A special-shaped slot cooling structure with improved end wall cooling efficiency

Abstract

The invention discloses a slot cooling structure capable of improving the cooling efficiency of the end wall of the stator blade channel. The upstream boundary of the slot cooling structure at the slot exit of the slot cooling structure and the downstream boundary of the slot cooling structure are opposite in phase, period and amplitude The shape of the cosine function is the same, and the period of the cosine function of the upstream boundary of the slot cooling structure and the downstream boundary of the slot cooling structure are equal to the pitch of the stationary blade cascade. When the actual gas turbine is working, the outlet area of ​​the slot cooling structure of the present invention changes continuously along the pitch direction according to a certain rule, so the cooling jet introduced from the compressor is redistributed when it enters the jet slot to overcome the pressure caused by the change of the external flow field pressure. Inhomogeneous distribution of the cooling jet at the exit of the slot. The slot cooling structure of the invention makes the distribution of the cooling jet at the outlet of the slot more uniform, and expands the coverage area of ​​the cooling jet on the downstream end wall, so the slot cooling jet can be close to the end wall to carry out the cooling on the end wall of the downstream vane passage. Adequate cooling protection.

Description

technical field [0001] The invention relates to an end wall slot cooling structure, in particular to a special-shaped slot cooling structure between a gas turbine combustion chamber and a turbine with improved end wall cooling efficiency. Background technique [0002] With the adjustment of the energy structure, gas turbines, as the main device for energy conversion and utilization, are widely used in civil power generation, aviation industry, chemical industry and mechanical power fields due to their high thermal power conversion efficiency. The rapid development of social economy has led to a sharp increase in energy demand and increasingly prominent environmental problems. As the main power generation equipment, the power and thermal efficiency of gas turbines have been continuously improved, and increasing the gas temperature is the most direct and effective way to increase the power and efficiency of gas turbines. However, this puts more stringent requirements on the co...

AI Technical Summary

Problems solved by technology

The traditional slot cooling structure 8 and the air film hole 9 cooling structure can improve the cooling efficiency of the end wall near the leading edge of the vane to a certain extent. The distribution is uneven, so that the vane channel end wall 10 area near the leading edge of the vane and the pressure surface side still cannot receive sufficient cooling protection

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