NASA Provides Results Of Scramjet Test

Guinnessy writes "Last March, NASA carried out the world's first test flight of a scramjet-powered aircraft. The Industrial Physicist has the latest results from this test. According to the article scramjet-powered missiles and aircraft could be in mass production as early as 2010. This piece is also a good introduction for those unfamilar with scramjet technology."

Comments

Great news!

[AKAImBatman]

One thing that has often concerned me is the matter of lift from the wings/lifting body. Obviously this design should be able to go into orbit with a relatively minor assist from rocket engines. However, how much lift does it actually get? Is it possible to build a craft that can use wing lift all the way up to LEO? If so, could it then be possible to obtain a flight envelope on the way back down?

The primary reason why I've concerned myself with this, is that the Space Shuttle literally "falls" out of orbit in a very steep dive. The idea is to re-enter somewhere over the Pacific and shed enough speed to land just before the Atlantic. Obviously, it was important the normal flight operations didn't overfly the USSR. The problem with this sort of profile is that the Shuttle takes on a tremendous heat load from the aero-braking. Yet there's nothing really inherent in the atmosphere that says the the Shuttle MUST take on that load.

To get to the point, would it be possible to return in a glide or powered flight without the requirement of a heat shield? i.e. Could a vehicle obtain a thin-atmosphere flight envelope and reduce its speed at a more gradual rate? Perhaps even to the point where no shielding is required?

Any aerospace engineers in the know want to comment?

Re:Great news!

[AeroNate]

Any aerospace engineers in the know want to comment?

Well, I am not an expert in reentry, but I'll take a crack at your question. I think the important thing is not maximum heating, but rather some integral of heating over time. If the shuttle or other vehicle entered more gradually, it may be that it would actually reach a higher temperature because it would have more time to soak up the heat from the plasma around it. No matter how well you insulate something, eventually it has to reach practically the same temperature as its surroundings. You hope to get on the ground long before that happens.

Wings are heavy and delicate, and it would be hard to imagine that they could be large enough to significantly lift the craft at high altitude and lower speed and still survive the heating. (The heavier the wings are, the more kinetic energy you need to dissipate to slow down--and the more heating you get.) IMHO wings are a dumb thing to carry into space with you. Lifting bodies are better.

It is just what we need.

[Behrooz]

It is just what we need. Or rather, it's a good stepping stone on the way to orbit.

Mach 15 at 100,000 feet is 10,200 MPH, which is also roughly equivalent to the following critical hurdles to cheap space travel:

10% of the ~185-mile altitude required for a stable orbit.
59% of the ~7.7 km/sec required to achieve low-earth orbital velocity.

NASA's budget is a drop in the bucket, approximately $15B out of total discretionary spending exceeding $850B, with a total federal budget exceeding $2.2 trillion... hah.

Hypersonic aerospace research is a good idea simply on its own merits, regardless of present applications. I certainly look forward to 90-minute sub-orbital shuttles from London to Tokyo, and being able to put things in orbit for less than $10,000/pound.

Re:Zero to 5000 in 10 seconds?

[Lord Kano]

Not exactly, it was carried atop a regular airplay at several hundred miles per hour, then the rocket booster kicked it up to the cruising altitude and THEN the scramjet engine was engaged for the 10 second burn.

It's damned impressive but it's not like it accellerated to 5000 mph from a standstill.

LK

Re:I call your bluff, sir

[gilroy]

OK. By the way, this is from less than two minutes of a Google search... it's particularly low-hanging fruit available to anyone who's open enough to actually, you know, look.

"Commercially available infant formulas now contain a nutritional enrichment ingredient that traces its existence to NASA-sponsored research that explored the potential of algae as a recycling agent for long duration space travel." (ref)

Ski wear: "The NASA association began back in the 1970s, when Comfort Products adapted astronaut protective clothing technology to ski boot design. Specifically, the company borrowed heating element circuitry that kept Apollo astronauts warm or cool in the temperature extremes of the Moon, and used it to create built-in rechargeable footwarming devices that were supplied to leading ski boot manufacturers." (ref, emphasis added)

"In 1965, Johnson Space Center contracted with the University of Minnesota to explore the then-known but little-developed concept of impedance cardiography (ICG) as a means of astronaut monitoring. A five-year program led to the development of the Minnesota Impedance Cardiograph (MIC), an electronic system for measuring impedance changes across the thorax that would be reflective of cardiac function and blood flow from the heart's left ventricle into the aorta... the cost of the thermodilution technique [the old, invasive way] runs five to 17 times that of IQ monitoring [the new, NASA-developed way]"(ref)

"GROUND PROCESSING SCHEDULING SYSTEM - Computer-based scheduling system that uses artificial intelligence to manage thousands of overlapping activities involved in launch preparations of NASA's Space Shuttles. The NASA technology was licensed to a new company which developed commercial applications that provide real-time planning and optimization of manufacturing operations, integrated supply chains, and customer orders" (ref)

"STRUCTURAL ANALYSIS - This NASA program, originally created for spacecraft design, has been employed in a broad array of non-aerospace applications, such as the automobile industry, manufacture of machine tools, and hardware designs."(ref)

"SCRATCH-RESISTANT LENSES - A modified version of a dual ion beam bonding process developed by NASA involves coating the lenses with a film of diamond-like carbon that not only provides scratch resistance, but also decreases surface friction, reducing water spots." (ref)

"MICROSPHERES - The first commercial products manufactured in orbit are tiny microspheres whose precise dimensions permit their use as reference standards for extremely accurate calibration of instruments in research and industrial laboratories. They are sold for applications in environmental control, medical research, and manufacturing."(ref)

"SOLAR ENERGY - NASA-pioneered photovoltaic power system for spacecraft applications was applied to programs to expand terrestrial applications as a viable alternative energy source in areas where no conventional power source exists."(ref)

"DIGITAL IMAGING BREAST BIOPSY SYSTEM - The LORAD Stereo Guide Breast Biopsy system incorporates advanced Charge Coupled Devices (CCDs) as part of a digital camera system. The resulting device images breast tissue more clearly and efficiently. Known as stereotactic large-core needle biopsy, this nonsurgical system developed with Space Telescope Technology is less traumatic and greatly reduces the pain, scarring, radiation exposure, time, and money associated with surgical biopsies."(