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

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.

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Boundary Layer Stability Analysis of a Natural Laminar Flow Glove on the F-lll TACT Airplane

Viscous Flow Drag Reduction ◽

10.2514/5.9781600865466.0017.0032 ◽

1980 ◽

pp. 17-32 ◽

Cited By ~ 2

Keyword(s):

Boundary Layer ◽

Stability Analysis ◽

Laminar Flow ◽

Boundary Layer Stability ◽

Natural Laminar Flow

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Coupled Boundary-Layer Suction and Airfoil Optimization for Hybrid Laminar Flow Control

AIAA Journal ◽

10.2514/1.j060480 ◽

2021 ◽

pp. 1-16

Author(s):

Anand Sudhi ◽

Ali Elham ◽

Camli Badrya

Keyword(s):

Boundary Layer ◽

Laminar Flow ◽

Flow Control ◽

Airfoil Optimization ◽

Boundary Layer Suction ◽

Laminar Flow Control

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

CEAS Aeronautical Journal ◽

10.1007/s13272-021-00564-0 ◽

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.

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Influence of Surface Irregularities on the Expected Boundary-Layer Transition Location on Hybrid Laminar Flow Control Wings

Notes on Numerical Fluid Mechanics and Multidisciplinary Design - New Results in Numerical and Experimental Fluid Mechanics XIII ◽

10.1007/978-3-030-79561-0_17 ◽

2021 ◽

pp. 174-184

Author(s):

Juan Alberto Franco Sumariva ◽

Alexander Theiss ◽

Stefan Hein

Keyword(s):

Boundary Layer ◽

Laminar Flow ◽

Flow Control ◽

Boundary Layer Transition ◽

Layer Transition ◽

Surface Irregularities ◽

Transition Location ◽

Laminar Flow Control

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Status and perspectives of laminar flow

The Aeronautical Journal ◽

10.1017/s000192400000097x ◽

2005 ◽

Vol 109 (1102) ◽

pp. 639-644 ◽

Cited By ~ 69

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.

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