High-load helium compressor cascade structure with self-suction function

Abstract

The invention provides a high-load helium compressor cascade structure with a self-suction function. The high-load helium compressor cascade structure comprises a compressor cascade, wherein the compressor cascade is an expanding and contracting type cascade, the cascade is expanded in a range from an inlet of the cascade to 70%-80% of a chord length, the cascade is contracted from an outlet of the cascade to the last 20%-30% of the chord length, a contraction structure of a compressor is positioned in a range of the last 20%-30% of a cascade chord length, air flow accelerates in a contractionchannel to produce a self-suction effect, and thus further development of a boundary layer is inhibited. According to the high-load helium compressor cascade structure with the self-suction function,under the condition that a tangential speed of a blade tip of a helium compressor does not change, the purpose of increasing the load is realized by increasing an axial speed and adopting larger negative pre-rotation. And meanwhile, the development of the boundary layer on a suction surface of the compressor is controlled by using the flow channel self-suction effect generated by the special flowchannel form of the design method, and separation of the suction surface is prevented, so that the compressor has good economy and stability under the condition of ultra-high load.

Description

technical field [0001] The invention relates to a compressor, in particular to a compressor blade cascade. Background technique [0002] The closed Brayton cycle with helium as the working fluid has obvious advantages in terms of economy, diversity of heat source selection and environmental protection. Solar power generation and other fields have broad application prospects, and will be one of the main power cycle methods for thermoelectric conversion in the future. However, due to the thermophysical characteristics of helium (large specific heat, high speed of sound, large isentropic index, etc.), it is difficult to be compressed. A helium compressor designed based on the experience of general air compressors requires many stages to obtain a low pressure ratio and low compression efficiency. Contents of the invention [0003] The purpose of the present invention is to reduce the number of stages of the helium gas turbine, improve the power density of this closed Brayton...

AI Technical Summary

Problems solved by technology

However, due to the thermal properties of helium (large specific heat, high speed of sound, large isentropic index, etc.), it is difficult to be compressed

The helium compressor designed based on the experience of general air compressors needs many stages to obtain a low pressure ratio and low compression efficiency

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