Sign in Subscribe
Electronic components

Rain-Driven Impulse Turbine for Vibration-Based Energy Harvesting

Strategic Insights

— 2 min read

Researchers at Prince of Songkla University have developed a rain-driven impulse turbine for vibration-based energy harvesting using piezoelectric transducers. The turbine collects rainfall energy into electrical energy, employing a funnel-based rain collection mechanism and a specially designed turbine. Financial support for this research came from the Department of Mechanical and Mechatronic Engineering, Faculty of Engineering, Prince of Songkla University, Thailand.

Key Takeaways:

  • The rain-driven impulse turbine uses piezoelectric transducers to convert mechanical vibrations into electrical energy, achieving near-full charge in 15 minutes and sustaining a 3-hour operation of a low-power load.
  • The turbine's mechanical configuration was optimized to match the beam's resonance frequency, improving vibration amplitude and energy conversion.
  • Experiments tested the minimum rainfall required for turbine activation, pouring 80-1000 ml of water from 66 cm above the blades, and demonstrating that greater rainfall intensity or larger funnel surface area improves turbine flow.
  • The turbine's central shaft drives a rotating disk with an impact pin, striking a cantilever beam to generate mechanical vibrations, which are converted into electrical energy using piezoelectric transducers.
  • The research highlights a mechanically robust alternative to direct raindrop impact or surface-mounted harvesters, offering a practical mechanism for harnessing rainfall energy in remote or off-grid environments.
  • The system consists of a funnel-based rain collection mechanism, a 36 cm pipe, and a specially designed turbine, which is optimized to match the beam's resonance frequency.
  • The research has been peer-reviewed and published in the Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science.

Statistics:

  • 80-1000 ml of water was poured from 66 cm above the blades to test the minimum rainfall required for turbine activation.
  • The turbine achieves near-full charge in 15 minutes with a low-power load.
  • The system sustains a 3-hour operation of a low-power load.
  • The discharged rainwater generates a substantial flow through the pipe, enabling the water turbine to operate effectively over multiple cycles within a short duration.
  • 36 cm is the diameter of the pipe used in the rain-driven impulse turbine.

Sources:

  • NewsRx. Data on Mechanical Engineering Described by Researchers at Prince of Songkla University (Rain-driven Impulse Turbine for Vibration-based Energy Harvesting Using Piezoelectric Transducer). Journal of Engineering. October 20, 2025; p 354.
  • Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2025.
  • Sage Publications Ltd, 1 Olivers Yard, 55 City Road, London EC1Y 1SP, England.

Read more