• Journal of the Korean Institute of Gas
• /
• v.15 no.1
• /
• pp.30-34
• /
• 2011

This paper presents a strength safety evaluation of composite pressure container for hydrogen fuel tanks with a storage capacity of 104 liter and 70MPa pressure. The carbon fiber composite container is manufactured by an aluminum liner of Al6061-T6 and composite multi-layers of hoop winding layer in circumferential direction, $12^{\circ}C$ inclined winding layer and $70^{\circ}C$winding layer in helical direction respectively. The FEM results on the strength safety of composite fuel tanks were evaluated with a criterion of design safety of US DOT-CFFC and KS B ISO 11119-2 codes. The FEM computed results indicate that the proposed design model of 104 liter composite container is safe based on two strength safety codes. But, the computed results of carbon fiber fuel tanks based on US DOT-CFFC code is safer compared with that of KS B ISO 11119-2. Thus the hydrogen gas pressure container of 70MPa may be evaluated and designed by US DOT-CFFC code for more strength safety.

• LP가스
• /
• v.22 no.4
• /
• pp.26-28
• /
• 2010

우리협회는 LPG 용기를 사용하고 있는 전국의 군인 아파트 등 군(軍) 관계시설을 소형저장탱크로 설치한후 벌크로리 통한 안정적이고 경제적인 공급방식 변경 통해 연료비 절감 및 안전성 향상을 도모코자 '전국 군부대 시설의 소형저장탱크 확대보급'을 국방부 물자관리과에 건의했다. 관련 내용을 게재한다.

• Aerospace Engineering and Technology
• /
• v.1 no.1
• /
• pp.55-64
• /
• 2002

A conceptual design of propulsion system for a geosynchronous communication satellite with 12 years design life is presented in this paper. Propellant mass budget for the design life is calculated using total velocity increment (ΔV) flowed-down from mission requirement analysis. Sizes of the fuel and oxidizer tank are derived based on the calculated propellant mass budget, and mass of the pressurant as well as the size and pressure of pressurant tank are calculated too. Thruster positioning, number of rocket engines, and position of tank are determined through Trade-Off Study with Structure & Mechanical Subsystem. Propulsion system configuration and its schematics are presented finally.

• Korean Chemical Engineering Research
• /
• v.50 no.3
• /
• pp.464-470
• /
• 2012

To study characteristics of DME and Propane blended fuel in mixing drum as time passed, mixing experiment of two components was performed. After 20 wt% of DME and 80 wt% of Propane were injected into mixing drum sequentially, and the mixture ratio of blended fuel was analyzed at several sampling ports. Consequently, DME and Propane were not easily mixed and DME was sunk to the bottom of the mixing drum by the density difference. The daily rate of DME ingredient increase was 0.2-0.3 wt%, and it took over 500 hours until two of them were mixed uniformly. And after recirculation of blended fuel in mixing drum, DME and Propane were mixed immediately and uniformly.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2007.11a
• /
• pp.626-629
• /
• 2007

Vibration originated from the fuel pump is transmitted to the fuel pump module and fuel tank. Fuel tank transmits it to chassis of vehicle. Also, noise perturbed through fuel and fuel tank is radiated out. Dynamic characteristics of fuel tank are composed of tank structure and containing fuel quantity. Therefore, this study is focused at fuel tank with various quantity. As a result, characteristics of vibration for various fuel quantity in a tank are identified as the more mass of fuel is, the less the 1st resonance frequency decrease. Also, between acoustic camera and mode shape of modal analysis are used for searching the positions of radiated noise and are found to be in accordance with each other.

• Journal of the Korean Society of Propulsion Engineers
• /
• v.2 no.1
• /
• pp.21-30
• /
• 1998

Design parameters which used to analyze the stress distribution on the tank wall were defined to develop the propellant tank and obtain optimal values. 1/4 modeling of total tank was selected to calculate the stress distribution with respect to the variation of the support lug location and the tank wall thickness and 1/2 modeling was selected for the stress distributions with respect to the variation of fuel outlet location. Actually, 350psi was applied as static load and 12 gravity as a dynamic load during launching on the internal tank wall. The structural analysis was done with respect to attaching condition of the tank in the satellite. Also the effect of the variation of the propellant outlet location from $0^{\cire}$ to $25^{\cire}$ on the stress distribution was investigated. The equivalent stress distribution and optimal parameters induced from analysis results of the each condition will be used as the fundamental data to design the propellant tank.

• Journal of Advanced Marine Engineering and Technology
• /
• v.39 no.6
• /
• pp.599-603
• /
• 2015

To strengthen the existing regulations with respect to carbon emissions in the marine industry, there has been an increase in the number of studies focusing on realizing improvements in the utilization of vessels. While the development of new techniques related to these improvements can be costly, in this paper, we discuss a cost-effective method that may be applied directly to existing ships. The experimental data obtained suggests that the greatest reduction in energy loses can be realized by installing a double-partition wall on the storage tank of the ship, among other methods.

• Proceedings of the Korean Society of Propulsion Engineers Conference
• /
• 2004.10a
• /
• pp.141-145
• /
• 2004

The residual propellant of satellite is the primary factor of satellite life. This propellant used in the satellite is stored as liquid in tanks. But it is very difficult to accurately measure propellant to be used for maintaining of satellite by an irregular influence of environment. In this paper, a new method of gauging propellant residual of satellite employing multi-tank system by measuring mass flow of thermal pumping liquid propellant is presented. In cases of being connected between tanks, propellant in tanks move by temperature difference of tanks. If propellant mass flow is measured at line between tanks, residual propellant in tanks is able to be estimated.

• Journal of the Korean Society of Propulsion Engineers
• /
• v.23 no.6
• /
• pp.87-94
• /
• 2019

This paper contains the process of investigating the cause of fuel filter contamination of P&WC's PT6A-67A engine. An outline of the fuel filter contamination and configuration of the fuel supply line are specified. The analytical methods were classified into fuel component analysis and solid sediment analysis(EDX, TGA, optical microscope). In summary, the sulfur was detected from fuel tank sealant as a major contamination component. As a follow-up, P&WC and the Agency for Defense Development will conduct engine fuel filter cycle checks and fuel tank cleaning for engine operation.

• Journal of Advanced Marine Engineering and Technology
• /
• v.34 no.8
• /
• pp.1074-1083
• /
• 2010

Recently sloshing that fluid in fuel tank is undulating by the external force during motion of automobile, ship and aircraft is greatly affecting by damaging the inside of structure. It's most important to precisely analyze the behavior of fluid by computational fluid dynamics for minimizing the effect of sloshing for the loaded fuel. This study characterized volume of fluid and pressure according to the length and number of vertical baffle and horizontal baffle in fuel tank for Kia Frontier cargo and analyzed for reduction of sloshing during driving on corner and hill by using ADINA-CFD. As a result of analysis, the optimum length for sloshing reduction shows 0.19 m for vertical baffle and 0.08 m for horizontal baffle. And it shows that vertical baffle is better for the reduction effect of sloshing during driving on corners, on the other hand, horizontal baffle is effective and stable during driving on hills.