http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Numerical Prediction on Siphon Break Phenomena during Defueling for an Aircraft Fuel Tank
Kang-Sik Bae(배강식),Jae Hyeok Jeon(전재혁),Ji Hoon Lee(이지훈),Edwin L. Blosch 항공우주시스템공학회 2019 항공우주시스템공학회 학술대회 발표집 Vol.2019 No.11
An investigation of the siphon break phenomena during defueling of an aircraft wing tank was performed using Computational Fluid Dynamics. A computational model was developed of a wing tank with a particular siphon break line design for which test data are available. A two-phase fuel-air model was solved with the Volume-of-Fluid method. The results indicate the model is able to predict the siphon break event dependence on defueling rate and the resultant undershoot height, measured from the fuel pool level to the siphon break line end, as well as the liquid mass flow rates inside the main pipe. It can thus be used to improve the design to reduce defuel times or assess performance for this kind of passive fuel system.
HC Diffusion Model in Ullage during Climb for an Aircraft Fuel Tank
Kang-Sik Bae(배강식),Kyeong Won Bae(배경원),Edwin L. Blosch 항공우주시스템공학회 2019 항공우주시스템공학회 학술대회 발표집 Vol.2019 No.11
A numerical solution designed to predict the composition of aircraft fuel tank ullage has been investigated. The mathematical model is based on the physical processes governing gas-phase diffusion in a stratified ullage. Since an oxygen (O₂) and hydrocarbon (HC) mixture can be combustible, particular attention has been paid to oxygen and hydrocarbon concentrations in the ullage environment. The diffusion coefficient of the HC mixture was calculated numerically for a range of pressure conditions representing altitudes from sealevel to 60,000 ft. Comparisons are given to the calculated mass diffusivity of HC with JP-8, JP-4, and water vapor are described.