Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Rotary Valve Could Help Propel Craft to Mars One Day

05.04.2013
A rotary fuel delivery valve developed by a University of Alabama in Huntsville team led by Dr. James Blackmon just might help us get manned space flights out of our immediate neighborhood one day, and he says it could have practical terrestrial applications.

Dr. Blackmon, a principal research engineer at the university’s Propulsion Research Center, figures that to travel to places like Mars and beyond we’ll first have to decide what kind of fuel delivery system we’ll use to feed the rocket engines and then we’ll have to determine how we’re going to rebuild or maintain that system during long stays in space. That’s where the new valve comes in.


Michael Mercier / UAHuntsville

Dr. James Blackmon in his office with plastic models of the rotary valve made with a 3-D printer and a stainless steel version.

“There are two primary propellant feed systems, a pressurized system and a turbo pump system,” he said. The pressurized system uses tank pressure to deliver fuel. “These are fine as long as the system uses less than 300 psi pressure.” The turbo pump system uses an exhaust gas generator to power the pump. “That works up to 3,000 psi and the higher pressure gives you higher performance.”

A third system known as sequential pumping lies between those two and may be best suited for long-distance travel. In that configuration, three fuel tanks are pressurized in sequential rotation from a main tank. As the first tank is about to be expended, valves switch from it to the second tank, and then subsequently to the third tank, then back to the first tank, and so on. Tanks not being used to fire the engine are being recharged in rotation from the main tank.

“This system gives you both high pressure and fail operational ability,” Dr. Blackmon says. Rather than redundancy, where parts are duplicated so new ones can take over for failed ones, fail operational ability means that even if components in the system fail, the engine will continue to operate.

“Rocket systems are typically designed so they can sustain one failure and be safe, but to have fail operational ability is great because you don’t have to lose your mission” Dr. Blackmon said. “It is very cheap, very reliable and it gives you the same delivered payload as a turbo pump.”

The sequential system has a three to one advantage because of its lower weight, lower cost and greater reliability, but if there’s one drawback to it, it’s the valves.

“Valves are often the source of trouble in spaceflight,” Dr. Blackmon said. “You have these plunger valves slamming open or slamming closed, or ball valves clunking full open and clunking full closed.”

That’s a lot of wear and tear over time, and here is where the new rotary valve excels. It uses a mechanism operated by one of two redundant motors to turn a shaft and slide a configured recess to a port, opening that port for either fuel delivery or recharge. One valve can control filling and emptying of all three rotational fuel tanks in the sequential system, and it can replace multiple older style valves with a device that is lower weight, lower cost and more reliable.

“You can do it with standard valves but we think it’s better to do it with this because a standard valve is so difficult to repair,” Dr. Blackmon said. When it comes time for service, the rotational valve is an easy fix.

“You can use a Crescent wrench and take it apart,” said Dr. Blackmon. “It uses simple tools to fix it, and you can do it in space. If you’re going to Mars and an astronaut had to fix it, you could fix it easily with a valve repair kit without having to remove the valve. You just block it off and fix it.”

Two 3-D printed plastic rotary valve prototypes and a milled stainless steel prototype reside in Dr. Blackmon’s office, and he uses them to illustrate its operation.

“We can change the flow rate in a controlled way by the contours in the flow path and also by the rate at which you rotate the valve,” he said. “That way, as the first tank is tailing off, you can gradually increase the second tank for smooth operation. You’re not slamming valves open and closed, and it makes it much smoother in operation.”

The valve was developed and tested using just $5,000 gained as part of the Space Act Agreement initiatives for development, engineering and testing of design concepts. The money allowed former UAHuntsville graduate students David Eddleman and Chris Morton to work on design and testing in conjunction with James Richard of the Engineering Directorate at Marshall Space Flight Center. Eddleman is now an MSFC employee. MSFC testing facilities were used to test and prove the valve’s operation, as well as facilities at UAHuntsville.

Cheaper, lighter weight, dependable and easy to fix. But will it ever fly?

“That’s a very good question,” Dr. Blackmon said. “The problem is that it’s very tough to get technical funding to develop a new idea, because what we have right now works. What we tried to do in testing was to demonstrate that the rotary valve does work like we said it will.”

For now, he’s also looking at uses for the valve in industrial flow control. ”It might have applications in industry,” Dr. Blackmon said, “if they want a durable valve in the field that’s easy to fix, where you can keep the valve in place while you fix it.”

Jim Steele | Newswise
Further information:
http://www.uah.edu

More articles from Power and Electrical Engineering:

nachricht Fraunhofer Researchers Develop High-Pressure Sensors for Extreme Temperature
28.06.2017 | Fraunhofer-Institut für Zuverlässigkeit und Mikrointegration IZM

nachricht Touch Displays WAY-AX and WAY-DX by WayCon
27.06.2017 | WayCon Positionsmesstechnik GmbH

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Can we see monkeys from space? Emerging technologies to map biodiversity

An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.

Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...

Im Focus: Climate satellite: Tracking methane with robust laser technology

Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.

Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...

Im Focus: How protons move through a fuel cell

Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.

As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...

Im Focus: A unique data centre for cosmological simulations

Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.

With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...

Im Focus: Scientists develop molecular thermometer for contactless measurement using infrared light

Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine

Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Plants are networkers

19.06.2017 | Event News

Digital Survival Training for Executives

13.06.2017 | Event News

Global Learning Council Summit 2017

13.06.2017 | Event News

 
Latest News

Supersensitive through quantum entanglement

28.06.2017 | Physics and Astronomy

X-ray photoelectron spectroscopy under real ambient pressure conditions

28.06.2017 | Physics and Astronomy

Mice provide insight into genetics of autism spectrum disorders

28.06.2017 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>