Numerical investigation of the effect of the use of multiple propeller systems on flight performance in unmanned aerial vehicles

The aim of this study is to try to solve the need for Fixed Propeller Unmanned Aerial Vehicles by using multiple propellers in the horizontal and vertical directions without changing the electronic equipment and propeller type with the changes in the total take-off weight. In unmanned aerial vehicles, energy needs are met by using electrical power effectively with the help of a battery, which is stored as a fuel system in many of them. There will be changes in all of the engine, battery and propeller systems that the aircraft will need as a result of flight altitude, flight altitude, body weight and useful load information. The weight and cost of electronic equipment do not increase proportionally to the amount of increase in aircraft take-off weight. For example, if you want the battery capacity to increase by 2 times, the weight and cost of the battery will increase more than 2 times. However, the required thrust, that is, the weight increase in the aircraft, will cause the change of all electronic equipment. When the compatibility between these working equipments is ensured, the problem can be solved by changing the number of electronic equipment even if the weight of the aircraft changes. In this study, with the help of Ansys Fluent, a certain distance was left between the propellers placed in horizontal and vertical directions as double and triple of equal diameter, and the minimum distance of this distance and whether there was a loss of efficiency in the use of multiple propellers were explained in detail. Here, multiple propeller pairs were operated both in the same direction and in opposite directions, and distance and direction analyzes were also carried out. In addition, the compatibility of the propeller pairs is shown graphically and visually whether it is similar or not in different revolutions.