Rotary variable spray nozzle partial-air admission radial flow turbine

Abstract

The invention provides a rotary variable spray nozzle partial-air admission radial flow turbine. The rotary variable spray nozzle partial-air admission radial flow turbine comprises a volute, a spraynozzle and an air admission disc. The spray nozzle and the air admission disc are contained in the volute, the spray nozzle is fixed in the volute and comprises an annular body and a plurality of spray nozzle blades. The annular body comprises a side surface, and the spray nozzle blades protrude out of the side surface of the annular body in the axial direction, are arranged on the side surface atintervals in the circumferential direction and form a plurality of air guide areas with different circulating areas. The air admission disc is arranged on the periphery of the spray nozzle in a sleeving mode in the radial direction, an opening is formed in the air admission disc in the peripheral direction, and the air admission disc can rotate in the circumferential direction to make the openingbe radially opposite to the corresponding air guide area of the spray nozzle. The rotary variable spray nozzle partial-air admission radial flow turbine has good full work condition performance and solves the problem that in the prior art, the efficiency is greatly reduced when a turbine works in variable working conditions.

Description

technical field [0001] The invention relates to the field of impeller machinery, in particular to a rotary variable nozzle partial intake radial 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, in the circulation system of low power level, the volume flow rate of supercritical carbon dioxide working medium at the turbine inlet is small, which will cause the nozzle blade blade height to be small, causing the performance of the turbine to decline, and some The structure of th...

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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 inlet radial flow turbine, which can change the flow area of ​​the nozzle according to different working conditions and improve the efficiency of the partial inlet radial flow turbine. performance under different working conditions, and solve the problem of sharp drop in efficiency when the turbine works under variable working conditions in the prior art

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