nasa and boeing tests confirm using slots in …...boeing completed a full scale test on a 737 cfm...

www.ikonicsams.com NASA and BOEING TESTS CONFIRM USING SLOTS IN ACOUSTIC LINERS REDUCES DRAG AND NOISE Tests are focused on industry demand for better fuel economy and less aircraft noise NASA examined several thru-hole configurations and determined that slots instead of traditional round holes in the acoustic liner (with air passing perpendicular to the slots) had the greatest effect on reducing drag by as much as 50%. 2 Boeing completed a full scale test on a 737 CFM Leap 1B engine prototype using a slot pattern and results showed that “acoustic and drag benefits prove better than expected.” 3 IKONICS Precision Abrasive Machining can perforate slots in acoustic liners without the challenges associated with traditional machining. NEW SLOT GEOMETRY This new geometry cut the penalty between a smooth wall and a conventional roundhole perforate ~50% without detrimental effect on the liner’s acoustic performance. 2 CONVENTIONAL VS. SLOTS Slots with flow running perpendicular reduced drag by up to 50% vs. standard round holes. 1,2 References: 1. Howerton, B., Jones, M. “Acoustic Liner Drag: Measurements on Novel Facesheet Perforate Geometries”, 22nd AIAA/CEAS Aeroacoustics Conference, Aeroacoustics Conferences. Lyon, France, 30 May – 1 June, 2016. AIAA 2016-2979. AIAA. Print. 2. Howerton, B., Jones, M., Jasinski, C. “Acoustic Liner Drag: Further Measurements on Novel Facesheet Perforate Geometries”, 2018 AIAA/CEAS Aeroacoustics Conference, AIAA AVIATION Forum. Atlanta, Georgia, June 25-29, 2018. AIAA 2018-3605. AIAA. Print. 3. Norris, G. “Boeing-NASA Low-Drag, Low-Noise Engine Feature Beats Expectations”, Aviation Week & Space Technology. August 28, 2018. Online. Changing from round holes to SLOTS in the acoustic liner makes a big difference. Up to 50% less DRAG with acoustic benefits as well. 1,2 Resistance Factor Conventional Perp Slot 0 10 20 M=0.3 M=0.5 M=Mach Speeds

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Page 1: NASA and BOEING TESTS CONFIRM USING SLOTS IN …...Boeing completed a full scale test on a 737 CFM Leap 1B engine prototype using a slot pattern and results showed that “acoustic

www.ikonicsams.com

NASA and BOEING TESTS CONFIRM USING SLOTS IN ACOUSTIC LINERS REDUCES DRAG AND NOISE

Tests are focused on industry demand for better fuel economy and less aircraft noise

NASA examined several thru-hole configurations and determined that slots instead of traditional round holes in the acoustic liner (with air passing perpendicular to the slots) had the greatest effect on reducing drag by as much as 50%.2

Boeing completed a full scale test on a 737 CFM Leap 1B engine prototype using a slot pattern and results showed that “acoustic and drag benefits prove better than expected.”3

IKONICS Precision Abrasive Machining can perforate slots in acoustic liners without the challenges associated with traditional machining.

NEW SLOT GEOMETRY

This new geometry cut the penalty between a smooth wall and a conventional roundhole perforate ~50% without detrimental effect on the liner’s acoustic performance.2

CONVENTIONAL VS. SLOTS

Slots with flow running perpendicular reduced drag by up to 50% vs. standard round holes.1,2

References:1. Howerton, B., Jones, M. “Acoustic Liner Drag: Measurements on Novel Facesheet Perforate Geometries”, 22nd AIAA/CEAS Aeroacoustics Conference, Aeroacoustics Conferences. Lyon, France, 30 May – 1 June, 2016. AIAA 2016-2979. AIAA. Print.2. Howerton, B., Jones, M., Jasinski, C. “Acoustic Liner Drag: Further Measurements on Novel Facesheet Perforate Geometries”, 2018 AIAA/CEAS Aeroacoustics Conference, AIAA AVIATION Forum. Atlanta, Georgia, June 25-29, 2018. AIAA 2018-3605. AIAA. Print.3. Norris, G. “Boeing-NASA Low-Drag, Low-Noise Engine Feature Beats Expectations”, Aviation Week & Space Technology. August 28, 2018. Online.

Changing from round holes to SLOTS in the acoustic liner makes a big difference. Up to 50% less DRAG with acoustic benefits as well.1,2

Resi

stan

ce F

acto

Convention

Perp Slot

M=0.3 M=0.5

M=Mach Speeds

Page 2: NASA and BOEING TESTS CONFIRM USING SLOTS IN …...Boeing completed a full scale test on a 737 CFM Leap 1B engine prototype using a slot pattern and results showed that “acoustic

IKONICS Precision Abrasive Machining

IKONICS Advantages include no delamination, stress or pulled fibers.

IKONICS Technology can support a variety of precise features, shapes, and sizes in composite materials such as carbon fiber and fiberglass.

IKONICS Advanced Material Solutions 4832 Grand Avenue, Duluth, MN 55807 USA (218) 628-2217 | (800) 328-4261 ext.352 | www.ikonicsams.com | [email protected]

An IKONICS Company ISO 9001 Certified ITAR Compliant NASDAQ Listed: IKNX

CNCSidewall damage (pulled fibers)

Water JetSidewall damage (delamination)

PAM Abrasive ProcessClean, smooth sidewall

181112

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To view the referenced NASA and Boeing reports and get more information on IKONICS Precision Abrasive Machining, go to: www.ikonicsams.com

For more information contact: Tim Bergstrom, Sr. Application & Sales Specialist (218) 624-6451 cell: (218) 491-0783 [email protected]

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