A self-powered cathodic protection system using piezoelectric pipe generator based on Kármán vortex and its mathematical model

The municipal pipe system is a crucial component in the water supply and drainage infrastructure of a city and acts as its lifeline. However, over time, the municipal pipe network undergoes corrosion because of continuous use even after its service life. Corrosion can result in significant water loss and environmental pollution and is a substantial threat to the overall functionality of the water supply and drainage system. In this study, a pipeline piezoelectric generator (PPG) is used to harness the kinetic energy from water flow. The PPG is designed to convert this flow energy into mechanical vibrations through a piezoelectric cantilever beam. In addition, the piezoelectric effect transforms mechanical vibrations into electrical energy. A rectifier circuit converts an alternating current into a direct current to ensure a stable power supply. Moreover, the principles of cathodic protection are used to thwart any further electrochemical corrosion of the inner wall metal of the water pipes. This innovative approach safeguards the metal pipe network from deteriorating effects over time and facilitates self-adaptive protection.