Experimental Research on Two-Dimensional Transonic Cascades of an 850-mm Steam Turbine Blade

1989 ◽  
Vol 111 (3) ◽  
pp. 231-235 ◽  
Author(s):  
Dafu Min ◽  
Xiaoyi Ai
Keyword(s):  
Experimental Data ◽  
Steam Turbine ◽  
Turbine Blade ◽  
Experimental Research ◽  
Aerodynamic Performance ◽  
Loading Capacity ◽  
Two Dimensional ◽  
Steam Turbine Blade ◽  
Dynamic Performances ◽  
Transonic Turbine

Aerodynamic experiments on three cascades of an 850-mm steam turbine blade have been performed. Several Schlieren photographs that give clear shock structures and dynamic performances at different Mach numbers have been obtained by a Schlieren-videcorder system. On the basis of the experimental data, we analyzed the generation and development of the shock patterns in the transonic turbine casade channel and their influence on the aerodynamic performance was analyzed. Through discussions and analysis, it is shown that these cascades characterize high loading capacity with satisfactory efficiency.

Improvement of Steam Turbine Blade Foil With Biomimetic Design and its Influence on Aerodynamic Performance

2019 ◽  
Author(s):  
Fan Wu ◽  
Danmei Xie ◽  
Jing Zhang ◽  
Hengliang Zhang ◽  
Chun Wang
Keyword(s):  
Steam Turbine ◽  
Turbine Blade ◽  
Vortex Pair ◽  
Separated Flow ◽  
Aerodynamic Performance ◽  
Steam Turbines ◽  
Structure Amplitude ◽  
Blade Shape ◽  
Steam Turbine Blade ◽  
Flow Vortex

Abstract To improve the steam turbines’ efficiency, researchers have put their efforts on blade foil design. Aiming at improve the aerodynamic performance of steam turbine at low load, this paper will study the effect of blade foil with bionics design on steam turbine aerodynamic performance, based on humpback whale’s fin. This paper mainly discusses a bionic foil design used on steam turbine. There are three main control parameters for each tubercle structure — amplitude, wavelength, and thickness. Taking the axial torque as the decisive consideration data and combining the vorticity diagram to analyze the flow, and on this basis, the influence of the vortex pair on the flow of the turbine blade is studied. The greater the torque, the stronger the function, so the steam turbines’ efficiency is higher. The flow condition of the optimized blade shape is improved compared to the original blade shape because it fits the blade more closely and the separated flow vortex is suppressed.

scholarly journals Failure Analysis in Lacing Wire Of Last Stage Low Pressure Steam Turbine Blade

2021 ◽  
Vol 1096 (1) ◽  
pp. 012097
Author(s):  
A M Kongkong ◽  
H Setiawan ◽  
J Miftahul ◽  
A R Laksana ◽  
I Djunaedi ◽  
...  
Keyword(s):  
Failure Analysis ◽  
Steam Turbine ◽  
Turbine Blade ◽  
Low Pressure ◽  
Pressure Steam ◽  
Steam Turbine Blade ◽  
Last Stage

Studies on Determination of Natural Frequencies of Industrial Turbine Blades

1995 ◽  
Author(s):  
Mahesh M. Bhat ◽  
V. Ramamurti ◽  
C. Sujatha
Keyword(s):  
Steam Turbine ◽  
Dynamic Behavior ◽  
Turbine Blade ◽  
Natural Frequencies ◽  
Complex Structure ◽  
Turbine Blades ◽  
Blade Root ◽  
Steam Turbine Blade ◽  
Manufacturing Tolerances

Abstract Steam turbine blade is a very complex structure. It has geometric complexities like variation of twist, taper, width and thickness along its length. Most of the time these variations are not uniform. Apart from these geometric complexities, the blades are coupled by means of lacing wire, lacing rod or shroud. Blades are attached to a flexible disc which contributes to the dynamic behavior of the blade. Root fixity also plays an important role in this behavior. There is a considerable variation in the frequencies of blades of newly assembled turbine and frequencies after some hours of running. Again because of manufacturing tolerances there can be some variation in the blade to blade frequencies. Determination of natural frequencies of the blade is therefore a very critical job. Problems associated with typical industrial turbine bladed discs of a 235 MW steam turbine are highlighted in this paper.

Failure analysis of the 350MW steam turbine blade root

2009 ◽  
Vol 16 (4) ◽  
pp. 1270-1281 ◽  
Author(s):  
J. Kubiak Sz ◽  
J.A. Segura ◽  
G. Gonzalez R ◽  
J.C. García ◽  
F. Sierra E ◽  
...  
Keyword(s):  
Failure Analysis ◽  
Steam Turbine ◽  
Turbine Blade ◽  
Blade Root ◽  
Steam Turbine Blade

Path Planning for Circular Cutter Envelop Milling of Steam Turbine Blade

2014 ◽  
Vol 989-994 ◽  
pp. 2908-2912
Author(s):  
Jian Jun Wang ◽  
Ke Wang ◽  
Qiong Wu
Keyword(s):  
Steam Turbine ◽  
Turbine Blade ◽  
Tool Path ◽  
Vertical Section ◽  
Surface Matching ◽  
Nurbs Surface ◽  
Processing Efficiency ◽  
Tool Paths ◽  
Blade Machining ◽  
Steam Turbine Blade

In order to solve the problem of poor steam turbine blade processing efficiency, and on the basis of analyzing the turbine blade surface and the existing processing methods, a model of circular cutter turbine blade machining is built. By comparing the tool paths of horizontal and vertical section envelope machining, choosing quasi-vertical cross section envelope machining method and utilizing the original datum and NURBS surface matching mathematic methods, this paper provides an algorithm of residual height calculating, and based on this, the tool path can be planned. Datum show that, the tool path of circular cutter machining blades is much longer than the tool path of ball-end cutter envelop milling machining blades, and the machining efficiency is also highly enhanced.

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