• Title/Summary/Keyword: Fuel tank

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Transient Response Analysis of Cylindrical Liquid Fuel-Storage Tank subject to Initial Acceleration (원통형 액체 연료탱크의 초기 가속에 따른 과도응답 해석)

  • Lee, S.Y.;Joo, Y.S.;Kim, K.W.;Cho, J.R.
    • Proceedings of the KSME Conference
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    • 2000.11a
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    • pp.475-480
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    • 2000
  • The transient dynamic-response analysis of fuel-storage tanks of flying vehicles accelerating in the vertical direction is achieved with finite element method. A fuel-storage tank is a representative example of the fluid-structure interaction problem, in which structure and fluid media interact strongly. For the accurate analysis of this complicated fluid-structure system, we employed ALE(arbitrary Lagrangian-Eulerian) coupling method. Two types of fuel-storage tanks, one with two baffles and the other without baffle, are considered to examine the effect of baffles. The fuel-storage tank with baffles shows more uniform hydrodynamic pressure distribution, resulting effective stress in structural region and faster convergence from transient to steady states. MSC/Dytran, a commercial FEM software for the 3D coupled dynamic analysis, is used for this analysis.

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Development of a measurement device of water level at the bottom of fuel tanks using an optical cable sensor. (대용량 탱크에서 물과 유류의 이중 액면 높이 계측용 센서 개발)

  • 김진만;김희식
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.471-474
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    • 2002
  • A fuel tank contains water at the bottom under the fuel. The water comes from humidity by temperature change of inside and outside of tank. So it is necessary to measure both level to check precise amount of oil. But measuring instrument for level of water and fuel is not available yet. Since the fuel is inflammable, the sensor system must not include any electric circuits in the fuel tank. Optical cable sensor can satisfy this non-explosive condition. The displacement of a float changing by water level makes bending curvature of optical cable different. As the float rise up, the optical cable is bent more and the light signal in the cable decreases. The reduction of light signal is detected and it is converted into the change of water level. The output signal from a photo diode shows the proportional relation of water level. The increase of sensor voltage as a unit of ㎷ follows the level position of the float that is located between water and gasoline in the tank.

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Development of Vacuum Refueling Process for Fuel Tank (연료탱크 진공주유절차 개발)

  • Park, Jeong-Bae;Min, Seong-Ki;Lee, Se-Young;Kim, Young-Shin;Lee, Jong-Chul;Jang, Ki-Won
    • Journal of the Korean Society of Propulsion Engineers
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    • v.15 no.3
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    • pp.80-85
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    • 2011
  • The air in the fuel tank could cause oxidation of fuel during storage, and it also reduced the fuel transfer performance. To find better procedure for refueling of aircraft fuel tank, the vacuum refueling process was proposed to reduce the air in the fuel tank. In this study, the vacuum refueling process was established and tested, it could be helpful to find out what happened during vacuum refueling. Also the revised vacuum refueling process was proposed to reduce the air and refueling time.

Measurement of Damping Ratio of Fuel Sloshing in a Baffled Liquid Propellant Tank of KSR-III Rocket (KSR-III 로켓의 액체 연료 탱크 내에서 발생하는 슬로싱 현상의 배플에 의한 감쇄율 측정)

  • Park, Soon-Hong;Yoo, Joon-Tae;Yi, Yeong-Moo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.11b
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    • pp.172-175
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    • 2002
  • Sloshing of fuel in a liquid propellant tank is an important part of the dynamic and the stability analysis of the rocket. Baffles are installed in a propellant tank to reduce the instability due to sloshing. Multi degree of spring-mass-damper model was used to model sloshing of fuel in an axisymmetric tank. The natural frequencies and damping ratios are estimated. In order to verify the estimated natural frequencies and damping ratios, tests are performed for the real propellant tank of KSR-III with single ring baffle. Results of fuel sloshing analysis are compared with those of tests.

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Measurment of Damping Ratio of Fuel Sloshing in Baffled Liquid Propellant Tank of KSR-III Rocket (KSR-III 로켓의 액체 연료 탱크 내에서 발생하는 슬로슁 현상의 배플에 의한 감쇄율 측정)

  • Park, Soon-Hong;Yoo, Joon-Tae
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.11a
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    • pp.323.2-323
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    • 2002
  • Sloshing of fuel in a liquid propellant tank is an important part of the dynamic and the stability analysis of the rocket. Baffles are installed in a propellant tank to reduce the instability due to sloshing. Multi degree of spring-mass-damper model was used to model sloshing of fuel in an axisymmetric tank. The natural frequencies and damping ratios are estimated. In order to verify the estimated natural frequencies and damping ratios, tests are performed for the real propellant tank of KSR-III with single ring baffle. Results of fuel sloshing analysis are compared with those of tests.

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Design of Automotive Fuel Tank for Preventing Liquid Carry Over Using Taguchi Method and Approximate Optimization (다구치 방법과 근사최적설계를 이용한 자동차 연료탱크의 연료 넘침 방지 시스템 설계)

  • Park, Gyu-Byung;Lee, Yongbin;Cho, In-Geun;Choi, Dong-Hoon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.8
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    • pp.1059-1067
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    • 2013
  • Automotive fuel tank is generally divided into two parts: main frame and assembly parts. While the car is running, valves are used to prevent liquid carry over and to discharge evaporated gas from the fuel tank. However, current fuel tank designs focus on the gas ventilation or secured location. In this study, the location of the parts used to prevent liquid carry over within the fuel tank is evaluated during an optimal design process. To develop this design process, an approximate optimization is applied. Through the optimal design process, the optimal valve location in fuel tank is determined and the approximate optimization is validated by the Taguchi method. Finally, the optimized valve location is used to reduce the development cost and time and to contribute toward improved automobile quality owing to enhanced reliability.

A Study on the Strength Safety of an Aluminium Liner for a Hydrogen Fuel Storage Tank (수소연료 저장탱크용 알루미늄 라이너의 강도안전성에 관한 연구)

  • Kim, Chung-Kyun;Kim, Do-Hyun
    • Journal of the Korean Institute of Gas
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    • v.16 no.3
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    • pp.16-21
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    • 2012
  • In this study, the strength safety for 110 liter hydrogen fuel storage tank with 70MPa filling pressure has been analyzed using a FEM technique. The strength safety of a composite fuel tank in which is fabricated by an aluminum liner of 6061-T6 and carbon fiber wound composite layers of T800-24K and T700-12K of Toray, and MR60H-24P of Mitsubishi Ray has been investigated based on the criterion of a strength safety of US DOT-CFFC and Korean Standard. The FEM computed results on the strength safety of 70MPa hydrogen gas tank showed that the hydrogen fuel storage tank in which is fabricated by T800-24K and T700-12K of Toray, and MR60H-24P of Mitsubishi Ray is safe because those two carbon fibers have very similar material properties. But, the composite storage tank with a filling pressure of 70MPa in which is fabricated by T700-12K of Toray may not guaranty the strength safety, and thus this study recommends a composite hydrogen fuel tank under 60MPa.

An Experimental Study on Noise Characteristics of Fuel Pump System (대형 승용차량용 연료펌프의 소음특성에 대한 실험적 고찰)

  • Sa, Jong-Sung;Kang, Tea-Won
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.20 no.5
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    • pp.612-617
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    • 2011
  • The comfort and quietness of vehicle has been improved greatly due to the development of technology in automobile industry. Some of noise reductions, for example, are driven by the improvement in the power-train system. Due to better in all performance, it is required to reduce more noise in automobile components. One of them is related to the fuel pump system including a pump and a tank. Therefore, this study is focused on investigating the characteristics of fuel pump and fuel tank first, and then comparing the data before and after installation of fuel pump system in a testing vehicle. Additionally, the measured data will be analyzed to identify the problems and provide knowledge to reduce the level of noise and vibration in fuel pump system.

Design Optimization of Fuel Sensor Location in Aircraft Conformal Fuel Tank (항공기 보조연료탱크의 연료량 측정센서 위치 최적설계)

  • Jung, Kyusung;Yang, Junmo;Lee, Sangchul;Yi, Yongsik;Lee, Jaewook
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.46 no.4
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    • pp.332-337
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    • 2018
  • This paper presents the design optimization of fuel sensor location used to measure remained fuel amount in aircraft conformal fuel tank. The conformal fuel tank is utilized to expand the mission range in airplane, and the sensor location is a critical design variable determining the measurement accuracy. In this work, the sensor location is optimized to minimize unmeasurable fuel amount due to non-contact between fuel and sensor. The simplified model is prepared from the conformal fuel tank CATIA model, and the unmeasurable fuel amount is calculated. Then, the optimization is performed using MATLAB optimization solver. The optimized sensor location is validated by comparing with the location obtained using parametric study.

Influence of Impact from Anti-Aircraft Bullet on Rotorcraft Fuel Tank Assembly

  • Kim, Sung Chan;Kim, Hyun Gi
    • International Journal of Aerospace System Engineering
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    • v.5 no.1
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    • pp.1-8
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    • 2018
  • Military rotorcrafts are constantly exposed to risk from bullet impacts because they operate in a battle environment. Because bullet impact damage can be deadly to crews, the fuel tanks of military rotorcraft must be designed taking extreme situations into account. Fuel tank design factors to be considered include the internal fluid pressure, the structural stress on the part impacted, and the kinetic energy of bullet strikes. Verification testing using real objects is the best way to obtain these design data effectively, but this imposes substantial burdens due to the huge cost and necessity for long-term preparation. The use of various numerical simulation tests at an early design stage can reduce the risk of trial-and-error and improve the prediction of performance. The present study was an investigation of the effects of bullet impacts on a fuel tank assembly using numerical simulation based on SPH (smoothed particle hydrodynamics), and conducted using the commercial package, LS-DYNA. The resulting equivalent stress, internal pressure, and kinetic energy of the bullet were examined in detail to evaluate the possible use of this numerical method to obtain configuration design data for the fuel tank assembly.