W-shaped rib channel cooling structure suitable for turbine blade backside cooling cavity

Abstract

The invention discloses a W-shaped rib channel cooling structure suitable for a turbine blade backside cooling cavity and belongs to the field of turbomachinery design. The structure comprises a blade backside cooling cavity, inclined diversion fins, linear diversion fins and flow blocking fins; a plurality of rows of inclined diversion fins on the inner wall of the blade backside cooling cavity are distributed in a W-shaped manner; the linear diversion fins are arranged in a space between the last row of inclined diversion fins and blade tailing edge split seam; and a W-shaped cooling channel is formed by a space defined by the inclined diversion fins, linear diversion fins and the inner wall of the blade backside cooling cavity. According to the W-shaped rib channel cooling structure, the W-shaped rib channel cooling structure is arranged in the blade backside cooling cavity, the rib channel has diversion and acceleration effects on an inner fluid, and simultaneously the blades are reinforced with the arrangement of W-shaped fins. Besides, the structure is simple and reasonable in design, and is suitable for the internal cooling system of turbine blades of a gas turbine.

Description

technical field [0001] The invention relates to a cooling structure inside a gas turbine blade, in particular to a W-shaped rib channel cooling structure suitable for a cooling cavity at the rear of the turbine blade. Background technique [0002] With the development of modern gas turbine technology, higher requirements are put forward for the increase of turbine inlet temperature. How to improve the heat resistance of turbine blades is a key research direction in the field of gas turbine turbine design. At present, there are two main measures to improve the heat resistance of turbines. One is to develop new heat-resistant blade materials and coating materials, and the other is to study more effective turbine blade cooling structures. Compared with the second method, the first method has high research and development costs and a long period. Therefore, designing a more efficient turbine blade cooling structure is of great significance for further improving the heat resistan...

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Problems solved by technology

[0003] After searching the existing technical literature, it is found that the Chinese patent application number is 200710118763.6, and the patent name is: a trapezoidal interlaced rib cooling blade suitable for gas turbine engines. The internal cooling cavity of the blade is covered with trapezoidal interlaced ribs, and the cooling fluid In the staggered rib channel formed between the staggered ribs, it flows alternately at 180° to the direction of the trailing edge of the blade. This cooling method can greatly increase the contact area between the cooling fluid and the solid, and at the same time, it can well increase the turbulence of the cooling fluid. degree, to enhance the heat exchange effect, but when the fluid flows in the cooling structure, it needs to flow back and forth at 180°, its flow resistance is extremely high, and the fluid will form a series of separated vortex clusters when it turns and flows, and the flow loss is large. At the same time The chaotic separation of vortex clusters will cause the heat transfer between the fluid inside the blade and the solid wall to be mainly convective heat transfer, and it is difficult to form impingement cooling and other cooling effects that require relatively consistent fluid flow.

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