Porous medium tail plate of suction type plane cascade test bed

The invention discloses a porous medium tail plate of a suction type plane cascade test bed, the tail plate comprises a rotatable straight tail plate with a round rod and a porous medium, the porous medium adopts a non-metallic material or a foam material prepared by taking metal and alloy thereof as raw materials, and the surface of the straight tail plate is completely wrapped with the porous medium; and the tail edge of the blade grid is just contacted. The porous medium is an isotropic porous medium material with 35-55 PPI and the porosity of 75-85%, the thickness of the porous medium is 3-10 mm, and the porous medium is tightly attached to the surface of the straight tail plate without gaps. The original straight plate is covered with the porous medium material, so that the thickness of a boundary layer of a near-wall area of the cascade tail plate is reduced, the characteristic that the total pressure of a cascade outlet is distributed periodically in the cascade direction is remarkably improved, and th