2259. A Method for Calculating Fuel Slosh Time Lag


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C M Boesch, B C Lee: 2259. A Method for Calculating Fuel Slosh Time Lag. 1995.



Fuel slosh data is required to comply with the International Air Transport Association (IATA) flight simulator data requirements. One required parameter of the fuel model is the fuel slosh time and its effects on center of gravity travel. Understanding the fuel slosh effects on the c.g. of the aircraft is important for stability and control. This paper shows the development of a method to predict the time for fuel to settle after the airplane has been maneuvered. The approach taken was to write a computer program that calculates slosh time. The program resulted from the development of a fuel slosh model. The model is based primarily on the Bernoulli Theorem for fluid flow. The program is valid for roll/pitch or acceleration maneuvers, any quantity of fuel, and any initial/final angle combination. It is applicable to wing tanks with or without baffle ribs. Previously, a time constant was used to represent the entire fuel slosh model. This new analysis method allows for representation of individual portions of the model given any fuel quantity, angle, and maneuver combination. It can be concluded from the analysis that various combinations of fuel quantity, angle, and type of maneuver provide significant changes in slosh time. Slosh times for a baffled wing tank doing a negative pitch maneuver are very different from doing a positive pitch maneuver. Therefore, to give a better representation of the entire fuel slosh model, it is necessary to provide slosh times for each maneuver condition.


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