A spindle -shaped gas -like gas -like gas -like gas -like air system for the secondary air system of the gas turbine

Abstract

The present invention relates to a spindle-shaped air bleed structure used in a secondary air system of a gas turbine, comprising a two-stage rotor disk, a spindle-shaped bleed air structure and an air bleed disc. The two-stage rotor disc and the spindle-shaped air bleed structure are set on the air bleed disc. The air inlet hole on the rotor disc is facing the tip of the spindle-shaped air bleed block, and the air bleed hole on the spindle-shaped air bleed structure is directly on the air bleed disc. air duct. During operation, the main flow of fluid enters the disk cavity area through the air inlet holes on the first-stage rotor disk along the radial direction. Air flow in the disc cavity is guided by a spindle-shaped air bleed block through a tapered-expanded channel through the disc cavity area. Then the air flow enters the air outlet hole on the fixed plate along the radial direction, and the air outlet hole is facing the air induction groove on the air induction plate. The air flow turns in the direction of flow in the air duct and is drawn out in the axial direction. By selecting reasonable structural parameters, the bleed air structure is suitable for different working conditions. The present invention has the advantages of high efficiency, low resistance, compact structure, suitable for high rotation speed and the like, and has broad market prospects.

Description

technical field [0001] The invention relates to a spindle-shaped air bleed structure used in a secondary air system of a gas turbine, which is used for reducing the eddy current in the interstage disc cavity of the gas turbine. Background technique [0002] For the gas turbine cycle, increasing the inlet temperature of the turbine can improve the operating efficiency and power of the stage, but it also leads to high thermal stress on the hot end components of the turbine, which often exceeds the temperature range that the material can withstand. High-efficiency cooling technology The research of gas turbine is in urgent need of development. At present, film cooling is one of the most effective cooling methods for gas turbines. The low-temperature gas required for film cooling is generally extracted from the front-end component, that is, the main stream of the compressor, through the air bleed device arranged between the discs. The pressure of the mainstream working medium o...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a spindle-shaped bleed air structure for the secondary air system of a gas turbine to solve the problems of large bleed air resistance of a gas turbine, complex structure of an ordinary bleed air, and insufficient strength and vibration performance at high speeds

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