A diffuser end wall of a steam turbine exhaust system on one side

A diffuser and steam turbine technology, applied in the direction of machine/engine, mechanical equipment, engine components, etc., can solve the problem of not considering the aerodynamic interaction between the turbine and the exhaust system, so as to reduce the degree of circumferential unevenness and increase the permeability. The effect of leveling work and reducing back pressure

Active Publication Date: 2015-12-16
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

In the previous design of the end wall of the diffuser, the aerodynamic interaction between the turbine and the exhaust system was not considered, and an axisymmetric diffuser was formed by rotating a profiled line around the axis, and the exhaust system obtained in the actual environment The aerodynamic performance is quite different from the design value

Method used

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  • A diffuser end wall of a steam turbine exhaust system on one side
  • A diffuser end wall of a steam turbine exhaust system on one side
  • A diffuser end wall of a steam turbine exhaust system on one side

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Embodiment Construction

[0022] The diffuser end wall of a steam turbine unilateral exhaust system of the present invention is based on the strong aerodynamic interaction between the turbine blade row and the unilateral radial exhaust system, and proposes a new design idea and structural form . This design method proposes a full three-dimensional design of the end wall of the diffuser in the steam turbine exhaust system. In the design, according to the actual turbine outlet flow field, different meridian lines are used at different circumferential positions (see Figure 2a ), smoothly interpolate the profile lines along the circumferential direction to form the end wall profile of the diffuser (see Figure 2b ). This design method, in the actual operating environment, can not only ensure that the exhaust system has a good diffusion capacity, but also reduce the back pressure of the turbine outlet (see Table 1 and Figure 4 ), increase the turbine output and improve the thermal efficiency of the uni...

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Abstract

The invention provides a diffuser end wall of a turbine single-side exhaust system and relates to the technology of turbines. The end wall face adopts full three-dimensional modeling, different meridian lines at different circumferential directions are utilized to generate a non-axis-symmetrical full three-dimensional diffuser end wall curve. The diffuser end wall structure has the advantage that the end wall adapts to actual flow field distribution of a last stage turbine outlet, ensures that the exhaust system has good diffusion capability under the actual operation environment of a unit, turbine outlet back pressure is reduced, turbine power output is increased, unit heat efficiency is improved, and the end wall adapts to an exhaust volute conducting single-side radial exhausting, reduces circumferential flowing uneven degree in the single-side radial exhaust system, reduces last stage turbine blade load and fluctuation of air power in one circle and improves unit operation safety. The diffuser end wall structure mode is suitable for diffusers in all turbine exhaust systems conducting single-side radial exhausting.

Description

technical field [0001] The invention relates to the technical field of steam turbines, and relates to a diffuser end wall of a single-side steam exhaust system of a steam turbine. Background technique [0002] The single-side radial exhaust system of a large-power steam turbine is used as a flow-through part at the end of the flow channel to recover the residual velocity kinetic energy at the outlet of the final stage turbine, and reduce the exhaust pressure of the turbine under a given outlet pressure of the exhaust system. The back pressure of the turbine increases the output of the turbine and improves the thermal efficiency of the unit. In the case of unilateral radial exhaust, the steam flow turns about 90° from the turbine outlet to the exhaust system outlet, thus generating a non-axisymmetric flow field at the turbine outlet section, making the turbine blades rotate at different circumferences. Different back pressure is felt towards the position. At the same time, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D25/30
Inventor 付经伦刘建军周嗣京曾蕴涛崔永强蒋洪德
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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