Browsing by Author "Delgado, A."
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A Complete procedure for predicting and improving the performance of HAWT's
Al-Abadi, A.; Ertunç, Özgür; Sittig, F.; Delgado, A. (IOP Publishing, 2014)A complete procedure for predicting and improving the performance of the horizontal axis wind turbine (HAWT) has been developed. The first process is predicting the power extracted by the turbine and the derived rotor ... -
A design and optimization method for matching the torque of the wind turbines
Al-Abadi, A.; Ertunç, Özgür; Weber, H.; Delgado, A. (AIP Publishing, 2015)An aerodynamic shape optimization method for a horizontal axis wind turbine is developed and verified through experimentation with a laboratory-scale wind turbine. Our method is based on matching the rotor's and the coupled ... -
From passive to active pitch regulation of wind turbines: Optimization method with numerical validation
Al-Abadi, A.; Kim, Y.; Park, J.-Y.; Kang, H.; Ertunç, Özgür; Delgado, A. (ASME, 2015)An optimization method that changes the control strategy of the Horizontal Axis Wind Turbine (HAWT) from passive- to active-pitch has been developed. The method aims to keep the rated power constant by adjusting the blade ... -
High-speed visualization of acoustically excited cavitation bubbles in a cluster near a rigid boundary
Vaidya, H. A.; Ertunç, Özgür; Lichtenegger, T.; Hachmann, J.; Delgado, A.; Skupin, A. (Springer Berlin Heidelberg, 2017)In the present work, high-speed visualizations at one million frames/s have been used to study the oscillation characteristics of acoustic cavitation bubbles. The bubbles are generated by acoustic cavitation using an ... -
Interaction between free-stream turbulence and tip-vortices of wind turbine blades with and without winglets
Al-Abadi, A.; Kim, Y.; Ertunç, Özgür; Epple, P.; Delgado, A. (IOP Publishing, 2018)Experimental investigations of the free-stream turbulence impact on the tip-vortices generated in wind turbine blades have been performed. The investigation is done by exposing an efficient laboratory scale wind turbine ... -
Numerical and experimental analysis of impinging synthetic jets for cooling a point-like heat source
Glowienko, G.; Derlien, H.; Ertunç, Özgür; Delgado, A. (ASME, 2018-05-01)High power light emitting diodes (LEDs) being used for low and high beam in automotive lighting need active cooling of their heat sinks by radial or axial fans. But the moving elements of the fan cause abrasion, noise, and ... -
Numerical and experimental analysis of the flow and transition of free synthetic jets
Glowienko, R.; Derlien, H.; Ertunç, Özgür; Delgado, A. (IOP Publishing, 2019-04)In this paper, flow characteristics and the transition of synthetic jets are investigated numerically and experimentally. The investigated synthetic jets have a dimensionsless stroke length L-0/d of 146 and 167, an U-0 of ... -
The penetration of acoustic cavitation bubbles into micrometer-scale cavities
Vaidya, H. A.; Ertunç, Özgür; Lichtenegger, T.; Delgado, A.; Skupin, A. (Elsevier, 2016)The penetration of acoustically induced cavitation bubbles in micrometer-scale cavities is investigated experimentally by means of high-speed photography and acoustic measurements. Micrometer-scale cavities of different ... -
A torque matched aerodynamic performance analysis method for the horizontal axis wind turbines
Al-Abadi, A.; Ertunç, Özgür; Weber, H.; Delgado, A. (Wiley, 2013-11)An analysis method is developed to test the operational performance of a horizontal axis wind turbines. The rotor is constrained to the torque–speed characteristic of the coupled generator. Therefore, the operational ... -
Turbulence impact on wind turbines: experimental investigations on a wind turbine model
Al-Abadi, A.; Kim, Y. J.; Ertunç, Özgür; Delgado, A. (IOP Publishing, 2016)Experimental investigations have been conducted by exposing an efficient wind turbine model to different turbulence levels in a wind tunnel. Nearly isotropic turbulence is generated by using two static squared grids: fine ...
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