Special Issue "Selected Papers from the Conference on Modelling Fluid Flow (CMFF’18, 17th International Conference on Fluid Flow Technologies)"

Special Issue Editor

Guest Editor
Prof. János Vad

Department of Fluid Mechanics, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Bertalan Lajos u. 4-6, H-1111 Budapest, Hungary
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Interests: aerodynamics and aeroacoustics for fans and compressors; industrial air technology and ventilation

Special Issue Information

Dear Colleagues, 

The Conference on Modelling Fluid Flow (http://www.cmff.hu/), held in every third year in Budapest, Hungary, is an international conference series aiming at responding to the challenges in the rapidly developing fields of fluid mechanics. The conference series represents the state of the art in the collaborative fields of experimental and computational fluid dynamics. The conference represents the synergy and interaction among various fields of fundamental research, as well as fluids engineering applications. At CMFF'18, being the 17th event in the successful conference series, authors from more than 25 countries presented approximately 100 papers of a high quality. This Special Issue is a selection and furthers the development of the best turbomachinery- and power-related papers out of CMFF'18.

Prof. János Vad
Guest Editor

Published Papers (2 papers)

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Research

Open AccessArticle Numerical Modelling of the Ice Throw from Wind Turbines
Int. J. Turbomach. Propuls. Power 2019, 4(1), 4; https://doi.org/10.3390/ijtpp4010004
Received: 12 December 2018 / Revised: 6 February 2019 / Accepted: 11 February 2019 / Published: 26 February 2019
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Abstract
Ice throw is a significant risk factor in the vicinity of wind turbines located in cold climate areas. We present a method to estimate the ice chunk trajectories. First, similar to the common practice, only translation is accounted for and the object trajectory [...] Read more.
Ice throw is a significant risk factor in the vicinity of wind turbines located in cold climate areas. We present a method to estimate the ice chunk trajectories. First, similar to the common practice, only translation is accounted for and the object trajectory is determined by gravity and the aerodynamic drag force. The sensitivity of the trajectories to the launch positions, wind speed, turbine rotation and aerodynamic drag is assessed. Next, trajectory computations with six-degree-of-freedom motion are presented. The required aerodynamic forces and moments are precomputed using CFD. The results indicate that object rotation might be non-negligible when higher accuracy is needed for the trajectory estimates. Full article
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Open AccessArticle Numerical and Experimental Investigation of the 4-Quadrant Behavior of Different Mixed Flow Diffuser Pumps
Int. J. Turbomach. Propuls. Power 2019, 4(1), 3; https://doi.org/10.3390/ijtpp4010003
Received: 15 December 2018 / Revised: 20 January 2019 / Accepted: 30 January 2019 / Published: 7 February 2019
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Abstract
Besides operating a centrifugal pump under normal conditions there are additional operating conditions possible; for example, a pump operated as turbine. Another example would be a pump trip where there are several abnormal operating conditions possible when the direction of flow and/or the [...] Read more.
Besides operating a centrifugal pump under normal conditions there are additional operating conditions possible; for example, a pump operated as turbine. Another example would be a pump trip where there are several abnormal operating conditions possible when the direction of flow and/or the direction of rotation are changing. The machine behavior in every possible operation condition can be represented by the complete pump characteristics, often called the 4-quadrant (4Q) behavior of a centrifugal pump. To gather the 4Q behavior, a test rig allowing the flow direction as well as the rotation direction to be reverted is necessary, with time-consuming measurements at variable positive and negative discharge in both directions of rotation the complete pump characteristics are evaluated. In the present study, an approach to investigate the complete pump characteristics by means of computational fluid dynamics (CFD) calculations is presented. With steady-state calculations and additional transient CFD investigations in the normal operating conditions, the whole pump characteristics were calculated accurately. Two different types of mixed flow diffuser pumps were investigated—one equipped with adjustable impeller blades, the second one with comparable low specific speed. Experimental verifications have shown a remarkably good agreement. Furthermore, an exemplary numerical waterhammer analysis shows the successful application of the presented approach. Full article
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Int. J. Turbomach. Propuls. Power EISSN 2504-186X Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
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