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Logo Sustainable and Energy Efficient Aviation of TU Braunschweig
B1.4 - Transition Prediction and Design of Hybrid Laminar Flow Control on Blended Wing Bodies Based on 3D Parabolized Stability Equations
  • ICA B "Flight Physics and Vehicle Systems"
    • B5.2 - Application of physics-based finite-element tools in stiffness tailored structures for cryogenic hydrogen storage for improved mechanical and thermo-mechanical response
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    • B3.5 - Production technologies for hybrid suction designs - Bonding of micro-perforated sheets for hybrid laminar flow control suction panels
    • B3.2 - Advancing the additive xHLFC suction panel concept towards wind-tunnel readiness
    • B3.1 - Protective, multifunctional suction shells for hybrid laminar flow control: Design, integration, simulation and testing
    • B2.5 - EverScale - Enhancement and verification of load alleviation technologies by subscale flight testing
    • B2.4- Hybrid load alleviation by fluidic/reversed control and nonlinear structures
    • B2.3 - ARGO2 - Integrated design of control methods for stability of elastic aircraft
    • B1.9 - Validation of turbulent boundary layer-induced sound transmission through a fuselage section
    • B1.8 - Wind-tunnel experiments of advanced design of swept-wing with suction surfaces
    • B1.7 - Extension of Correlation-based Transition Transport Models for Laminar Aircraft Design
    • B1.6 - Effective Design Methods and Design Exploration for Laminar Wing and Fuselage
    • B1.5 - Sensitivities of Laminar Suction Boundary Layers for Large Reynolds Numbers
    • B1.3- Physics of broadband noise of sound sources from installed propulsors
    • JRG-B1 - Physics of Laminar Wing and Fuselage
    • JRG-B2 - Flow Physics of Load Reduction
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    • B1.2 - Aerodynamic analysis of partly embedded boundary layer ingesting propulsors
    • B1.3 - Fast non empiric prediction of propulsion installation related noise
    • B1.4 - Transition Prediction and Design of Hybrid Laminar Flow Control on Blended Wing Bodies Based on 3D Parabolized Stability Equations
    • B2.1 - Load reduction potential of nonlinear stiffness and damping technologies
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    • B2.3 - Active load Reduction for enabling a 1-G wing using fOrward-looking and distributed sensors (ARGO)
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    • B3.1 - Global and Local Design Methodology for Laminar Flow Control
    • B3.2 - Process simulation and multiscale manufacturing of suction panels for laminar flow control
    • B3.3 - Thin Plies in Application for Next Generation Aircraft (TANGA)
    • B3.4 - New methods for failure and fatigue analysis of suction panels for laminar flow control
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    • ⯇ back to research

B1.4 - Transition Prediction and Design of Hybrid Laminar Flow Control on Blended Wing Bodies Based on 3D Parabolized Stability Equations

Background

Blended-wing-body (BWB) configurations with a significant portion of laminar boundary-layer flow are a promising design concept for future, sustainable and energy-efficient long-range aircraft. The blended three-dimensional (3D) shapes of such aircraft (A/C) are very much different from those of conventional A/C wings, however. On conventional wings, the spanwise gradients of the 3D boundary-layer flow typically are much smaller than the gradients in chordwise direction. Therefore,an infinite swept-wing (ISW) assumption is usually made for laminar-turbulent transition prediction either based on local stability theory (LST) or standard parabolized stability equations (PSE). The standard PSE approach for ISW conditions proved to model the propagation and growth of the different instability modes that trigger laminar-turbulent boundary-layer transition in a physically correct manner taking into account also the growth of the boundary layer, effects of streamline and surface curvature, and the upstream history of the instability modes. In both approaches the overall linear disturbance growth is monitored and measured by the so-called N-factor. Transition is assumed to take place at the downstream position where a previously calibrated critical N-factor value is reached for the first time.

On the 3D shape of blended wing bodies the ISW assumption becomes invalid, due to the fully 3D nature of the boundary-layer flow field. Therefore, the standard PSE approach is no longer appropriate and should be replaced by more advanced PSE-3D concepts which also take spanwise gradients into account. Adjoint parabolized stability equations can be derived which then have to be solved by a marching procedure with reversed marching direction. The adjoint PSE provide information about the sensitivity of the boundary-layer flow and have been used successfully to model certain linear receptivity mechanisms.

A tool chain based on direct and adjoint Navier-Stokes solvers coupled with direct and adjoint PSE-3D solvers would allow an iterative gradient-based shape and suction optimization and thus provide the required design capabilities for hybrid laminar flow control on BWB.

 

Objectives

  1. Establish the know-how and skills for a physically justified N-factor based transition prediction on 3D shapes like blended wing bodiesand the validation of the proposed transition prediction strategy
  2. Development of efficient gradient-based design capabilities for optimized hybrid laminar flow control concepts aiming at viscous drag reduction on fully 3D shapes.

Details of the project

Contact

Project members

Dr. Stefan Hein

Project lead
+49 551 709-2687

Daniel Simanowitsch

Scientific Assistant
+49 551 709-2134

 

Organisation

Institute of Aerodynamics and Flow Technology
High Speed Configurations


German Aerospace Center (DLR)
Bunsenstr. 10
37073 Göttingen

 

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Cluster of Excellence SE²A –
Sustainable and Energy-Efficient Aviation
Technische Universität Braunschweig
Hermann-Blenk-Str. 42
38108 Braunschweig

se2a(at)tu-braunschweig.de
+49 531 391 66661

 

 

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