• Title/Summary/Keyword: 알루미늄-물 연소

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Combustion Characteristics of Al powder with Water Suspension (Al 분말과 Water 혼합물의 연소특성 연구)

  • Ki, Wan-Do;Kim, Kwang-Yeon;Shmelev, Vladimir;Cho, Yong-Ho
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2012.05a
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    • pp.157-162
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    • 2012
  • The basic study for combustion characteristics of micron-sized aluminum powder with water suspension was carried out. Under atmospheric pressure, the combustion characteristics of aluminum powder with water suspension was studied by adjust the equivalent ratio and the density of a mixture which effect on burning rate. Based on atmospheric pressure's result, the device for the combustion characteristics of aluminum powder with water suspension under high-pressure environment was developed. In the pressure range from 2 to 50 atm the effect of pressure to burning rate was same as the case of nano-aluminum with water suspension, but the pressure range from 50 to 70 atm the sharp increase in burning rate was observed. In the experiment of varying the equivalence ratio, the combustion did not proceed in the condition of excess oxidizer (eq = 1.5).

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Combustion modeling of nano aluminum particle and water mixture (나노 알루미늄-물 혼합물의 수반응 연소 모델링)

  • Yoon, Shi-Kyung;Sung, Hong-Gye
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2010.05a
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    • pp.472-475
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    • 2010
  • Theoretical consideration on the combustion behavior of nano-aluminum and water mixture was conducted. The regions are divided into; 1)water+aluminum 2)steam+aluminum 3)reaction zone. Latent heat of vaporization was considered as a function of pressure in case of phase change of water. Also, pressure exponent was studied of various sized nano particles within the range of 0.1MPa ~ 10MPa.

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Development of combustion test device for study of aluminum powder combustion (알루미늄 분말 연소시험을 위한 장치 개발)

  • Hwang, Yong-Seok;Lee, Ji-Hyung;Lee, Kyung-Hun;Kim, Kwang-Yun;Lee, Sung-Woong;Yeo, Tae-Min
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2011.11a
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    • pp.548-553
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    • 2011
  • The device for studying combustion characteristic of aluminum powder and water was developed. The device has ability to adjust temperature, pressure, and equivalent ratio to some specified value which effect on combustion characteristic of aluminum and water mixture. Methane combustor, water supply device, aluminum powder feeder, and linear combustor are assembled to aluminum combustion test device. Each device has the ability to supply matter to combustor on steady and quantitatively controlled manner and test sequence specified by user can be automatically controlled. The combustion of aluminum powder was observed when integrated device was operated normally.

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Combustion of Nano-scale Aluminum and Liquid Water for Pressure Sensitivity (물을 산화제로 하는 나노 알루미늄 분말 연소의 압력 민감도 실험)

  • Lee, Sang-Hyup;Lim, Ji-Hwan;Yoon, Woong-Sup
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2010.05a
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    • pp.476-482
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    • 2010
  • 알루미늄은 많은 이점에도 불구하고 표면의 높은 용융점을 가지는 산화 피막 효과로 인해 원활하게 점화와 연소 반응이 일어나지 못하는 단점이 있다. 그런데 산화피막을 제거하는 방법은 매우 복잡하며 용이하지 않으므로 본 연구에서는 연소율은 압력에 비례한다는 원리를 이용하여 접근하였다. 연소 속도의 압력에 따른 민감도를 알기 위해 압력 용기를 설계하였고 아르곤 가스를 이용하여 80nm의 알루미늄 분말과 산화제인 증류수의 혼합물을 3, 5, 10 기압의 압력 조건에 따른 연소속도의 변화를 측정하고 해외의 연구와 비교 분석하였다.

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Study of two phase flow and erosion characteristic in SRM nozzle (고체 추진제 로켓 노즐 내부의 2상 유동 및 마모 특성에 관한 연구)

  • 김완식;조형희;배주찬
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 1998.10a
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    • pp.32-32
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    • 1998
  • 고체 추진제 로켓의 연소시에 발생되는 산화 알루미늄(A1$_2$O$_3$) 입자는 로켓 추진 노즐에서 팽창과정의 효율을 저하시키는 요소가 되며, 이러한 비효율성은 연소 가스와 입자간의 비평형 상태 효과와 기본적인 속도와 열적 차이에 의해서 발생된다고 보고되었다. 또한 연소시 발생된 산화 알루미늄 입자는 높은 열과 큰 운동량을 가지고 로켓 노즐 내부를 유동하게 되며, 매우 많은 량이 짧은 시간에 고온 고속으로 노즐 벽면이나 기타 구조물에 충돌 및 점착하기 때문에 로켓 노즐내의 표면이 손상을 입게 되고, 로켓의 방향 제어 및 조정 안정성이 저하되며, 구조적인 강도가 약화 될 수 있다. 또한 산화 알루미늄 액적들의 경우 노즐 벽면에 고착되게 되면 로켓의 중량 증가로 인해서 추력의 손실을 초래할 수 있다. 따라서 이러한 연소 부산물들의 운동 경로와 충돌 위치 및 표면에서의 충돌량과 그리고 충돌에 따른 마모량 및 점착 그리고 열전달 특성을 예측하는 것이 필수적이다.

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Study on combustion characteristics of seawater-reactive solid propellant for underwater propulsion (수중추진을 위한 해수반응성 고체추진제의 연소특성에 관한 연구)

  • Park, Kilsu;Kim, Taegyu
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2017.05a
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    • pp.128-130
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    • 2017
  • $NaBH_4$ was added to improve the water reactivity of aluminum powder as a solid propellant for underwater propulsion. Aluminum powders showed different combustion characteristics depending on the amount of $NaBH_4$ added. When $NaBH_4$ was added, it was burned by reaction with water even at a temperature much lower than the boiling point. In this study, it was confirmed that $NaBH_4$ is an effective additive to accelerate the vapor reaction with Al powder.

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Slagging Effect of Combustion Gas containing Sulfur on Refractories (내화물에 대한 황함유 연소가스의 영향)

  • 임응극;이영희
    • Journal of the Korean Ceramic Society
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    • v.11 no.4
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    • pp.5-18
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    • 1974
  • 본 연구에 있어서는 연료유의 연소에 의한 내화물의 부식을 연구하기 위하여 시멘트소성용 회전가마, 보일러 및 판유리제조용 탱크가마에 쓰이는 여러 내화물을 짤라서 그 가운데에 구멍을 파고 중유재의 주성분인 V2O5, Na2CO3, Fe2O3, Fe 및 황산철을 미리 그 구멍속에 넣어 응용 확산시킨 다음 이들을 그들의 상용온도인 145$0^{\circ}C$로 황 함유량이 다른 연류유로 소성하여 얻은 결과는 다음과 같다. 일반적으로 5산화 바나듐-알루미나, 고알루미나질 및 염기성 내화물; 산화나트륨-고알루미나질, 실리마나이트질 및 염기성 내화물은 2%미만의 황 함유 연류유소성에 의하여 부식이 적고 3.5%이상의 황하유 연료유소성시는 황에 의하여 대개가 침식을 당하였다. 무수 아황산 분위기속에서 규산알루미늄 및 구석계의 내화점토질내화물은 산화철이 환원되어 색이 연해지고 고알루미나질 벽돌은 색이 짙어지는 경향이 있고 산화철은 황산철로 변하여 풍화의 원인이 되어 침식을 당하게 되었고, 소성시간이 길면 길수록 부식은 증가하고 황산소다보다 탄산소다에 의하여 훨씬 더 많이 부식을 당하였다.

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Conceptual Design of the Slag Removal Method in the Metal Powder Combustor and Condition Tests for the Water Film Formation (금속분말 연소기의 slag 제거기법 개념 설계 및 Water Film 형성 조건 기초실험)

  • Kim, Kwang-Yeon;Shmelev, V.;Ko, Hyun;Lee, Sung-Woong;Cho, Yong-Ho
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2011.11a
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    • pp.554-557
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    • 2011
  • One of the issues that occurs in development of a combustor using Metal Powder as a fuel is an alumina slag processing. A water film formed inside the combustor is expected to be able to solve this issue. The experiments about the formation of a water film were carried out as a preliminary study. As the tangential velocity of water jet is increasing, the angle derivation from horizontal is decreasing for the test model. Results of the experiments showed that the thin water film on the inner surface appeared at the velocity of 10~15 m/s.

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Combustion Characteristics of HTPB/AP/Zr Propellant (HTPB/AP/Zr 추진제의 연소 특성)

  • Min Byoung-Sun;Hyun Hyung-Soo;Yim Yoo-Jin
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • v.y2005m4
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    • pp.61-65
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    • 2005
  • In HTPB/AP propellants, zirconium(Zr) addition to formulation was shown to be less specific impulse than aluminum(Al) by the theoretical calculation because of the lower flame temperature and higher molecular weight of Zr oxide. It was found that the burning rate was faster with the finer size of Zr and the more content of $2{\mu}m$ Zr the faster burning rate is in HTPB/AP/Zr propellants caused by the more conduction energy transfer from Zr flame to the burning surface. Also the burning rate of HTPB/AP/Zr propellant could be reduced by addition of 150nm Al, depending on AP size distribution in formulation with Butacene and $1{\mu}m$ AP.

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Combustion Characteristics of HTPB/AP/Zr Propellant (HTPB/AP/Zr 추진제의 연소 특성)

  • Min Byoung-Sun;Hyun Hyung-Soo;Yim Yoo-Jin
    • Journal of the Korean Society of Propulsion Engineers
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    • v.9 no.2
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    • pp.9-16
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    • 2005
  • Zirconium(Zr) addition to formulation of HTPB/AP propellants, was shown to be less specific impulse than aluminum(Al) by the theoretical calculation because of the lower flame temperature and higher molecular weight of Zr oxide. It was found that the burning rate was faster with the finer size of Zr and the more content of $2{\mu}m$ Zr the faster burning rate is in HTPB/AP/Zr propellants caused by the more conduction energy transfer from Zr flame to the burning surface. Also the burning rate of HTPB/AP/Zr propellant could be reduced by addition of 150nm Al, depending on AP size distribution in formulation with Butacene and $1{\mu}m$ AP.