• Title/Summary/Keyword: 단기추진제

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다목적실용위성 추진시스템의 추진제 소모율 분석

  • 김정수;한조영
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2000.11a
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    • pp.8-8
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    • 2000
  • 하이드라진 단기액체엔진을 장착하고 궤도에서 임무를 수행하고 있는 다목적실용 위성 추진시스템 궤도비행 초기운용 자료에 근거하여 추진제 소모율을 산정 한다. 추진시스템은 위성의 궤도각과 비행고도 조정을 위한 속도증분($\Delta$V) 및 자세제어를 위한 추력을 발생시킨다. 단기액체 추진시스템에서 추진제 소모량은 추력기 밸브의 개폐시간에 비례하고 추력 생성 효율은 추진제의 연소기 유입압력에 종속한다. 일정질량의 가압 기체 압력에 의해 연료를 공급하는 추진시스템에서 잔류 추진제 량의 감소는 연소기 유입압력의 감소를 유발하고 추진기관의 효율을 저하시키는 요인으로 작용하여 임무말기로 진행함에 따라 동일한 운동량 생성에 보다 많은 연료소모가 이루어진다.(중략)

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A Study on Characteristics of Single Base Propellants by the Content Variation of NGD (II) (NGD 함량에 따른 단기 추진제 특성 연구 II)

  • Oh, Minseok;Jang, Jungeun;Joo, Hyeong-uk;Kwon, Tae soo
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2017.05a
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    • pp.968-971
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    • 2017
  • In this study, manufacturing the Single Base propellant using a Nitroguanidine(NGD A%, NGD-B%, 2A=B). The Factors affecting the combustion rate are Moisture and Volatiles, Residual Solvents, Dimension. These Factors were analyzed and compared. Also, NGD-A% propellants and NGD-B% propellants were compared with firing test Test. As a result, NGD-A% was confirmed to have a higher speed at a similar pressure than NGD-B% propellants.

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The Shelf-life Prediction of Single-Base Propellants by applying the Kinetic Model of n-th Order (n차 반응속도 모델을 적용한 단기추진제의 저장수명 예측)

  • Lee, Sang-Bong;Seo, Jung-Wha;Choi, Kyeong-Su;Kim, Sung-Bok
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.5
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    • pp.3633-3642
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    • 2015
  • Single-base propellants contain a single energetic component: nitrocellulose. Accurate predictions of propellant shelf-life should result in cost savings in terms of human and material resources. This study derived an optimized kinetic model reaction order that described stabilizer consumption and estimated propellant shelf-life. High temperature accelerated aging tests gave an optimum reaction order value of 1.15481, from which the minimum standard error of a linear regression estimate of 16.284 was obtained. At normal storage temperature of $21-30^{\circ}C$, propellants should have a safe shelf-life of 140 years, and a minimum of 35 years. It is necessary to consider the temperature range in ammunition storage areas to predict propellant shelf-life more accurately.

위성 추진시스템의 추력제어밸브 작동에 따른 추진제 비정상 유동 특성

  • Kim, Jeong-Soo;Han, Cho-Young;Lee, Kyun-Ho
    • Aerospace Engineering and Technology
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    • v.1 no.2
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    • pp.51-56
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    • 2002
  • Satellite propulsion system is employed for orbit transfer, orbit correction, and attitude control. The monopropellant feeding system in the low-earth-orbit satellite blowdowns fuel to the thrust chamber. The thrust produced by the thruster depends on fuel amount flowed into the combustion chamber. If the thruster valve be given on-off signal from on-board commander in the satellite, valve will be opened or closed. When the thrusters fire fuel flows through opened thruster valve, instantaneous stoppage of flow in according to valve actuation produces transient pressure due to pressure wave. This paper describes transient pressure predictions of the KOMPSAT-2 propulsion system resulting from latching valve and thrust control valve operations. The time-dependent set of the fluid mass and momentum equations are calculated by MOC.

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A study on the self-life estimation of the propellant KM10 by using high temperature acceleration aging tests (고온가속노화시험을 이용한 추진제 KM10의 저장 수명 추정)

  • Cho, Ki-Hong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.5
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    • pp.1735-1740
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    • 2010
  • The propellant KM10, a single propellant manufactured nitrocellulose, is known to cause natural degradation phenomena at long term storage. The self-life was estimated using generally used high temperature acceleration aging tests to analyze the content of stabilizer and using the Arrhenius equation & Berthelot equation to calculate reaction rate constants. According to the result of this study, self-life of propellant KM10 using the Arrhenius equation & Berthelot equation appear significantly different as 43.73, 16.53years and when compared with the paper of E. R. Bixon, self-life of propellant KM10 predicted using the Arrhenius equation was reasonably determined.

저출산.고령사회에 대비한 국가실천전략

  • 김용익
    • Proceedings of the Korean Society of Health Policy and Administration Conference
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    • 2004.05a
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    • pp.3-11
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    • 2004
  • Ⅰ. 국가실천전략을 위한 정책추진배경 및 방향·방향 1. 삶의 질 개선과 국가경쟁력 제고·새로운 산업, 고용정책 추진, 사회안전망의 내실화를 통한 삶의 질 개선 ■ 인적자원의 확충과 효율적 관리를 통한 성장동력 확보, 국가경쟁력 제고 □ 방향 2. 장기적·종합적 정책 수립 ■ 중장기적 관점에서 큰 틀의 방향 설정 ■ 이에 맞춰 단기대잭 조율 □ 방향 3. 국민의 참여와 범정부적 정책추진 ■ 인구, 경제, 고용, 교육, 여성, 보육, 보건, 복지, 여가, 문화 등의 여러 분야에서의 국민참여를 통한 국민을 위한 정책 개발 ■ 범정부적 정책으로 유도정부의 정책방향과 미래사회 준비에 합치되는 범정부적 정책으로 유도 (중략)

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The Effect of Stabilizer(DPA, $CaCO_3$) Addition on the Shelf Life of the Single Base Propellant (단기추진제 저장수명에 미치는 안정제(DPA, $CaCO_3$) 첨가의 효과)

  • 윤근식;고석일;유승곤
    • Journal of the Korea Institute of Military Science and Technology
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    • v.6 no.2
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    • pp.9-19
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    • 2003
  • Nitrogen oxide gases which were produced by spontaneous reaction of nitrocellulose(NC) in the single base propellant accelerate the decomposition of propellant, and result in the reduction of shelf life. The amount of nitrogen oxide was reduced by the addition of 0.3wt% $CaCO_3$ to conventional stabilizer(DPA) and down of the solvent leaching temperature from $64^{\circ}C$ to $56^{\circ}C$, which extended the shelf life of the single base propellant as much as twice compare with commercial propellant. The perforation diameter increase of propellant from 0.64mm to 0.77mm could compensate for the drop of burning rate which was caused the addition of $CaCO_3$.

Research on the Storage Life of Single Base Propellant by Adding Inorganic Stabilizer $CaCO_3$ (무기 안정제 $CaCO_3$ 첨가에 따른 단기 추진제의 저장 수명에 관한 연구)

  • Chang, Il-Ho;Cho, Ki-Hong
    • Journal of the Korea Institute of Military Science and Technology
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    • v.10 no.3
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    • pp.200-207
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    • 2007
  • Single base propellant using a nitrate ester compound NC decomposes naturally during storage time. Therefore, the research for storage life extension is necessary to single base propellant. In this research, $CaCO_3$ inorganic stabilizer had been added into single base propellants up to 0.3%, and the accelerated aging test of the propellant was started. And then, with applying the Arrhenius equation, the storage life of the test of the propellant was contrasted with that of reference propellant. As a result, the storage life of the propellant containing $CaCO_3$ inorganic stabilizer was about twice longer than the reference propellant.

Life Expectancy Estimation of the Propellants KM10 using High Temperature Acceleration Aging Tests and Stockpile Analysis Test (고온가속노화시험법과 저장분석시험법을 이용한 추진제 KM10의 기대수명 평가)

  • Cho, Ki-Hong;Kim, Eui Yong
    • Korean Chemical Engineering Research
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    • v.48 no.6
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    • pp.695-699
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    • 2010
  • The propellant KM10, a single propellant manufactured from nitrocellulose, was known to cause natural degradation phenomena at long term storage. In this study, the self-life was estimated using high temperature acceleration aging tests and stockpile analysis test. For the life expectancy estimation, Arrhenius equation and Berthelot equation were used in the high temperature acceleration tests, and the first order regression was used in the Stockpile analysis test. The self-life of propellant KM10 using the Arrhenius equation and Berthelot equation showed significantly different results as 43.73, 16.53 years in the high temperature acceleration test, and it showed 42.94 years in the Stockpile analysis test. The value of self-life predicted by Arrhenius equation was reasonable when compared with the result of E. R. Bixon.

The Study for the Single-based Propellant Shelf Life extension (단기추진제 저장수명 연장을 위한 방안 연구)

  • Bong, Ha-Gyu;Yoon, Keun-Sig
    • Journal of Applied Reliability
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    • v.5 no.3
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    • pp.357-371
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    • 2005
  • Nitrogen oxide gases which were produced by spontaneous reaction of nitrocellulose (NC) in the single base propellant accelerate the decomposition of propellant, and result in the reduction of shelf life, The amount of nitrogen oxide was reduced by the addition of $0.3wt\%$ CaCO3 to conventional stabilizer(DPA) which extended the shelf life of the single base propellant as much as twice compared with commercial propellant.

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