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

A special issue of International Journal of Turbomachinery, Propulsion and Power (ISSN 2504-186X).

Deadline for manuscript submissions: closed (15 March 2019) | Viewed by 18483

Special Issue Editor

Prof. János Vad

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Guest Editor
Department of Fluid Mechanics, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Bertalan Lajos u. 4-6, H-1111 Budapest, Hungary
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

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Published Papers (4 papers)

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Research

13 pages, 5155 KiB  
Article
Exploration of Axial Fan Design Space with Data-Driven Approach
by Gino Angelini, Alessandro Corsini, Giovanni Delibra and Lorenzo Tieghi
Int. J. Turbomach. Propuls. Power 2019, 4(2), 11; https://doi.org/10.3390/ijtpp4020011 - 23 May 2019
Cited by 4 | Viewed by 3380
Abstract
Since the 1960s, turbomachinery design has mainly been based on similarity theory and empirical correlations derived from experimental data and manufacturing experience. Over the years, this knowledge was consolidated and summarized by parameters such as specific speed and diameters that represent the flow [...] Read more.
Since the 1960s, turbomachinery design has mainly been based on similarity theory and empirical correlations derived from experimental data and manufacturing experience. Over the years, this knowledge was consolidated and summarized by parameters such as specific speed and diameters that represent the flow features on the meridional plane, hiding however the direct correlations between all the actual design parameters (e.g., blade number or hub-to-tip ratio). Today a series of statistical tools developed for big data analysis sheds new light on correlations among turbomachinery design and performance parameters. In the following article we explore a dataset of over 10,000 axial fans by means of principal component analysis and projection to latent structures. The aim is to find correlations between design and performance features and comment on the capabilities of this approach to give new insights on the design space of axial fans. Full article
(This article belongs to the Special Issue Selected Papers from the Conference on Modelling Fluid Flow (CMFF’18, 17th International Conference on Fluid Flow Technologies))
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19 pages, 11035 KiB  
Article
Maximum Efficiency Despite Lowest Specific Speed—Simulation and Optimisation of a Side Channel Pump
by Markus Mosshammer, Helmut Benigni, Helmut Jaberg and Juergen Konrad
Int. J. Turbomach. Propuls. Power 2019, 4(2), 6; https://doi.org/10.3390/ijtpp4020006 - 27 Mar 2019
Cited by 7 | Viewed by 5835
Abstract
Side channel pumps provide high pressure at relatively low flow rates. This comes along with a quite low specific speed and thus with the known disadvantage of a quite poor maximum efficiency. This paper describes the detailed analysis and optimisation of a typical [...] Read more.
Side channel pumps provide high pressure at relatively low flow rates. This comes along with a quite low specific speed and thus with the known disadvantage of a quite poor maximum efficiency. This paper describes the detailed analysis and optimisation of a typical 1-stage side channel pump with an additional radial suction impeller by means of computational fluid dynamics (CFD) simulations. In a first step, the model was successively generated and it was obvious that it has to contain all details including suction impeller and main stage (both 360° models) as well as the pressure housing and all narrow gaps to provide useful simulation results. Numerical simulations were carried out in a stationary and transient way with scale resolving turbulence models to analyse the components in detail. Finally the CFD-simulations were validated with model tests. For the optimisation process it was necessary to generate a reduced numerical model to analyse the effects of more than 300 geometry variations. The findings were then combined to establish the desired objectives. Finally the best combinations were validated again with the full numerical model. Those simulations predict a relative efficiency increase at best efficiency point (BEP) and part load >30% with respect to all given limitations like identical head curve, suction behavior, and dimensions. Full article
(This article belongs to the Special Issue Selected Papers from the Conference on Modelling Fluid Flow (CMFF’18, 17th International Conference on Fluid Flow Technologies))
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14 pages, 530 KiB  
Article
Numerical Modelling of the Ice Throw from Wind Turbines
by Róbert-Zoltán Szász, Alexandre Leroyer and Johan Revstedt
Int. J. Turbomach. Propuls. Power 2019, 4(1), 4; https://doi.org/10.3390/ijtpp4010004 - 26 Feb 2019
Cited by 3 | Viewed by 3319
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
(This article belongs to the Special Issue Selected Papers from the Conference on Modelling Fluid Flow (CMFF’18, 17th International Conference on Fluid Flow Technologies))
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18 pages, 8329 KiB  
Article
Numerical and Experimental Investigation of the 4-Quadrant Behavior of Different Mixed Flow Diffuser Pumps
by Stefan Höller, Helmut Benigni and Helmut Jaberg
Int. J. Turbomach. Propuls. Power 2019, 4(1), 3; https://doi.org/10.3390/ijtpp4010003 - 7 Feb 2019
Cited by 9 | Viewed by 5093
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
(This article belongs to the Special Issue Selected Papers from the Conference on Modelling Fluid Flow (CMFF’18, 17th International Conference on Fluid Flow Technologies))
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