Effect of Jet Spacing in Separation Control with Air Jet Vortex Generators

Ramaswamy, Deepak Prem; Schreyer, Anne-Marie

doi:10.2514/6.2019-1653

Cited by 3 publications

(2 citation statements)

References 25 publications

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“…Results showed the flow control effect was determined by all jet parameters simultaneously, and the hole jet featured a better performance than slot jet. Ramaswamy and Schreyer [11][12][13] carried out a series of experimental studies on controlling the shock-induced separation by VGJ on the compression ramp with different ramp angles. Results showed that VGJ caused the strong corrugation in separation region, and the velocity amplification was enhanced in interaction region, which led to the reduction of separation region.…”

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%

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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“…Further, the effect of injection through micro ramp on SWBLI control is reported by Vaisakh and Muruganandam 14 and the results suggest an increase in pressure recovery. Recently an experimental study on the effect of jet spacing and injection pressure on the mitigation of SWBLI in a constant area diffuser is presented by Ramaswamy et al 15,16 and effect of micro jet on controlling the separation inside rocket nozzle is demonstrated by Khobragade et al 17 From the above review it can be concluded that the vortices created by the mixing of free stream and jet blown through air jet (AJ) reduce the SWBLI significantly. Since the use of AJ has not been investigated yet for improving the performance of supersonic air intake, the present study aims to explore the usefulness of AJ in improving the performance and overall flow field of supersonic mixed compression air intake.…”

Section: Introductionmentioning

confidence: 99%

Effect of air jet with injection pressure on the performance of mixed compression air intake

Gahlot

Singh

2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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A computational study on the performance of mixed compression supersonic air intake has been carried out with and without air jet at various operating conditions. Commercially available software ANSYS was used and K-ω SST turbulence model was selected to capture the turbulent flow inside the air intake. All the simulations were simulated at a design Mach number of 2.2. Two Air jet of 1 mm diameter each and perpendicular to the local ramp surface have been placed in longitudinal direction at 0.47 times the total length of the air intake. Effect of variation of injection pressure on the flow field of air intake has been studied. Injection pressure has been varied with respect to the free stream pressure. Four different cases of injection pressure have been investigated. Three different positions (1.far away before the air jet, 2. immediately after the air jet and 3. far away behind the air jet) of normal shock were simulated to study the effect of air jet by varying the back pressure of the supersonic air intake. Significant reduction in the flow separation due the normal shock wave was noticed for all the cases of injection pressure, which further helps in improving the performance of the supersonic air intake. Important performance parameters such as flow distortion, mass flow ratio and total pressure recovery were calculated to measure the efficacy of supersonic air intake with air jet at various operating conditions.

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Topological modifications due to ramped vanes in a flare-induced shock–boundary layer interaction flowfield

Nilavarasan

Joshi

Misra

et al. 2021

J Vis

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Effect of Jet Spacing in Separation Control with Air Jet Vortex Generators

Cited by 3 publications

References 25 publications

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

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

Effect of air jet with injection pressure on the performance of mixed compression air intake

Topological modifications due to ramped vanes in a flare-induced shock–boundary layer interaction flowfield

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