Modern-Aviation

Aircraft And Military Development & Applications

The European Space Agency is auditing the technical development of Sabre ? (Brexit)

Sabre would burn hydrogen in the oxygen it scoops from the air

Achieving this flight profile is a challenge in managing temperature extremes.
The essential innovations include a compact pre-cooler heat-exchanger that can take an incoming airstream in the region of 1,000C and cool it to -150C in less than 1/100th of a second.

REL proved the pre-cooler's efficiency at taking an ambient air stream to low temperature in 2012. Now it must do the same in a very high-temperature regime. This is the purpose of the Colorado tests.

"To have a very high-temperature, high-volume flow of air to test the pre-cooler - we needed a new facility. That is now complete," explains Shaun Driscoll, REL's programmes director

"We will be running tests in the next month or two. We will be using re-heated aero engines to drive air through the system. We will drive air into the pre-cooler at up to 1,000C."

Sabre, at a fundamental level, can be divided into three sections - the pre-cooler front-end; a core combustion section with a smart thermodynamic cycle to again manage heat and fluid flow; and a relatively conventional rocket arrangement at the rear.

It's the core section that is having a new test facility built for it at the Wetscott space park, the site of Britain's post-war Rocket Propulsion Establishment.

New building: On the site of Britain's post-war Rocket Propulsion Establishment

The building is nearing the end of its preparation and the design work on the core of Sabre is also moving towards its conclusion.
"The core can be tested on the ground, but it's the core that gets you air-breathing from the ground up to the edge of space, at which point there is no more oxygen to breathe and the system transitions to the pure rocket mode, " Mr Driscoll said.
REL is a private venture with the backing of aerospace giants BAE Systems, Rolls-Royce and Boeing. It has also received significant R&D support from the UK government.

Esa's propulsion specialists act as technical auditors, assessing each step in the development of the Sabre concept.

"The positive conclusion of our Preliminary Design Review marks a major milestone in Sabre development," commented Esa's Mark Ford.

"It confirms the test version of this revolutionary new class of engine is ready for implementation."

Courtesy: By Jonathan Amos 2019