Experimental facility of upper long-radius elbow effect

The utility model relates to an experimental facility of upper long-radius elbow effect, comprising a bottom plate, a front low-side plate, a plurality of rear high-side plates and a plurality of groove strips; the front low-side plate is vertically arranged at one side of the bottom plate, a plurality of the rear high-side plates are vertically arranged at two sides of the bottom plate and are vertical to the front low-side plate, the groove strips are arranged above the bottom plate, all sides of the bottom plate are connected with the front low-side plate and a plurality of the rear high-side plates, the bottom plate is square and is arranged horizontally, the front low-side plate is cuboid, three semi-circle grooves are arranged at the top part, a plurality of the rear high-side plates are ladder-shaped, the height of the ladder is laminated to one side of the bottom plate, the short side thereof is connected with the front low-side plate, a plurality of the groove strips are semi-circular, one end of the