The invention provides a swirling
flood discharge tunnel for improving the flow state of water, comprising a diversion tunnel, a transition section, a vortex chamber, a vertical shaft, a stilling
pool, a water baffle and a diversion tunnel, and the upstream of the transition section is connected with the diversion tunnel, The upstream of the
water diversion tunnel is connected with a
sluice chamber; the downstream of the transition section is connected with the vortex chamber, the lower end of the vortex chamber is connected with the vertical shaft through the vertical shaft connecting section, the stilling
pool is located at the bottom end of the vertical shaft, and the vortex chamber is located at the bottom of the vertical shaft. The
diameter is larger than the
diameter of the shaft, and the
diameter of the shaft is larger than the diameter of the stilling
pool; the lower part of the shaft is connected with the diversion hole through the connecting section, and one end of the diversion hole is blocked; the water baffle is arranged at the end of the connecting section. In the present invention, the transition section from the
water diversion tunnel to the vortex chamber forms a gradient, which can cause an increase in the velocity of the
water flow entering the vortex chamber. The invention changes the flow state through the water baffle at the end of the connecting section, so that the
water flow regularly flows into the diversion hole, thus ensuring that the inner wall of the diversion hole will not be eroded by excessive
water flow, and improving the service life of the diversion hole.