• Title/Summary/Keyword: 밸브성능

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Evaluation of the Inherent Flow Coefficient of the Control Valve in the Liquid Propellant Rocket Engine (액체로켓 엔진 성능 보정용 제어밸브의 고유유량특성 계산)

  • Park, Soon-Young;Cho, Won-Kook;Seol, Woo-Seok
    • Journal of the Korean Society of Propulsion Engineers
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    • v.15 no.4
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    • pp.73-78
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    • 2011

  • When a liquid rocket engine - specifically for the gas-generator cycle engine has throttle valves to control the thrust level and mixture ratio of the engine, it is possible to adjust the inherent flow characteristics of the control valves in order to secure a linearized correlation between the control-process-parameters like the thrust or mixture ratio of an engine and the throttle angle of valve. These linearities can reduce the complexity of the control process and make the process more explicit by ensuring the intuitive control. In this point, we proposed an algorithm within the frame of the in-house-developed program to obtain the control valves' inherent flow characteristics which satisfy the linearity, and calculated the sensitivities of control valves with respect to the throttle angle. Also, we compared the obtained inherent flow characteristics with the existed data and concluded the results are satisfactory.

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Effects of Intake Port Swirl and Fuel Injection System on the Performance and Exhaust Emissions in a Turbocharged DI Diesel Engine (터보 차져 DI 디젤엔진에 있어서 성능 및 배기배출물에 미치는 흡기 포트 선회 유동 및 연료 분사계의 성능)

  • Yoon, Jun-Kyu;Cha, Kyung-Ok
    • Journal of ILASS-Korea
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    • v.10 no.3
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    • pp.45-53
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    • 2005

  • The purpose of this study is to analyze that intake port swirl and fuel injection system have an effect on the engine performance in a turbocharged D.I. diesel engine of the displacement 9.4L. As result of steady flow test, when the valve eccentricity ratio moved to cylinder wall, the flow coefficient and swirl intensity is increased. And as the swirl is increased, the mean flow coefficient is decreased, whereas the Gulf factor is increased. Through this engine test, it can be expected to meet performance and emissions by the following applied parameters; the swirl ratio is 2.43, injection timing is BTDC 13oCA and compression is 15.5.

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Hydraulic Control Characteristics of the ABS for an Automotive (자동차 미끄럼방지 제동장치의 유압 제어 특성)

  • Kim, Byeong-Woo;Park, Ho
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.8 no.1
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    • pp.10-17
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    • 2007

  • For the purpose of optimal control of anti-lock brake system, precise dynamic characteristics analysis of the hydraulic modulator, especially solenoid valve is necessary. However, most of researches so law have dealt with dynamic characteristic analysis of valve itself and the results have been restrictive to apply on the actual ABS modulator, where hydraulic pressure is acting. In this study, mathematical modeling and experimental analysis were executed in order to evaluate the valve dynamic characteristics when the hydraulic pressure applied. High pressure on the master cylinder effects on the valve dynamic characteristics have been analyzed quantitatively and performance improvement methods have been suggested varying the design factor. Consequently, results of solenoid valve dynamic characteristics analysis derived in the study can be utilized criteria for the optimal control of anti-lock brake system.

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Excess Flow Valves for Underground Gas Pipeline and their Performance Testing Equipment Development (연료가스 매몰배관용 과류차단밸브와 성능시험 장치 개발)

  • Lee, Ugwiyeon;Joo, Yukyung;Lee, Jinhan
    • Journal of the Korean Institute of Gas
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    • v.22 no.4
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    • pp.74-81
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    • 2018

  • The Korean Government has proceeded petroleum gas pipeline construction business since 2014 for rural districts. The operating pressure of petroleum gas pipeline are from 25kPa to 75kPa which are different from that of natural gas pipeline. Petroleum gas pipeline pressure is ten or forty times higher than natural gas operating pressure. For this reason, petroleum gas pipeline has higher probability of accident occurrence from massive gas leakage. Korea Gas Safety Corporation begins to development excess flow valves and their performance testing equipment since 2017. The excess flow valves stop the gas flow when a overflow happened in gas pipeline. The excess flow valves are generally not installed in main pipeline, because that may block massive gas supply. So, the valves are installed in starting points of branch pipes. According to the number of house and amount of gas use, a shut-off point of exxcess flow valve is determined called as Trip Flow. The trip point is the most important thing of excess flow valve, so, it is required a equipment testing the performances of excess flow valve as trip point.

  • https://doi.org/10.7842/kigas.2018.22.4.74 인용 PDF KSCI