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


DOI: 10.1615/ICHMT.2014.IntSympConvHeatMassTransf.570
pages 755-764

Abdussamet Subasi
Mechanical Engineering Department Istanbul Technical University, 34437 Istanbul, Turkey

Hasan Gunes
Mechanical Engineering Department Istanbul Technical University, 34437 Istanbul, Turkey


In order to improve the aerodynamic performance, there are various flow control methods which can be classified as active and passive. This work aims to conduct a numerical study on the effects of discrete heating, as a mean of an active flow control on the boundary layer transition over a flat plate. Flash-mounted discrete heater strips of various lengths are positioned at appropriate locations on a flat plate surface (corresponding the laminar, transitional and turbulent flow regions) in order to investigate the effects of heating on the skin friction coefficient. Two- and three-dimensional Computational Fluid Dynamics (CFD) simulations are carried out with Ansys-Fluent software using 20 m/s constant inlet velocity with 1 % free stream turbulence intensity and 50 K temperature difference with the free stream on the heater strips subject to constant wall temperature boundary condition on a 2 m long thin flat plate. Recently implemented Menter's k−ω SST (Shear Stress Transport) transition model is employed due to its superiority on predicting laminar to turbulent transition. The transition model validation is determined by comparing the simulation results with the well-known correlation equations and the experimental data for isothermal flat plate conditions. Simulation results revealed that the location and length of the heater strips has a significant effect on the laminar to turbulent transition and aerodynamic performance, and the average skin friction on a flat plate can be reduced by heating.

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