Turbulence generation and decay in the Taylor–Couette system due to an abrupt stoppage

Singh, Harminder; Prigent, Arnaud

doi:10.1017/jfm.2021.346

Cited by 1 publication

(1 citation statement)

References 44 publications

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“…It includes turbulence-inducing grids, wind barriers, active driven fans, etc. The practice of a passive turbulence grid is considered a specified approach for turbulence generation from the time of research that initiates the decay of turbulence (Singh et al , 2021). Due to distinct simplicity in design, construction and concept, the passive grid is recommended for generating preferred turbulence intensity ranging from 0.3% to 12% in many research works.…”

Section: Introductionmentioning

confidence: 99%

Effect of turbulence intensity on aerodynamic characteristics of extended trailing edge airfoil

Livya

Pillai

2022

AEAT

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Purpose This paper aims to study the extended trailing edge airfoil for a range of angle of attack at different intensities of turbulence. Design/methodology/approach In this paper, an experimental study on NACA 0020 airfoil with thin extended trailing edge modification of amplitude of h = 0.1c, 0.2c and 0.3c at the Reynolds number of 2.14 × 105 are tested. The research was carried out for an angle of attack ranging from 0° = α = 35° for the turbulence intensity of 0.3%, 3%, 5%, 7% and 12%. From the experimental readings, the surface pressures are scanned using a Scanivalve (MPS2464) pressure scanner for a sampling frequency of 700 Hz. The scanned pressures are converted to aerodynamic force coefficient and the results are combined and discussed. Findings The airfoil with the extended trailing edge will convert the adverse pressure gradient to a plateau pressure zone, indicating the delayed flow separation. The CL value at higher turbulence intensity (TI = 12%) for the extended trailing edge over perform the base airfoil at the post-stall region. The maintenance of flow stability is observed from the spectral graph. Practical implications A thin elongated trailing edge attached to the conventional airfoil serves as a flow control device by delaying the stall and improving the lift characteristics. Additionally, extending the airfoil's trailing edge helps to manage the performance of the airfoil even at a high level of turbulence. Originality/value Distinct from existing studies, the presented results reveals how the extended trailing edge attached to the airfoil performs in the turbulence zone ranging from 0.3% to 12% of TI. The displayed pressure distribution explains the need for increasing trailing edge amplitude (h) and its impact on flow behaviour. The observation is that extended trailing edge airfoil bears to maintain the performance even at higher turbulence region.

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Section: Introductionmentioning

confidence: 99%