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Technical Brief

A Detailed Modular Governor-Turbine Model for Multiple-Spool Gas Turbine with Scrutiny of Bleeding Effect

[+] Author and Article Information
Hossein Balaghi Enalou

University of Nottingham
Hossein.BalaghiEnalou@nottingham.ac.uk

Eshagh Abbasi Soreshjani

MAPNA Turbine Engineering & Manufacturing Company (TUGA)
abbasi.eshagh@mapnaturbine.com

Mohamed Rashed

University of Nottingham
Mohamed.Rashed@nottingham.ac.uk

Seang Shen Yeoh

University of Nottingham
eexssye@nottingham.ac.uk

Serhiy Bozhko

University of Nottingham
Serhiy.Bozhko@nottingham.ac.uk

1Corresponding author.

ASME doi:10.1115/1.4036947 History: Received September 12, 2016; Revised April 25, 2017

Abstract

Multiple spool gas turbines are usually utilized for power supply in aircrafts, ships and terrestrial electric utility plants. As a result, having a reliable model of them can aid with the control design process and stability analysis. Since several interconnected components are coupled both thermodynamically and through shafts, these engines cannot be modelled linearly as single shaft gas turbines. In this paper, inter component volume method (ICV) has been implemented for turbine modelling. A switched feedback control system incorporating bump-less transfer and anti-windup functionality is employed as governor for the engine. Validation with test results from a three spool gas turbine highlights high accuracy of turbine-governor model in various maneuvers. Results show that over-speed after load rejection is considerable due to the fact that in this arrangement, the power turbine is not coupled with the compressor which acts like a damper for single shaft gas turbines. To address this problem, bleed valves (mainly before combustion chamber) are used to arrest the over-speed by 20 per cent. In addition, a switch is employed into the governor system to rapidly shift fuel to permissible minimum flow.

Copyright (c) 2017 by ASME
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