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, Marco; Engeda, Abraham; Cave, Michael

doi:10.1177/0957650912474386

Cited by 14 publications

(16 citation statements)

References 29 publications

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“…On basis of the above joint simulation method, unsteady flow simulation was conducted under several working conditions of Q 17 Current signal was processed by FFT. Figure 5 shows the current spectrum at designed working condition.…”

Section: Motion Equationmentioning

confidence: 99%

Unsteady characteristics analysis of centrifugal pump operation based on motor stator current

Sun

Yuan

Luo

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part A:

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Motor current signature analysis technology is a cost-effective, non-intrusive and reliable technique used for monitoring of motor-driven devices. In this method, the motor is regarded as a torque sensor. Theoretical analysis, numerical simulation, and experiment were conducted to do research on time–frequency analysis of current signature for unsteady characteristic extraction of pump operation. Results show that most energy of current is concentrated on the first order of Intrinsic Mode Function (IMF) component. Torque related oscillation could be reflected by energy amplitude and its variation. The root mean square and kurtosis value of transient energy in Hilbert spectrum could be regarded as the indicators of centrifugal pump operation point detection. Hilbert marginal spectrum could depict the stability of centrifugal pump operation and suggest the proper operation points to ensure high efficiency and reliability.

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Section: Motion Equationmentioning

confidence: 99%

Unsteady characteristics analysis of centrifugal pump operation based on motor stator current

Sun

Yuan

Luo

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…13 and Vagani et al. 14 found that increased exit pressure and increased positive attack angle could trigger stall. Vo et al.…”

Section: Introductionmentioning

confidence: 99%

One-dimensional modeling for tip clearance leakage vortex trajectory and stall-onset prediction in subsonic centrifugal impellers

Zhang

Dong

Liu

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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Two one-dimensional models are established for the tip leakage vortex trajectory and rotating stall-onset point prediction respectively for subsonic centrifugal impellers. The goal of modeling is to supply an effective estimation strategy of the stall-onset point for use in the one-dimensional performance prediction stage. The tip leakage vortex trajectory prediction is a critical part of the stall-onset prediction. The proposed one-dimensional model (one-dimensional tip leakage vortex trajectory model) to predict the tip leakage vortex trajectory is based on blade loading, i.e. the velocity difference between the pressure and suction surfaces. The loading function considers the effect of radial rotation, blade turning, and passage width variation. Compared with the computational fluid dynamics results, the current model shows reasonable accuracy, with an average relative error below 12.35%. The one-dimensional prediction model (Model II) is developed to determine the stall-onset point, where the interface between the tip leakage flow and the main flow spills from the blade leading edge. In this model, the momentum balance analysis is applied to identify the position of the interface. The parameter of the tip leakage vortex trajectory in Model II is determined by one-dimensional tip leakage vortex trajectory model. The effective origin of the tip leakage flow is correlated with the rotational speed and tip clearance. The effectiveness of Model II is validated with the experimental and computational fluid dynamics results using three impellers. Compared with the conventional model (Model I), Model II shows better accuracy, with a maximum error of about 7.42%.

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“…Rotating stall is an unsteady flow phenomenon that involves rotating regions of reversed flow. According to Vagani et al [11], in a centrifugal compressor, the flow distortions that make up rotating stall can appear with multiple lobes, or cells, distributed equidistantly around the impeller passage. The number of cells commonly varies between 1 and 5, with 3-cell stall being the most widely reported.…”

Section: Introductionmentioning

confidence: 99%

Effect of Bolts on Flow and Heat Transfer in a Rotor–Stator Disk Cavity

Mohamed

Chew

Hills

2017

Journal of Engineering for Gas Turbines and Power

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Previous studies have indicated some differences between steady computational fluid dynamics (CFD) predictions of flow in a rotor–stator disk cavity with rotating bolts compared to measurements. Recently, time-dependent CFD simulations have revealed the unsteadiness present in the flow and have given improved agreement with measurements. In this paper, unsteady Reynolds averaged Navier–Stokes (URANS) 360 deg model CFD calculations of a rotor–stator cavity with rotor bolts were performed in order to better understand the flow and heat transfer within a disk cavity previously studied experimentally by other workers. It is shown that the rotating bolts generate unsteadiness due to wake shedding which creates time-dependent flow patterns within the cavity. At low throughflow conditions, the unsteady flow significantly increases the average disk temperature. A systematic parametric study is presented giving insight into the influence of number of bolts, mass flow rate, cavity gap ratio, and the bolts-to-shroud gap ratio on the time-dependent flow within the cavity.

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

Cited by 14 publications

References 29 publications

Unsteady characteristics analysis of centrifugal pump operation based on motor stator current

Unsteady characteristics analysis of centrifugal pump operation based on motor stator current

One-dimensional modeling for tip clearance leakage vortex trajectory and stall-onset prediction in subsonic centrifugal impellers

Effect of Bolts on Flow and Heat Transfer in a Rotor–Stator Disk Cavity

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