scholarly journals Experimental investigation of hybrid laminar flow control by a modular flat plate model in the DNW-NWB

2021 ◽  
Author(s):  
Heinrich Lüdeke ◽  
Christian Breitenstein
Keyword(s):  
Boundary Layer ◽  
Wind Tunnel ◽  
Laminar Flow ◽  
Flow Control ◽  
Flat Plate ◽  
Detailed Examination ◽  
Tunnel Model ◽  
Laminar Flow Control ◽  
Layer Flow ◽  
Numerical Approaches

AbstractTo determine the characteristics of new suction concepts for hybrid laminar flow control (HLFC) a modular flat plate wind tunnel model is investigated in the DNW-NWB wind tunnel facility. This approach allows detailed examination of suction characteristics in consideration of realistic boundary layer flow conditions. The following evaluation reveals the effects of joining methods between successive panels and other surface disturbances of porous materials and underlying chambers on HLFC techniques. After successful measurements with and without suction panels, this paper compares experimental results with theoretical and numerical approaches and draws conclusions from N-factor results and boundary layer (BL) measurements.

Lift-to-drag ratio and laminar flow control of a morphing laminar wing in a wind tunnel

2011 ◽  
Vol 20 (3) ◽  
pp. 035019 ◽  
Author(s):  
Daniel Coutu ◽  
Vladimir Brailovski ◽  
Patrick Terriault ◽  
Mahmoud Mamou ◽  
Youssef Mébarki ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
Laminar Flow ◽  
Flow Control ◽  
Laminar Flow Control ◽  
Drag Ratio ◽  
Lift To Drag Ratio

Towards transition modelling for supersonic laminar flow control based on spanwise periodic roughness elements

2005 ◽  
Vol 363 (1830) ◽  
pp. 1079-1096 ◽  
Author(s):  
Meelan Choudhari ◽  
Chau-Lyan Chang ◽  
Li Jiang
Keyword(s):  
Boundary Layer ◽  
Laminar Flow ◽  
Flow Control ◽  
Leading Edge ◽  
Design And Optimization ◽  
Supersonic Aircraft ◽  
Laminar Flow Control ◽  
Key Enabling Technologies ◽  
Novel Concept ◽  
Prediction Approach

Laminar flow control (LFC) is one of the key enabling technologies for quiet and efficient supersonic aircraft. Recent work at Arizona State University (ASU) has led to a novel concept for passive LFC, which employs distributed leading edge roughness to limit the growth of naturally dominant crossflow instabilities in a swept-wing boundary layer. Predicated on nonlinear modification of the mean boundary-layer flow via controlled receptivity, the ASU concept requires a holistic prediction approach that accounts for all major stages within transition in an integrated manner. As a first step in developing an engineering methodology for the design and optimization of roughness-based supersonic LFC, this paper reports on canonical findings related to receptivity plus linear and nonlinear development of stationary crossflow instabilities on a Mach 2.4, 73° swept airfoil with a chord Reynolds number of 16.3 million.

Numerical Simulation of Laminar Boundary Layer Flow Over a Horizontal Flat Plate in External Incompressible Viscous Fluid

2021 ◽  
Author(s):  
Ali Belhocine ◽  
Nadica Stojanovic ◽  
Oday Ibraheem Abdullah
Keyword(s):  
Boundary Layer ◽  
Laminar Flow ◽  
Flat Plate ◽  
Laminar Boundary Layer ◽  
Boundary Layer Flow ◽  
Solution Procedure ◽  
Dimensionless Temperature ◽  
Plane Plate ◽  
Fluid Properties ◽  
Layer Flow

In this paper, steady laminar boundary layer flow of a Newtonian fluid over a flat plate in a uniform free stream was investigated numerically when the surface plate is heated by forced convection from the hot fluid. This flow is a good model of many situations involving flow over fins that are relatively widely spaced. All the solutions given here were with constant fluid properties and negligible viscous dissipation for two-dimensional, steady, incompressible laminar flow with zero pressure gradient. The similarity solution has shown its efficiency here to transform the governing equations of the thermal boundary layer into a nonlinear, third-order ordinary differential equation and solved numerically by using 4th-order Runge-Kutta method which in turn was programmed in FORTRAN language. The dimensionless temperature, velocity, and all boundary layer functions profiles were obtained and plotted in figures for different parameters entering into the problem. Several results of best approximations and expressions of important correlations relating to heat transfer rates were drawn in this study of which Prandtl’s number to the plate for physical interest was also discussed across the tables. The same case of solution procedure was made for a plane plate subjected to other thermal boundary conditions in a laminar flow. Finally, for the validation of the treated numerical model, the results obtained are in good agreement with those of the specialized literature, and comparison with available results in certain cases is excellent.

HYBRID LAMINAR FLOW CONTROL TESTS IN THE BOEING RESEARCH WIND TUNNEL

1990 ◽  
Author(s):  
P.G. Parikh ◽  
D.W. Lund ◽  
D. George-Falvy ◽  
A.L. Nagel
Keyword(s):  
Wind Tunnel ◽  
Laminar Flow ◽  
Flow Control ◽  
Laminar Flow Control
Sign in / Sign up

Export Citation Format

Share Document