Title:
METHOD FOR CALCULATING UNSTEADY FORCE ACTING ON ROTOR BLADE OR STATOR BLADE, TURBINE DESIGN TECHNIQUE AND TURBINE MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2013/027449
Kind Code:
A1
Abstract:
Provided is a turbine design method capable of easily constructing a turbine stage structure that reduces unsteady forces acting on the rotor blade and can prevent decreases in performance and increases in rotor axis length. For example, unsteady forces and excitation forces due to potential interactions that act on the rotor blade are each determined for multiple stator blade-rotor blade distances by viscometric analysis (21) and non-viscometric analysis (22). From differences in the viscometric analysis results and non-viscometric analysis results, excitation forces due to wake interactions that act on the rotor blade are determined. The respective excitation forces due to potential interactions and due to wake interactions are expressed mathematically (23) as functions of the stator blade-rotor blade distance. Based on the mathematically expressed excitation forces due to potential interactions and wake interactions, the unsteady force acting on the rotor blade when the stator blade-rotor blade distance is a chosen value is calculated (24). The stator blade-rotor blade distance is determined (30) based on the calculation results.
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Inventors:
TANAKA TOMOMI (JP)
SHIKANO YOSHIO (JP)
YAMASHITA YUTAKA (JP)
SHIKANO YOSHIO (JP)
YAMASHITA YUTAKA (JP)
Application Number:
PCT/JP2012/063111
Publication Date:
February 28, 2013
Filing Date:
May 23, 2012
Export Citation:
Assignee:
HITACHI LTD (JP)
TANAKA TOMOMI (JP)
SHIKANO YOSHIO (JP)
YAMASHITA YUTAKA (JP)
TANAKA TOMOMI (JP)
SHIKANO YOSHIO (JP)
YAMASHITA YUTAKA (JP)
International Classes:
F01D5/14; F01D9/02; G06F17/50
Foreign References:
| JPH0861001A | 1996-03-05 | |||
| JP2006046226A | 2006-02-16 | |||
| JP2006138250A | 2006-06-01 | |||
| JPH10149384A | 1998-06-02 |
Other References:
See also references of EP 2765275A4
Attorney, Agent or Firm:
POLAIRE I. P. C. (JP)
Polaire Intellectual Property Corporation (JP)
Polaire Intellectual Property Corporation (JP)
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Claims: