Results 231 to 240 of about 72,003 (271)

The effects of leading-edge tubercles on dynamic stall

Journal of Fluid Mechanics, 2020
The effects of leading-edge tubercles, based on the flippers of humpback whales, on the flow field around an airfoil undergoing large-amplitude dynamic changes in the angle of attack have been studied experimentally. Airfoils were pitched from an initial
J. Hrynuk, D. Bohl
semanticscholar   +1 more source

Variation of leading-edge suction during stall for unsteady aerofoil motions

Journal of Fluid Mechanics, 2020
The suction force at the leading edge of a round-nosed aerofoil is an important indicator of the state of the flow over the leading edge and, often, the entire aerofoil. The leading-edge suction parameter (LESP) is a non-dimensional version of this force.
S. Narsipur, Pranav Hosangadi, Ashok Gopalarathnam, J. Edwards   +3 more
semanticscholar   +1 more source

Transient dynamics of stall and reattachment at low Reynolds number

Journal of Fluid Mechanics
Wind tunnel experiments are performed to investigate stall and reattachment transients for an aerofoil and wing model at low chord Reynolds numbers ( $8\times 10^4\leqslant {{Re}}_c\leqslant 1\times 10^5$ ) where a laminar separation bubble (LSB) may ...
Connor E. Toppings, S. Yarusevych
semanticscholar   +1 more source

Discrete vortex-based broadcast mode analysis for mitigation of dynamic stall

Journal of Fluid Mechanics
We integrate a discrete vortex method (DVM) with complex network analysis to strategise dynamic stall mitigation over aerofoils with active flow control.
H. D. Patel, Y. Lee, Ashok Gopalarathnam, Chi-An Yeh   +3 more
semanticscholar   +1 more source

Dynamic stall of a hydrofoil with tubercles in surface gravity waves

Journal of Fluid Mechanics
The interaction of an object with an unsteady flow is non-trivial and is still far from being fully understood. When an aerofoil or hydrofoil, for example, undergoes time-dependent motion, nonlinear flow phenomena such as dynamic stall can emerge.
Guillaume Ricard, Gunnar Jacobi, Daniele Fiscaletti, A-J. Buchner   +3 more
semanticscholar   +1 more source

A point vortex model for spike-type instability leading to rotating stall

Journal of Fluid Mechanics
For decades, it has been established that there are two distinct types of instability waves leading to rotating stall in compressors, known as modes and spikes.
Xiaodong Jing
semanticscholar   +1 more source

Linear stability analysis of turbulent mean flows based on a data-consistent Reynolds-averaged Navier–Stokes model: prediction of three-dimensional stall cells around an airfoil

Journal of Fluid Mechanics
Stall cells are transverse cellular patterns that often appear on the suction side of airfoils near stalling conditions. Wind-tunnel experiments on a NACA4412 airfoil at Reynolds number ${Re}=3.5 \times 10^5$ show that they appear for angles of attack ...
K. Sarras, C. Tayeh, V. Mons, O. Marquet
semanticscholar   +1 more source

Three-dimensional computational fluid dynamic analysis of a large-scale vertical axis wind turbine

Journal of Aerospace Engineering and Mechanics, 2021
The vertical axis wind turbine (VAWT) configuration has many advantages for an offshore wind turbine Installation. In this paper, the three dimensional (3D) computational fluid dynamics analysis of a large-scale 5 MW VAWT is conducted. At the optimum tip-
Brian Hand
semanticscholar   +1 more source

Passive Suppression of Diffuser Rotating Stall in a Centrifugal Pump by the Non-Symmetry Diffuser Vane

Volume 1: Fluid Applications and Systems (FASTC); Fluid Measurement and Instrumentation (FMITC); Fluid Mechanics (FMTC); Multiphase Flow (MFTC)
Diffuser Rotating Stall (DRS), a fluid instability, often restricts the operational range of diffuser-type centrifugal pumps, requiring countermeasures in industry.
Mikio Takahashi, Dai Iwasaki, Shinichi Konno, Shinichiro Ejiri, Masahiro Miyabe   +4 more
semanticscholar   +1 more source

Optimization of NACA 0012 Airfoil Performance in Dynamics Stall Using Continuous Suction Jet

Volume 2: Fluid Mechanics; Multiphase Flows, 2020
Many different active flow control methods are used to manipulate the flow field about aerodynamic surfaces in order to obtain the most desirable aerodynamic performance.
M. Tadjfar, Siroos Kasmaiee, S. Noori
semanticscholar   +1 more source