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National Repository of Grey Literature

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	Noise reduction oriented optimization of UAV propellers Ecler, Matěj ; Matějů, Jiří (referee) ; Popela, Robert (advisor) This diploma thesis deals with optimization of propellers with the aim to reduce their noise level. Based on the measurement of noise level of serial propellers, major propeller noise sources were evaluated. Subsequent 2D simulations of the flow on the individual profiles along the propeller span revealed the locations of separation bubbles, which were identified as a potential source of the noise. Based on these findings, propellers were equipped with turbulator trips of various dimensions and their effect on the noise level and efficiency of the propellers was experimentally verified. The results did not show contribution of turbulator trips to noise reduction or efficiency. Detailed record
	Noise reduction oriented optimization of UAV propellers Ecler, Matěj ; Matějů, Jiří (referee) ; Popela, Robert (advisor) This diploma thesis deals with optimization of propellers with the aim to reduce their noise level. Based on the measurement of noise level of serial propellers, major propeller noise sources were evaluated. Subsequent 2D simulations of the flow on the individual profiles along the propeller span revealed the locations of separation bubbles, which were identified as a potential source of the noise. Based on these findings, propellers were equipped with turbulator trips of various dimensions and their effect on the noise level and efficiency of the propellers was experimentally verified. The results did not show contribution of turbulator trips to noise reduction or efficiency. Detailed record
	The Influence of Passive and Active Method of Flow Control Jakubec, V. ; Matějka, M. ; Popelka, Lukáš ; Schmirler, M. ; Pohl, L. The study of influence of active flow control has been carried out experimentally on airfoil with flap with use of synthetic jet actuator. PIV has been used for visualization. Furthermore the results of separation bubble visualization have been shown with the effect of passive flow control by turbulator strip. Detailed record
	Vícekriteriální návrh leteckých profilů pro kluzáky Popelka, Lukáš ; Müller, M. ; Matějka, M. ; Nožička, J. The article presents results of multicriteria design of airfoils suited for sailplanes. Airfoils for root and tip wing section as well as for empennage has been designed. The use of turbulators has been proposed on two older airfoils and the possibilities of drag reduction has been discussed. Detailed record

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