• Title/Summary/Keyword: 헬름홀쯔 공진기

Search Result 2, Processing Time 0.016 seconds

Fluid Network Analysis for the Fuel-Supply Systems of Gaseous-Injection-Type LPG Engines (가스분사 방식 LPG 엔진의 연료공급시스템 관로 유동해석)

  • Yun, Jeong-Eui
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.35 no.10
    • /
    • pp.1019-1024
    • /
    • 2011
  • The gaseous fuel injection(GFI) type of LPG fuel-supply system is more advantageous than liquefied fuel injection(LFI) from the viewpoint of durability and cost reduction. However, compared with LFI types of LPG fuel-supply systems, in the GFI systems it is difficult to achieve precision fuel metering because of the compressible characteristic of the gaseous fuel. In this study, a Helmholtz resonator is proposed as an appropriate system for precision fuel metering in GFI systems, and the effects of the Helmholtz resonator on the fuel metering are simulated by the commercial flow-network-analysis package Flowmaster.

A Study on Quantification of Damping Efficiency of Acoustic Cavities by Absorption Coefficient (흡음 계수를 이용한 연소불안정 제어용 음향공의 감쇠 정량화)

  • Cha, Jung-Phil;Song, Jae-Gang;Hong-Jip Kim;Ko, Young-Sung
    • Journal of the Korean Society for Aeronautical & Space Sciences
    • /
    • v.35 no.5
    • /
    • pp.438-445
    • /
    • 2007
  • A Helmholtz resonator as a stabilization device to control high-frequency combustion instabilities in liquid rocket engine is adopted and its damping capacity is verified by linear acoustic analysis and atmospheric acoustic tests. To compare the results of acoustic attenuation effect in accordance with uni-resonator's geometry, quantitative analyses were made in the cases of various orifice diameters and lengths. Next, in the experiments to compare the results of acoustic attenuation effect by a difference in the number of resonators, damping capacity of harmful resonant frequency was improved by the increase of the number of resonators. On the other hand, attenuation efficiency of the frequency tended rather to lower due to over damping from the point of view of absorption coefficient. As the result, tuning the suitable geometry for the resonator to the resonant frequency is required for the control using the resonator. Also, the design of resonator's geometry and the choice of its number are important to put up the optimal efficiency in consideration of restriction of its volume.