Numerical Investigations of Active Flow Control Using Synthetic Jets on a Highly Loaded Compressor Stator Cascade

Gmelin, Christoph; Steger, Mathias; Zander, Vincent; Nitsche, W.; Thiele, Frank; Huppertz, André; Swoboda, M.

doi:10.1115/fedsm-icnmm2010-30725

Cited by 4 publications

(5 citation statements)

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“…A wide parameter study has been carried out for the flow control approach used in these experiments. A detailed description of the results and an efficiency consideration is given in Zander et al 14 Numerical investigations concerning these measurements were published in Gmelin et al, 18 whereas this report focuses on the flow effects caused by the synthetic jet actuation to reduce the pressure losses of the cascade. The flow control parameters presented in the description of the experimental setup were used for all measurements presented here.…”

Section: Flow Control Resultsmentioning

confidence: 99%

Control of secondary flow structures on a highly loaded compressor cascade

Zander¹,

Nitsche²

2013

Proceedings of the Institution of Mechanical Engineers, Part A:

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This paper presents detailed flow-field measurements for a compressor cascade equipped with synthetic jet actuators for active flow control. The synthetic jets are mounted on the cascade sidewall and the suction side surface of the blade to reduce the total pressure loss caused by strong secondary flow structures developing in the passage. There are certain articles reporting that synthetic jets are well suited for flow control applications even in axial compressors and cascades. Most of them are focused on the parameter variation to optimize the efficiency of the control approach, still very little is known on the interaction of the synthetic jet actuators with the flow field. Detailed x-wire and pressure measurements were conducted to understand how synthetic jets influence the flow field and what causes the significant loss reduction in the cascade wake. It seems that the added momentum is not the key parameter for flow control with synthetic jets. In fact, the high mixing and the unsteadiness of the jets seem to amplify existing velocity fluctuations in the flow field. These increased fluctuations result in a shift of the shear layer between the flow separation and the surrounding flow, and thus in a dethrottling of the compressor cascade. Together with the increased mixing, loss reductions of approximately 10% can be reached using synthetic jet actuators.

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Section: Flow Control Resultsmentioning

confidence: 99%

Control of secondary flow structures on a highly loaded compressor cascade

Zander¹,

Nitsche²

2013

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…The number of grid cells increases to 2.5 million. Thus, an acceptable mean of spatial resolution and computational effort is granted, as presented in previous studies [18].…”

Section: Computational Domainmentioning

confidence: 91%

“…All meshes generated provide three full multigrid levels. A previously performed mesh study [18] showed that the use of 2.0 million grid cells ensures sufficient resolution of the base flow. The used mesh resolves the span with 97 points and the maximum dimensionless wall distance is y þ max ¼ 2:3.…”

Section: Computational Domainmentioning

confidence: 99%

Experimental and numerical results of active flow control on a highly loaded stator cascade

Hecklau

Gmelin

Nitsche

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part A:

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This article presents experimental and numerical results for a compressor cascade with active flow control. Steady and pulsed blowing has been used to control the secondary flow and separation characteristics of a highly loaded controlled diffusion airfoil. Investigations were performed at the design incidence for blowing ratios from approximately 0.7 to 3.0 (jet-to-inlet velocity) and a Reynolds number of 840 000 (based on axial chord and inlet velocity). Detailed flow field data were collected using a five-hole pressure probe, pressure taps on the blade surfaces, and time-resolved Particle Image Velocimetry. Unsteady Reynolds-averaged Navier-Stokes simulations were performed for a wide range of flow control parameters. The experimental and numerical results are used to understand the interaction between the jet and the passage flow. The benefit of the flow control on the cascade performance is weighted against the costs of the actuation by introducing an efficiency which takes the presence of the jets into account.

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“…It was also found that although the control effect depends strongly on the injected momentum, it is insensitive to the forcing frequency. Gmelin et al 14,15 conducted numerical investigations on a highly loaded compressor stator cascade with synthetic jets. The actuator positioned on the endwall showed little sensitivity to the actuation frequency within the investigated range, while the control on the corner vortex appeared to be strongly affected by the jet angle.…”

Section: Introductionmentioning

confidence: 99%

“…It is a general idea to locate the flow control devices on the blade suction surface, which has been proved to have remarkable effects by extensive studies. [12][13][14][15][16][17][18][19][20][21] On the other hand, actuators mounted on the endwall can control secondary flow directly and alleviate the accumulation of low momentum fluid towards the corner region, which is worth thorough investigation. In order to shed some light on this kind of flow control method, in this paper, the synthetic jet actuator is mounted on the endwall of a high-speed compressor cascade.…”

Section: Introductionmentioning

confidence: 99%

Active flow control by means of endwall synthetic jet on a high-speed compressor stator cascade

Qin

Song

Chen

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part A:

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The underlying physics of the endwall synthetic jet in improving the aerodynamic performance of a high-speed compressor stator cascade is investigated in this paper. The effects of both injected momentum and actuation frequency are discussed in detail. In the investigations, the injected momentum is controlled by either changing the maximum jet velocity or modifying the tube diameter. Numerical results demonstrate that the streamwise momentum addition and flow mixing enhancement are the key factors of the endwall synthetic jet in improving the cascade performance. The high momentum fluid injected into the flow field can reenergize the passage flow, and the generated streamwise jet vortex contributes to the strengthening of flow mixing. Consequently, the momentum exchange between the low momentum fluid region and the main flow is enhanced and boundary layer separation on the blade suction surface is delayed. The loss characteristic in the corner region is improved as well. The intensified flow mixing will also increase the total pressure loss in the near-endwall region, which as a result will worsen the cascade performance, and hence the total effect of the endwall synthetic jet depends on the sum of its impacts. Moreover, the injected momentum and the actuation frequency have strong influences on the flow control effect. With the momentum coefficient and the reduced frequency being Cµ = 0.131% and F+ = 1.0, the reduction in total pressure loss coefficient and the increment in pressure rise coefficient are 7.3% and 3.3%, respectively.

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Numerical Investigations of Active Flow Control Using Synthetic Jets on a Highly Loaded Compressor Stator Cascade

Cited by 4 publications

References 0 publications

Control of secondary flow structures on a highly loaded compressor cascade

Control of secondary flow structures on a highly loaded compressor cascade

Experimental and numerical results of active flow control on a highly loaded stator cascade

Active flow control by means of endwall synthetic jet on a high-speed compressor stator cascade

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