Luminescent Paint for Air Pressure Sensing
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Luminescent Paint for Air Pressure Sensing∗ R V Lakshmi, S T Aruna, Bharathibai J Basu Luminescent coating, more popularly known as pressuresensitive paint (PSP) is a relatively new aerodynamic measurement tool for providing a field measurement of pressure over a model surface in wind tunnel testing. It provides information on the flow anomalies present at any point on the surface, unlike the discrete data from pressure taps. The technique is based on the principle of dynamic luminescence quenching of luminescent molecules present in the paint by oxygen molecules. PSP coating comprises luminescent sensor molecules embedded in an oxygen-permeable binder. On illumination with light of an appropriate wavelength, the coating exhibits luminescence. The luminescence of the PSP coating is inversely related to the surface pressure on the coated model. This article discusses these aspects in detail and provides an overview of the work carried out in this direction across the world.
R V Lakshmi is a Senior Scientist at CSIR-NAL. Her research interests include sol-gel coatings, nanomaterials, superhydrophobic coatings, PSP and stealth materials.
S T Aruna is a Senior Principal Scientist at CSIR-NAL. Her research interests include nanomaterials, plasma
1. Introduction The flow of air over the surface of an aircraft wing is the element which influences its lift and causes the aircraft to fly. Hence, the lift of an aircraft is the direct result of the pressure exerted over the surface of the wings by the flow of air. Pressure, which deals with the dynamics of the flow of air, is one of the important physical quantities in aerodynamics, Surface pressure measurements are of fundamental importance in aerodynamic testing. It has long been a desire of aerodynamicists to have this measurement accurately and flexibly. Generally, studies on fluid or gas dynamics are carried out in wind tunnels. Wind tunnels are ground-based experimental facilities where air currents are generated to simulate
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sprayed thermal barrier coatings, solid oxide fuel cells, and ceramic processing.
Bharathibai J Basu retired as Chief Scientist from CSIR-NAL in 2014. The pioneer of PSP development at NAL, her research interests were PSP, superhydrophobic and icephobic coatings, sol-gel based corrosion resistant coatings and chemical analysis.
Vol.25, No.11, DOI: https://doi.org/10.1007/s12045-020-1076-x
RESONANCE | November 2020
1579
GENERAL ARTICLE
Figure 1.
Aerodynamic model in a wind tunnel [1].
Keywords Pressure map, oxygen, quenching, luminescence, wind tunnel, luminophores.
Conventionally, surface pressure measurements are based on data obtained from pressure taps or transducers. This technique, although very well known, and accepted for its accuracy and response time, has several limitations.
the actual airflow in the atmosphere. The aerodynamic models are placed inside the test section of the wind tunnel, and various physical parameters are altered to simulate the flow conditions identical to what the aircraft encounters during actual fli
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