Low-flowing-pressure-loss special-shaped gradient exhaust structure

Abstract

The invention provides a low-flowing-pressure-loss special-shaped gradient exhaust structure. The low-flowing-pressure-loss special-shaped gradient exhaust structure is composed of an air collecting shell, a special-shaped gradient exhaust pipe and an exhaust shell flange. An oval-like inlet of the exhaust pipe is designed through the flow characteristics in a steam turbine, so that the situationthat clearance leakage flow, steam exhaust obtained after acting and other steam directly collide with the wall face of the air collecting shell to cause flow losses is avoided, by means of the passageway gradient form design, losses in the mixing process are reduced, the low-flow exhaust effect of the small-working-medium-flow steam turbine is achieved, by means of the passageway design of the structure, exhaust pressure losses are reduced, the back pressure of the steam turbine is reduced, internal flow is improved, an exhaust section is compact, and the low-flowing-pressure-loss special-shaped gradient exhaust structure can be used for closed circulation steam turbine power in the underwater environment, the air-space environment and other special environments.

Description

technical field [0001] The invention relates to the technical field of steam turbine exhaust structure for closed cycle power with small working fluid flow, in particular to a special-shaped gradual exhaust structure with low flow pressure loss. Background technique [0002] Closed cycle power steam turbines with small working fluid flow in underwater, space and other special environments are very different from ordinary steam turbines. They are characterized by high wheel speed, large nozzle expansion ratio, single-stage pure impulse It has the characteristics of low gas rate, large relative blade tip clearance, and high exhaust steam velocity at the outlet of moving blades. [0003] The steam turbine power system is extremely sensitive to the back pressure of the steam turbine; if the back pressure is too high, the flow condition in the steam turbine channel will become poor, the flow loss will increase, the heat power conversion capacity will decrease, the waste heat at t...

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Problems solved by technology

[0006] At present, there is no public literature that proposes relevant schemes for the exhaust structure design of single-stage pure impulse steam turbines in a limited space.

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