Results 71 to 80 of about 64,082 (287)

HELICOPTER ROTOR DESIGN

Journal of Industrial Design and Engineering Graphics, 2011
The objective of this paper is to analyze the role of helicopter rotor, to classify them by type, and to imagine new types of helicopter rotors that can equip future helicopters.
IONESCU Cristian Andrei
doaj  

A Straight-bladed Vertical Axis Wind Turbine with a Directed Guide Vane Row

Journal of Fluid Science and Technology, 2008
A straight-bladed vertical axis wind turbine with a directed guide vane row has been proposed in order to enhance its torque. The experimental study of the proposed wind turbine was carried out by a wind tunnel with an outlet diameter of 1.8m. The tested
Manabu TAKAO, Takao MAEDA, Yasunari KAMADA, Michiaki OKI, Hideki KUMA   +4 more
doaj   +1 more source

Experimental study of main rotor tip geometry and tail rotor interactions in hover. Volume 1. Text and figures [PDF]

A model scale hover test was conducted in the Sikorsky Aircraft Model rotor hover Facility to identify and quantify the impact of the tail rotor on the demonstrated advantages of advanced geometry tip configurations.
Balch, D. T., Lombardi, J.
core   +1 more source

Unsteady Flow Behavior and Radial Force Analysis of a Side Channel Pump Under Different Blade Tip Cutting Angles Using Computational Fluid Dynamics

Energy Science &Engineering, EarlyView.
The Radial Force (RF) distribution under different cutting angles is presented in Figure 1. Generally, the distribution of RF displays divergence across different flow conditions. The pattern of force distribution reveals a total of 24 peaks, which corresponds to the number of blades of the impeller of the SCP.
Kofi Asamoah Adu‐Poku, Desmond Appiah, Fan Zhang, Chen Ke   +3 more
wiley   +1 more source

Research investigation of helicopter main rotor/tail rotor interaction noise [PDF]

Acoustic measurements were obtained in a Langley 14 x 22 foot Subsonic Wind Tunnel to study the aeroacoustic interaction of 1/5th scale main rotor, tail rotor, and fuselage models.
Fitzgerald, J., Kohlhepp, F.
core   +1 more source

Separation of Main and Tail Rotor Noise Sources from Ground-Based Acoustic Measurements Using Time-Domain De-Dopplerization [PDF]

, 2009
A new method of separating the contributions of helicopter main and tail rotor noise sources is presented, making use of ground-based acoustic measurements.
Greenwood, Eric II, Schmitz, Fredric H.
core   +1 more source

Antibacterial Hydrogel Dressing With Ca2+‐Dependent Hyaluronidase Responsiveness for Accelerating Wound Healing via On‐Demand Release of AIE Photosensitizers

Exploration, EarlyView.
This study innovates a Ca2+‐responsive hydrogel dressing that releases AIE photosensitizers on‐demand. Low Ca2+ enhances bacterial hyaluronidase (HAase) activity, degrading hyaluronic acid dressing to trigger antibacterial ROS release, while high Ca2+ inhibits HAase, preventing overdosing.
Rongwei Cui, Hao Yang, Miaomiao Kang, Zhijun Zhang, Weilin Xu, Yang Jiang, Lizhou Xu, Xiao‐Yong Zhan, Luhan Zhang, Yunsheng Xu, Dong Wang, Ben Zhong Tang, Danyang Li   +12 more
wiley   +1 more source

Aerodynamic characteristics of a 1/6-scale model of the rotor systems research aircraft with the rotors removed [PDF]

A wind-tunnel investigation was conducted to refine the aerodynamic characteristics of the rotor systems research aircraft. For the investigation, a 1/6-scale model without a main rotor or a tail rotor was used.
Freeman, C. R., Hassell, J. L., Jr., Mineck, R. E.   +2 more
core   +1 more source

Discovery and validation of a urinary extracellular vesicle protein signature for the diagnosis of renal allograft fibrosis

Interdisciplinary Medicine, EarlyView.
Discovery and validation of a urinary extracellular vesicle protein signature for the diagnosis of renal allograft fibrosis. Abstract Interstitial fibrosis is the best indicator of irreversible or ongoing renal injury after kidney transplantation and faces considerable diagnostic challenges.
Wenxuan Zhao, Yang Xu, Yuewen Wang, Shihao Jin, Wenhui Wang, Zeming Yu, Yanwen Zhang, Yuxin Zhang, Deling Kong, Bing Wang, Zhenzhou Wu, Jie Zhao, Yuebing Wang   +12 more
wiley   +1 more source

Green Maintenance Technology for Large Area Damage of Composite Tail Rotor Blade

Engineering Proceedings
Based on the analysis of the damage location, damage size, product layering structure, and internal filling structure of the composite tail rotor blade, the damage maintenance technical scheme was initially determined.
Miao Ren, Qidi Liu, Nan Lv, Lili Li
doaj   +1 more source