scholarly journals Performance and Vibratory Loads Data from a Wind-Tunnel Test of a Model Helicopter Main-Rotor Blade with a Paddle-Type Tip

1997 ◽  
Author(s):  
William T. Yeager ◽  
Noonan Jr. ◽  
Singleton Kevin W. ◽  
Wilbur Jeffrey D. ◽  
Matthew L.
Keyword(s):  
Wind Tunnel ◽  
Rotor Blade ◽  
Wind Tunnel Test ◽  
Main Rotor ◽  
Model Helicopter ◽  
Helicopter Main Rotor ◽  
Main Rotor Blade

Helicopter Main Rotor Blade Root End under High Velocity Bird Impact

2018 ◽  
Vol 5 (2) ◽  
pp. 4653-4668 ◽  
Author(s):  
D Chandra Naik ◽  
R Vijaya Kumar
Keyword(s):  
High Velocity ◽  
Rotor Blade ◽  
Main Rotor ◽  
Blade Root ◽  
Bird Impact ◽  
Helicopter Main Rotor ◽  
Main Rotor Blade

A Case Study on the Air Flow Characteristics of the Hirobo-FALCON 505 Controllable Helicopter's Main Rotor Blade

2014 ◽  
Vol 527 ◽  
pp. 39-42 ◽  
Author(s):  
Ziad Bin Abdul Awal ◽  
Mohd Shariff bin Ammoo
Keyword(s):  
Flow Visualization ◽  
Rotor Blade ◽  
Flow Characteristics ◽  
Main Rotor ◽  
Through Flow ◽  
Visualization Process ◽  
High Kinetic Energy ◽  
Blade Tip ◽  
Helicopter Main Rotor ◽  
Main Rotor Blade

The aerodynamics of the helicopter rotor is one of the most elating and exigent tribulations faced by the aerodynamicists today. Study through flow visualization process plays a key role in understanding the airflow distinctiveness and vortex interaction of the helicopter main rotor blade. Inspecting and scrutinizing the effects of wake vortices during operation is a great challenge and imperative in designing effective rotor system. This study aimed to visualize the main rotor airflow pattern of the Hirobo-FALCON 505 controllable subscale helicopter and seek for the vortex flow at the blade tip. The experimental qualitative data is correlated with quantitative data to perform scrupulous study on the airflow behavior and characteristics along with its distinctiveness spawned by the main rotor blade. Simulation using design software is performed in analogous stipulations to endow with comparability between the flow visualization results. Throughout the blade span several dissimilar flow patterns have been identified. The main rotor hub has turbulent flow at its center due to low energy of air amassed in this region whereas in the middle portion of the rotor blade, the air encompasses high kinetic energy with a clear straight streamline pattern.

scholarly journals АНАЛІЗ КОНСТРУКТИВНО-ТЕХНОЛОГІЧНИХ ОСОБЛИВОСТЕЙ ЛОПАТЕЙ НЕСУЧИХ ГВИНТІВ ВАЖКИХ ТРАНСПОРТНИХ ВЕРТОЛЬОТІВ

2021 ◽  
pp. 59-103
Author(s):  
А. Г. Гребеников ◽  
Ю. В. Дьяченко ◽  
В. В. Коллеров ◽  
В. Ю. Коцюба ◽  
И. В. Малков ◽  
...  
Keyword(s):  
Service Life ◽  
Rotor Blade ◽  
Parametric Modeling ◽  
Rotor Blades ◽  
Parametric Models ◽  
Space Distribution ◽  
Main Rotor ◽  
Mixed Design ◽  
Helicopter Main Rotor ◽  
Main Rotor Blade

The analysis of the design and technological features of the rotor blades of heavy transport helicopters is carried out. The main performance characteristics of heavy helicopters are presented. General requirements to helicopter main rotor blades design and specifications for their production are formulated. The design and force diagram of heavy helicopter main rotor blades is considered. The features of structural materials for the main rotor blades of heavy transport helicopters are marked. The main rotor blades differ in their design due to different approaches to materials, manufacturing and layout of blade elements. The main rotor blades of an all-metal design, for design and technological reasons, are divided into two groups: a frame structure with a tubular steel spar and an aluminum extruded spar. As a result of a number of design and technological measures the service life of the main rotor blade of helicopter Mi-6 was brought from 50 hours to 1500 hours. The principal peculiarity of the steel tubular spar of the main rotor blade of the Mi-26 helicopter is the absence of the shaft lug. The features of mixed design main rotor blades are presented. The method of parametric modeling of helicopter main rotor blades is presented. The application of the three-dimensional parametric models of structural elements in practice of designing and construction enables to perform numerical calculations of aerodynamic and strength characteristics both of separate aggregates, units and details and of the helicopter as a whole by means of the finite element method. The method of parametric modeling of the main rotor blade of the transport helicopter with the computer system CATIA V5 is a modification of the method of integrated designing of the elements of aviation constructions. Parametric master geometry of the main rotor blade is a linear surface, created by basic profiles of the blade. On the basis of parametric master geometry a space distribution model is created that determines the position of axial planes of the power set of the blade for further creation of the blade detail models. Technological flowchart of main rotor blade manufacturing is presented, manufacturing and surface hardening technology of steel tubular spar is considered. The technology of manufacturing and molding the nose part of the blade of the main rotor mixed design. The technological features of slipway assembly-gluing of the main rotor blade are considered, the content of off-slipway work is given.These materials can be useful in theoretical and experimental studies to extend the service life of the rotor blades of Mi-26 helicopters, which are currently in operation in Ukraine.

scholarly journals Vibration-based damage detection for a composite helicopter main rotor blade

2016 ◽  
Vol 3 ◽  
pp. 22-27 ◽  
Author(s):  
F.L.M. dos Santos ◽  
B. Peeters ◽  
H. Van der Auweraer ◽  
L.C.S. Góes ◽  
W. Desmet
Keyword(s):  
Damage Detection ◽  
Rotor Blade ◽  
Main Rotor ◽  
Helicopter Main Rotor ◽  
Main Rotor Blade

scholarly journals Helicopter main rotor blade injury to the head with survival

1997 ◽  
Vol 143 (2) ◽  
pp. 122-123 ◽  
Author(s):  
J. Gibbons ◽  
L. Orr ◽  
D. Carr ◽  
C. Gibbons
Keyword(s):  
Rotor Blade ◽  
Main Rotor ◽  
Helicopter Main Rotor ◽  
Main Rotor Blade
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