NanoSonic demonstrated the use of embedded turbulence sensors to directly measure turbulence on a hydrofoil in a high-speed water tunnel (HSWT) operated by the University of Georgia (UGA). Two flexible turbulence sensors were embedded in a NACA 0018 hydrofoil and placed at the leading edge (x/c = 0.3) and trailing edge (x/c = 0.7) of the chord length. Using the UGA water tunnel, the performance of the NM sensors was evaluated at different flow velocities and angles of attack to characterize various turbulent conditions: attached flow, partially detached flow, and fully detached flow. In each ramp test, the angle of attack (AoA) was kept constant, and the water tunnel velocity was increased stepwise (up to 3.5 m/s in steps of 0.5 m/s) to reach each test point. To evaluate the frequency response of the pressure signals over time, a short-time Fourier transform was used. This allowed the frequency content to be analyzed as the velocity changed, specifically in the ramp velocity cases. Spectrograms with a 5° angle of attack on the ramp velocity signal from the leading-edge and trailing-edge sensors are shown. The spectrogram illustrates key behaviors (ladder structure, harmonic frequencies) consistent with tonal noise, emphasizing the sensor's acoustic sensing capability. The static results highlighted the sensors' ability to identify flow disturbances, while taking advantage of upstream and downstream locations. The frequency-domain response showed the sensors' detection of acoustic events and turbulence over the hydrofoil. The static and dynamic responses of NanoSonic’s sensor products highlight a unique advantage of turbulence/pressure sensor technology and emphasize the potential for use in a variety of subsea applications.
NanoSonic recently developed ultra-wide bandwidth, nanomembrane high-frequency (NM-HF) based pressure transducers for hypervelocity wavefront detection applications, using silicon-on-insulator (SOI) techniques in combination with nanocomposite materials. Customers for such ultra-wide bandwidth pressure transducers are high-speed vehicle and flight control system designers and manufacturers. NanoSonic has demonstrated NM-HF ultra-wide bandwidth pressure transducers with a bandwidth from DC to 5MHz and data interface in subsonic, transonic and hypersonic wind tunnels, and shock tubes in both university and government facilities. The ultrawide bandwidth pressure transducers and data interface include: a carry case for field tests, 2 NM-HF ultrawide bandwidth pressure sensors, a custom signal conditioning unit, a 12 VDC power supply, and a custom GUI-based data interface for electronic transmission.
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NanoSonic’s C2 Repair Kit is a low-cost, VOC-free, easily applied ceramic copolymer (C2) repair system for leaking aviation fuel lines. The fast-curing two-part system provides protection from saltwater corrosion after repair, has exceptional adhesion to various metals with and without primer, and can withstand pressures greater than 200 psi with fuel flow rates up to 8 ft/second. Minimal surface preparation required: sanding, degreasing, and solvent wipe. NanoSonic has worked extensively with the military to ensure rapid repair under numerous environments. SKU:NSM-HS-C2R
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