Velocity and turbulence measurements in a separating boundary layer with and without passive flow control

Satta, Francesca; Simoni, Daniele; Ubaldi, Marina; Zunino, Pietro; Bertini, Francesco; Spano, Ennio

doi:10.1243/09576509jpe457

Cited by 16 publications

(6 citation statements)

References 21 publications

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“…VGs are a passive control system that projects perpendicular to the surface by increasing the near-wall momentum through its transfer from the outer flow to the wall region or inner flow. 11 However, this technology is not only applied to wind turbines but also to gas turbines as mentioned by Satta et al., 12 thus showing that these devices are highly effective.…”

Section: Introductionmentioning

confidence: 99%

A triangular vortex generator modeling on a DU97-W-300 airfoil by a source term model

Galera

Martínez-Filgueira

Fernández-Gámiz

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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Vortex generators are passive devices employed to improve the aerodynamic performance of aircraft and wind turbine blades. More concretely, these devices have high potential in improving the power output of wind turbines that are producing less power than expected. Besides, it can improve the aerodynamic performance of the nearest parts to the rotor of turbine blades that usually enter in stall. The main goal of this article is to model the triangular vortex generator effect on a DU97-W-300 airfoil by a source term model. This is aimed by comparing the lift and drag coefficients from experimental studies with the data obtained in the computational fluid dynamics study. Furthermore, the vertical path and the size and strength of the vortex are studied for different angles of attack in order to see how the vortex genertaor behaves in different conditions.

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Section: Introductionmentioning

confidence: 99%

A triangular vortex generator modeling on a DU97-W-300 airfoil by a source term model

Galera

Martínez-Filgueira

Fernández-Gámiz

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…Sattaet et al. 20 investigated the performance of low-profile vortex generations experimentally. When there was no vortex generation on wall, separation was observed.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the flow-control strategy for an aggressive turbine transition ducts

Liu

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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After being studied for years, aggressive intermediate turbine duct is being attempted to be applied in turbine design to further improve the engine-performance. With such design, the shaft could be shortened effectively. However, under the influence of the more distorted coming-flow and stronger pressure-gradient in a real engine, the flow field would be more complicated definitely. Besides that, the upstream-rotor tip-leakage flow is a key loss-source by inducing separation. Flow-control strategies are necessary in this situation. In this paper, the flow field in an aggressive duct has been analyzed to declare the source of separation primarily. Then wide-chord blade design concept has been adopted as a control strategy firstly to realize the purpose of improving the areo-performance. After being verified, numerical method has been used in this study. Under the same aero-condition, the prototype and the modified turbine are analyzed. With this novel flow-control strategy, separation has been improved, even diminished. However, the flow structures within the blade passage are altered correspondingly. An instrumental conclusion is that the pressure loss could be decreased successfully by designing the wide-chord blade specially.

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“…Vortex generators (VGs) have been widely used in aircrafts to suppress the secondary flow and shock-induced separation, 11 and the main investigation objects are airplane fuselage, 12 interturbine duct, 13 compressor, 14 and turbine. 15–17 VGs are commonly used to weaken the secondary flow and decrease total pressure loss. Generally, VGs could change the flow direction of the boundary layer cross-flow near the end-wall as well as transport high-energy fluid from the main flow into the boundary layer to suppress the corner separation, which has become one of the most effective ways to improve the aerodynamic performance of a compressor.…”

Section: Introductionmentioning

confidence: 99%

Effects of modified micro-vortex generators on aerodynamic performance in a high-load compressor cascade

Chu

Zhang

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part A:

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In the current study, the effects of micro-vortex generators on the flow characteristics of a high-load compressor cascade are investigated, and four types of micro-vortex generators including “rectangular,” “curved rectangular,” “trapezoidal,” and “curved trapezoidal” are considered and named VGR, VGCR, VGT, and VGCT separately. The calculated results show that a rising reverse flow region, which is considered a main reason for occurring stall at +8° incidence, collapses rapidly from the leading edge in the cascade. Therefore, the micro-vortex generators are all mounted on the end-wall in front of the passage to suppress the development of the secondary flow, and the stall occurrence is delayed from +8° to +11° incidence by applying VGCT. At the design condition, the VGT can make the total pressure loss decrease by 0.54%. The modified micro-vortex generators show an obvious superiority when the range of incidence is between +3° and +8°. At the stall condition, the VGCT can make the total pressure loss decrease by 9.36%. Moreover, the reduction of the secondary flow loss is considered a main goal of the adoption of micro-vortex generators which is an achievement for decreasing the total pressure loss, and the highest reduction of the secondary flow loss reaches 34.6% at the stall condition in the cascade with VGCT.

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Velocity and turbulence measurements in a separating boundary layer with and without passive flow control

Cited by 16 publications

References 21 publications

A triangular vortex generator modeling on a DU97-W-300 airfoil by a source term model

A triangular vortex generator modeling on a DU97-W-300 airfoil by a source term model

Investigation on the flow-control strategy for an aggressive turbine transition ducts

Effects of modified micro-vortex generators on aerodynamic performance in a high-load compressor cascade

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