India to test ramjet engine
The competition heats up: India plans to test an experimental air-breaking scramjet rocket engine sometime next week.
The article provides almost no details about the August 28 test, including whether it is a static fire test on the ground or will be flown.
On Christmas Eve 1968 three Americans became the first humans to visit another world. What they did to celebrate was unexpected and profound, and will be remembered throughout all human history. Genesis: the Story of Apollo 8, Robert Zimmerman's classic history of humanity's first journey to another world, tells that story, and it is now available as both an ebook and an audiobook, both with a foreword by Valerie Anders and a new introduction by Robert Zimmerman.
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The competition heats up: India plans to test an experimental air-breaking scramjet rocket engine sometime next week.
The article provides almost no details about the August 28 test, including whether it is a static fire test on the ground or will be flown.
On Christmas Eve 1968 three Americans became the first humans to visit another world. What they did to celebrate was unexpected and profound, and will be remembered throughout all human history. Genesis: the Story of Apollo 8, Robert Zimmerman's classic history of humanity's first journey to another world, tells that story, and it is now available as both an ebook and an audiobook, both with a foreword by Valerie Anders and a new introduction by Robert Zimmerman.
The ebook is available everywhere for $5.99 (before discount) at amazon, or direct from my ebook publisher, ebookit. If you buy it from ebookit you don't support the big tech companies and the author gets a bigger cut much sooner.
The audiobook is also available at all these vendors, and is also free with a 30-day trial membership to Audible.
"Not simply about one mission, [Genesis] is also the history of America's quest for the moon... Zimmerman has done a masterful job of tying disparate events together into a solid account of one of America's greatest human triumphs."--San Antonio Express-News
The first sentence of the article contains the answer:
“The Indian Space Research Organisation (ISRO) is readying to conduct air-breathing propulsion experiment next week using its RH-560 rocket fitted with a supersonic combustion ramjet (Scramjet) engine.”
Scramjets have to be moving at Mach 4 – 5 before they start working. American scramjet tests have achieved speeds of up to Mach 10. India is doing what we have always done when testing scramjets; using a rocket to boost the test article up to operating speed.
There really isn’t any alternative. There are very few wind tunnels anywhere that can generate flows in the Mach 4 – 10 range. None of them can do so for more than a second. That’s a useful duration for testing shapes and structures, but one needs sustained airflow to test engines.
One also needs the flow to be actual air. The best hypersonic wind tunnel in the U.S. is Hypervelocity Wind Tunnel 9 in Silver Spring, MD. It can generate flow speeds up to Mach 16, but the flows are pure nitrogen.
Hypersonic wind tunnel flows are hot as well as fast. One supposes that using actual air would likely result in the oxygen and nitrogen combusting into various oxides of nitrogen. Not a good environment in which to test anything dependent on any other form of combustion.