• Title/Summary/Keyword: 연소안정성 시험평가

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Fire test procedures for flammability of bulkhead, ceiling and deck finish materials (선박의 격벽, 천정, 내장재 및 표면바닥재의 화재안정성 평가방법)

  • Kim, S.Y.;Kim, D.S.;Ahn, B.H.;No, H.S.
    • Proceedings of KOSOMES biannual meeting
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    • 2007.05a
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    • pp.157-159
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    • 2007
  • It is very important to protect life, property at sea from any fire. Recommendation on improved fire test procedures for surface flammability of bulkhead ceiling and deck finish materials specifies a procedure for measuring fire characterizing their flammability and thus their suitability for use in marine construction. In this paper we investigated the positive expected by fire test procedures for flammability of bulkhead ceiling and deck finish materials. Also, unusual materials were analyzed. Finally, we suggest methods to solve several problems related to unusual materials.

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Study of High Altitude Operation for Air Swirl Injector in Tangential Swirl Combustor (Tangential Swirl 연소기에 적용된 스월인젝터의 고고도 운전성능 연구)

  • Park, Hee-Ho;Ryu, Se-Hyun;Koo, Hyun-Cheol;Lee, Seong-Jun
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2010.11a
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    • pp.825-828
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    • 2010
  • APU for aircraft is operated under severe condition as high altitude and low temperature, and demand high reliability in flight. This study is to be verified of the ignition and the combustion stability of APU under the harsh conditions. The basic data obtained in combustion rig test were directly applied to the altitude test with a engine. That start logic was obtained in ground development test. The results of altitude test show that air swirl injector has good operation and ignition performance at 20kft, hot/cold($-40^{\circ}C$) day.

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Research on substitution test for Flight test of BBU (항력감소제 비행시험 평가 대체기법 연구)

  • Chae, Kyung-Min;Park, Jong-Wan;Kwon, Tag-Man;Whang, Woo-Yeol
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2010.11a
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    • pp.359-362
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    • 2010
  • BBU for 155mm projectile has been verified its stable performance and quality reliability through the production for several years. We have researched substitution test for flight test of BBU. Through this research, we expect the verification of quality stability and other collateral effect like the cost reduction and delivery on time.

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Development of Analysis Code for Evaluation of Acoustic Stability of Rocket Engine Combustor with Various Designs (로켓엔진 연소기 설계의 음향안정성 평가를 위한 해석코드 개발)

  • Kim, Seong-Ku;Kim, Hong-Jip;Sohn, Chae-Hoon
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.32 no.6
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    • pp.110-116
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    • 2004
  • In this study, a three-dimensional finite-element analysis code has been developed to predict acoustic behaviors in rocket combustion chambers and to quantitatively evaluate acoustic stability margins for various designs with passive stabilization devices such as baffle and acoustic resonators. As a validation case, computations are made for combustion chambers with/without a hub-and-six-blade baffle which are developed in the KSR-III Development Program. Compared with experimental results from ambient acoustic test, the numerical approach reasonably well predicts acoustic pressure responses to acoustic oscillation excitation for both unbaffled and baffled combustion chambers and yields quantitatively good agreement for acoustic damping effects of baffle installation in terms of damping factor ratio and resonant frequency shift.

Ignition Test of an Oxidizer Rich Preburner (산화제과잉 예연소기 점화시험)

  • Moon, Il-Yoon;Moon, In-Sang;Yoo, Jae-Han;Jeon, Jae-Hyoung;Lee, Seon-Mi;Hong, Moon-Geun;Ha, Seong-Up;Kang, Sang-Hun;Lee, Soo-Young
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2011.11a
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    • pp.869-872
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    • 2011
  • Ignition tests of an oxidizer rich preburner for a staged combustion cycle liquid rocket engine were performed to evaluate combustion performance. Design operation conditions of the tested oxidizer rich preburner are about 60 of OF ratio and 20 MPa of combustion pressure. The entire kerosene and some LOx injected into the mixing head is burned in combustion chamber and the remaining LOx injected through center holes of combustion chamber is vaporized. Full flow ignition method with hypergolic fuel was used. Each propellant was supplied in two stages for soft ignition. Test results, low frequency oscillation was occurred in low flow rate conditions under 45% of design flow rate. Stable ignition in the course of design combustion pressure was able to induce by minimization of low flow rate ignition region to escape low frequency oscillation.

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Application of Combustion Stabilization Devices to Liquid Rocket Engine (액체 로켓엔진에서 연소 안정화기구의 적용에 관한 연구)

  • Sohn Chae-Hoon;Moon Yoon-Wan;Ryu Chul-Sung;Kim Young-Mog
    • Proceedings of the KSME Conference
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    • 2002.08a
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    • pp.259-262
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    • 2002
  • Application of combustion stabilization devices such as baffle and acoustic cavity to liquid propellant rocket engine is investigated to suppress high-frequency combustion instability, i.e., acoustic instability. First, these damping devices are designed based on linear damping theory. As a principal design parameter, damping factor is considered and calculated numerically in the chambers with various specifications of these devices. Next, the unbaffled chambers with/without acoustic cavities are tested experimentally for several operating conditions. The unbaffled chamber shows the specific stability characteristics depending on the operating condition and has small dynamic stability margin. The most hazardous frequency is clearly identified through Fast Fourier Transform. As a result, the acoustic cavity with the present design has little stabilization effect in this specific chamber. Finally, stability rating tests are conducted with the baffled chamber, where evident combustion stabilization is observed, which indicates sufficient damping effect. Thrust loss caused by baffle installation is about $2{\%}$.

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Fire test procedures for flammability of bulkhead, ceiling and deck finish materials (선박의 격벽, 천정, 내장재 및 표면바닥재의 화재안정성 평가방법)

  • Kim, S.Y.;Kim, D.S.;Ahn, B.H.;Kwark, J.H.
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • 2008.04a
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    • pp.117-119
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    • 2008
  • It is very important to protect life, property at sea from any fire. Recommendation on improved fire test procedures for surface flammability of bulkhead, ceiling and deck finish materials specifies a procedure for measuring fire characterizing their flammability and thus their suitability for use in marine construction. In this paper, we investigated the positive expected by fire test procedures for flammability of bulkhead, ceiling and deck finish materials. Also, unusual materials were analyzed. Finally, we suggest methods to solve several problems related to unusual materials.

  • PDF

An Experimental Study on Acoustic Absorption in a Model Chamber with a Half-Wave Resonator (반파장 공명기를 장착한 모형연소실의 흡음특성에 대한 실험적 연구)

  • Sohn, Chae-Hoon;Park, Ju-Hyun
    • Journal of the Korean Society of Propulsion Engineers
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    • v.12 no.3
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    • pp.34-40
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    • 2008
  • Acoustic design parameters of a half-wave resonator are studied experimentally for acoustic stability in a model chamber. According to the standard acoustic-test procedures, acoustic-pressure signals are measured. Quantitative acoustic properties of damping factor and sound absorption coefficient are evaluated and thereby, the acoustic-damping capacity of the resonator is examined. The diameter and the number of a half-wave resonator, its distribution, and the diameter of an enclosure are selected as the design parameters for optimal tuning of the resonator. Aroustic-damping capacity of the resonator increases with its diameter. When the open-area ratio of the resonator exceeds the optimum value, over-damping appears, leading to the decrease in the peak absorption coefficient and the broadening of absorption bandwidth. As the resonator diameter increases, optimum open-area ratio decreases.

An Experimental Assessment of Combustion Stability of Coaxial Swirl Injectors and an Impinging Injector through Simulating Combustion Test (상압기상연소시험을 통한 동축형 스월 분사기와 충돌형 분사기의 연소 안정성 평가)

  • Park, Junhyeong;Kim, Hongjip
    • Journal of the Korean Society of Combustion
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    • v.22 no.1
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    • pp.46-52
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    • 2017
  • High-frequency combustion instabilities may occur during the development of feasible engine combustors. These instabilities can result in irreparable damages to the wall of combustors or the degradation of engine performance. So, it is essential to identify injectors that have high stability characteristics during the early stages of development. The objective of present study was to assess the stability of coaxial injectors and an impinging injector with different recess lengths in order to develop stable injectors optimally. Stability margin was evaluated based on the distance from operating condition to the unstable regions. A simulating combustion test method was used to analyze the stability of injectors. A small-scale combustion chamber was designed to simulate the first tangential acoustic mode of the actual combustor. Gaseous oxygen and a mixture of methane and propane were used as simulant propellants to satisfy their flow similarity to the actual propellants of a combustor in a liquid rocket combustor. The results indicated that injectors having small recess lengths showed relatively large combustion stability margins. For the injectors of large recess lengths, instability regions with large and super-large amplitude oscillations were observed. Thus, injector with shorter recess lengths had a higher stability than that of longer one due to the different mixing processes.

An Experimental Study on Filling Material for Bored Pile Using High Calcium Ash (고칼슘 연소재를 이용한 매입말뚝의 주면고정액에 관한 실험적 연구)

  • Song, Sang-Hwon;Lim, Yang-Hyun;Seo, Se-Gwan;Cho, Dae-Sung
    • Journal of the Korean Geosynthetics Society
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    • v.16 no.4
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    • pp.13-20
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    • 2017
  • In this study, laboratory tests were performed to evaluate for new filling materials (ZA-Soil) for bored pile that were developed using by high calcium ash. As a result of laboratory test, the uniaxial compression strength of 2 types of ZA-Soil are shown 68.0% and 64.6% compared to ordinary portland cement. And it have a suitable flowability and environmental stability. Also, after 28days, uniaxial compression strength of material mixed with soil and high strength filling material (ZA-Soil) for bored pile is 1.10-1.23 times bigger than material mixed with ordinary portland cement.