Unsteady and Three-Dimensional Flow Phenomena in a Transonic Centrifugal Compressor Impeller at Rotating Stall

Iwakiri, Kenichiro; Furukawa, Masato; Ibaraki, Seiichi; Tomita, Isao

doi:10.1115/gt2009-59516

Cited by 24 publications

(22 citation statements)

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“…For the most part, the stall in these cases has been located in the diffuser. The results by Stein 13 and Iwakiri et al 14 are both for unshrouded impellers that show a similar type of tip stall to that present in axial compressors. Simulation results of full-span impeller rotating stall cannot be found in the literature.…”

Section: Introductionmentioning

confidence: 84%

Prediction of impeller rotating stall onset using numerical simulations of a centrifugal compressor. Part 1: Detection of rotating stall using fixed-flow transient simulations

Vagani

Engeda

Cave³

2013

Proceedings of the Institution of Mechanical Engineers, Part A:

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Rotating stall is an unsteady flow phenomenon that appears in both axial and centrifugal compressors. It is detrimental to the performance of the compressor, significantly narrowing its operating range. Numerical modeling of this phenomenon has been a major area of investigation for axial compressors with some success. While stall occurs less often in centrifugal compressors than axial ones, it can be much harder to predict. Some preventive measures are known but are mostly rules of thumb developed through experimental experience. This work focuses on the detection of impeller rotating stall using computational fluid dynamics. A compressor was chosen that has demonstrated rotating stall instabilities with different diffuser lengths and return vanes. Unsteady numerical simulations were performed on full 360 models of this geometry. The transient simulations were conducted using distributed processing on high-performance servers. The objective was to determine the accuracy in which rotating stall can be captured in simulations. For this purpose, simulation results were compared to experimental results for the same compressor and show a good correlation between the experimental and numerical tests.

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Section: Introductionmentioning

confidence: 84%

Prediction of impeller rotating stall onset using numerical simulations of a centrifugal compressor. Part 1: Detection of rotating stall using fixed-flow transient simulations

Vagani

Engeda

Cave³

2013

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…The model was used to predict whether a surge or stall would occur at stall limit. Similarly, Iwakiri et al [1] and Huabing et al [6] carried out similar work on rotating stall on centrifugal and axial compressors respectively.…”

Section: Other Approaches/techniquesmentioning

confidence: 99%

“…According to Iwakiri, et al [1], rotating stall causes the compressor to operate with extremely low frequencies resulting in excessive high internal temperature that has an adverse effect on blade life. Surge causes severe problems such as excessive pressure built-up at the inlet and cyclic loading on the compressor.…”

Section: Introductionmentioning

confidence: 99%

Computer-Aided Solution to the Vibrational Effect of Instabilities in Gas Turbine Compressors

Ogbonnaya¹

2010

Engineering

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Surge and stall are the two main types of instabilities that often occur on the compressor system of gas turbines. The effect of this instability often leads to excessive vibration due to the back pressure imposed to the system by this phenomenon. In this work, fouling was observed as the major cause of the compressor instability. A step to analyze how this phenomenon can be controlled with the continuous examination of the vibration amplitude using a computer approach led to the execution of this work. The forces resulting to vibration in the system is usually external to it. This external force is aerodynamic and the effect was modeled using force damped vibration analysis. A gas turbine plant on industrial duty for electricity generation was used to actualize this research. The data for amplitude of vibration varied between -15 and 15 mm/s while the given mass flow rate and pressure ratio were determined as falling between 6.1 to 6.8 kg/s and 9.3 to 9.6 respectively. A computer program named VICOMS written in C++ programming language was developed. The results show that the machine should not be run beyond 14.0 mm vibration amplitude in order to avoid surge, stall and other flow-induced catastrophic breakdown.

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“…Surge causes severe problems such as excessive pressure build-up at the inlet and cyclic loading on the compressor. These instabilities might lead to the inability of the compressor blade to produce the required compression and the engine might sustain catastrophic damage as a result of the excessive vibration (Iwakiri et al 2009 andKurz, 2009). The objective of this work is therefore to enunciate a method to further improve the operational performance of the GT through online water washing.…”

Section: Introductionmentioning

confidence: 99%

A Model-Based Mixed Data Approach for Optimizing the Performance of an Offshore Gas Turbine Compressor

Ogbonnaya¹,

Ugwu²,

Diema³

2013

JVWP

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Gas turbines play prominent role in aviation, power generation, marine, mining, petrochemicals, onshore and offshore oil and gas industries. Environmental factors result to degradation mechanics of the overall performance of the engine. Industrialist therefore face unplanned equipment and manufacturing downtime which is undesirable because it leads to economic losses and costly repairs. While condition monitoring is used to obtain early warning of impending equipment failure, optimization techniques such as water washing (online and offline) are used to bring the engine/equipment back to lime-light. In this work, several schedule visits were made to a gas turbine plant on industrial duty for electricity generation in an offshore thermal station at Ibeno, near Eket, Akwa Ibom State in Nigeria. Continuous monitoring of the aerothermodynamics and vibration data were taken for a period of twelve months on hourly basis to examine the state of health of the engine due to adverse offshore environmental factors. The diagnostic approach of vibration analysis, trend and performance monitoring were used with a model-based mixed data approach for optimizing the performance of the offshore gas turbine plant.A software code-named VANCANAL written in C ++ programming language was used to proactively monitor the gas turbine plant. The software displayed the operational (actual) values of all the parameters of the engine against their designed (reference) values. Once a set limit is exceeded, the software is capable of giving an alarm, signifying the need for maintenance.

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Unsteady and Three-Dimensional Flow Phenomena in a Transonic Centrifugal Compressor Impeller at Rotating Stall

Cited by 24 publications

References 0 publications

Prediction of impeller rotating stall onset using numerical simulations of a centrifugal compressor. Part 1: Detection of rotating stall using fixed-flow transient simulations

Prediction of impeller rotating stall onset using numerical simulations of a centrifugal compressor. Part 1: Detection of rotating stall using fixed-flow transient simulations

Computer-Aided Solution to the Vibrational Effect of Instabilities in Gas Turbine Compressors

A Model-Based Mixed Data Approach for Optimizing the Performance of an Offshore Gas Turbine Compressor

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