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Original title in Czech: Konstrukční a procesní inženýrstvíFSIAbbreviation: D-KPIAcad. year: 2018/2019Specialisation: Fluid Engineering
Programme: Machines and Equipment
Length of Study: 4 years
Accredited from: 1.1.1999Accredited until: 31.12.2020
Profile
Design and Process Engineering · Designing, construction, calculation, technology of manufacturing, technical preparation of manufacturing including assembly and testing, · Thermal and nuclear power plant devices such as steam and combustion turbines, steam generators, steam power plants and heating plants including nuclear power stations, industrial power engineering and their environmental aspects, · Water turbines, hydrodynamic and hydrostatic pumps, piping systems, hydroelectric power plants, and pumping stations, · Machinary and devices for chemical industry, food-stuff industry, and biotechnological treatment lines, · Construction, modelling and theoretical studies of machines and devices for cutting, forming machines, industrial robots, and manipulators, · Machine parts and mechanisms, methodology of designing machine elements and working mechanisms of general application with consideration of stochastic qualities of inputs, including the application of special types of machines and devices, · Cars, vans and lorries, buses, trailers, semi-trailers, and motorcycles, · Combustion engines for all types of vehicle drives, simulation of combustion engine thermomechanical systems, dynamics of driving gear, engine accessories, ecology, · Machines and devices for in-plant handling of material and handling between operations, for the mining and transport of building materials, for passenger conveyance in buildings, · Aerodynamic calculation and designing, flight mechanics, fatigue and durability of aircraft constructions, aeroelasticity of aircraft, · Quality of machine industry production.
Guarantor
prof. Ing. Václav Píštěk, DrSc.
Issued topics of Doctoral Study Program
Research of the solutions of the fluid flow in journal bearings. The study of vortex structures typical for such devices, the selection of a suitable and commonly used equipment for experiments, computer modeling and prediction of the desirable and undesirable vortex structures, design modifications of existing bearings based on the simulation results. Simulations and experiments extended into the effect of magnetic fluid.
Tutor: Fialová Simona, doc. Ing., Ph.D.
Research of the solutions of the fluid flow in pumps used as cardiac compensation and the mechanical heart valves. The study of vortex structures typical for such devices, the selection of a suitable and commonly used equipment for experiments, computer modeling and prediction of the desirable and undesirable vortex structures, design modifications of existing heart pumps based on the simulation results.
Fractal geometry is based on self-similar shapes and is very frequent in nature (e.g. plant leaves). Therefore it is suggested to use the fractal geometry for design of fluid devices and elements, where it might lead to decrease of pressure losses and pulsations or extension of the operating range. Research within the PhD thesis will be extension of previous successful application of fractal geometry at our department (design of fractal orifices) and will exploit both computational simulations and experimental modelling.
Tutor: Rudolf Pavel, doc. Ing., Ph.D.
Cavitation phenomenon has its negative (cavitation erosion) and positive (e.g. water disinfection) aspects. Results of our experimental and computational modelling show that huge pressure pulsations are associated with passing of the pressure wave through bubbly flow. Sudden synchronized collapse of cavitation bubbles gives rise to pressure pulsations with significant destructive potential. Research within the PhD thesis will focus on experimental modelling of this phenomenon (pressure measurements, high-speed video) and CFD modelling with the aim to set up a 1D model, which will describe both qualitatively and quantitatively the sudden collapse of the cavitation cloud.
Cavitation, i.e. local inception of vapor bubbles due to low presure, can occur during operation of hydraulic machines. Consequent condensation (collapse) of the bubbles generates strong pressure pulses, which cause erosion of the machine surface. Goal of the PhD study is to create description of the vapor bubble behavior and then predict locations of the erosion and its intensity, i.e. to set up a cavitation erosion model. Model will be mainly based on numerical solution of Rayleigh-Plesset equation, which describes change of the bubble radius in variable pressure field. Model will be experimentally validated in hydraulic lab of our department and in cooperation with material engineers.
It is necessary to solve a problem of a balanced inflow to water turbines in case of hydropower plants. A velocity profile before water turbine inlets can be unsuitable for turbine operation. It can be caused by wrong shape of an intake channel. Some water turbine can be fed better than the other one. It influences a power and efficiency of the turbines. This problem is possible to solve by changing shape of intake channel or by inserting of a rib. The change of channel shape is more often restricted by a zoning plan. An inserting of the rib into the channel leads to the cross-section area decreasing and losses increasing. The aim of this thesis will be to find different solutions how to adjust the velocity profile in accordance with the turbine intake requirements. Some of these new solutions are the utilizing of the vortex structures to modifying the velocity profile or inserting of some shaped parts to modify the velocity profile. Problem will be solved with help of the CFD calculations. If it is possible it will be verified by experiment. Student will solve this problem under project of specific research in scope of Victor Kaplan’s Department of Fluid Engineering.
Tutor: Štigler Jaroslav, doc. Ing., Ph.D.
The work will focus on the creation of new long-distance water transport technology. Part of the technology will be a mathematical model and computational simulation of pressure pulsations and water hammer protection. The dynamics and function of water reservoirs for irrigation will be solved.
Tutor: Pochylý František, prof. Ing., CSc.
A mathematical model of interaction of the rotating element with magnetic fluid will be created and verified by the experiment within the study.
Thesis will focus on a digital image processing of video sequences captured during hydraulic phenomena. Watching the cavitation of inlet vortices and similar phenomena, which could be caught with a high-speed camera, will be the main part of the work.
Tutor: Habán Vladimír, doc. Ing., Ph.D.
A mathematical model of various dynamic shock absorbers will be developed to suppress hydrodynamic instabilities and pressure pulsations.
Work will focus on the study of the interaction of compressible fluid with a flexible wall of the tube. It follows the project GACR project GA17-19444S (Interactions heterogeneous liquid with flexible wall). Results will be used both in the biomedical field and in the design of new hydrodynamic systems; for example damping of the water hammer.
Cavitation is not only negative phenomenon in operation of hydraulic machines, but can be also positively exploited for water desinfection. PhD student will focus especially on mechanical effects leading to desintegration of cyanobacteria and bacteria during cavitation proces. Investigation will be based on experimental testing on cavitation circuit in V. Kaplan Dept. of Fluid Engineering and computational simulations (CFD) . Goal of the thesis will be to describe effect of cavitation bubble implosion on cyanobacteria and bacteria cells for different operating conditions and different types of cavitation devices.
Same model for computation of hydraulic losses is used for steady and unsteady flows in numerical modeling. However this approach is very inaccurate when damping is evaluated. Losses can be modeled using the second viscosity, but for high steady velocities its influence should be included into the model.
In the interior of hydraulic machines there is vibration of mechanical parts and pressure pulsations in the flowing fluid. These two phenomena can not be separated from one another and must be solved together. At present, there is a frequent approach to determining additional fluid spills in mechanical parts. Methodology for determining these properties will be developed.
In water distribution networks and in process industry there is a need to reduce the pressure using reduction valves. Recently an effort appeared to recuperate the pressure energy in centrifugal pumps running in turbine mode. Experimental research and computational modelling will be carried out within PhD thesis to understand connection between pump and turbine mode of operation (estimation of turbine characteristic curve, influence of impeller modicifications on turbine mode of operation).
This theme will be aimed to multistage pumps (radial-axial), without stator vanes. The stator vanes will be replaced by next counter-rotating impeller. This solution will be applied to runners for low specific speed (radial-axial runners).
Tutor: Haluza Miloslav, doc. Ing., CSc.
The new mathematical model of the fluid flow trhough pipe junction was developed at the Departmnet of Fluid Engineering. This mathematical model was prooved for the steady fluid flow in pipe junction. It is necessary to prove it also for unsteady fluid flow and if it is necessary, modify it in agreement with expreiments.
Study plan wasn't generated yet for this year.