Development of a bluff body wake under the combined influence of curvature and pressure gradient

Tulapurkara, E. G.; Ramjee, V.; George, Jacob

doi:10.1007/bf00211386

Cited by 10 publications

(2 citation statements)

References 17 publications

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“…In addition, the comparative analysis of the u 2 and υ 2 distributions reflect the double peaks. This phenomenon is more detail described in papers [7,48,49]. The authors claimed that at a positive angle of attack the double peaks more noticeable.…”

Section: Reynolds Stress Tensor and Degree Of Anisotropymentioning

confidence: 81%

Hot-Wire Investigation of Turbulence Topology behind Blades at Different Shape Qualities

et al. 2022

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The scope of this paper is to perform a detailed experimental investigation of the shape error effect on the turbulence evolution behind NACA 64-618 airfoil. This airfoil is 3D-printed with predefined typical shape inaccuracies. A high-precision optical 3D scanner was used to assess the shape and surface quality of the manufactured models. The turbulent flow was studied using hot-wire anemometry. The developed force balance device was provided to measure the aerodynamic characteristics of the airfoil. Experimental studies were carried out for three angles of attack, +10∘, 0∘, −10∘, and different chord-based Reynolds numbers from 5.3×104 to 2.1×105. The obtained results show that the blunt trailing edge and rough surface decline the aerodynamic performance of the blades. In addition, the experimental results revealed a strong sensitivity of the Taylor microscale Reynolds number to the type of shape inaccuracy, especially at Re≈1.7×105. We also discuss the evolution of the Reynolds stress components, the degree of flow anisotropy, and the power spectrum distributions depending on the airfoil inaccuracies.

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Section: Reynolds Stress Tensor and Degree Of Anisotropymentioning

confidence: 81%

Hot-Wire Investigation of Turbulence Topology behind Blades at Different Shape Qualities

et al. 2022

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“…Nakayama [4] studied the mean and turbulence quantities in the wake of a wire, subjected to mild pressure gradient and streamline curvature e ects. A series of experiments were later reported by Ramjee et al [5], Ramjee and Neelakandan [6,7] and Tulapurkara et al [8,9], who used NACA 0012 airfoils and square cylinders as the wake generating body placed in a curved duct. Further studies were reported by John and Schobeiri [10], Schobeiri et al [11] who used a circular rod, and Starke et al [12] who used a at plate as the wake generating body.…”

Section: Introductionmentioning

confidence: 93%

Numerical prediction of a turbulent curved wake and comparison with experimental data

Mokhtarzadeh‐Dehghan

Piradeepan

2005

Numerical Methods in Fluids

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SUMMARYNumerical studies of the curved wake of a NACA 0012 airfoil of chord length 0:150 m are presented. The airfoil is placed in air at 10 m=s in the straight section of a duct of 0:457 m × 0:457 m cross-section followed by a 90• bend with a mean radius-to-height ratio of 1.17. The trailing edge is located at one chord length upstream of the bend entry plane. The authors' own measurements are used to deÿne the boundary conditions and for comparison with the predicted results.The numerical models are based on the time-averaged, three-dimensional conservation equations of uid ow, incorporating the k-, RNG k-, realizable k-and the Reynolds stress turbulence models. The results show that the models are capable of predicting the e ects of curvature on the wake development. However, quantitative di erences between prediction and experiment exist. The results obtained using the Reynolds stress model show better agreement with the experimental data, compared with the k-based models, but not consistently for all parameters. There are also better predictions by the RNG k-and realizable k-models compared with the standard k-model. The predicted results using the RNG k-are closer to experimental data than the realizable k-.

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Separation control in a conical diffuser with an annular inlet: center body wake separation

Elkins

Eaton

2012

Exp Fluids

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Development of a bluff body wake under the combined influence of curvature and pressure gradient

Cited by 10 publications

References 17 publications

Hot-Wire Investigation of Turbulence Topology behind Blades at Different Shape Qualities

Hot-Wire Investigation of Turbulence Topology behind Blades at Different Shape Qualities

Numerical prediction of a turbulent curved wake and comparison with experimental data

Separation control in a conical diffuser with an annular inlet: center body wake separation

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