Rotary-type variable nozzle partial-admission axial flow turbine

Abstract

The invention provides a rotary-type variable nozzle partial-admission axial flow turbine. The turbine comprises a case, a nozzle and an air inlet disc, wherein the nozzle and the air inlet disc are contained in the case; the nozzle is fixed to the case, and the nozzle comprises a ring body and a plurality of nozzle blades, wherein the ring body is provided with a circumferential face, the nozzleblades extend outwards from the circumferential face of the ring body to the inner wall of the case in the radial direction, and the plurality of nozzle blades are arranged on the circumferential faceat intervals in the circumferential direction and form a plurality of air guide areas with different flow areas; and the air inlet disc is arranged at the upstream portion of the nozzle, the air inlet disc is provided with a guide hole penetrating in the axial direction, and the air inlet disc can rotate in the circumferential direction so as to enable the guide hole to be opposite to the corresponding air guide areas of the nozzle in the axial direction. According to the rotary-type variable nozzle partial-admission axial flow turbine, the all-working-condition performance is good, and the problem that in the prior art, the efficiency is greatly reduced when a turbine works under variable working conditions is solved.

Description

technical field [0001] The invention relates to the field of impeller machinery, in particular to a rotary variable nozzle partial intake axial flow turbine. Background technique [0002] Due to its high cycle efficiency, small structure size, and wide operating temperature range, the supercritical carbon dioxide Brayton cycle has attracted extensive attention in the fields of solar and nuclear power generation, transportation power and other fields. As the only power output component in the cycle, the turbine is particularly important, and the performance of the turbine directly determines the performance of the overall system. [0003] Due to the high density of supercritical carbon dioxide, the volume flow rate of supercritical carbon dioxide working medium at the turbine inlet is often small in the circulation system of low power level, which will cause the nozzle blade height to be small, causing the performance of the turbine to decline, and some The structure of the ...

AI Technical Summary

Problems solved by technology

[0005] In view of the problems existing in the background technology, the object of the present invention is to provide a rotary variable nozzle partial intake axial flow turbine, which can change the flow area of ​​the nozzle according to different working conditions, and improve the efficiency of the partial intake axial flow turbine. The performance under variable working conditions solves the problem of a sharp decline in the efficiency of existing turbines when working under variable working conditions

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