Results 1 to 10 of about 4,234 (146)
Wind Tunnel Studies on Hover and Forward Flight Performances of a Coaxial Rigid Rotor [PDF]
Aerospace, 2021 The aerodynamic performance of a reduced-scale coaxial rigid rotor system in hover and steady forward flights was experimentally investigated to gain insights into the effect of interference between upper and lower rotors and the influences of the ...
Chang Wang +5 more
doaj +4 more sources
Rotor Performance Predictions for Urban Air Mobility: Single vs. Coaxial Rigid Rotors
AerospaceThis work details the development and validation of a methodology for high-resolution rotor models used in hybrid Blade Element Momentum Theory Unsteady Reynolds Averaged Navier–Stokes (BEMT-URANS) CFD.
Jason Cornelius +4 more
doaj +4 more sources
Geometry Design of Coaxial Rigid Rotor in High-Speed Forward Flight [PDF]
International Journal of Aerospace Engineering, 2020 The aerodynamic performance analysis and blade planform design of a coaxial rigid rotor in forward flight were carried out utilizing CFD solver CLORNS. Firstly, the forward flow field characteristics of the coaxial rotor were analyzed.
Bo Wang +3 more
doaj +2 more sources
Vibration loads analysis of coaxial rigid rotor in rotor interaction
Xibei Gongye Daxue Xuebao, 2021 A vibration load computing method for a coaxial rigid rotor was developed and applied to analyzing its vibration load in rotor interference. The structural dynamics model based on the medium-size deformation beam theory and the double-rotor aerodynamics ...
Yu Zhihao +3 more
doaj +2 more sources
Aerospace, 2023 This study develops a hybrid solver with reversed overset assembly technology (ROAT), a viscous vortex particle method (VVPM), and a CFD program based on the URNS method, in order to study the aerodynamic and acoustic characteristics of coaxial rigid ...
Yucheng Yang +3 more
doaj +2 more sources
Effect of Blade Tip Configurations on the Performance and Vibration of a Lift-Offset Coaxial Rotor
Aerospace, 2023 This present study investigates the effect of blade tip configurations, such as the sweepback angle and anhedral angle, on the performance and hub vibratory loads for the lift-offset coaxial rotor of a 30,000-pound-class high-speed long-range utility ...
Yu-Been Lee, Jae-Sang Park
doaj +3 more sources
Trim investigation for coaxial rigid rotor helicopters using an improved aerodynamic interference model [PDF]
Aerospace Science and Technology, 2019 The coaxial rigid rotor helicopter has been proposed as a future high-performance rotorcraft concept. However, the aerodynamic interference of this helicopter is complicated because it couples with the unique flapping feature of the rigid rotor, which further alters the trim characteristics of coaxial rigid rotor helicopters. Thus, a multi-point vortex
Ye Yuan, Renliang Chen
exaly +4 more sources
Aerodynamic characteristics of rigid coaxial rotor by wind tunnel test and numerical calculation
Chinese Journal of Aeronautics, 2019 Abstract Focusing on aerodynamic characteristics of rigid coaxial rotor of a high-speed helicopter in hover and forward flight, a wind tunnel test is conducted in the 8 m × 6 m low-speed straight-flow wind tunnel of China Aerodynamics Research and Development Center.
Jinghui DENG +4 more
exaly +2 more sources
Design of a control system for a 1.5 m diameter coaxial rigid rotor model
Hangkong gongcheng jinzhanAs a key equipment for rotor wind tunnel testing, the design specifications and control accuracy of the rotor test bench directly determine the testing accuracy and effectiveness of the rotor wind tunnel testing.
LIU Shi, SHAO Tianshuang, LIU Xiangnan
doaj +2 more sources
International Journal of Aeronautical and Space Sciences, 2019 A computational fluid dynamics method is built to study the unsteady aerodynamic loads of a high-speed rigid coaxial rotor model, taking account of lift offset (LOS). The flowfield is simulated by solving Reynolds Averaged Navier–Stokes equations, and moving overset mesh is adopted to include blade motions. A high-efficient trim model for coaxial rotor
Haotian Qi, Guohua Xu
exaly +2 more sources