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 Featured 5 min readNASA Analysis Confirms a Year of Monthly Temperature Recordsarticle3 days ago Hubble Finds Surprises Around a Star That Erupted 40 Years Ago4 min readHubble Finds Surprises Around a Star That Erupted 40 Years Agoarticle4 days ago The specks in this Mars scene were caused by charged particles6 min readNASA Watches Mars Light Up During Epic Solar Stormarticle4 days ago
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 Highlights Hubble Observes a Cosmic Fossil

	2 min read

		Hubble Observes a Cosmic Fossil

		article

			5 hours ago Voyager 1 Returning Science Data From All Four Instruments

	2 min read

		Voyager 1 Returning Science Data From All Four Instruments

		article

			16 hours ago WL20 group of stars is located in the Rho Ophiuchi star-forming region

	5 min read

		NASA’s Webb Reveals Long-Studied Star Is Actually Twins

		article

			21 hours ago
 Highlights A woman with long, wavy hair and a bright smile sits at a round table during a formal event, surrounded by other attendees. She is wearing a brown cardigan and a patterned blouse.

	5 min read

		Lakita Lowe: Leading Space Commercialization Innovations and Fostering STEM Engagement

		article

			2 days ago NASA’s Repository Supports Research of Commercial Astronaut Health

	2 min read

		NASA’s Repository Supports Research of Commercial Astronaut Health

		article

			3 days ago NASA astronaut Doug “Wheels” Wheelock and Axiom Space astronaut Peggy Whitson prepare for a test of full-scale mockups of spacesuits developed by Axiom Space and SpaceX’s Starship human landing system developed for NASA’s Artemis missions to the Moon.

	4 min read

		NASA Astronauts Practice Next Giant Leap for Artemis

		article

			1 week ago
 Highlights NASA Announces New System to Aid Disaster Response

	4 min read

		NASA Announces New System to Aid Disaster Response

		article

			19 hours ago Amendment 21: A.3 Ocean Biology and Biogeochemistry: NSPIRES cover page issue and Delay of Proposal Due Date

	2 min read

		Amendment 21: A.3 Ocean Biology and Biogeochemistry: NSPIRES cover page issue and Delay of Proposal Due Date

		article

			2 days ago 5 min read

		NASA Analysis Confirms a Year of Monthly Temperature Records

		article

			3 days ago
 Highlights The Next Full Moon is the Strawberry Moon

	17 min read

		The Next Full Moon is the Strawberry Moon

		article

			17 hours ago Mars Dunes

	5 min read

		NASA’s Perseverance Fords an Ancient River to Reach Science Target

		article

			24 hours ago Ed Stone, former director of JPL and project scientist for the Voyager mission, died on June 9, 2024. A friend, mentor, and colleague to many, he was known for his straightforward leadership and commitment to communicating with the public.

	5 min read

		Ed Stone, Former Director of JPL, Voyager Project Scientist, Dies

		article

			3 days ago
 Featured Hubble Observes a Cosmic Fossil

	2 min read

		Hubble Observes a Cosmic Fossil

		article

			5 hours ago WL20 group of stars is located in the Rho Ophiuchi star-forming region

	5 min read

		NASA’s Webb Reveals Long-Studied Star Is Actually Twins

		article

			21 hours ago Artist's illustration of a star system near the Sun that is close enough to Earth for exoplanets in their habitable zones to be directly imaged using future telescopes.

	4 min read

		Coming in Hot — NASA’s Chandra Checks Habitability of Exoplanets

		article

			2 days ago
 Highlights Hubble Observes a Cosmic Fossil

	2 min read

		Hubble Observes a Cosmic Fossil

		article

			5 hours ago Voyager 1 Returning Science Data From All Four Instruments

	2 min read

		Voyager 1 Returning Science Data From All Four Instruments

		article

			16 hours ago WL20 group of stars is located in the Rho Ophiuchi star-forming region

	5 min read

		NASA’s Webb Reveals Long-Studied Star Is Actually Twins

		article

			21 hours ago
 Highlights Illustration showing several future aircraft concepts flying over a mid-sized city with a handful of skyscrapers.

	7 min read

		ARMD Solicitations

		article

			1 week ago Team “Rumble Ready” from California State Polytechnic University, Pomona, comprised of (from left to right) Professor Mark Gonda, Nicole Xie, Junaid Bodla, Jordan Ragsac, Krishi Gajjar, Gerald McAllister III, and Leara Dominguez, took home first place at the 2024 Gateways to Blue Skies Forum held May 30-31 at NASA Ames Research Center. They are standing in a row posing for the photo; the team members are wearing blue t-shirts, black pants, and tennis shoes.

	4 min read

		Winners Announced in Gateways to Blue Skies Aeronautics Competition

		article

			2 weeks ago Graphic shows a possible future General Electric jet engine with exposed fan blades in front of a cut-away-interior view of its core mechanisms -- all part of NASA's HyTEC research project.

	4 min read

		NASA, Industry to Start Designing More Sustainable Jet Engine Core

		article

			4 weeks ago
 Highlights Simulated Roman image full of synthetic galaxies

	6 min read

		NASA’s Roman Mission Gets Cosmic ‘Sneak Peek’ From Supercomputers

		article

			2 days ago Ed Stone, former director of JPL and project scientist for the Voyager mission, died on June 9, 2024. A friend, mentor, and colleague to many, he was known for his straightforward leadership and commitment to communicating with the public.

	5 min read

		Ed Stone, Former Director of JPL, Voyager Project Scientist, Dies

		article

			3 days ago Astronaut-packaged cheese sandwiches

	2 min read

		Food Safety Program for Space Has Taken Over on Earth

		article

			4 days ago
 Featured A team from Iowa accepts its Artemis grand prize award during NASA’s Lunabotics competition on Friday, May 17, 2024, at the Center for Space Education near the Kennedy Space Center Visitor Complex in Florida.

	5 min read

		Artemis Generation Shines During NASA’s 2024 Lunabotics Challenge

		article
			2 weeks ago
 Highlights Astronaut-packaged cheese sandwiches

	2 min read

		Food Safety Program for Space Has Taken Over on Earth

		article

			4 days ago Aerial view of the coastal launch range of Wallops Flight Facility, showing a blue Atlantic Ocean on the right; white buildings along a tan coastline back up to a green, marshy landscape

	1 min read

		NASA Wallops to Support Sounding Rocket Launch

		article

			4 days ago A woman with long dark hair, wearing a dark top, stands in front of the U.S. flag and a NASA logo on a beige wall.

	5 min read

		From Psychology to Space: Alexandra Whitmire’s Journey and Impact in NASA’s Human Research Program

		article

			3 days ago
 Highlights 2021 Astronaut Candidates Stand in Recognition

	6 min read

		Diez maneras en que los estudiantes pueden prepararse para ser astronautas

		article

			3 months ago Astronaut Marcos Berrios

	4 min read

		Astronauta de la NASA Marcos Berríos

		article

			3 months ago image of an experiment facility installed in the exterior of the space station

	8 min read

		Resultados científicos revolucionarios en la estación espacial de 2023

		article

			4 months ago


2 min read Aircraft Engines are Getting Quieter—So Are Our Wind Tunnels


Glenn Communications
 A view down the test section of the newly renovated 9 x 15 wind tunnel at NASA Glenn
Credits: NASA
 NASA Glenn’s 9-by 15-Low-Speed Wind Tunnel (9 x 15 LSWT) has just completed a series of acoustic improvements that has reduced the facility’s background noise to better characterize today’s new, quieter aircraft engine fans.  The tunnel is the only facility in the country that can simulate takeoff, approach and landing in a continuous subsonic acoustic environment. Built in 1969, the 9×15 LSWT was originally used to support Short Take Off and Vertical Landing aircraft model testing. In 1986, acoustic treatment was added to the test section and, except for maintenance, it has remained essentially unchanged. Meanwhile, engine fan noise has been reduced by about one decibel per year due to technology improvements. “The primary objective of the 9×15 acoustic improvement project was to reduce the background noise levels in the test section without negatively affecting the test capabilities or flow quality,” says Facility Manager David Stark. Stark said improvements centered on adding acoustic turning vanes and acoustic baffles in three locations, replacing the test section to reduce noise generated by the original test section flow surfaces, and reshaping and adding acoustic treatment to the diffuser. Historically, 9×15 acoustic testing was performed at Mach 0.1, which is below true take-off and landing speeds, to take advantage of the lower background noise in the test section at this speed.  Open rotors and other modern concept fans, however, will require testing at higher tunnel speeds than Mach 0.1. “These improvements have brought the 9×15 back to world-class level,” Stark said. “Reducing the background noise in the test section will enable us to continue to support testing of models for engine technology development for decades.”


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 Page Last Updated:
								Aug 24, 2023
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