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research-article

Energy Loss on Fractional Deposition in Last Stages of Condensing Steam Turbine due to Blade Shape and Moisture Droplet Size

[+] Author and Article Information
Bidesh Sengupta

Assistant Professor, Modern Institute of Engineering & Technology, Hooghly, West Bengal; India
bideshsengupta.08@gmail.com

Chittatosh Bhattacharya

Associate Professor, National Power Training Institute; Eastern Region, Durgapur, India
chittatoshbhattacharya@asme.org

1Corresponding author.

ASME doi:10.1115/1.4038544 History: Received June 11, 2017; Revised October 12, 2017

Abstract

The steam consumption in a turbine within an operating pressure range determines the effectiveness of thermal energy conversion to electric power generation in a turbo-alternator. The low pressure (LP) stage of the steam turbine produces largest amount of steam to shaft-power in comparison to other stages of turbine although susceptible to various additional losses due to condensation of wet steam near penultimate and ultimate stages. The surface deposition in blade is caused by inertial impaction and turbulent-diffusion. With increasing blade stagger angle along the larger diameter of blading, the fractional deposition of wet steam is largely influenced by blade shape. From this background, the aim of this work is to predict the effect of mathematical models through CFD analysis on the characterization of thermodynamic and mechanical loss components based on unsaturated vapor water droplet size and pressure zones in lowest pressure stages of steam turbine and to investigate the influence of droplet size and rotor blade profile on cumulative energy losses due to condensation and provide an indication about the possible conceptual optimization of blade profile design to minimize moisture induced energy losses.

Copyright (c) 2017 by ASME
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