An Experimental and Numerical Study of the Effects of Flow Incidence Angles on the Performance of a Stator Blade Cascade of a High Pressure Steam Turbine

This study aims at quantifying the effects of off-design operation on the aerodynamic performance of a high deflection steam turbine blade linear cascade. The flow incidence on the leading edge of the blades was varied from −15.3° to +21.0° while comprehensive measurements of the resulting flow-fields upstream and downstream of the test section were conducted. This allowed calculating the profile loss coefficient which proved to be insensitive to flow incidence. The experimental results were found to be in good agreement with the output from an in-house numerical investigation using a commercial CFD package.

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

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1096/1/012097 ◽

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

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Numerical Study Analysis of The Effect of Trailing Edge Thickness of Low-Pressure Steam Turbine Stator on Steam Condensation

10.1109/ies53407.2021.9593946 ◽

2021 ◽

Author(s):

Gilang Muhammad ◽

Lohdy Diana ◽

Achmad Bahrul Ulum

Keyword(s):

Steam Turbine ◽

Numerical Study ◽

Low Pressure ◽

Study Analysis ◽

Steam Condensation ◽

Trailing Edge ◽

Turbine Stator ◽

Pressure Steam

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Simulation of Unsteady Flows in Intermediate Pressure Steam Turbine with Cutback Stator Blade Row

The Proceedings of Mechanical Engineering Congress Japan ◽

10.1299/jsmemecj.2020.j05102 ◽

2020 ◽

Vol 2020 (0) ◽

pp. J05102

Author(s):

Hironori MIYAZAWA ◽

Akihiro UEMURA ◽

Takashi FURUSAWA ◽

Satoru YAMAMOTO ◽

Shuichi UMEZAWA ◽

...

Keyword(s):

Steam Turbine ◽

Unsteady Flows ◽

Intermediate Pressure ◽

Blade Row ◽

Pressure Steam ◽

Stator Blade

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Detailed Numerical Study of the Main Sources of Loss and Flow Behavior in Low Pressure Steam Turbine Exhaust Hoods

Volume 8: Microturbines, Turbochargers and Small Turbomachines; Steam Turbines ◽

10.1115/gt2017-63269 ◽

2017 ◽

Author(s):

Dickson Munyoki ◽

Markus Schatz ◽

Damian M. Vogt

Keyword(s):

Steam Turbine ◽

Numerical Study ◽

Flow Behavior ◽

Low Pressure ◽

Operating Conditions ◽

Pressure Recovery ◽

Exhaust Hood ◽

Recovery Coefficient ◽

Pressure Steam ◽

Underlying Mechanisms

The performance of the axial-radial diffuser downstream of the last low-pressure steam turbine stages and the losses occurring subsequently within the exhaust hood directly influences the overall efficiency of a steam power plant. It is estimated that an improvement of the pressure recovery in the diffuser and exhaust hood by 10% translates into 1% of last stage efficiency [11]. While the design of axial-radial diffusers has been the object of quite many studies, the flow phenomena occurring within the exhaust hood have not received much attention in recent years. However, major losses occur due to dissipation within vortices and inability of the hood to properly diffuse the flow. Flow turning from radial to downward flow towards the condenser, especially at the upper part of the hood is essentially the main cause for this. This paper presents a detailed analysis of the losses within the exhaust hood flow for two operating conditions based on numerical results. In order to identify the underlying mechanisms and the locations where dissipation mainly occurs, an approach was followed, whereby the diffuser inflow is divided into different sectors and pressure recovery, dissipation and finally residual kinetic energy of the flow originating from these sectors is calculated at different locations within the hood. Based on this method, the flow from the topmost sectors at the diffuser inlet is found to cause the highest dissipation for both investigated cases. Upon hitting the exhaust hood walls, the flow on the upper part of the diffuser is deflected, forming complex vortices which are stretching into the condenser and interacting with flow originating from other sectors, thereby causing further swirling and generating additional losses. The detailed study of the flow behavior in the exhaust hood and the associated dissipation presents an opportunity for future investigations of efficient geometrical features to be introduced within the hood to improve the flow and hence the overall pressure recovery coefficient.

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