Journal ArticleDOI
Analytical Approach to the Induced Flow of a Helicopter Rotor in Vertical Descent
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This article is published in Journal of The American Helicopter Society.The article was published on 1990-01-01. It has received 21 citations till now. The article focuses on the topics: Helicopter rotor & Descent (aeronautics).read more
Citations
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On the Vortex Wake of an Animal Flying in a Confined Volume
TL;DR: In this paper, the problem of hovering and slow flight within a confined volume is considered by a theoretical model based on helicopter practice, and by flow visualization experiments, and it is conjectured that the flow pattern that develops in the presence of floor and wall interactions in hovering or slow flight includes a large-diameter vortex ring trapped underneath the animal; this vortex ring is considered in slow descending flight in the ''vortex ring state''.
A Qualitative Introduction to the Vortex-Ring-State, Autorotation, and Optimal Autorotation
TL;DR: This paper summarizes the results of a brief VRS literature survey, and provides a literature survey relative to single-engine helicopter optimal autorotation, and its associated problem formulation as a nonlinear, constrained, optimal control problem.
Journal ArticleDOI
Prediction of Vortex Ring State Boundary of a Helicopter in Descending Flight by Simulation
A review of rotorcraft wake modeling methods for flight dynamics applications
TL;DR: In this article, the results of a brief survey in the field of rotorcraft inflow and wake modeling developments are presented for many years, inflow models have been augmented with (semi-) empirical and analytical models to remove restrictions present in dynamic inflow model.
Computational aerodynamics of hovering helicopter rotors
TL;DR: In this paper, the authors discuss the prediction of rotor hover performance, wake geometry and its strength using CFD methods and compare the predicted data with available experimental data and the results indicate that, blade loading and wake geometry are in excellent agreement with experiments and have moderate sensitivity to the grid resolution.
References
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Book
Aerodynamics of the Helicopter
Alfred Gessow,Garry C Myers +1 more
TL;DR: Aerodynamics of the helicopter as discussed by the authors, a.k.a., the helicopter's engine, is a type of helicopter that is used for aerial photography. ǫ.
Journal ArticleDOI
Experiments on a model helicopter rotor operating in the vortex ringstate.
TL;DR: In this paper, a model helicopter rotor operating in the vortex ring state has been experimentally investigated and the time histories of thrust, torque, and rpm of the rotor were measured by use of sensing devices that were installed on the shaft of the helicopter.
Empirical Relation Between Induced Velocity, Thrust, and Rate of Descent of a Helicopter Rotor as Determined by Wind-tunnel Tests on Four Model Rotors
Walter Castles,Robin B. Gray +1 more
TL;DR: The empirical relation between the induced velocity, thrust and rate of vertical descent of a helicopter rotor was calculated from wind tunnel force tests on four model rotors by the application of blade-element theory to the measured values of the thrust, torque, blade angle, and equivalent free-stream rate of descent as mentioned in this paper.
Related Papers (5)
Empirical Relation Between Induced Velocity, Thrust, and Rate of Descent of a Helicopter Rotor as Determined by Wind-tunnel Tests on Four Model Rotors
Walter Castles,Robin B. Gray +1 more