As our society continues to develop, various electronic devices have appeared in our lives. However, with these developments, environmental pollution and energy shortage also have been highlighted. So, the technology that converts green energy into available energy has become the most important research field. In this regard, many wireless electronics, such as drone, UAV, and electronic car, require lightweight, low cost, and high efficiency self-powered sensors and generators. To charge and generate electricity wireless electronics itself, various wind energy harvesting methods had been studied through the variety of researches such as electromagnetic generator, piezoelectric generator, and triboelectric generator. Among the wind energy harvesting methods, a triboelectric nanogenerator (TENG) is very important generating mechanism thanks to its simple design, input sensitive output, and high power density. A lot of studies indicated that TENGs would be able to use as wind power generators and self-powered sensors by inducing rotation or vertical contact-separation motions using windmills and the fluttering behaviour flexible substrates1. However, the robustness and durability of the wind-driven TENGs continue to mount challenges due to the wear and fatigue failure caused by friction between two dielectric materials and a repeatedly applied load during flutter motion. Recently, the wind-rolling triboelectric nanogenerator (WR-TENG) was proposed that could generate the electric energy in a wide wind speed range without fracture or critical damage by using the vortex whistle design and lightweight dielectric materials2. However, its qualified design that the presence of inlet and outlet shows the limitation of application like the uni-directionality and non-compact design.
To overcome these drawbacks, this study demonstrated the advanced design of wind-driven triboelectric nanogenerator, Omnidirectional wind-rolling triboelectric nanogerator (OWR-TENG). As shown in the Figure, the whole inlet of OWR-TENG can function as the inlet itself and outlet at once. Due to its functional design, the OWR-TENG has the omni-directionality and compact design that can be applied in variety application. The computational fluid dynamics (CFD) simulations are used to improve the efficiency of mechanical energy conversion and the sensitivity of self-powered anemometer. The analysis of CFD can visualize the complex flow and provide the design parameters with consideration for the applicability such as the velocity of lightweight dielectric materials, robustness, and drag force. The Omnidirectional wind-rolling TENG is a novel approach for a sustainable wind-driven TENG design, and for various practical applications that can be used in wind tunnel, automobiles, airplanes, and drones.