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Xiaotian Niu and Jie Li
Reducing drag is critical to aircraft design. In recent years, laminar technology has become one of the most important feasible technologies for civil aircraft drag reduction design under many design constraints. However, various factors have a certain i...
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Jang-oh Mo and Beom-seok Rho
Understanding the characteristics and effects of the laminar separation bubbles (LSBs) is important in the aerodynamic design of wind turbine airfoils for maximizing wind turbine efficiency. In the present study, numerical simulations using the ;...
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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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Marius Mihai Cazacu, Alin Iulian Ro?u, Razvan Vasile Ababei, Adrian Ro?u, Decebal Vasincu, Drago? Constantin Nica, Oana Rusu, Andreea Bianca Bruma and Maricel Agop
This paper investigates the nonlinear dynamics of atmospheric aerosols during the transition from laminar to turbulent flows using the framework of Scale Relativity Theory. It is proposed that the transition from multifractal to non-multifractal scales (...
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Freddy Caro and Marc G. Carmichael
Laminar jamming (LJ) is a method to achieve variable stiffness in robotics that has attracted notable attention because of its simple working principle and potential high stiffness variation. This article reviews the lock/unlock mechanisms of LJ structur...
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Yong Wang, Kongcheng Zuo, Peng Guo, Kun Zhao and Victor Feliksovich Kopiev
Reducing the tonal noise from airfoil instabilities has attracted significant interest from the aeronautical community in the past few years. The aim of this paper is to investigate the effect of structured porous trailing edges on the tonal noise reduct...
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Matteo Dellacasagrande, Davide Lengani, Daniele Simoni and Marina Ubaldi
The bursting phenomenon consists in the switch of a laminar separation bubble from a short to a long configuration. In the former case, reduced effects on profile pressure distribution are typically observed with respect to the attached condition. On the...
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Zhiyong Liu, Hongbiao Wang, Zhao Zhang, Xiang Liu and Fengxue Qian
The transition characteristics of a modified RAE5243 airfoil were investigated using a wind tunnel test and numerical simulations. Transition detection is of great significance for the assessment of drag reduction. In wind tunnel tests, transition locati...
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Pedro Leite Ferreira and Dídia Isabel Cameira Covas
The current paper aims at assessing the effect of the radial mesh on the description of the axial velocity in steady-state and transient conditions and at presenting the results of a new optimized equal-area mesh. For this purpose, a quasi-2D model is im...
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Amir Abdullaev, Alexander Kotvitskii, Ivan Moralev and Maxim Ustinov
Cancellation of the cross-flow vortices in a swept-wing boundary layer is attempted by plasma actuator array in numerical simulation. The response of the boundary layer to the stationary excitation by a single actuator section is measured experimentally ...
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Lennart Lobitz, Hendrik Traub, Mats Overbeck, Maximilian Bien, Sebastian Heimbs, Christian Hühne, Jens Friedrichs and Peter Horst
Laminar flow offers significant potential for increasing the energy-efficiency of future transport aircraft. The German Cluster of Excellence SE2A is developing a new approach for hybrid laminar flow control. The concept aims to maintain laminar flow up ...
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Yuanqiang Liu, Yan Liu, Zubi Ji, Yutian Wang and Jiakuan Xu
Surface suction provides an efficient way to delay boundary layer transitions. In order to verify the suction effects and determine the mechanism of suction control in transonic swept wing boundary layers, wind tunnel transition measurements in a hybrid ...
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Milad Mohammadi and Mohammad Sadegh Abedinejad
A comprehensive investigation of turbulent combustion is accomplished to study the relationship between nitrogen oxide (NO) formation and entropy generation distribution in a non-premixed propane combustion. The radiation heat transfer and combustion are...
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Hongxin Wang, Degang Xu, Linwen Li, Kaiwen Zhou, Xin Wen and Hui Tang
This paper aims to further the understanding of the mixing process of in-line twin synthetic jets (SJs) and their impact in the near-wall region in a flat-plate laminar boundary layer. A numerical study has been carried out, in which colored fluid partic...
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Mariana Montenegro-Montero, Gustavo Richmond-Navarro
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Wenkai Yang, Ashraf N. Al Khateeb and Dimitrios C. Kyritsis
The impact of adding H2O2 in the fuel stream on the structure of non-premixed opposed-flow NH3/O2 flames was investigated numerically using a verified computational tool and validated mechanism. The results illustrate the dual role of the added H2O2 with...
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Jian Liu, Dingrui Zhang, Lingyun Hou, Jinhu Yang and Gang Xu
Aero-engine combustors may experience extreme low pressures in the case of an in-flight shutdown, which makes the study of aviation kerosene flame propagation characteristics at low pressures important. The present work examined flame propagation during ...
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Minh Tien Nguyen, Van Van Luong, Quoc Thai Pham, Minh Tung Phung and Phu Nguu Do
A series of experiments were performed to investigate the effect of ignition energy (Eig) and hydrogen addition on the laminar burning velocity (Su0), ignition delay time (tdelay), and flame rising time (trising) of lean methane-air mixtures. The mixture...
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Andriy Semenov, Volodymyr Drevetskyi, Andrii Rudyk, Olena Semenova and Pawel Komada
Measuring the viscosity and density of petroleum products is important for their proper production, transportation and application. Viscosity and density are the main parameters determining the composition and structure of petroleum products. Therefore, ...
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Ettore Bertolini, Paul Pieringer and Wolfgang Sanz
The aim of this work is to study the influence of different subgrid-scale (SGS) closure models and inflow turbulence conditions on the boundary layer transition on the suction side of a highly loaded transonic turbine cascade in the presence of high free...
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