NASA Crossflow Attenuated Natural Laminar Flow (CATNLF) CATNLF Flight Test Advancing laminar flow technology through flight testing
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NASA National Aeronautics and Space Administration NASA Crossflow Attenuated Natural Laminar Flow (CATNLF) CATNLF Flight Test Advancing laminar flow technology through flight testing By Dr. Pankaj Dhussa
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NASA Crossflow Attenuated Natural Laminar Flow (CATNLF) CATNLF Flight Test Advancing laminar flow technology through flight testing
- 1. CATNLF Flight Test Advancing laminar flow technology through flight testing Challenge - One path towards reducing emissions and fuel burn is by implementing drag-reduction technology - Laminar flow is known to reduce vehicle drag by reducing skin friction and profile drag - Natural laminar flow is desirable because it does not require additional systems to obtain benefit, but has historically been limited to either small components or vehicles that fly slowly Predictions of laminar flow extents on the CATNLF Flight Test article Instrumentation cavity on the CATNLF Flight Test article Crossflow Attenuated Natural Laminar Flow Expected Impacts - Laminar flow on the upper surface of the main wing offers the largest potential for drag reduction - For a 777-sized aircraft, 60% laminar flow on the wing upper surface could provide between 5-10% fuel burn savings - Next-generation configurations account for performance benefit from laminar flow to meet emissions objectives Solution - Crossflow Attenuated Natural Laminar Flow (CATNLF) technology provides a path toward obtaining natural laminar flow on the wing of typical transonic transports without having to reduce the speed - CATNLF is an aerodynamic design approach that changes the shape of the airfoils to obtain pressure distributions known to control instabilities that lead to boundary layer transition Results to Date - Several Computational Fluid Dynamics (CFD) studies provided data needed to develop the technology - A wind tunnel test in the National Transonic Facility was used to confirm the computational predictions - A flight test utilizing the F-15B and Centerline Instrumented Pylon (CLIP) testbed is underway to advance the technology Current Flight Test Effort - CATNLF Flight Test will provide opportunity to study laminar flow in a realistic flight environment - A wing-like test article was designed using CATNLF technology to be flown underneath the F-15 and have large extents of laminar flow - Test article is instrumented to gather useful experimental data to advance technology - First flight scheduled for Summer 2024 CATNLF Partners Centers • NASA Langley Research Center, Research Leads • NASA Armstrong Flight Research Center, Flight Test Leads Projects • Advanced Air Transport Technology, Research Development • Flight Demonstrations and Capabilities, Flight Test Execution Computational Study Wind Tunnel Test Flight Test Test article 2014 – 2017 2017– 2019 2019 – Present Goal: To develop technology Reference: AIAA 2016-4326 Goal: To confirm computations References: AIAA 2017-3058, AIAA 2019-3292 Goal: To advance technology Reference: AIAA 2021-0173 Research POC: Michelle Banchy (michelle.n.banchy@nasa.gov) | Flight Testing POC: Mike Frederick (mike.frederick-1@nasa.gov) Flow Laminar Turbulent