The rotor theories by Professor Joukowsky: Vortex theories

Okulov, Valery; Sørensen, Jens Nørkær; Wood, David

doi:10.1016/j.paerosci.2014.10.002

Cited by 91 publications

(53 citation statements)

References 69 publications

(165 reference statements)

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“…At the downstream cross-sections, it can be observed that the rotor wake recovers slower than the wake of the disc. This fact is in agreement with previous investigations [19][20]. The strengths of the two wakes differ because the deficit of the axial velocity in the near wake of the rotor, here up to 6D, is still influenced by the azimuthal vorticity originating from the tip vortices behind the rotor ( fig.…”

Section: Experimental Methods and Resultssupporting

confidence: 93%

Development and interaction of rotor wakes

Sørensen

Mikkelsen

Kabardin

et al. 2018

J. Phys.: Conf. Ser.

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Section: Experimental Methods and Resultssupporting

confidence: 93%

Development and interaction of rotor wakes

Sørensen

Mikkelsen

Kabardin

et al. 2018

J. Phys.: Conf. Ser.

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“…According to Kutta-Joukowski theorem [30], the circulation is a function of the induced velocity, which leads to the uncertainty of circulation. It is difficult to get an analytical expression about the induced velocity without any simplification; therefore the method which separates infinite skew cylinders into finite skew cylinders is adopted as shown in Figure 5.…”

Section: Error Correction Schemementioning

confidence: 99%

A Correction Method for UAV Helicopter Airborne Temperature and Humidity Sensor

Fan

et al. 2017

Mathematical Problems in Engineering

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This paper presents a correction method for UAV helicopter airborne temperature and humidity including an error correction scheme and a bias-calibration scheme. As rotor downwash flow brings measurement error on helicopter airborne sensors inevitably, the error correction scheme constructs a model between the rotor induced velocity and temperature and humidity by building the heat balance equation for platinum resistor temperature sensor and the pressure correction term for humidity sensor. The induced velocity of a spatial point below the rotor disc plane can be calculated by the sum of the induced velocities excited by center line vortex, rotor disk vortex, and skew cylinder vortex based on the generalized vortex theory. In order to minimize the systematic biases, the bias-calibration scheme adopts a multiple linear regression to achieve a systematically consistent result with the tethered balloon profiles. Two temperature and humidity sensors were mounted on "Z-5" UAV helicopter in the field experiment. Overall, the result of applying the calibration method shows that the temperature and relative humidity obtained by UAV helicopter closely align with tethered balloon profiles in providing measurements of the temperature profiles and humidity profiles within marine atmospheric boundary layers.

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“…This method for infinitely many blades was called the blade element momentum (BEM) theory. The development continued with a derivation of the Kutta-Joukowsky theorem (Valery L Okulov, Sørensen, & Wood, 2014).…”

Section: Introductionmentioning

confidence: 99%

Performances and Stall Delays of Three Dimensional Wind Turbine Blade Plate-Models with Helicopter-Like Propeller Blade Tips

Sutrisno

Deendarlianto

Indarto

et al. 2017

MAS

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The research on three dimensional (3-D) wind turbine blades has been introduced (Sutrisno, Prajitno, Purnomo, & B.W. Setyawan, 2016). In the current experiment, the 3-D wind turbine blades would be fitted with helicopter-like blade tips and additional fins to the blade hubs to demonstrate some laminarizing features.It was found that additional helicopter-like blade tip to the turbine blade creates strong laminar flows over the surface of the blade tips. Supplementary, finned hub, fitted to the blade body, creates rolled-up vortex flows, weakens the blade stall growth development, especially for blades at high-speed wind. A proposed mathematical form of modified lifting line model has been developed to pursue further 3-d blade development study of 3-d wind turbine blade.Rolled up vortex effects, developed by finned of the base hub, has been acknowledged could demolish the turbulent region, as well as laminarize the stall domain to intensify the induced wind turbine blade lift.

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The rotor theories by Professor Joukowsky: Vortex theories

Cited by 91 publications

References 69 publications

Development and interaction of rotor wakes

Development and interaction of rotor wakes

A Correction Method for UAV Helicopter Airborne Temperature and Humidity Sensor

Performances and Stall Delays of Three Dimensional Wind Turbine Blade Plate-Models with Helicopter-Like Propeller Blade Tips

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