|
|
|
|
|
Xinfan Yin, Hongxu Ma, Xianmin Peng, Guichuan Zhang, Honglei An and Liangquan Wang
In order to simulate the flight state of the helicopter effectively, it is necessary to trim the helicopter during the forward flight in a wind tunnel test. Previously, due to the lack of an internal-control closed loop in the test rig, the helicopter-wi...
ver más
|
|
|
|
|
|
|
|
|
|
|
Mircea-Bogdan Radac and Timotei Lala
This work suggests a solution for the output reference model (ORM) tracking control problem, based on approximate dynamic programming. General nonlinear systems are included in a control system (CS) and subjected to state feedback. By linear ORM selectio...
ver más
|
|
|
|
|
|
|
|
|
|
|
Jian He, Xiang Luo, Yang Bai, An Song and Tao Yang
In aero-engines, a secondary air system is used to cool the rotor discs and seal cavities between rotor and stator parts. The pressure loss caused by bleed air can be effectively reduced by setting the finned vortex reducer. Thus, the bleed system design...
ver más
|
|
|
|
|
|
|
|
|
|
|
Chunhua Wei, Chenglin Zuo, Xianhui Liao, Guoshuai Li, Lingrui Jiao, Di Peng and Lei Liang
A simultaneous surface pressure and displacement measurement method that integrates pressure-sensitive paint (PSP) and binocular stereophotogrammetry is proposed. The assays were completed on the F4 m rotor test stand at China Aerodynamic Research and De...
ver más
|
|
|
|
|
|
|
|
|
|
|
Yun Jiang, Bo Zhang and Tao Huang
The present study aimed at assessing a novel annular-ducted fan lift system for VTOL aircraft through computational fluid dynamics (CFD) simulations. The power and lift efficiency of the lift fan system in hover mode, the lift and drag in transition mode...
ver más
|
|
|
|
|
|
|
|
|
|
|
Morgan Rossander, Eduard Dyachuk, Senad Apelfröjd, Kristian Trolin, Anders Goude, Hans Bernhoff and Sandra Eriksson
Unique blade force measurements on an open site straight-bladed vertical axis wind turbine have been performed. This paper presents a method for measuring the tangential and normal forces on a 12-kW vertical axis wind turbine prototype with a three-blade...
ver más
|
|
|
|
|
|
|
|
|
|
|
Alessandro Corsini, Sara Feudo, Cecilia Tortora, Graziano Ullucci
Pág. 153 - 163
This work investigates the use of unconventional sensors to measure pressure modulation interpreted as pseudo sound in the near field on the casing of a fan in a view to detect rotating stall. Rotating stall is an aerodynamic issue with a frequency signa...
ver más
|
|
|
|
|
|
|
|
|
|
|
Valerie Hernley, Aleksandar Jemcov, Jeongseek Kang, Matthew Montgomery and Scott C. Morris
The relationship between aerodynamic forcing and non-synchronous vibration (NSV) in axial compressors remains difficult to ascertain from experimental measurements. In this work, the relationship between casing pressure and blade vibration was investigat...
ver más
|
|
|
|
|
|
|
|
|
|
|
Mohamad Hmedi, Emre Uzunoglu, Antonio Medina-Manuel, Jordi Mas-Soler, Felipe Vittori, Oscar Pires, José Azcona, Antonio Souto-Iglesias and C. Guedes Soares
This work evaluates the experimental test results regarding the operational performance of a free-float capable tension leg platform with a 10 MW wind turbine. It covers the platform dynamics in the selected installation area: Ribadeo, Spain. The model a...
ver más
|
|
|
|
|
|
|
|
|
|
|
Chang Wang, Minqi Huang, Xianmin Peng, Guichuan Zhang, Min Tang and Haowen Wang
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 advanc...
ver más
|
|
|
|
|
|
|
|
|
|
|
Zhenyu Wang, Quinten Henricks, Mei Zhuang, Anshuman Pandey, Mark Sutkowy, Braxton Harter, Matthew McCrink and James Gregory
With the rapid increase in the number of multi-rotor small unmanned aerial systems (sUAS) in recent years and a plethora of possible applications, the aerodynamic and aeroacoustic characteristics of these vehicles become very important issues. Due to the...
ver más
|
|
|
|
|
|
|
|
|
|
|
Wei Yu, Ming Ming Zhang and Jian Zhong Xu
This paper presents a newly developed aero-servo-elastic platform for implementing smart rotor control and shows its effectiveness with aerodynamic loads on large-scale offshore wind turbines. The platform was built by improving the FAST/Aerodyn codes wi...
ver más
|
|
|
|
|
|
|
|
|
|
|
Changwu Liang, Hong Li, Taoyong Su, Caleb Alistair Frank and Kewei Li
An electrically controlled rotor (ECR), also known as a swashplateless rotor, eliminates the swashplate system to implement the primary control via the trailing-edge flaps (TEFs), which can result in enhancements in rotor performance, as well as substant...
ver más
|
|
|
|
|
|
|
|
|
|
|
Lingzhi Wang and Taoyong Su
An electrically controlled rotor (ECR) is a kind of swashplateless rotor that implements the primary control via the trailing-edge flap system instead of a swashplate and demonstrates great potential in vibration reduction and noise alleviation. In this ...
ver más
|
|
|
|
|
|
|
|
|
|
|
Filippo Merli, Nicolas Krajnc, Asim Hafizovic, Marios Patinios and Emil Göttlich
The purpose of the paper is to characterize the aerodynamic behavior of a rotor-downstream hub cavity rim seal in a high-pressure turbine (HPT) stage. The experimental data are acquired in the Transonic Test Turbine Facility at the Graz University of Tec...
ver más
|
|
|
|
|
|
|
|
|
|
|
Xi Chen, Yan Ding, Guoqing Zhao and Qijun Zhao
To study the effects of synthetic jet control on the aerodynamic performance of a rotor in forward flight, we conducted a series of experiments with varying rotor rotation speeds and free stream velocities. In the test, we used a six-component balance an...
ver más
|
|
|
|
|
|
|
|
|
|
|
Linghua Dong and Qiyu Li
Whirl flutter of a tiltrotor aircraft is a complex aeroelastic phenomenon and it can result in catastrophic consequences. The deflection of an aileron mounted on a wing has the potential to solve this fatal problem. Whirl flutter suppression using an act...
ver más
|
|
|
|
|
|
|
|
|
|
|
Qiuwan Du and Di Zhang
The leakage problem of supercritical carbon dioxide (SCO2) axial-inflow turbine brings great challenges to the efficiency and security of the power system. Labyrinth seals are usually utilized to improve the leakage characteristics of the blade tip. In t...
ver más
|
|
|
|
|
|
|
|
|
|
|
Katrina Calautit, Angelo Aquino, John Kaiser Calautit, Payam Nejat, Fatemeh Jomehzadeh and Ben Richard Hughes
Global demand for energy continues to increase rapidly, due to economic and population growth, especially for increasing market economies. These lead to challenges and worries about energy security that can increase as more users need more energy resourc...
ver más
|
|
|
|
|
|
|
|
|
|
|
Bence Tóth, János Vad
Pág. 152 - 158
Axial fans operate in large numbers, often in the close vicinity of humans, therefore reducing their noise is a primary concern. In this paper, beamforming is applied to get information about the location and strength of noise sources on the rotor. This ...
ver más
|
|
|
|
|
|