ESTIMATION OF CENTER-OF-GRAVITY POSITION VARIATION INFLUENCE ON AIRPLANE LIFT-TO-DRAG RATIO, POLAR DIAGRAM AND FLIGHT RANGE

Ruslan U. Tsukanov, Victor I. Ryabkov

Abstract


The method of transport category airplane flight range estimation taking into account its center-of-gravity position variation in the process of fuel utilization at cruising flight mode is presented. The method structure includes the following models:

– Interinfluence of main parameters on each other in the process of fuel utilization;

– Estimation of CG position influence on lift-to-drag ratio in cruising mode;

– Quantitative estimation of center-of-gravity position variation influence on airplane flight range.

Simulation of the main parameters is based on authoring researches, establishing interinfluence among geometrical and aerodynamic parameters of wing, parameters of horizontal tail and center-of-gravity position variation caused by fuel utilization in cruise flight. Such model allows estimating airplane center-of-gravity influence on their values and relative position.

Aerodynamic parameters variation caused by center-of-gravity shift resulted in necessity to take the influence into account, for required engine thrust variation; that is shown in the publication in the form of dependences  allowing to take into account the required thrust variation and their influence on range variation.

On the base of interinfluence model and taking into account required thrust variation (with center-of-gravity position shift), lift-to-drag variation has been obtained and analyzed in the form of dependences ,  for middle airplane of transport category.

Expression for estimation of airplane flight range under variable values of its mass and center-of-gravity position is obtained on the base of these models; that allows to increase flight range by means of center-of-gravity position dedicated shift.

On the example of mid-range transport airplane, it is shown, that at Mach number  and center-of-gravity shift back from  to , the increase of flight range makes .

On the base of presented models, it is shown, that airplane center-of-gravity position influences lift-to-drag ratio, fuel efficiency and as a result on flight range at cruising flight mode.

Application of aft center-of-gravity position allows to decrease engine required thrust (and to decrease fuel consumption), and increase lift-to-drag ratio and airplane flight range.


Keywords


airplane center-of-gravity, fuel trim transfer, engine required thrust, lift-to-drag ratio, flight range

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References


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DOI: https://doi.org/10.32620/oikit.2021.93.08

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