NASA Tests Engine Technology to Assist With Future Space Vehicle Landings

Jul 01, 2010
Testing of the Common Extensible Cryogenic Engine, also known as CECE, at 100 percent power level. (NASA/PWR)

(PhysOrg.com) -- NASA, in partnership with Pratt & Whitney Rocketdyne (PWR), recently completed the fourth and final series of tests on the Common Extensible Cryogenic Engine (CECE).

Spacecraft attempting to land on an unfamiliar surface need to perform a maneuver called “deep throttling" -- a step that allows the vehicle to precisely throttle down to perform a smooth, controlled landing. NASA, in partnership with Pratt & Whitney Rocketdyne (PWR) headquartered in Canoga Park, Calif., has demonstrated this type of control capability to help design a more reliable and robust descent engine that could be used to land space exploration vehicles on the moon, an asteroid or another planet.

The Common Extensible Cryogenic Engine, also known as CECE, recently completed the fourth and final series of hot-fire tests on a 15,000-pound thrust class cryogenic technology demonstrator rocket engine, increasing the throttling capability by 35 percent over previous tests. This series demonstrated this engine could go from a thrust range of 104 percent power down to 5.9 percent. This equates to an unprecedented 17.6:1 deep-throttling capability, which means this cryogenic engine can throttle up and back down quickly.

Another key objective of this test series and a successful first for this type rocket engine was to test a closed loop control system using a fuel mixture ratio component that controls the amount of liquid oxygen and liquid hydrogen entering the combustion chamber. This system also monitors the combustion chamber pressure feedback during throttling. Precise control of propellant and thrust will reduce the amount of fuel needed to land future space vehicles, reducing launch cost and weight, opening more payload capability.

Landing a space vehicle on an unknown location, can be a little like driving at night where unforeseen challenges present themselves and drivers have to be able to react quickly and accurately to avoid a collision. The same is true for a spacecraft when they come upon a rock or boulder before landing. The spacecraft has to be able to throttle up quickly and accurately to avoid damaging the craft. The CECE team has worked to increase the engine's ability to throttle quickly and precisely to decrease the risks associated with landing humans and expensive space hardware.

"An outstanding team of NASA and Pratt & Whitney Rocketdyne engineers worked diligently to get us to this milestone," said Tony Kim, Deep Throttling Engine Technology Development manager at NASA's Marshall Space Flight Center in Huntsville, Ala. "I couldn’t be more pleased with the test results we achieved. Our collaborative teaming environment allowed our members to stretch the boundaries of engine operations.”

NASA will benefit from the advancements made to this technology, and I’m confident that the cosmos will be opened and available to humanity, in no small part, because of these achievements,” said Frank Peri, director of the Exploration Technology Development Program at NASA’s Langley Research Center, in Hampton, Va.

The total test time for the technology demonstration 1.7 test series was 2,403 seconds, which, when combined with the previous three test series, brings the program’s total engine test time to 7,436 seconds, or 124 minutes, providing a large amount of test data to quantify CECE performance and capability. All of the tests were conducted at a NASA owned; Pratt & Whitney Rocketdyne’s operated facility in West Palm Beach, Fla.

The CECE is based on the existing Pratt & Whitney Rocketdyne RL10 upper stage rocket engine. The previous RL10 track record as well as the recent technology demonstrations provides confidence and buys down risk for a possible future throttling engine development to support space exploration. The test data will allow engineers to develop simulation models to help predict engine behavior based on design parameters.

The CECE collaboration includes engineers from Marshall, NASA's Glenn Research Center in Cleveland, and Pratt & Whitney Rocketdyne. has invested in CECE technology since 2005 as part of the Propulsion and Cryogenics Advanced Development project at Glenn. The project is funded by the Exploration Technology Development Program in NASA's Exploration Systems Mission Directorate.

Explore further: Obama salutes 45th anniversary of US astronauts' Moon landing

add to favorites email to friend print save as pdf

Related Stories

Throttling Back to the Moon

Jul 17, 2007

Accelerating from 0 to 60 then slowing down for a stop light is no problem for an ordinary automobile. But if you were piloting a rocketship, it wouldn't be so easy. Most rocket engines are designed to burn ...

Recommended for you

Heat testing the miniature Aausat 4 satellite

4 hours ago

The miniature Aausat satellite undergoes repeated temperature variations in a vacuum chamber, cooling the CubeSat to –10°C and heating it to +45°C for more than two weeks. This harsh baptism will make ...

New meteor shower "just a memory" of what once was there

4 hours ago

The weak display of last month's Camelopardalids meteor shower, the result of the close passage of comet 209P/LINEAR, may have disappointed backyard observers, but this never-before-seen shower now has scientists ...

New launch date set for ISS delivery vessel

21 hours ago

A robot ship will be launched from Kourou, French Guiana, after a five-day delay on July 29 to deliver provisions to the International Space Station, space transport firm Arianespace said Tuesday.

The heart of an astronaut, five years on

22 hours ago

The heart of an astronaut is a much-studied thing. Scientists have analyzed its blood flow, rhythms, atrophy and, through journal studies, even matters of the heart. But for the first time, researchers are ...

User comments : 0