SYNTHESIS OF THE FORM OF KINTSIVKY LOPATY OF THE LOADING GUIDE OF SAFE LITERAL VERTICAL TYPE APPARATUS TO REDUCE NOISE LEVEL BY USING COMPUTER MODELING

Abstract

Due to the recent expansion and accessibility of modern autopilots a large number of drones have appeared. It is possible to create smaller UAVs, while leaving them autonomous. But major decisions of aerodynamics remained unchanged, including aerodynamics of the helicopter UAV.For the large helicopters new blades forms are invented and design technologies are improved in order to increase the flight speed and reduce the noise generated by the rotor. However, for smaller UAV no ready solutions are represented. There is a size range of UAV which can not use solutions designed for large vehicles, but for small UAVs a significant improvement of characteristics should be provided.The most significant noise source of the helicopter UAV is its rotor, including blades tips that generate several types of noise. Noise level determines the shape and aerodynamic profile blade tip, so we need to choose a form of blade tip, which will reduce the intensity and size of the vortex, or change its location so that it will also lead to the desired result. Also vortex noise can be reduced by reducing the main rotor thrust or loading on the main rotor area.Parameters that influence the main rotor noise, especially speed of blade tip, the loading on the main rotor area, and the number of blades significantly affect the flight characteristics of the main rotor. It follows that any improvement of the aerodynamic characteristics of the main rotor can be used to reduce the helicopter noise. This issue is under review performed by the authors of the study submitted in this article.The influence on creating a blade tip vortex at different angles of attack is investigated on the example of the main rotor blades of the helicopter UAV with the takeoff weight of 15 kg.The study was carried out for various forms of computer models by simulation of flow at the appropriate Reynolds numbers in CAD CATIA using Flo EFD as a tool module, which provides hydrodynamic modeling processes. The analysis of the geometric parameters was performed and the shape which provides the best effect to reduce noise generated by the blade was defined. It was determined the dependance on the geometric parameters that will predict the tip impact on the rotor noise properties.