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A Nozzle Diaphragm Structure for Reducing the Exciting Force of Low-Frequency Air Flow in the Regulating Stage of Turbomachinery

A technology of airflow excitation force and nozzle baffle, which is applied in the direction of mechanical equipment, engine components, machines/engines, etc., can solve the problems of large airflow excitation force of moving blades and uneven airflow, so as to improve airflow force load and reduce The effect of changing amplitude and reliable technical support

Inactive Publication Date: 2015-10-28
XI AN JIAOTONG UNIV
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem is that there is serious airflow inhomogeneity between the steam inlet section and the non-steam inlet section, and there is a sharp increase and sudden drop in the airflow force when the rotor blade enters the steam inlet section and leaves the steam inlet section, so the rotor blade is subjected to a large airflow shock. Vibration force

Method used

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  • A Nozzle Diaphragm Structure for Reducing the Exciting Force of Low-Frequency Air Flow in the Regulating Stage of Turbomachinery
  • A Nozzle Diaphragm Structure for Reducing the Exciting Force of Low-Frequency Air Flow in the Regulating Stage of Turbomachinery
  • A Nozzle Diaphragm Structure for Reducing the Exciting Force of Low-Frequency Air Flow in the Regulating Stage of Turbomachinery

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] Before introducing the present invention, it is necessary to briefly introduce the structure of the conventional nozzle baffle and the mechanism of low-frequency exciting force generated by part of the inlet steam turbine machinery, which is helpful for the understanding of the present invention.

[0018] see figure 1 , is a schematic diagram of the structure of a conventional nozzle diaphragm. The interface between the non-steam inlet section and the steam inlet section is a straight line, and the airflow force on the moving blade completes the transition from the steam inlet section to the non-steam inlet section or from the non-steam inlet section to the steam inlet section in a relatively short period of time.

[0019] see figure 2 , is a schematic diagram of part of the inlet steam turbomachinery. The moving blade rotates in the circumferential directio...

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Abstract

The invention discloses a nozzle partition plate structure for reducing adjusting-stage low-frequency airflow exciting force of a turbine machine. The outer contour of the section of the nozzle partition plate structure comprises an outer circular arc and an inner circular arc concentric with each other, wherein the two ends of the outer circular arc and the inner circular arc are connected with curved sections through symmetric straight sections; one ends of the curved sections are tangential to the inner circular arc, and the other ends of the curved sections are connected with one ends of the straight sections; and the other ends of the straight sections are connected with the inner circular arc. As the nozzle partition plate structure is improved, steam is fed in a smooth curve manner in a transition region of a steam inlet section and a non-steam inlet section, the increment of dynamic stress load of a blade due to excessive airflow impact caused by acute steam feeding and sudden leaving from a steam inlet arc section of a movable blade can be reduced, and the adjusting-stage low-frequency airflow exciting force is reduced. The nozzle partition plate structure has the advantages of clear principle, simple structure and convenience for production, and is suitable for being applied to multiple turbine machine adjusting stages.

Description

【Technical field】 [0001] The invention belongs to the technical field of steam turbines, and in particular relates to a nozzle baffle structure for reducing the exciting force of low-frequency air flow in a turbomachinery adjustment stage. 【Background technique】 [0002] Fatigue fracture damage of blades has a large proportion of accidents in steam turbine units, and the forced vibration of blades caused by low-frequency excitation force is an important cause of blade failure in turbomachinery. The internal flow field of the partial steam inlet regulating stage is more complex than that of the full-circumference steam inlet, and the airflow excitation factor caused by it is much larger than that of the full-circumference steam inlet turbine stage, so the low-frequency airflow excitation force caused by the partial steam inlet is reduced It is of great significance, and it is also an important means to ensure the safe and stable operation of the unit. [0003] Such as figur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D9/02F01D25/04
Inventor 谢永慧高科科张荻
Owner XI AN JIAOTONG UNIV
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