Experience in Full Load Testing Natural Gas Centrifugal Compressors for Rotordynamics Improvements

Gelin, A; Pugnet, Jean-Marc; Bolusset, D.; Friez, Patrick

doi:10.1115/96-gt-378

Cited by 12 publications

(3 citation statements)

References 3 publications

(1 reference statement)

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“…In 1990s, Memmott [18,19] employed a shunt injection method to solve problems of subsynchronous vibrations of high-parameter centrifugal compressors. Shunt injection has proven to be dynamically beneficial in many cases [20], but there have been some cases in which they were not satisfactory. In 1999, Soto and Childs [21] experimentally studied the effect of shunt injection on the dynamic characteristics of a 20-tooth labyrinth seal by removing the fourth tooth.…”

Section: Introductionmentioning

confidence: 99%

Improving the rotordynamic stability of short labyrinth seals using positive preswirl

Zhang¹,

Gu²,

Cao³

et al. 2020

J. vibroeng.

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Introducing a negative preswirl at the upstream of annular gas seals has been considered as an effective way to improve the system stability. This paper demonstrates a stability enhancement approach for a short labyrinth seal using positive preswirls. The static and dynamic characteristics of the labyrinth seal with various blade numbers (5, 10, 15), inlet preswirl ratios (-0.3,-0.15, 0, 0.15, 0.3) were studied. Results show that the inlet preswirl ratio has a dramatic effect on the circumferential location of the high-pressure spot for each seal cavity, particularly for the first cavity. The inlet preswirl ratio has opposite effects on the system stability due to the difference of high-pressure spot locations between the first cavity and the others. An increasing positive inlet preswirl could improve the system stability for the labyrinth seal with fewer blades (e.g. 5 blades). Its characteristics is mainly dominated by the first seal cavity. For the labyrinth seal with 10 blades, the system characteristics shows slight dependency on the inlet preswirl ratio. For the labyrinth seal with more blades (e.g. 15 blades), the negative inlet preswirl still increases the system stability, which agrees with the conventional conclusion. The paper provides a deeper understanding on the stability improvement of the labyrinth seal.

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Section: Introductionmentioning

confidence: 99%

Improving the rotordynamic stability of short labyrinth seals using positive preswirl

Zhang¹,

Gu²,

Cao³

et al. 2020

J. vibroeng.

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“…Reports by Zeidan et al [31], Sorokes et al [25] and Gelin et al [8] show that a damper seal can be used to increase the compressor stability. This component has high damping coefficient, but it can also have high stiffness, which can affect the critical speed position and the equipment's unbalance response, as reported by Noronha et al [23], Baldassarre et al [2,3].…”

Section: Introductionmentioning

confidence: 99%

Impact of damper seal coefficients uncertainties in rotor dynamics

Timbó

Ritto

2019

J Braz. Soc. Mech. Sci. Eng.

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Damper seals might have a great impact on rotordynamics, but the values of their coefficients are difficult to be determined and have a significant uncertainty. In the present paper, a probabilistic model is proposed to model damper seal coefficients, which are frequency dependent. A stochastic process (frequency indexed) is constructed such that modeling errors are taken into account. The impact of these uncertainties on the rotordynamic behavior of a compressor is analyzed. The deterministic seal coefficients are determined considering a bulk-flow model, and values are calculated by a compressor manufacturer based on experimental data. The results obtained show that uncertainties in these coefficients have a considerable impact on the compressor Campbell diagram, stability, and unbalance response.

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“…This paper highlighted on reliable rotor dynamic design as a whole, ranging from systematic R&D efforts to high-demand testing [2]. The literature shows several examples of high sub synchronous vibrations that made necessary changes to the machine [3][4][5]. This work focuses on emphasizing some of the latest findings on rotating machine common defects.…”

Section: Introductionmentioning

confidence: 99%

Reliability based Maintenance Model to Assess the Condition of Rotor using XLrotor

Murgayya¹,

Suresh²,

Madhusudhan³

et al. 2019

Int J Performability Eng

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The work carried out is focused on study and behavior of rotors and to check the reliability at the design stage using the advanced XLrotor tool. For the selected rotor, the failures are controlled by shifting critical speeds above the maximum speed in which it is designed for. The rotor is balanced with safe limits of vibration severity criteria as per ISO standards for an optimized model. Sensitivity analysis is carried out on the rotor model by varying factors such as the diameter of shaft, disk configuration, disk offset, and load on rotor model. The results obtained show good agreement with the FEM results. The results obtained are undamped & damped critical speeds, as well as velocity & dynamic load on bearings due to imbalance using XLrotor. The rotor model is balanced for a steel shaft with a steel disk as well as a steel shaft with an aluminum disk (optimized rotor model) as part of the corrective method. The work clearly emphasizes XLrotor for designing a highly reliable rotor that is safe for operating conditions.

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Experience in Full Load Testing Natural Gas Centrifugal Compressors for Rotordynamics Improvements

Cited by 12 publications

References 3 publications

Improving the rotordynamic stability of short labyrinth seals using positive preswirl

Improving the rotordynamic stability of short labyrinth seals using positive preswirl

Impact of damper seal coefficients uncertainties in rotor dynamics

Reliability based Maintenance Model to Assess the Condition of Rotor using XLrotor

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