Flat plate boundary layer flow display experiment tracer particle spreading device

The invention discloses a flat plate boundary layer flow display experiment tracer particle spreading device and belongs to the field of boundary layer near-wall region flow measurement. The device comprises a tracer particle generator, a smoke storage box and a wall surface particle dispersion box; smoke oil is pressurized by a micro pump in the trace particle generator and flows into a heating pipe to be heated and gasified, and the smoke oil is sprayed out from a nozzle to form trace particles. A smoke guide pipe enters a smoke storage box, an axial flow fan is mounted on the wall surface of the smoke storage box to adjust the flow speed of particles in the smoke storage box, then the smoke guide pipe enters a cavity of the wall surface particle dispersion box, rectification is carriedout by a rectifying plate, the particles are sprayed out from a spreading slit formed in a thin-wall cover plate, an included angle of 15 degrees is formed between an outlet of the slit and an experimental flat plate, and the