, 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
openaire +1 more source
Controlling the flow loss of a supersonic compressor rotor using the blade slotting method
Advances in Mechanical EngineeringThe flow loss in the blade passage of a supersonic compressor rotor mainly comes from the boundary layers on the blade surface and end wall, the shock wave, the shock wave/boundary layer interaction, and tip leakage flow; the instability is mainly caused
Xinlong Ye, Zhenggui Zhou
doaj +1 more source
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
core +1 more source
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
Recent advances in multidisciplinary optimization of rotorcraft [PDF]
A joint activity involving NASA and Army researchers at NASA LaRC to develop optimization procedures to improve the rotor blade design process by integrating appropriate disciplines and accounting for all of the important interactions among the ...
Adelman, Howard M. +2 more
core +1 more source
Rotor blade-vortex interaction [PDF]
The vortex lattice method has been extended to a single bladed rotor operating at high advance ratios and encountering a free vortex from a fixed wing upstream of the rotor. The predicted unsteady load distributions on the model rotor blade are generally
Mccormick, B. W.
core +1 more source
Analytical investigation of blade efficiency for two-dimensional supersonic turbine rotor blade sections [PDF]
Blade efficiency in producing vortex flow within two dimensional supersonic rotor blade ...
Goldman, L. J.
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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
core +1 more source
A parrot optimizer for solving multiobjective design sensor placement in helicopter main rotor blade. [PDF]
Sci RepAldawsari H.
europepmc +1 more source
Reconstruction of a three-dimensional, transonic rotor flow field from holographic interferogram data [PDF]
Holographic interferometry and computerized aided tomography (CAT) are used to determine the transonic velocity field of a model rotor blade in hover. A pulsed ruby laser recorded 40 interferograms with a 2 ft dia view field near the model rotor blade ...
Kittleson, John K., Yu, Yung H.
core +1 more source