Improvements to Unsteady Pressure-Sensitive Paint Formulations

Area of Science:

• Aerospace Engineering
• Materials Science

Background:

• Traditional unsteady pressure-sensitive paint (uPSP) formulations face challenges like photodegradation and performance drift.
• These limitations impact their reliability during extensive wind tunnel testing.

Purpose of the Study:

• To investigate novel uPSP formulations for enhanced coating properties and stability.
• To optimize pressure sensitivity, frequency response, and minimize degradation.

Main Methods:

• Systematic evaluation of different grades of titanium dioxide (TiO2) particles and dispersants.
• Characterization of coating properties, pressure sensitivity, temperature dependence, and frequency response.

Main Results:

• Hydrophobic TiO2 particles and high-molecular-weight acrylic co-polymers yielded uPSP coatings with superior smoothness, thickness, and pressure sensitivity.
• The optimized uPSP exhibited linear pressure sensitivity with minimal temperature dependence.
• All tested uPSP formulations demonstrated responsiveness to pressure fluctuations up to 12 kHz.

Conclusions:

• Judicious selection of TiO2 particles and dispersants significantly improves uPSP performance.
• The developed uPSP formulations offer enhanced stability and reliability for aerodynamic testing.
• These advancements contribute to more accurate and durable wind tunnel measurements.