Relaminarization by Steady Modification of the Streamwise Velocity Profile in a Pipe [0.03%]
通过稳态修改管内流速剖面实现流动重展式转换
J Kühnen,D Scarselli,M Schaner et al.
J Kühnen et al.
We show that a rather simple, steady modification of the streamwise velocity profile in a pipe can lead to a complete collapse of turbulence and the flow fully relaminarizes. Two different devices, a stationary obstacle (inset) and a device...
Large-Eddy BreakUp Devices - a 40 Years Perspective from a Stockholm Horizon [0.03%]
大型涡破碎装置——来自斯德哥尔摩的四十年回顾与展望
P Henrik Alfredsson,Ramis Örlü
P Henrik Alfredsson
In the beginning of the 1980's Large Eddy BreakUp (LEBU) devices, thin plates or airfoils mounted in the outer part of turbulent boundary layers, were shown to be able to change the turbulent structure and intermittency as well as reduce tu...
Generation Mechanisms of Rotating Stall and Surge in Centrifugal Compressors [0.03%]
离心压缩机旋转失速和旋转喘振的生成机制研究进展
Elias Sundström,Bernhard Semlitsch,Mihai Mihăescu
Elias Sundström
Flow instabilities such as Rotating Stall and Surge limit the operating range of centrifugal compressors at low mass-flow rates. Employing compressible Large Eddy Simulations (LES), their generation mechanisms are exposed. Toward low mass-f...
The Effect of Partial Premixing and Heat Loss on the Reacting Flow Field Prediction of a Swirl Stabilized Gas Turbine Model Combustor [0.03%]
部分预混和热损失对旋流稳定燃气轮机模型燃烧室反应流场预测的影响
Simon Gövert,Daniel Mira,Jim B W Kok et al.
Simon Gövert et al.
This work addresses the prediction of the reacting flow field in a swirl stabilized gas turbine model combustor using large-eddy simulation. The modeling of the combustion chemistry is based on laminar premixed flamelets and the effect of t...
Dispersion of Entropy Perturbations Transporting through an Industrial Gas Turbine Combustor [0.03%]
熵扰动在工业燃气涡轮发动机燃烧室中传输的分散性研究
Yu Xia,Ignacio Duran,Aimee S Morgans et al.
Yu Xia et al.
In the context of combustion noise and combustion instabilities, the transport of entropy perturbations through highly simplified turbulent flows has received much recent attention. This work performs the first systematic study into the tra...
L R Joel Sundstrom,Michel J Cervantes
L R Joel Sundstrom
The near-wall region of an unsteady turbulent pipe flow has been investigated experimentally using hot-film anemometry and two-component particle image velocimetry. The imposed unsteadiness has been pulsating, i.e., when a non-zero mean tur...
A DNS Study of Closure Relations for Convection Flux Term in Transport Equation for Mean Reaction Rate in Turbulent Flow [0.03%]
湍流反应输运方程中平均反应速率闭合关系的DNS研究
A N Lipatnikov,V A Sabelnikov,N Chakraborty et al.
A N Lipatnikov et al.
The present work aims at modeling the entire convection flux ρuW¯ in the transport equation for a mean reaction rate ρW¯ in a turbulent flow, which (equation) was recently put forward by the present authors. In order to ...