• Title/Summary/Keyword: 음향 공진 모드

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Combustion Stability Characteristics of Fuel-Rich Gas Generators (연료 과농 가스발생기의 연소 안정성 특성 연구)

  • Seo, Seong-Hyeon;Han, Yeoung-Min;Choi, Hwan-Seok
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2007.11a
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    • pp.119-122
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    • 2007
  • The present study employs experimental approach to identify combustion stability characteristics of fuel-rich gas generators. The gas generator of interest, fueled by LOx and Jet A-1, experienced combustion instability coupled to a longitudinal resonant mode of the combustion chamber at about 1200 Hz. The occurrence of instability is strongly associated with acoustic boundary condition at the exit .and axial location of maximum heat release. As a result, stretching heat release zone in the axial direction by increase of the fuel nozzle diameter has dramatically stabilized combustion.

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A Study on The transducer of acoustic sensor to be Single-mode FBG using Hopper Type WDM be in the Making (Hopper type WDM을 이용한 단일모드 FBG(Fiber Bragg Grating)음향센서 트랜스듀서 개발연구)

  • Kim, Kyung Bok
    • Journal of the Institute of Electronics and Information Engineers
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    • v.51 no.10
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    • pp.256-263
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    • 2014
  • We have designed and made three kinds of FBG(Fiber Bragg Grating) Acoustic Transducer using Hopper type WDM on the use of recently developed FBG in Korea. The newly designed three kinds of FBG Acoustic Transducer using Hopper type WDM have an excellent merit of practical use with simple structure of sensors arm as well as the merit with existing fiber sensors. It was possible to detect sound waves in the range of 10 Hz to 18 kHz through the newly designed three kinds of FBG Acoustic Transducer and also, possible to detect its signal within the maximum range of 8.6 m by the use of most suitable resonance condition of the transducer. Especially, we can expect the utilization of low-frequency signal detection instead of existing acoustic sensor in the environment of electric noise and inferior condition. Furthermore, they can be developed as the high-sensibility and multi-point signal detection system through the sensor array system.