Research Papers

Compressor Instability Analysis Within a Hybrid System Subject to Cycle Uncertainties

[+] Author and Article Information
Alessandra Cuneo, Alberto Traverso, Aristide F. Massardo

University of Genoa,
Via Montallegro 1,
Genova 16145, Italy

Manuscript received June 22, 2018; final manuscript received June 25, 2018; published online September 14, 2018. Assoc. Editor: Jerzy T. Sawicki.

J. Eng. Gas Turbines Power 141(1), 011006 (Sep 14, 2018) (9 pages) Paper No: GTP-18-1284; doi: 10.1115/1.4040687 History: Received June 22, 2018; Revised June 25, 2018

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. 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 (HS), 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 (ESD) in a fuel cell gas turbine HS, modeled 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 (RSA) 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 characteristics 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.

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Fig. 1

Schematic layout of a HS

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Fig. 2

Pictorial representation of the LGFCS HS

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Fig. 3

Schematics of the LGFCS HS emulator plant and TRANSEO model

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Fig. 4

Interaction between RSA method and TRANSEO model

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Fig. 5

Main model components

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Fig. 6

Trace on compressor maps in deterministic conditions (“nominal” trace in the map, which represent the “nominal” transient)

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Fig. 7

Sensitivity results for both rotational speed ranges

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Fig. 8

Trace on compressor map varying the OPV volume

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Fig. 9

Trace on compressor map varying the emergency bleed valve nominal mass flow

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Fig. 10

Trace on compressor map varying the turbine nominal mass flow

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Fig. 11

Trace on compressor map varying the purge line nominal mass flow

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Fig. 12

Trace on compressor map varying the OPV temperature

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Fig. 13

Trace on compressor map varying the thermal capacitance of the combustor

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Fig. 14

Trace on compressor map varying the rotor inertia



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