Julien Deparday
Experimental fluid dynamics. My research and experience.
Archives
A Self-Sustainable and Micro-Second Time Synchronised Multi-Node Wireless System for Aerodynamic Monitoring on Wind Turbines
in IEEE Access, vol. 11, pp. 119506-119522, 2023 Wind energy generation plays a vital role in transitioning from fossil fuel-based energy sources and in alleviating the impacts of global warming. However, global wind energy coverage still needs to rise, while requiring a significant step up in conversion efficiency: monitoring wind flow and operational parameters of…
Instrumentation and Measurement Systems: Aerosense: A Wireless, Non-Intrusive, Flexible, and MEMS-Based Aerodynamic and Acoustic Measurement System for Operating Wind Turbines
in IEEE Instrumentation & Measurement Magazine, vol. 26, no. 4, pp. 12-18, 2023 Wind energy as a renewable energy source has gained in popularity in recent years as a viable means to replacing fossil fuels. Wind turbines form extremely sophisticated systems, operating under extreme and time-varying loads of polymorphic nature (e.g., wind, waves) and under…
Development of a wireless, non-intrusive, MEMS-based pressure and acoustic measurement system for large-scale operating wind turbine blades
in Wind Energy Science, 7(4):1383-1398, 2022 As the wind energy industry is maturing and wind turbines are becoming larger, there is an increasing need for cost-effective monitoring and data analysis solutions to understand the complex aerodynamic and acoustic behaviour of the flexible blades. Published measurements on operating rotor blades in real conditions are very scarce…
Aerosense: Long-Range Bluetooth Wireless Sensor Node for Aerodynamic Monitoring on Wind Turbine Blades
in Journal of Physics: Conference Series, 2265(2):022074 , 2022 Predictive maintenance and structural health monitoring are challenging and promising research fields today. In particular, cost-effective and long-term monitoring of wind turbines has been proven to be one of the key elements to successfully increase their efficiency. Accurate numerical modeling and real-time control-in-the-loop play an increasingly…
Experimental analysis of a strong fluid-structure interaction on a soft membrane – Application to the flapping of a yacht downwind sail
in Journal of Fluids and Structures, 81:547–564, 2018 In the present study we investigate the flapping instability of a light, soft, highly cambered membrane subject to wind loading. An original in-situ experiment is developed where time-resolved pressures and forces are measured on a full-scale yacht downwind sail called a spinnaker. Particular features of this aero-elastic…
Modal Analysis of Pressures on a Full-Scale Spinnaker
in Journal of Sailing Technology, 05:1–21, 2017 While sailing offwind, the trimmer typically adjusts the downwind sail “on the verge of luffing”, occasionally letting the luff of the sail flap. Due to the unsteadiness of the spinnaker itself, maintaining the luff on the verge of luffing requires continual adjustments. The propulsive force generated by the…
Full-scale flying shape measurement of offwind yacht sails with photogrammetry
in Ocean Engineering, 127:135–143, 2016 Yacht downwind sails are complex to study due to their non-developable shape with high camber and massively detached flow around thin and flexible membranes. Numerical simulations can now simulate this strong Fluid-Structure Interaction, but need experimental validation. It remains complex to measure spinnaker flying shapes partly because of their inherent…
Experimental investigation of asymmetric spinnaker aerodynamics using pressure and sail shape measurements
in Ocean Engineering, 90:104–118, 2014 An innovative method combining simultaneous on-water pressure and sail shape measurements for determining aerodynamic forces produced by sails is described and used on Stewart 34 and J80 Class yachts flying asymmetric spinnakers. Data were recorded in light and medium winds in order to check the reliability, accuracy and repeatability of…