A study of the energetic turbulence structures during stall delay

Wu, Yanhua; Lee, Hsiao Mun; Tang, Hui

doi:10.1016/j.ijheatfluidflow.2015.05.013

Cited by 13 publications

(10 citation statements)

References 23 publications

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“…[-] tangential force coefficient d 1 -d 3 [-] fitting coefficients of the nonlinear flow separation function D 1 -D 4 [-] constants for the ISDM e 1 -e 4 [-] fitting coefficients of the nonlinear flow separation function f [-] flow separation point F Tip [-] loss factor g [-] modification factor H 1 , H 2 [-] constants equal to 0.…”

Section: Symbolmentioning

confidence: 99%

“…Understanding the physics of the boundary layer on a rotating blade has, therefore, received considerable interest. [1][2][3][4] It was shown that stall delay depends on the local solidity of the blade, and it is caused by a reduction in the adverse pressure gradient on the suction surface of the aerofoil. When a blade rotates, there are two external forces induced on the flow: centrifugal and Coriolis.…”

Section: Introductionmentioning

confidence: 99%

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A new stall delay algorithm for predicting the aerodynamics loads on wind turbine blades for axial and yawed conditions

Elgammi

Sant

2017

Wind Energy

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Stall delay is a complicated phenomenon that has gained for many years the attention of industry and academics in the fields of helicopter and wind turbine aerodynamics. Since most of the potential flow theories still rely on the use of 2D aerofoil data for simulating loads on a rotating blade, less degree of accuracy is expected because of 3D rotational effects. In this work, a new model for correcting the 2D steady aerodynamic data for 3D effects is presented. The model can reduce the uncertainty in the blade design process and, subsequently, make wind turbines more cost-effective. This model combines the stall delay model of Corrigan and Schillings, a modified version of an inviscid stall delay model, a new modification factor to account for the effect of the angle of attack changes and a new tip loss factor. Furthermore, the model applies the use of the separation factor of Du and Selig to evaluate the area on the rotor disc where stall delay is most prominent. The new stall delay model was embedded in a free-wake vortex model to estimate the aerodynamic loads on the National Renewable Energy Laboratory Phase VI rotor blades consisting of the S809 aerofoil sections. The results in this study confirm the validity of the 3D corrections by the proposed new model under both axial and yawed flow conditions.

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Section: Symbolmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A new stall delay algorithm for predicting the aerodynamics loads on wind turbine blades for axial and yawed conditions

Elgammi

Sant

2017

Wind Energy

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“…Salunkhe et al 12 proposed that a single-stage axial-flow fan under dynamic inflow distortion could employ an active feedback control strategy though a cross-correlation technique. Yanhua Wu et al 13 revealed that when turbulence is removed from the flow, the peak of certain statistics is reduced. Lei et al 14 presented the effect of an air jet's blowing speed controlling stall in a centrifugal fan.…”

Section: Introductionmentioning

confidence: 99%

Simulation of entropy generation during the evolution of rotating stall in a two-stage variable-pitch axial fan

Zhang

Zheng

Zhang

et al. 2019

Advances in Mechanical Engineering

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Rotating stall is a common instability phenomenon that occurs in turbomachinery. Rotating stall 3D instability can be characterized as one or more stall cells rotating at a fraction of rotor velocity. In this article, the ANSYS Fluent software was used to numerically simulate entropy generation. The relative velocity of the monitoring points in the rotor is discussed, and the type of stall inception is a spike. In addition, five typical conditions that affect the evolution of rotating stalls are presented and discussed with respect to characterizing entropy generation in a two-stage variable-pitch axial fan. The results reveal that entropy generation significantly improves after the stall phenomenon appears. Because rotating stall first occurs in the second rotor, its entropy production is higher than that of the first rotor over the entire evolution period. The high entropy generation region moves in the circumferential and radial directions of the first and second rotors during the evolution of rotating stall.

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“…Wu et al, performed, during stall mechanism, an investigation of frantic turbulence conditions. Yu et al, examined the separated flow and stall mechanism for wind turbines [30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Dimensional Analysis of Power Prediction of a Real-Scale Wind Turbine Based on Wind-Tunnel Torque Measurement of Small-Scaled Models

2018

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A preliminary study of a horizontal-axis wind turbine (HAWT) design is carried out using a wind tunnel to obtain its aerodynamic characteristics. Utilization of data from the study to develop large-scale wind turbines requires further study. This paper aims to discuss the use of wind turbine data obtained the wind-tunnel measurements to estimate the characteristics of wind turbines that have field size. One should measure the torque of two small-scale turbines inside the wind tunnel. The first small-scale turbine has a radius of 0.14 m, and the radius of the second small turbine is 0.19 m. Torque measurement results from both turbines were analyzed using the Buckingham π theorem to obtain a correlation between torsion and diameter variations. The obtained correlation equation was used to estimate the field measurement of turbine power with a radius of 1.2 m. The resulting correlation equation can be applied to approximate the energy generated by the turbine using the size of the field well in the operating area and the tip-speed ratio (λ) of the turbine design.

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A study of the energetic turbulence structures during stall delay

Cited by 13 publications

References 23 publications

A new stall delay algorithm for predicting the aerodynamics loads on wind turbine blades for axial and yawed conditions

A new stall delay algorithm for predicting the aerodynamics loads on wind turbine blades for axial and yawed conditions

Simulation of entropy generation during the evolution of rotating stall in a two-stage variable-pitch axial fan

Dimensional Analysis of Power Prediction of a Real-Scale Wind Turbine Based on Wind-Tunnel Torque Measurement of Small-Scaled Models

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