Доступ предоставлен для: Guest
Главная ICHMT DL Текущий год Архив Исполнительный Комитет ICHMT

Effects of Periodic Excitation on the Characteristics of a Turbulent Boundary Layer

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.190
pages 147-150

J. Ortmanns
Institute of Fluid Mechanics, Technical University Braunschweig, Bienroder Weg 3, 38106 Braunschweig, Germany

M. Bitter
Institute of Fluid Mechanics, Technical University Braunschweig, Bienroder Weg 3, 38106 Braunschweig, Germany

Christian J. Kahler
Institute for Fluid Mechanics and Aerodynamics Universitat der Bundeswehr Munchen (UniBw) Werner-Heisenberg-Weg 39, 85577 Neubiberg, Germany

Аннотация

This contribution summarizes the investigations of two flat plate experiments in a water tunnel which deal with the dynamic response and the characteristics of a turbulent boundary layer in interaction with coherent structures induced by dynamic vortex generator jets. The results show that the characteristics of the turbulent fluctuations are nearly unaffected by the flow control process. This allows a separation of scales for physical interpretation and numerical simulation. Secondly, the initial blowing produces an increasing mixing force compared to the steady blowing case, which is even present at high duty-cycles. It is independent of the duty-cycle but varies with the blowing ratio. By considering decay and rebirth of the dynamic vortex structures a new estimation of an optimal frequency for this flow control strategy can be established.

ICHMT Digital Library

Bow shocks on a jet-like solid body shape. Thermal Sciences 2004, 2004. Pulsed, supersonic fuel jets - their characteristics and potential for improved diesel engine injection. PULSED, SUPERSONIC FUEL JETS - THEIR CHARACTERISTICS AND POTENTIAL FOR IMPROVED DIESEL ENGINE INJECTION
View of engine compartment components (left). Plots of temperature distributions in centreplane, forward of engine (right). CHT-04 - Advances in Computational Heat Transfer III, 2004. Devel... DEVELOPMENT AND CURRENT STATUS OF INDUSTRIAL THERMOFLUIDS CFD ANALYSIS
Pratt & Whitney's F-135 Joint Strike Fighter Engine under test in Florida is a 3600F class jet engine. TURBINE-09, 2009. Turbine airfoil leading edge stagnation aerodynamics and heat transfe... TURBINE AIRFOIL LEADING EDGE STAGNATION AERODYNAMICS AND HEAT TRANSFER - A REVIEW
Refractive index reconstructed field. (a) Second iteration. (b) Fourth iteration. Radiative Transfer - VI, 2010. Theoretical development for refractive index reconstruction from a radiative ... THEORETICAL DEVELOPMENT FOR REFRACTIVE INDEX RECONSTRUCTION FROM A RADIATIVE TRANSFER EQUATION-BASED ALGORITHM
Two inclusion test, four collimated sources. Radiative Transfer - VI, 2010. New developments in frequency domain optical tomography. Part II. Application with a L-BFGS associated to an inexa... NEW DEVELOPMENTS IN FREQUENCY DOMAIN OPTICAL TOMOGRAPHY. PART II. APPLICATION WITH A L-BFGS ASSOCIATED TO AN INEXACT LINE SEARCH