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Constantinos F. Panagiotou, Fotos S. Stylianou, Elias Gravanis, Evangelos Akylas and Constantine Michailides
In this paper, we propose an algebraic model for turbulent scalar-flux vector that stems from tensor representation theory. The resulting closure contains direct dependence on mean velocity gradients and quadratic products of the Reynolds stress tensor. ...
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Julia Kurz, Martin Hoeger and Reinhard Niehuis
A highly loaded turbine exit guide vane with active boundary layer control was investigated experimentally in the High Speed Cascade Wind Tunnel at the University of the German Federal Armed Forces, Munich. The experiments include profile Mach number dis...
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Abel Arredondo-Galeana, Aristides Kiprakis and Ignazio Maria Viola
Active surface morphing is a nonintrusive flow control technique that can delay separation in laminar and turbulent boundary layers. Most of the experimental studies of such control strategy have been carried out in wind tunnels at low Reynolds numbers w...
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Tilman Raphael Schröder, Sebastian Schuster and Dieter Brillert
The designers of radial turbomachinery need detailed information on the impact of the side chamber flow on axial thrust and torque. A previous paper investigated centripetal flow through narrow rotor?stator cavities and compared axial thrust, rotor torqu...
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Florent Ravelet, Amélie Danlos, Farid Bakir, Kilian Croci, Sofiane Khelladi and Christophe Sarraf
The present study focuses on the inception, the growth, and the potential unsteady dynamics of attached vapor cavities into laminar separation bubbles. A viscous silicon oil has been used in a Venturi geometry to explore the flow for Reynolds numbers ran...
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Richard Hann, R. Jason Hearst, Lars Roar Sætran and Tania Bracchi
Most icing research focuses on the high Reynolds number regime and manned aviation. Information on icing at low Reynolds numbers, as it is encountered by wind turbines and unmanned aerial vehicles, is less available, and few experimental datasets exist t...
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Lance W. Traub and Mashaan P. Kaula
One of the most commonly implemented devices for stall control on wings and airfoils is a leading-edge slat. While functioning of slats at high Reynolds number is well documented, this is not the case at the low Reynolds numbers common for small unmanned...
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Lance W. Traub and Mashaan P. Kaula
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Phillip Burgers
The capability of flapping wings to generate lift is currently evaluated by using the lift coefficient ??????????
C
¯
L
, a dimensionless number that is derived from the basal equation that calculates the steady-state lift coefficient CL for fixed wings....
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Lu Yang and Guangming Zhang
Currently, influence analysis of simulation parameters, especially the trailing edge shape and the corresponding modeling method on the force coefficients of NACA0012 under a high Reynolds number, is relatively sparse. In this paper, two trailing edge sh...
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Ville Viitanen, Timo Siikonen and Antonio Sánchez-Caja
In this paper, we conducted numerical simulations to investigate single and two-phase flows around marine propellers in open-water conditions at different Reynolds number regimes. The simulations were carried out using a homogeneous compressible two-phas...
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Arslan Saleem and Man-Hoe Kim
The air-side thermal-hydraulic performance of multi-louvered aluminium fin heat exchangers is investigated. A systematic numerical study has been performed to analyze the air-sde thermal hydraulic characteristics over a wide range of Reynolds number i.e....
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Loris Simonassi, Gustavo Lopes and Sergio Lavagnoli
The influence of unsteady wakes incoming from the upstream stages is of high relevance in modern high-speed, low-pressure turbines (LPT) operating at transonic exit Mach numbers and low Reynolds numbers for their potential to trigger transition and influ...
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Lei Xi, Jianmin Gao, Liang Xu, Zhen Zhao, Qicheng Ruan and Yunlong Li
In this study, numerical simulations were carried out to investigate the flow and heat transfer characteristics of jet array impingement cooling in the quasi-leading-edge channel of gas turbine blades. The influence laws of Reynolds number (Re, 10,000 to...
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Yuanjing Wang, Dawei Liu, Xin Xu and Guoshuai Li
The scale difference between the real flight vehicle and the experimental model results in the Reynolds number effect, which makes it unreliable to predict the aerodynamic characteristics of flight vehicles by wind tunnel testing. To understand the mecha...
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Andreas Gross and Hermann F. Fasel
When a laminar boundary layer is subjected to an adverse pressure gradient, laminar separation bubbles can occur. At low Reynolds numbers, the bubble size can be substantial, and the aerodynamic performance can be reduced considerably. At higher Reynolds...
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K. R. Gawande,A. V. Deshmukh
Pág. 105 - 112
An experimental investigation was carried for measuring tube-side heat transfer coefficient, friction factor, heat transfer enhancement efficiency of water for turbulent flow in a circular tube fitted with rectangular-cut twisted tape insert. A copper tu...
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Lei Xi, Jianmin Gao, Liang Xu, Zhen Zhao, Zhengheng Yang and Yunlong Li
In this study, different layout schemes for an X-shaped truss array channel are designed to explore the application of an X-shaped truss array structure in the mid-chord region of turbine blades. The flow and heat transfer performance of X-shaped truss a...
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Andrzej Mrowiec
This article contains the results of experimental studies of a multi-opening orifice with substitute constriction factor of ß = 0.5 (m = 0.25), mounted in a DN50 hydraulic measuring flume. Flow measurements were taken from a progressing turbulent flow wi...
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Julien Clinckemaillie and Tony Arts
This paper aims at evaluating the characteristics of the wakes periodically shed by the rotating bars of a spoked-wheel type wake generator installed upstream of a high-speed low Reynolds linear low-pressure turbine blade cascade. Due to the very high ba...
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