About the project
This project explores acoustic scaling between air and water by investigating differences in propeller acoustic radiation in both media. Using full-scale water measurements and partial-scale air measurements, it aims to develop a predictive model for underwater acoustics based on air tests, enhancing our understanding of cross-medium acoustic scaling for propeller noise analysis.
This project aims to revolutionize the prediction of underwater propeller noise by utilizing measurements taken in air, addressing the challenges of measuring propeller noise directly in water.
Accurate acoustic predictions are essential for marine propeller design to reduce noise pollution, enhance efficiency, and comply with strict regulatory standards. However, full-scale underwater testing is often impractical due to high costs and logistical complexities, making reliable scaling methods indispensable. While existing models, such as the cubic power law, allow for scaling between different propeller sizes, minimal research has explored how different fluid environments affect acoustic radiation. Air-based measurements provide significant experimental advantages, but translating these results to underwater conditions introduces uncertainties due to the stark contrasts in fluid properties.
This research will develop a robust predictive framework by integrating numerical simulations with experimental validation. Using RANS simulations and the Blake radiation model, the project will establish equivalency relationships between turbulent flow-induced acoustic radiation in air and water. Controlled experiments will be conducted in both an anechoic chamber (air) and a towing tank (water), with propellers exposed to comparable flow conditions.
Additionally, the project will examine the effect of scale on acoustic radiation by testing 3D-printed propeller blades of varying sizes or through numerical simulations. This comprehensive approach will enable accurate underwater noise predictions from air-based tests, providing critical insights for propeller design and acoustic performance evaluation.
Funding for this project is offered by the Centre for Doctoral Training in Complex Integrated Systems for Defence & Security (CISDnS), which will recruit motivated and inquisitive candidates across the themes of Digital, Physical and Biological systems to provide a diverse and interconnected cohort training environment.
The School of Engineering is committed to promoting equality, diversity inclusivity as demonstrated by our Athena SWAN award. We welcome all applicants regardless of their gender, ethnicity, disability, sexual orientation or age, and will give full consideration to applicants seeking flexible working patterns and those who have taken a career break. The University has a generous maternity policy, onsite childcare facilities, and offers a range of benefits to help ensure employees’ well-being and work-life balance. The University of Southampton is committed to sustainability and has been awarded the Platinum EcoAward.
