Electric Propulsion Electric Propulsion 3 Propulsion Propulsion Reference
- Slides: 22
목차 Electric Propulsion 의 개요(이론) Electric Propulsion의 종류 3가지 영역별 Propulsion의 개요 영역별 Propulsion의 특징 Reference
Chemical Propulsion과 Electric Propulsion의 비교 Elec. Che. Isp 높음 낮음 공간효 높음 율 Ve 낮음 낮음 T/w 낮음 높음 높음
Electric Propulsion의 종류 Electrothermal -Arcjet -Resistojet -MICROWAVE ELECTROTHERMAL THRUSTER (MET) Electrostatic -Ion -Hall Thruster Electrodynamic -MPD(magneto-plasma-dynamic) -Hall-effect -Helicon
ARC Jet 을 위한 가정(Ue고려) 가정 1. high temp& pressure. and conventional nozzle 가정 2. perfect gas and isentropic <옆의 그림 Pulsed Arcjet >
DC ARCJET 2 연료의 선택(page 678) 및 수명 -1. Hydrogen 2. Ammonia 3. Hydrazine -수명은 nozzle 전달되는 열에 의해 파괴될 때 구성
Resistojet 2 기술적 관점 -고온에서의 추진체/제질 -heat transfer 와 radiation lose
Microwave Electrothermal Thruster (MET) 기본원리 1. Micro Application 에 서 Microwave 가 방출 2. Window 표면 가열 3. 회전 Flow 와 결합 중 성 원자들 가열 4. Discharge 되어 노즐 로 분출
Microwave ARCJET 이점 - 전극판 설치 필요 없음 - 자세제어를 위한 Thruster와 Thruster for steady state의 수명강화
Electrostatic Ion Thruster Hall Thruster -STP(Stationary Plasma Thruster), TAL
Ion Thruster 이득: With high Specific impulse (2, 500~10, 000 lbf -s/lbm) and efficiency(50~75%), low cost , faster planet mission possible 단점: with high power requirements and long service life requirement, complex power system
Electron Bombardment Ion Thruster 구조위치 1. Propellant feed 2. Hollow Cathode for discharge Chamber 3. electron feed 4. keeper electrode
STP( Stationary Plasma Thruster) Radial magnetic field 에서 주요한 방전 부분의 고리를 통해서 Thruster를 얻는다. Using DC power Supply and discharge current Cylindrical geometry of SPT that this drift is in azimuthally direction.
Reference http: //entrenet. com/~stevend/ http: //sec 353. jpl. nasa. gov/apc/Electric http: //www. dieselnet. com/news/9901 lmco 2. html http: //trajectory. lerc. nasa. gov/aig 7820/projects/electric/inde x. html http: //www. sae. org/products/standards/J 1317_198206. htm http: //science. nasa. gov/newhome/headlines/prop 06 apr 99_2. htm http: //www. engin. umich. edu/dept/aero/spacelab/ Mechanics And Thermodynamics of Propulsion. -Addison-wesley publishing company. -Philip G. Hill, Carl R. Peterson
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