Predicting Hall Thruster Operational Lifetime Using a Kinetic Plasma Model and a Molecular Dynamics Simulation Method

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$99,912.00
Award Year:
2011
Program:
SBIR
Phase:
Phase I
Contract:
NNX11CE23P
Award Id:
n/a
Agency Tracking Number:
104730
Solicitation Year:
2010
Solicitation Topic Code:
S3.04
Solicitation Number:
n/a
Small Business Information
5621 Arapahoe Ave, Boulder, CO, 80303-1379
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
806486692
Principal Investigator:
YongjunChoi
Principal Investigator
(303) 996-7522
yjchoi@txcorp.com
Business Contact:
LeslieRosczyk
Business Official
(720) 974-1855
lwr@txcorp.com
Research Institute:
Stub




Abstract
Hall thrusters are being considered for many space missions because their high specific impulse delivers a larger payload mass fraction than chemical rockets. With a low thrust, however, Hall thrusters need to operate for a long period of time to achieve the necessary velocity of the mission. For these missions, the lifetime requirements can reach into tens of thousands of hours. For Hall thrusters, the most important life-limiting process is the erosion of the channel walls. However, experimental verification of lifetime is time-consuming and expensive. Therefore, computational method is a useful tool to predict thruster lifetime. Many of the Hall thruster lifetime models were developed, and some of theses models gave quite promising results. However, while qualitatively interesting, the results did not match well with experiment. The reason of this discrepancy is that these numerical models assume electrons as a fluid. The proposed innovation will provide a better understanding of the erosion physics and will be useful for future Hall thruster development, such as HiVHAc, with low cost and time. This tool also will allow to aid in the acceptance and implementation of Hall thrusters as a primary propulsion device through improving confidence of their long term reliability.

* information listed above is at the time of submission.

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