Experimental Transition and Boundary-Layer Stability Analysis for a Slotted Swept Laminar Flow Control Airfoil

1990 ◽  
pp. 373-390
Author(s):  
William D. Harvey ◽  
Charles D. Harris ◽  
Cuyler W. Brooks
Keyword(s):  
Boundary Layer ◽  
Stability Analysis ◽  
Laminar Flow ◽  
Flow Control ◽  
Boundary Layer Stability ◽  
Laminar Flow Control ◽  
Experimental Transition

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.

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.

Status and perspectives of laminar flow

2005 ◽  
Vol 109 (1102) ◽  
pp. 639-644 ◽  
Author(s):  
G. Schrauf
Keyword(s):  
Boundary Layer ◽  
Laminar Flow ◽  
Flow Control ◽  
Boundary Layer Transition ◽  
Technology Readiness ◽  
Layer Transition ◽  
The Status ◽  
Natural Laminar Flow ◽  
Laminar Flow Control

AbstractAfter identifying the ecological and economic drivers for use of laminar flow technology, we outline the mechanisms of laminarturbulent boundary layer transition and review the status of natural laminar flow (NLF) and hybrid laminar flow control (HLFC). New ways to reduce the complexity of HLFC systems are presented, and the remaining steps to achieve technology readiness are discussed.

A methodology for optimal laminar flow control: Application to the damping of Tollmien–Schlichting waves in a boundary layer

2003 ◽  
Vol 15 (5) ◽  
pp. 1131-1145 ◽  
Author(s):  
Christophe Airiau ◽  
Alessandro Bottaro ◽  
Steeve Walther ◽  
Dominique Legendre
Keyword(s):  
Boundary Layer ◽  
Laminar Flow ◽  
Flow Control ◽  
Tollmien Schlichting ◽  
Laminar Flow Control ◽  
Control Application

Pre-Flight Boundary-Layer Stability Analysis of BOLT Geometry

2018 ◽  
Author(s):  
Alexander Moyes ◽  
Travis S. Kocian ◽  
Charles D. Mullen ◽  
Helen L. Reed
Keyword(s):  
Boundary Layer ◽  
Stability Analysis ◽  
Boundary Layer Stability
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