• Title/Summary/Keyword: 연소 상태

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A Study on the Nondestructive Test Method for Adhesively Bonded Joint in Motor Case Assembly (연소관 조립체의 접착 체결부에 대한 비파괴 시험 방법 연구)

  • Hwang, Tae-Kyung;Lee, Sang-Ho;Kim, Dong-Ryun;Moon, Soon-Il
    • Journal of the Korean Society for Nondestructive Testing
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    • v.26 no.5
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    • pp.343-352
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    • 2006
  • In the present paper, the nondestructive test method was suggest to establish the bonding status of a motor case assembly composed of a steel motor case, adiabatic rubber layer and an ablative composite tube with strain data, AE(acoustic emission) signals and UT(ultrasonic test) data. And, finite element analysis was conducted to verify quantitatively the bonding status of motor case assembly under inner pressure loading. The bonding status could be judged whether the bonding status is perfect or contact condition by the data correlation study with AE signals and strain data measured from air pressure test. And, to classify the bonding status of motor case and rubber layer among bonding layers, UT method was also applied. From this study, the bonding status could be classified and detected into fourth types for all bonding layers as follows: (1) initial un-bonding, (2) perfect do-bonding during an air pressure test, (3) partially de-bonding during an air pressure test, and (4) perfect bonding.

KM 복합재 연소관의 구조적 건전성 평가

  • 윤성철
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2000.04a
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    • pp.23-23
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    • 2000
  • 고체 추진기관의 연소관은 높은 열과 압력 상태에서 작동하며, 따라서 연소관이 임무 수행중 구조적 건전성을 유지할 수 있는가를 실험적, 해석적 방법 등을 통하여 확인할 필요가 있다. 일반적으로 이론적 해석을 통해 엄밀해를 얻거나 수치 해석적 방법을 사용하여 근사적 해를 구하고, 실험결과와 비교함으로써 연소관의 구조적 건전성을 평가한다.

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Generation and fluorescence measurement of HF* molecules excited by combustion of fluorine and hydrogen (불소-수소 연소 열을 이용한 들뜬 상태 HF* 분자의 생산 및 형광 측정)

  • 최윤동;권성옥;김택숙;김성훈;김응호;김철중
    • Korean Journal of Optics and Photonics
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    • v.12 no.3
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    • pp.153-157
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    • 2001
  • Operation conditions for the generation of an HF laser driven by fluorine-hydrogen combustion were discussed by mc:asuring the intensities of excited HF* molecules. Optimum injection quantities of fluorine gas for the generation of fluorine atoms was two times the injection mole number of hydrogen fuel. Slit nozzles with two dimensional configuration were used for the production of excited HF* molecules. When the injection mole number of secondary hydrogen gas is 1.3 times the injection mole number of fluorine gas, the fluorescence intensities of excited HF* molecules show maximum values. alues.

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Rocket Ignition at low Pressure (저압상태에서 점화현상 연구)

  • Gil Hyun-Yong;Choi Chang-Sun;Cha Hong-Suk
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2005.11a
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    • pp.433-436
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    • 2005
  • The combustion behavior of initiators and can-type ignitor, acting on vacuum pressure, was invested. It was found that if the ignited propellants of a can-type igniter were exposed at certain level of low pressure, it would be burnt improperly or even be extinguished. When we design the can-type igniters for some rocket motor, it is most important that the pressure built-up by the gases which were already burnt inside of the igniter case keep as high as possible. For this purpose, it is recommended that the ignitor case have some strength to produce as much gases as possible before breaking out and the free volume be kept as small as possible.

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Hot-Fire Test and Performance Evaluation of Small Liquid-Monopropellant Thrusters under a Vacuum Environment (단일액체추진제 소형 추력기의 진공환경 연소시험 및 성능특성 평가)

  • Kim Jeong Soo
    • Journal of the Korean Society of Propulsion Engineers
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    • v.8 no.4
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    • pp.84-90
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    • 2004
  • A performance evaluation is made in terms of thrust, impulse bit. and specific impulses for a set of mono-propellant hydrazine thrusters producing 0.95 lbf of nominal thrust at an inlet pressure of 350 psia. With a brief description on the hot-firing test configuration and procedures. a typical data obtained from steady-state firing mode is given directly showing the variational behavior of propellant supply pressure, mass flow rate, vacuum condition, and thrust. The performance features are successfully compared to the reference criteria of 1-lbf standard mono-propellant rocket engine. Additionally. a statistical inter-thruster treatment is concisely depicted for the justification of selected thrusters as a grouped member of flight model for spacecraft propulsion system.

A Study on the Smoldering hazard of Rice bran dust. (쌀겨 분진의 훈소 위험성에 관한 연구)

  • 이창우;김정환;현성호
    • Fire Science and Engineering
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    • v.13 no.2
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    • pp.12-17
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    • 1999
  • We intended to investigate combustion properties of rice bran dust. Combustion properties of h rice bran dust according to size distribution and amount were measured as temperature v variation with time using spontaneous ignition apparatus. Moreover, combustion properties w with blowing or without blowing condition were checked in order to investigate combustion p properties in spontaneous ignition apparatus according to flow condition of air. A As the mass and size of rice bran dust was increased, i띠ti외 smoldering temperature was l lowered. All of combustion forms were smoldering combustion. Initial smold얹ing temperature w was slightly lower with blowing condition than without blowing condition in spontaneous i ignition apparatus, which condition made heating value high.

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Steady-state Thrust Characteristics of Hydrazine Thruster for Attitude Control of Space Launch Vehicles (우주발사체 자세제어용 하이드라진 추력기의 정상상태 추력 특성)

  • Kim, Jong Hyun;Jung, Hun;Kim, Jeong Soo
    • Journal of the Korean Society of Propulsion Engineers
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    • v.16 no.6
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    • pp.48-55
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    • 2012
  • An ambient hot-firing test was carried out for the hydrazine thruster which may be employed in the space launch vehicles. The thruster is designed to produce 67 N (15 $lb_f$) of nominal steady-state thrust at an inlet pressure of 2.41 MPa (350 psia). A scrutiny into the performance characteristics of thruster is made in terms of thrust, propellant supply pressure, mass flow rate, chamber pressure, and temperature at the steady-state firing mode. As a result, it is ensured that the practical performance efficiencies are above 89.1% compared to its ideal requirements.

A Study on Combustion Characteristics of Starch (전분 분진의 연소특성에 관한 연구)

  • 김정환;현성호;이창우
    • Fire Science and Engineering
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    • v.15 no.2
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    • pp.1-5
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    • 2001
  • We had investigated combustion properties of starch. Decomposition of starch scavenged by pre-cipitator of spinning factory with temperature were investigated using DSC and TGA. Combustion properties of starch according to amount were checked as temperature variation according to time using spontaneous ignition apparatus. Moreover, combustion properties with blowing or without blowing condition were checked in spontaneous ignition apparatus. As results of thermal analyses, increase in raising temperature causes initial smoldering temperature to move towards low temperature section. In addition, as amount of starch was increased, initial smoldering temperature was lowered. All of combustion forms were smoldering combustion. Initial smoldering temperature was low more slightly with blowing condition than without blowing condition in spontaneous ignition apparatus, which condition made heating value high.

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A Study on Anti-oxidization Coating for Staged Combustion Cycle Rocket Engines (다단연소 사이클 엔진 적용을 위한 내산화 코팅에 관한 연구)

  • Kim, Young-June;Rhee, Byong-ho;Noh, Yong-Oh;Bae, Byung-Hyun;Hyun, Seong-Yoon;Cho, Hwang-Rae;Bang, Jeong-Suk;Byon, Eung-Sun;Han, Yeoung-Min
    • Journal of the Korean Society of Propulsion Engineers
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    • v.22 no.5
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    • pp.125-131
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    • 2018
  • Some propellants in a liquid rocket engine are burned in the pre-burner of a staged combustion cycle engine, resulting hot gas drives the turbine. The burned gas passing through the turbine is supplied to the combustor at high temperature and pressure. The form of the gas can be fuel rich or oxidizer rich dependent upon the mixture ratio or the engine scheme. When the cycle works at oxidizer-rich condition, the metal pipes composing the engine can be ignited or even exploded by an impact of very a small particle. In this study, we developed the powder combination and processes for an anti-oxidation coating through the analysis of various coating materials.

壓縮點火機關의 燃燒室 特性과 狀態變化(II)

  • 김광수
    • Journal of the KSME
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    • v.24 no.1
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    • pp.28-34
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    • 1984
  • 연소실의 특성에서 알 수 있는 것처럼 공기유동의 영향이 연소에 미치는 영향이 크기 때문에 본고에서는 난류에 대해서 살펴보고, 또한 실린더내의 상태변화에 대해 알아보았다.

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