The Number and Speed of Stall Cells During Rotating Stall

Levy, Y.; Pismenny, Joseph

doi:10.1115/gt2003-38221

Cited by 9 publications

(11 citation statements)

References 6 publications

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“…8. It is notable that the better the rotor of the compressor is "fenced off' from the stator (by means of increased blade turning angle or reduction in rotor tip clearance) the higher is the low frequency of rotating stall (nearer to RSF).…”

Section: Discussionmentioning

confidence: 96%

Pressure Oscillations in a Single Stage Axial-Flow Low-Speed Compressor during Pre-Stall and Stall

Levy¹,

Pismenny²,

Deppe³

et al. 2007

International Journal of Turbo and Jet Engines

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This paper describes the experimental investigations of high-frequency pressure oscillations in a single-stage axial-flow low-speed compressor during rotating stall where the main oscillating frequency is greater than that of rotor rotation and less than or equal (o that of the blade passing frequency. These oscillations are similar to the high-frequency oscillation processes in the flow of multi-stage axial-flow high-speed compressors and low-speed single-stage axial fans described in earlier literature.

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Section: Discussionmentioning

confidence: 96%

Pressure Oscillations in a Single Stage Axial-Flow Low-Speed Compressor during Pre-Stall and Stall

Levy¹,

Pismenny²,

Deppe³

et al. 2007

International Journal of Turbo and Jet Engines

Self Cite

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“…The induced non-uniform force is approximated as a sinusoidal signal here and other forms can refer to Ref. [26]. Corresponding aerodynamic force (thick black line in Figure 2) is then built up in rotating coordinate system (RCS).…”

Section: Rotating Stall Identification and Resonance Condition Formentioning

confidence: 99%

Rotating Stall Induced Non-Synchronous Blade Vibration Analysis for an Unshrouded Industrial Centrifugal Compressor

Zhao

Zhou

Yang³

et al. 2019

Sensors

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Rotating stall limits the operating range and stability of the centrifugal compressor and has a significant impact on the lifetime of the impeller blade. This paper investigates the relationship between stall pressure wave and its induced non-synchronous blade vibration, which will be meaningful for stall resonance avoidance at the early design phase. A rotating disc under a time-space varying load condition is first modeled to understand the physics behind stall-induced vibration. Then, experimental work is conducted to verify the model and reveal the mechanism of stall cells evolution process within flow passage and how blade vibrates when suffering such aerodynamic load. The casing mounted pressure sensors are used to capture the low-frequency pressure wave. Strain gauges and tip timing sensors are utilized to monitor the blade vibration. Based on circumferentially distributed pressure sensors and stall parameters identification method, a five stall cells mode is found in this compressor test rig and successfully correlates with the blade non-synchronous vibration. Furthermore, with the help of tip timing measurement, all blades vibration is also evaluated under different operating mass flow rate. Analysis results verify that the proposed model can show the blade forced vibration under stall flow condition. The overall approach presented in this paper is also important for stall vibration and resonance free design with effective experimental verification.

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“…In order to predict stall point, the inlet velocity was decreased from the designed flow rate Q d . The stall phenomenon always accompanies the large flow vortex, so the Z-vorticity zone with lower negative was taken to characterize the stall cell [24]. As shown in Figure 5, the deep blue region near the suction side of blade represents the stall cell.…”

Section: Prediction For Stall Point Of the Centrifugal Pumpmentioning

confidence: 99%

Effect of Stall Cells on Pressure Fluctuations Characteristics in a Centrifugal Pump

et al. 2019

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Rotating stall is an unsteady flow phenomenon, which always leads to instability and efficiency degradation. In order to reveal pressure fluctuations in the impeller of centrifugal pump induced by stall cells, the flow structures in a volute-type centrifugal pump were calculated using Large Eddy Simulation (LES) method. The predicted results of the numerical model were compared with experimental flow-head curve. The simulation results were in good agreement with the experimental results. The stall phenomenon occurred when the flow rate dropped to 70% of design flow rate. Three stall cells located at the entrance of passages could be observed, which remained stationary relative to the rotating impeller. With the decrease of flow rate, the area occupied by stall cells gradually increased. The peak value of pressure fluctuation at 25% of design flow rate is obviously larger than that at 50% of design flow rate. For the unstalled or stalled passage, the impeller-volute interaction played a leading role in the pressure fluctuations of the impeller. For the stalled passage, the amplitude of the low frequency induced by stall cell is relatively insignificant.

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The Number and Speed of Stall Cells During Rotating Stall

Cited by 9 publications

References 6 publications

Pressure Oscillations in a Single Stage Axial-Flow Low-Speed Compressor during Pre-Stall and Stall

Pressure Oscillations in a Single Stage Axial-Flow Low-Speed Compressor during Pre-Stall and Stall

Rotating Stall Induced Non-Synchronous Blade Vibration Analysis for an Unshrouded Industrial Centrifugal Compressor

Effect of Stall Cells on Pressure Fluctuations Characteristics in a Centrifugal Pump

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