Becker, F., Kittleson, J. K., Yu, Y. H.
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Performance Data from a Wind-Tunnel Test of Two Main-rotor Blade Designs for a Utility-Class Helicopter [PDF]
An investigation was conducted in the NASA Langley Transonic Dynamics Tunnel to evaluate an advanced main rotor designed for use on a utility class helicopter, specifically the U.S. Army UH-60A Blackhawk.
Singleton, Jeffrey D. +2 more
core +1 more source
, 2018 It is often difficult to predict the behavior of helicopters, given their complex aeromechanical operating environments. Given these uncertainties, it is often the case that flight tests need to be conducted prior to a design being "frozen". To improve the whole design and validation procedure, it is essential that the design freeze (and iterations ...
van de Kamp, Bram +1 more
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Vibratory Loads Data from a Wind-Tunnel Test of Structurally Tailored Model Helicopter Rotors [PDF]
An experimental study was conducted in the Langley Transonic Dynamics Tunnel to investigate the use of a Bell Helicopter Textron (BHT) rotor structural tailoring concept, known as rotor nodalization, in conjunction with advanced blade aerodynamics as ...
Hamouda, M-Nabil H. +5 more
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