Centripetal turbine blade back small wing structure capable of inhibiting clearance leakage

Abstract

The invention discloses a centripetal turbine blade back small wing structure used for a turbocharger of an aviation piston engine. Small wings are constructed at the back of an opened centripetal turbine blade, and three implementation forms of the small wings are as follows: constructing one small wing on a suction surface of the back of the blade, constructing one small wing on a pressure surface, and constructing the rest small wings respectively at the two sides of the blade. The centripetal turbine blade back small wing structure has the advantages that (1) the small wing on the pressure surface of the back is capable of effectively inhibiting gas being leaked onto the suction surface of the blade through gaps at the back of a turbine from the pressure surface of the blade, so that leakage loss is reduced, and the efficiency of the turbine is improved; (2) the small wing on the suction surface is capable of effectively inhibiting vortex being generated near the gaps of the blade back of the suction surface, so that the actual acting ability of the blade is improved; (3) the small wings at the two sides of the blade can integrate the advantages of the small wing on the suction surface and the small wing on the pressure surface, and the weight of the turbine and the blade back friction loss are slightly increased, so that the turbine efficiency is improved on the whole.

Description

technical field [0001] The invention relates to the technical field of aero-piston engine turbocharging, and relates to the aerodynamic design, heat transfer and structural design of a centripetal turbine, in particular to a centrifugal turbine with a winglet structure on the back of a turbine blade that suppresses gap leakage and improves the efficiency of a centripetal turbine. Heart Turbo. Background technique [0002] The turbine stage of the turbocharger works in a high temperature environment, and the blades and discs bear a lot of aerodynamic and centrifugal forces at high speeds. Under the premise of ensuring the stable and reliable operation of the turbocharger, how to improve the efficiency of the turbine is aerodynamic design. a challenge. [0003] The centripetal turbine has the characteristics of simple structure, low cost and high single-stage pressure ratio, and the open type centripetal turbine is a typical structure. On the basis of the conventional turbin...

AI Technical Summary

Problems solved by technology

[0004] The open radial turbine has advantages in strength and weight, but introduces a new loss in aerodynamics, that is, the leakage loss of the blade back clearance

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