This invention belongs to the field of radial turbines, specifically relating to a leakage prevention structure and a
radial turbine. One leakage prevention structure includes a first inlet
pipe, a first outlet
pipe, and a second outlet
pipe; the outlet of the first inlet pipe is connected to the inlet of the first outlet pipe and the inlet of the second outlet pipe, respectively; the leakage prevention structure is installed at the tip of the moving blade, allowing pressure-side fluid to enter the first inlet pipe, fluid ejected from the first outlet pipe to act within the gap, and fluid ejected from the second outlet pipe to act on the suction side. The leakage prevention structure of this invention can introduce pressure-side fluid into the gap and suction side, thereby reducing blade load; on the other hand, the fluid flowing into the gap significantly increases the
leakage flow resistance, reducing the
leakage flow rate; the fluid flowing into the suction side impacts the leakage vortex, weakening the leakage vortex intensity and further reducing the
leakage flow rate; thus, it has the effect of weakening the leakage vortex intensity, reducing losses, and improving
turbine efficiency.