Stall inception and warning in a single-stage transonic axial compressor with axial skewed slot casing treatment

Lim, Byeung Jun; Park, Tae Choon; Kwon, Soon-Yong

doi:10.1007/s12206-014-0818-7

Cited by 9 publications

(3 citation statements)

References 32 publications

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“…CTs can be broadly classified into two categories: groove type 19–21 and slot type. 22–24 Takata 25 experimentally investigated CTs using low-speed compressors. The results indicated that slot-type CTs could provide a larger stall margin improvement, among which the skewed slots showed the best improvement.…”

Section: Introductionmentioning

confidence: 99%

Influence of axial skewed slots on the rotating instability of a low-speed axial compressor

Ouyang

2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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Experimental and numerical analyses were performed on a low-speed axial compressor rotor to investigate the aerodynamic and acoustic effects of axial skewed slots casing treatment on the rotating instability. The experimental results showed that the stall margin could be improved by 8.0% and the frequency broadband hump owing to the rotating instability was suppressed effectively. In the noise spectra, the two dominant broadband humps on both sides of the blade-passing frequency also reduced in amplitude. Full-annulus unsteady computational fluid dynamics simulations were performed near the design condition. Time- and frequency-domain analyses as well as a proper orthogonal decomposition method were applied to obtain the oscillation, frequency, energy and flow characteristics of the rotating instability. Axial skewed slots casing treatment causes a distinct reduction in the amplitude of the pressure fluctuations and frequency spectra with a decrease in the energy of the rotating instability modes. The slots alleviated the tip flow blockage by the periodic injection and removal of the fluid from the passage, which enabled a high tip clearance flow downstream with little impingement on the neighbouring blade tip.

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Section: Introductionmentioning

confidence: 99%

Influence of axial skewed slots on the rotating instability of a low-speed axial compressor

Ouyang

2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…5–7 Moreover, the TLF becomes increasingly unsteady during the throttling process and oscillates at the near-stall point in axial compressors (whether single or multistage, low or high speed), which is probably associated with the onset of instabilities in aero-engine compressors. 8–14…”

Section: Introductionmentioning

confidence: 99%

Effect of tip clearance size on the performance of a low-reaction transonic axial compressor rotor

Zhu

Wang

Zhang

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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This study aimed to enhance the understanding of flow phenomena in low-reaction aspirated compressors. Three-dimensional, multi-passage steady and unsteady numerical simulations are performed to investigate the performance sensitivity to tip clearance variation on the first-stage rotor of a multistage low-reaction aspirated compressor. Three kinds of tip clearance sizes including 1.0τ, 2.0τ and 3.0τ are modeled, in which 1.0τ corresponds to the designed tip clearance size of 0.2 mm. The steady numerical simulations show that the overall performance of the rotor moves toward lower mass flow rate when the tip clearance size is increased. Moreover, energy losses, efficiency reduction and stall margin decrease are also observed with increasing tip clearance size. This can be mostly attributed to the damaging impact of intense tip clearance flow. For unsteady simulation, the result shows periodical oscillation of the tip leakage vortex and a “two-passage periodic structure” in the tip region at the near-stall point. The occurrence of the periodical oscillation is due to the severe interaction between the tip clearance flow and the shock wave. However, the rotor operating state is still stable at this working point because a dynamic balance is established between the tip clearance flow and incoming flow.

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“…Thus, these techniques were not widely used in compressors. Continuous improvement in the understanding of the mechanisms underlying the casing treatments [7][8][9][10][11] and stall inceptions [12][13][14] yielded vast explorations of active control. This strategy comprised the detection of the onset of rotating stall or surge and the execution of tip injection with a feedback control loop.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of self-recirculating casing treatment in a subsonic axial flow compressor

Wang

Chu

Zhang

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part A:

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Parametric studies of recirculating casing treatment were experimentally performed in a subsonic axial flow compressor. The recirculating casing treatment was parameterized with injector throat height, injection position, and circumferential coverage percentage. Eighteen recirculating casing treatments were tested to study the effects on compressor stability and on the compressor overall performance at three blade speeds. The profiles of recirculating casing treatment were optimized to minimize the losses generated by air recirculation. In the experiment, the stalling mass flow rate, total pressure ratio, and adiabatic efficiency of the compressor were measured to study the steady-state effects on the compressor performance of recirculating casing treatments, and static pressure disturbances on the casing wall were monitored to study the influence on stall dynamics. Results indicate that both the compressor stability and overall performance can be improved through recirculating casing treatment with appropriate geometrical parameters for all the test speeds. The influence on stall margin of one geometric parameter often depends on the choice of others, i.e. the interaction effects exist. In general, the recirculating casing treatment with a moderate injector throat and a large circumferential coverage is the optimal choice to enhance compressor stability. The injector of recirculating casing treatment should be placed upstream of the blade tip leading edge and the injector throat height should be lower than four times the rotor tip gap for the benefits of compressor efficiency. At 71% speed, the blade tip loading is decreased through recirculating casing treatment at the operating condition of near peak efficiency and increased near stall. Moreover, the outlet absolute flow angle is reduced in the tip region and enhanced at lower blade spans for both operating conditions. The stall inceptions are not changed with the implementation of recirculating casing treatment for all the test speeds, but the stall patterns are altered at 33% and 53% speeds, i.e. the stall with two cells is detected in the recirculating casing treatment compared with the solid casing with only one stall cell.

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Stall inception and warning in a single-stage transonic axial compressor with axial skewed slot casing treatment

Cited by 9 publications

References 32 publications

Influence of axial skewed slots on the rotating instability of a low-speed axial compressor

Influence of axial skewed slots on the rotating instability of a low-speed axial compressor

Effect of tip clearance size on the performance of a low-reaction transonic axial compressor rotor

Experimental study of self-recirculating casing treatment in a subsonic axial flow compressor

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