국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Application of the NEXT Ion Thruster Lifetime Assessment to Thruster Throttling
저자	VanNoord, Jonathan L.;; Herman, Daniel A.
Keyword	CHARGE EXCHANGE;; FAILURE MODES;; GROOVES;; HIGH IMPULSE;; ION ENGINES;; LOW THRUST;; ROCKET THRUST;; SPECIFIC IMPULSE;; THROTTLING;; WALLS
URL	http://hdl.handle.net/2060/20110000535
보고서번호	NASA/TM-2010-216920
발행년도	2010
출처	NTRS (NASA Technical Report Server)
ABSTRACT	Ion thrusters are low thrust, high specific impulse devices with typical operational lifetimes of 10,000 to 30,000 hr over a range of throttling conditions. The NEXT ion thruster is the latest generation of ion thrusters under development. The NEXT ion thruster currently has a qualification level propellant throughput requirement of 450 kg of xenon, which corresponds to roughly 22,000 hr of operation at the highest input power throttling point. This paper will provide a brief review the previous life assessment predictions for various throttling conditions. A further assessment will be presented examining the anticipated accelerator grid hole wall erosion and related electron backstreaming limit. The continued assessment of the NEXT ion thruster indicates that the first failure mode across the throttling range is expected to be in excess of 36,000 hr of operation from charge exchange induced groove erosion. It is at this duration that the groove is predicted to penetrate the accelerator grid possibly resulting in structural failure. Based on these lifetime and mission assessments, a throttling approach is presented for the Long Duration Test to demonstrate NEXT thruster lifetime and validate modeling.