Aerodynamic Design of S-Shaped Diffusers Using Ball–Spine Inverse Design Method

Madadi, Ali; Kermani, M.J.; Nili-Ahmadabadi, Mahdi

doi:10.1115/1.4027905

Cited by 17 publications

(3 citation statements)

References 15 publications

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“…Madadi et al [56] utilized the BSA for the quasi-3D inverse design of an S-shaped duct. In addition, they employed the BSA for the design of 2D cascade blades with sharp [57,58] and blunt [59] leading edges, and for the quasi-3D inverse design of the axialflow compressor rotor and stator blades [60].…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic Inverse Design of Transonic Compressor Cascades with Stabilizing Elastic Surface Algorithm

et al. 2021

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The upgraded elastic surface algorithm (UESA) is a physical inverse design method that was recently developed for a compressor cascade with double-circular-arc blades. In this method, the blade walls are modeled as elastic Timoshenko beams that smoothly deform because of the difference between the target and current pressure distributions. Nevertheless, the UESA is completely unstable for a compressor cascade with an intense normal shock, which causes a divergence due to the high pressure difference near the shock and the displacement of shock during the geometry corrections. In this study, the UESA was stabilized for the inverse design of a compressor cascade with normal shock, with no geometrical filtration. In the new version of this method, a distribution for the elastic modulus along the Timoshenko beam was chosen to increase its stiffness near the normal shock and to control the high deformations and oscillations in this region. Furthermore, to prevent surface oscillations, nodes need to be constrained to move perpendicularly to the chord line. With these modifications, the instability and oscillation were removed through the shape modification process. Two design cases were examined to evaluate the method for a transonic cascade with normal shock. The method was also capable of finding a physical pressure distribution that was nearest to the target one.

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Section: Introductionmentioning

confidence: 99%

Aerodynamic Inverse Design of Transonic Compressor Cascades with Stabilizing Elastic Surface Algorithm

et al. 2021

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“…The performance of aero engines influenced by air intake so much. The S-shaped diffuser has a widely use compared to other types of intakes [1]. Therefore, the study of S-shaped diffuser one of the prevailing research subjects in mechanical engineering because of the important applications for example of aero engines.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on the Performance of S-Shaped Diffuser With Shorten Length

2018

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This study presents numerical investigation on the performance of S-shaped air intake normal and aggressive diffuser with 22% length reduction. Both models have same area ratio of 3.1 with different total length, turning angle and radius of curvature. The numerical investigation was implemented using CFD simulation by ANSYS-FLUENT 15 software. The inlet Reynold number was 4×104 and turbulence intensity 4.1%. The performance evaluation was performed throw evaluation the static pressure coefficient, pressure loss coefficient, distortion coefficient and static pressure wall coefficient. The numerical results show that the performance in the case of aggressive S-shaped diffuser has been reduced compared to the normal S-shaped diffuser. This reduction resulting from the early flow separation and increase of the separation zone due to the high curvature of top and bottom surfaces of aggressive S-shaped diffuser. The results show that the static pressure recovery coefficient decreased by 31%, the total pressure loss coefficient and distortion coefficient increased by 9.5% and 8.2%, respectively, compared to the S-shaped diffuser. The static pressure wall coefficient on the top and bottom surfaces was dropped with the aggressive S-shaped diffuser.

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“…This part is strongly affecting the engine performance. Among the most commonly applied types of intakes is the S-shaped diffuser, which guides air from around a plane body to the engine inlet [1]. The S-shaped diffusers have centerline curvatures and cross-sectional areas that increase along the flow direction.…”

Section: Introductionmentioning

confidence: 99%

Flow control in s-shaped air intake diffuser of gas turbine using proposed energy promoters

2017

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Abstract. This paper presents an experimental and numerical investigation of the flow control in an air intake S-shaped diffuser with and without energy promoters. The S-shaped diffuser had an area ratio 3.1and turning angle of 45°/45°. The proposed energy promoter was named as stream line sheet energy promoter. Computational Fluid Dynamics simulation was performed through commercial ANSYS-FLUENT 16.2 software. The measurements were made inside annular subsection, 45° from 360 o of the complete annular shape of the diffuser, at Reynolds number 5.8×10 4 and turbulence intensity 4.1%. Results for the bare S-shaped diffuser (without energy promoters) showed the flow structures within the S-shaped diffuser were dominated by counter-rotating vortices and boundary layer separation especially in the outer surface. The combination of the adverse pressure gradient at the first bend of outer surface and upstream low momentum wakes caused the boundary layer to separate early. The combinations of proposed energy promoters were installed on the inner and outer surfaces at three installation planes. The use of energy promoters resulting in significantly decreased the outer surface boundary layer separation with consequential improving the static pressure coefficient and reduction of total pressure losses.

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Aerodynamic Design of S-Shaped Diffusers Using Ball–Spine Inverse Design Method

Cited by 17 publications

References 15 publications

Aerodynamic Inverse Design of Transonic Compressor Cascades with Stabilizing Elastic Surface Algorithm

Aerodynamic Inverse Design of Transonic Compressor Cascades with Stabilizing Elastic Surface Algorithm

Comparative Study on the Performance of S-Shaped Diffuser With Shorten Length

Flow control in s-shaped air intake diffuser of gas turbine using proposed energy promoters

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