A wind tunnel is a major piece of equipment for conducting aerodynamic experiments and is a duct used to generate artificial airflow (artificial wind).

Wind tunnel test is based on the principle of relativity of motion to simulate various complex states of objects in the air to obtain expected experimental data.

With the development of technology and changes in demand, the traditional wind tunnel pressure measurement method has limitations.

The traditional industry method refers to testing the surface pressure, temperature, vibration and strain of the aircraft through various devices such as sensors, or strain gauges, or pressure-sensitive tapes.

During the test, it is necessary to physically connect the above types of equipment to the model (such as punching holes), and then pass the data to the computer for calculation by other means.

The aerospace industry is developing rapidly, but it is also accompanied by some problems: on the one hand, there is a surplus of wind tunnel equipment, and on the other hand, there is a lack of high-performance wind tunnels.

The new wind tunnel experiment method is that the pressure-sensitive paint sprayed on the surface of the model will emit fluorescence after being excited. The fluorescence image of the surface of the object is captured by optical method, and it is solved by means of image processing to obtain the global pressure distribution on the surface of the model.

The pressure sensitive coating (PSP) is sprayed on the prepared body model by spray painting. It is easy to use, avoids the tedious installation process, and reduces the potential damage to the model during the disassembly and assembly process.