Multi-rotor wake interactions are very complex in nature, especially for small size rotors relevant to UAVs. At small scales, viscous effects dominate the flow field and affect the nature and scale of wake features such as tip vortex and trailing edge vortex sheet. The influence of these wake features on the flow is found to be more spread spatially (with respect to the rotor dimensions) compared to large size helicopter rotors. This hints towards the possibility of affecting the performance of a small multirotor vehicle by deliberate and controlled vortex-blade, vortex-vortex interactions.
Flow induced on a blade by a vortex can cause flow separation or reattachment, strengthening or weakening of tip vortices, or significant change in inflow at blade sections. All of these have implications on aerodynamic efficiency, vibrations, noise, and flight envelop.
In this study, the rotors are synchronized for gaining full control over the wake-wake and blade-wake interactions. The project involves performance and acoustic measurements, flow visualization, and particle image velocimetry.
nderstanding the impact of urban wind gusts on small rotary-wing vehicles is essential for advancing drone technology. This research focuses on experimentally studying gusts in urban environments and their effects on rotor aerodynamics and control. The study involves developing gust generation equipment, conducting time-resolved rotor load measurements, and utilizing advanced flow diagnostics. Insights from these experiments will improve our understanding of rotor-gust interactions and contribute to developing robust aerodynamic models for enhanced drone performance.
Cyclorotors offer a promising alternative to conventional propulsion systems due to their unique thrust vectoring capabilities. This research focuses on the development and experimental analysis of cyclorotors to enhance their aerodynamic performance and control effectiveness. The study involves designing and testing prototype cyclorotors, measuring time-resolved aerodynamic loads, and employing advanced flow diagnostics to understand rotor-flow interactions. Insights from these experiments will aid in optimizing cyclorotor design and contribute to the development of efficient, highly maneuverable aerial vehicles.
Indigenizing advanced research equipment is key to democratizing experimental studies and supporting local innovation. This project focuses on the development of sensitive torque sensors, multi-axial force-torque sensors, pressure scanners, and seed generators for experimental research. By designing and manufacturing these high-precision instruments locally, we aim to enhance accessibility for startups and academic institutions. These efforts will not only reduce dependence on imported equipment but also foster a robust ecosystem for experimental research and technological development.