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

Hecklau, Martin; Gmelin, Christoph; Nitsche, W.; Thiele, Frank; Huppertz, André; Swoboda, M.

doi:10.1177/0957650911410156

Cited by 17 publications

(6 citation statements)

References 18 publications

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“…Intensive studies have been conducted on handling the flow of the suction side, which is largely influenced by unsteady inflow conditions. Active methods have been investigated as shown in [10][11][12][13][14]. Opposed to active flow control, relying on additional energy to influence the flow, the passive approach is mostly driven by changing pressure gradients.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigations on Optimized 3D Compressor Airfoils

Mihalyovics

Brück

Peitsch

et al. 2018

Volume 2A: Turbomachinery

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The objective of the presented work is to perform numerical and experimental studies on compressor stators. This paper presents the modification of a baseline stator design using numerical optimization resulting in a new 3D stator. The Rolls Royce in-house compressible flow solver HYDRA was employed to predict the 3D flow, solving the steady RANS equations with the Spalart-Allmaras turbulence model, and its corresponding discrete adjoint solver. The performance gradients with respect to the input design parameters were used to optimize the stator blade with respect to the total pressure loss over a prescribed incidence range, while additionally minimizing the flow deviation from the axial direction at the stator exit. Non-uniform profile boundary conditions, being derived from the experimental measurements, have been defined at the inlet of the CFD domain. The presented results show a remarkable decrease in the axial exit flow angle deviation and a minor decrease in the total pressure loss. Experiments were conducted on two compressor blade sets investigating the three-dimensional flow in an annular compressor stator cascade. Comparing the baseline flow of the 42° turning stator shows that the optimized stator design minimizes the secondary flow phenomena. The experimental investigation discusses the impact of steady flow conditions on each stator design while focusing on the comparison of the 3D optimized design to the baseline case. The flow conditions were investigated using five-hole probe pressure measurements in the wake of the blades. Furthermore, oil-flow visualization was applied to characterize flow phenomena. These experimental results are compared with the CFD calculations.

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Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigations on Optimized 3D Compressor Airfoils

Mihalyovics

Brück

Peitsch

et al. 2018

Volume 2A: Turbomachinery

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“…The actuators are calibrated for an outlet speed of up to u jet = 100 m/s and u jet /v 1 = 4 in relation to the average inflow conditions and a duty cycle of DC = 50%. The specific characteristics of the actuators used are presented in [9]. The measurement blade is equipped with 44 pressure taps, 27 of which are installed on the suction side and 17 on the pressure side.…”

Section: Methodsmentioning

confidence: 99%

“…Blade actuators avoid flow separation on the blade itself. In earlier works the positive achievements using both side wall and blade actuators were investigated by [9], [10], [11] using pulsed air jets, where a reduction in loss of 10% was realized. The major advantage of pulsed air jets instead of steady ones, as used in [2], is the reduction of the necessary air mass flow rate.…”

Section: Introductionmentioning

confidence: 98%

Active Flow Control on a Highly Loaded Compressor Cascade with Non-steady Boundary Conditions

Staats

Nitsche

Peltzer

2015

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

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Abstract. This paper discusses the effect of a periodical disturbance in the wake of a highly loaded axial compressor on the pressure distribution and the secondary flow characteristics of the turbo machinery stator blades. A large scale axial compressor cascade, consisting of six two dimensional passages, has been used for this investigation. The test rig is equipped with an active flow control system to enhance the operating range of the compressor. Results that have been achieved by means of side wall actuation are also presented.

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“…In order to achieve identical incoming boundary conditions with the experiment, 26 at the inlet, the total pressure profile along the blade span was set, while total temperature, inflow direction, and turbulent intensity were given as well. The averaged static pressure was set at the outlet.…”

Section: Computational Proceduresmentioning

confidence: 99%

Flow separation control on a highly loaded compressor cascade using endwall synthetic jets

Qin

Song

Wang

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part G:

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This paper presents flow separation control conducted on a highly loaded compressor stator cascade using endwall synthetic jets. Numerical methods are employed and mechanisms of endwall synthetic jets in improving the cascade performance are discussed in detail. The influence of several actuation parameters is also investigated. Results show that endwall synthetic jets are able to improve the flows in the blade passage significantly, a maximum loss reduction of 21.63% and a pressure rise increment of 5.60% are obtained at design condition. Apart from energizing the low momentum fluid inside endwall boundary layer by streamwise momentum addition, endwall synthetic jets could induce a streamwise jet vortex and impede the transverse movement of endwall boundary layer through upwash and downwash. Hence, at the expense of slightly degraded near-wall flows, the formation and further evolution of passage vortex would be delayed and flows in the midspan region would be improved notably. The effectiveness of endwall synthetic jets relies on the proper selection of actuation position and jet angle. Flow control turns out to be the most efficient when the actuator is positioned at just upstream of corner separation region with a relatively small jet angle, and a large enough injected momentum is also necessary. Additionally, the adaptability of the actuation at off-design conditions is validated in the present study.

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

Cited by 17 publications

References 18 publications

Numerical and Experimental Investigations on Optimized 3D Compressor Airfoils

Numerical and Experimental Investigations on Optimized 3D Compressor Airfoils

Active Flow Control on a Highly Loaded Compressor Cascade with Non-steady Boundary Conditions

Flow separation control on a highly loaded compressor cascade using endwall synthetic jets

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