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research-article

COMPRESSOR INSTABILITY ANALYSIS WITHIN AN HYBRID SYSTEM SUBJECT TO CYCLE UNCERTAINTIES

[+] Author and Article Information
Alessandra Cuneo

University of Genoa, TPG, Genoa, Italy
alessandra.cuneo@edu.unige.it

Alberto Traverso

University of Genoa, TPG, Genoa, Italy
alberto.traverso@unige.it

Aristide Fausto Massardo

University of Genoa, TPG, Genoa, Italy
massardo@unige.it

1Corresponding author.

ASME doi:10.1115/1.4040687 History: Received June 22, 2018; Revised June 25, 2018

Abstract

The dynamic modeling of energy systems can be used for different purposes, obtaining important information both for the design phase and control system strategies, increasing the confidence during experimental phase. Such analysis in dynamic conditions is generally performed considering fixed values for both geometrical and operational parameters such as volumes, orifices, but also initial temperatures, pressure, etc. However, such characteristics are often subject to uncertainty, either because they are not known accurately or because they may depend on the operating conditions at the beginning of the relevant transient. With focus on a gas turbine fuel cell hybrid system, compressor surge may or may not occur during transients, depending on the aforementioned cycle characteristics; hence compressor surge events are affected by uncertainty. In this paper, a stochastic analysis was performed taking into account an emergency shut-down in a fuel cell gas turbine hybrid system, modelled with TRANSEO, a deterministic tool for the dynamic simulations. The aim of the paper is to identify the main parameters that impact on compressor surge margin. The stochastic analysis was performed through the Response Sensitivity Analysis method, a sensitivity-based approximation approach that overcomes the computational burden of sampling methods. The results show that the minimum surge margin occurs in two different ranges of rotational speed: a high-speed range and a low-speed range. The temperature and geometrical characteristic of the pressure vessel, where the fuel cell is installed, are the two main parameters that affect the surge margin during an emergency shut down.

Copyright (c) 2018 by ASME
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