Test structure for simulating pre-rotation of leakage flow of dynamic and static disc cavities of turbine

Abstract

A test structure for simulating turbine dynamic and static disc cavity leakage flow pre-rotation comprises a gas collection cavity with a plurality of gas inlets, the gas collection cavity is communicated with a dynamic and static disc cavity gap, the dynamic and static disc cavity gap is communicated with a rim sealing structure, the rim sealing structure is located below a plane cascade test bed, and a pre-rotation structure is arranged on the top face of the rim sealing structure. Turbine moving blades are arranged on the plane cascade test bench, the pre-rotation structure is located on the upstream of the turbine moving blades, and leakage flow enters the gas collection cavity from the gas inlet, then enters a gap between the dynamic disc cavity and the static disc cavity, then flows through the rim sealing structure and the pre-rotation structure and enters a cascade channel of the plane cascade test bench. According to the invention, the problem that a static plane cascade test bench cannot simulate the prerotation phenomenon of the upstream leakage flow of the moving impeller disc is solved, and the influence of the rotational flow ratio of the leakage flow of the moving and static disc cavities on the cascade test result can be explored through the adjustment of the prerotation structure. The design of the dynamic and static disc cavity gap and the rim sealing structure refers to the actual turbine, so that the test result is closer to the actual turbine.

Description

technical field [0001] The invention belongs to the technical fields of flow, cooling and heat exchange of turbine blades of aero-engines, and in particular relates to a test structure for simulating the pre-swirl of the leakage flow of a dynamic and static disk cavity of a turbine. Background technique [0002] Gas turbines are widely used in industrial fields such as aviation propulsion, ship power, and land power generation due to their advantages such as high power density, small size, light weight, and fast start-stop speed. The increase of gas turbine inlet temperature is an inevitable trend in the development of gas turbines. While improving the thermal efficiency and specific work of the gas turbine cycle, it also leads to an increase in the thermal load on the hot end parts of the turbine, which leads to thermal fatigue and high temperature creep, which seriously affects The normal operation of parts and reduce their working life. Therefore, the research on the coo...

AI Technical Summary

Problems solved by technology

At present, the research on the flow, cooling and heat transfer characteristics of the leakage flow in the dynamic and static disc cavity has become a hot spot in the field, but it is difficult to effectively simulate the pre-swirl of the leakage flow in the gap between the dynamic and static disc cavity upstream of the moving impeller disc in the static planar cascade test bench. phenomenon, the test results are not convincing enough

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