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http://dx.doi.org/10.5139/JKSAS.2003.31.1.073

A Numerical Analysis on Transient Fuel Temperatures in a Military Aircraft with Additional Fuel Supplies and Return  

Kim,Yeong-Jun (한국항공우주산업(주) T-50 세부계통팀)
Kim,Chang-Nyeong (경희대학교 기계-산업시스템공학부)
Kim,Cheol-In (국방과학연구소)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.31, no.1, 2003 , pp. 73-84 More about this Journal
Abstract
A transient analysis on fuel temperatures in an aircraft was studied using the finite difference method. Numerical calculation was performed by an explicit method of modified Dufort-Frankel scheme. Among various missions, close air support mission was considered with 20% hot day ambient condition in subsonic region. The aircraft was assumed to be in turbulent flow. The fuel system model with additional fuel supplies and return concept was considered. As a result of this analysis, the fuel tank temperatures have increased with the increase of the additional fuel supplies. In contrast to tank temperatures, the fuel temperature at the engine inlet has decreased with the increase of additional fuel supplies except in some in-flight phases having high engine fuel flow. From this analysis, the fuel system with the additional fuel supplies and return concept has been shown to be an effective method to decrease the engine inlet fuel temperature. Also, it has been shown that fuel flow rate through fuel/oil heat exchanger is a key factor influencing fuel temperature.
Keywords
Finite Difference Method; Close Air Support; 20% Hot Day; Turbulent Flow; Fuel System;
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