Effect of Jet Vortex Generators on Shock Wave Induced Separation on Gas Turbine Profile

Flaszyński, Paweł; Doerffer, Piotr; Piotrowicz, Michal

doi:10.1007/s11630-021-1472-x

Cited by 3 publications

(1 citation statement)

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“…VGJ with small diameter can stabilize the separation region by reducing the oscillation frequency and amplitude of the shock; VGJ with large diameter, instead, increased the unsteadiness of flow field. Flaszynski et al 31 numerically investigated the effect of VGJ on flow separation induced by shock in a turbine cascade with cooling holes. Results showed that the streamwise vortices caused by VGJ suppressed the flow separation.…”

Section: Introductionmentioning

confidence: 99%

Control mechanism of vortex-generator jet on turbulent separation in a highly loaded compressor cascade

Cao

Song²,

Guo

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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The active flow control technique of vortex-generator jet (VGJ) was used to control the turbulent separation of a highly loaded compressor cascade at a high incidence. VGJ schemes on suction surface with different jet locations, skewed angles, pitch angles were numerically performed and the control mechanism of VGJ parameters on the flow field of the cascade was revealed. For avoiding the effect of endwall boundary layer, both endwall surfaces of the cascade were set to translational periodicity boundary (TPB). Results show that VGJ significantly eliminates the turbulent separation and improves the performance of cascade. The overall loss coefficient of cascade is reduced by 52.3% at most. The optimal VGJ location in this study is not separation location but 7% axial chord downstream of it, which is probably due to the ultra-high loading of the cascade. The spanwise location and intensity of jet vortices are mainly affected by skewed angle, and will increase with the skewed angle. The VGJ case with a higher pitch angle features better control effect on suction surface but increases the pitchwise scale of the low-velocity region. In addition, as pitch angle increases, the mixing loss between mainstream and jet flow increases, which brings a negative effect on cascade performance. In order to enhance the momentum transporting between mainstream flow and separation flow, counter vortex-generator jet (CVGJ) schemes were designed and studied. Though CVGJ strengthens the jet vortices near the trailing edge and achieves minimum loss near TPB sections at 150% axial chord section, the interaction of jet vortices with opposite rotating direction brings extra loss, which leads to the control effect of CVGJ is weaker than that of VGJ.

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Section: Introductionmentioning

confidence: 99%