NASA’s incredible supersonic advance

Source: News Corp Australia Network:

March 7, 2019 at 13:20

NASA has been able to capture the first air-to-air images of the interaction of shockwaves from two supersonic aircraft flying in formation. Picture: NASASource:Supplied

NASA wants to build a revolutionary supersonic aircraft that doesn’t produce a sonic boom when it breaks the sound barrier, and this will certainly help.

NASA has long wanted to better understand the finer details of how supersonic shockwaves work in order to design a better and quieter supersonic aircraft.

The space agency has achieved an important milestone in this quest that has been a decade in the making — and the visuals are absolutely stunning.

As part of its research, NASA has captured unprecedented photos it says are the first images of the interaction of shockwaves from two supersonic aircraft in flight.

The pictures show two T-38 supersonic jetliners tearing through the atmosphere and creating sonic shockwaves.

Thanks to some heavy-duty upgrades to their camera technology, NASA scientists could hardly believe what they saw when the images were developed.

“We never dreamt that it would be this clear, this beautiful,” said JT Heineck of NASA’s Ames Research Center in a statement.

NASA has been able to capture the first air-to-air images of the interaction of shockwaves from two supersonic aircraft flying in formation.Source:Supplied

Shockwaves are created by aircraft flying faster than the speed of sound. The shockwaves produced by aircraft merge together as they travel through the atmosphere and are responsible for what is heard on the ground as a loud sonic boom. Ultimately, NASA wants to design a supersonic aircraft that rumbles rather than booms when it crashes through the sound barrier.

The latest research will inform its plans to build its experimental X-59 QueSST quiet supersonic jet dubbed “the son of Concorde” which it began work on late last year.

According to NASA, the unique supersonic aircraft will “produce shockwaves in such a way that, instead of a loud sonic boom, only a quiet rumble may be heard”.

Once that is achieved, it could result in the scrapping of restrictions on supersonic flights over land.

One of the greatest challenges of the flight series was timing, NASA said. The images were captured as a result of all three aircraft being in the exact right place at the exact right time. Picture: NASASource:Supplied

When aircraft fly faster than the speed of sound, shockwaves travel away from the vehicle and are heard on the ground as a sonic boom. NASA researchers use this imagery to study these shockwaves as part of the effort to make sonic booms quieter. Picture: NASASource:Supplied

The photos above were taken by sophisticated camera equipment that was upgraded to achieve a wider field of view and a frame rate to 1400 frames per second.

It was then placed on a plane that flew about 600 metres away from the two T-38 jets as they flew in formation less than 10 metres apart from each other.

“I am ecstatic about how these images turned out,” said Mr Heineck. “With this upgraded system, we have, by an order of magnitude, improved both the speed and quality of our imagery from previous research.”

For the first time, the interaction of the shocks can be seen in flight, NASA says.

“What’s interesting is, if you look at the rear T-38, you see these shocks kind of interact in a curve,” said Neal Smith, a research engineer with AerospaceComputing Inc. at NASA’s Ames fluid mechanics laboratory.

“This is because the trailing T-38 is flying in the wake of the leading aircraft, so the shocks are going to be shaped differently. This data is really going to help us advance our understanding of how these shocks interact.”

NASA says the data from the flights will continue to undergo analysis.