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Research Papers: Gas Turbines: Cycle Innovations

Experimental Dynamic Analysis on a T100 Microturbine Connected With Different Volume Sizes

[+] Author and Article Information
M. L. Ferrari

DIME, Thermochemical Power Group (TPG),
University of Genoa,
Genova 16145, Italy
e-mail: mario.ferrari@unige.it

P. Silvestri, F. Reggio

DIME,
University of Genoa,
Genova 16145, Italy

M. Pascenti, A. F. Massardo

DIME, Thermochemical Power Group (TPG),
University of Genoa,
Genova 16145, Italy

1Corresponding author.

Contributed by the Cycle Innovations Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 7, 2017; final manuscript received July 11, 2017; published online October 3, 2017. Editor: David Wisler.

J. Eng. Gas Turbines Power 140(2), 021701 (Oct 03, 2017) (12 pages) Paper No: GTP-17-1319; doi: 10.1115/1.4037754 History: Received July 07, 2017; Revised July 11, 2017

This paper shows experimental results obtained from a T100 microturbine connected with different volume sizes. The activity was carried out with the test rig developed at the University of Genoa for hybrid system emulation. However, these results apply to all the advanced cycles where a microturbine is connected with an additional external component responsible for volume size increase. Even if the tests were performed with a microturbine, similar analyses can be extended to large size turbines. A modular vessel was used to perform and to compare the tests with different volume sizes. To highlight the volume size effect, preliminary experimental results were carried out considering the transient response due to an on/off bleed valve operation. So, the main differences between system parameters obtained for a bleed line closing operation are compared considering three different volume sizes. The main results reported in this paper are related to surge operations. To produce surge conditions in this test rig, a valve operating in the main air path was closed to generate unstable behavior for the three different volume sizes. Particular focus was devoted to the operational curve plotted on the compressor map. The vibration frequency analysis showed significant amplitude increase not only during surge events but also close to the unstable condition. In details, possible surge precursor indicators were obtained to be used for the detection of risky machine operations. The experimental data collected during these tests are analyzed with the objective of designing control systems to prevent surge conditions.

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Figures

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Fig. 2

Test rig general picture (a) and removal of three module pipes in the modular vessel (b)

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Fig. 3

Vibration and acoustic sensor placement on the microturbine: (a) internal vane in the T100 case, (b) instrumentation installed on the electrical generator, and (c) acquisition system for vibration and acoustic data

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Fig. 4

VBE closing step: recuperator inlet pressure (a) and rotational speed (b)

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Fig. 5

VBE closing step: combustor inlet mass flow rate (a) and pressure losses between the recuperator and the combustor inlet ducts (b)

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Fig. 6

VBE closing step: TOT (a) and net electrical power (b)

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Fig. 7

VBE closing step: transient operation on the compressor map (each compressor curve is plotted for the same N/N0 value)

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Fig. 8

VBE closing step: surge margin

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Fig. 9

Main line valve closing: pressure losses between the recuperator and the combustor inlet ducts (a), surge approaching on the compressor map (each compressor curve is plotted for the same N/N0 value) (b) and rotational speed (c)

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Fig. 10

Main line valve closing: net electrical power

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Fig. 11

Main line valve closing: combustor inlet mass flow rate (a) and recuperator inlet pressure (b)

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Fig. 12

Main line valve closing: TOT

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Fig. 13

Main line valve closing: surge events on the compressor map (each compressor curve is plotted for the same N/N0 value)

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Fig. 14

Main line valve closing: surge margin

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Fig. 15

Main line valve closing: vibration time frequency analysis during surge transient (zoomed map)

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Fig. 16

Main line valve closing: RMS values versus time in surge approaching for the over-all signal (line A), the subsynchronous content (line B) and a specific subsynchronous band between 550 Hz and the 650 Hz (line C)

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Fig. 17

Main line valve closing: subsynchronous signal trends of the axial accelerometer component for different values of the additional volume

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Fig. 18

Main line valve closing: 40 kHz signal trends of the high-frequency radial (Z), axial (X) accelerometers and 54 kHz signal trend of the microphone

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Fig. 19

Main line valve closing: subsynchronous, average and envelope vibrational spectrum far from the surge (a) and few instants before reaching surge (b) in axial direction for a configuration with an additional volume equal to 2.3 m3 (1X indicates the synchronous frequency in both cases)

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Fig. 20

Main line valve closing: phase plane calculated through the axial acceleration signal considering single and double integration in two different instants far (a) and near (b) to the surge event with the three different volume sizes

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Fig. 21

Main line valve closing: information dimension trend varying the distance in seconds from the surge (from the pseudo phase planes)

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