Profile of the branch:|
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.
Key learning outcomes:|
Occupational profiles of graduates with examples:|
Issued topics of Doctoral Study Program:|
- A study of the vortex flow structures in a heart compensation devices
Research of the solutions of the fluid flow in pumps used as cardiac compensation, 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. The work follows the requirements of the GAČR nr. GA17-19444S (Interaction of heterogeneous liquid with flexible wall).
- Cavitation erosion model
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. This topic is very suitable for graduates of the specialized branch Mathematical engineering.
- Control of the fluid stream in the open channels
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.
- Diagnostic of hydraulic machines with measurement of acoustic emission
The thesis will be focused on usage of acoustic emission measurement in hydraulic machines. ČEZ promised a support and acoustic emission sensors will be installed in power plants.
- Digital image processing used for measurement of fluid phenomena
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.
- Disc friction loss in centrifugal pumps and hydraulic turbines
Disc friction loss presents significant part of the total hydraulic loss, especially in low-specific speed hydraulic machines. Goal of the PhD study will be analytical investigation of the disc friction loss and analysis of the shape of the rotor-stator clearance on the magnitude of the loss. The latter task will be carried out with help of experimental and computational modeling (CFD).
- Eigen and forced oscillation of the liquid in the flexible tube
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.
- Elimination of microorganisms using cavitation
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.
- Radial – axial pump with counter rotating runners
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).
- Reduced order model of the swirling flow
Flow with strong vortical structures (e.g. vortex rope in hydraulic turbine draft tube) can be described by reduced order model. Goal of the PhD thesis is to set up such model for turbulent flow in off-design operating point of Francis turbine. Model will be the starting point for control of the draft tube flow to eliminate the pressure pulsations induced by vortex rope. Model will be derived from CFD simulations (Large Eddy Simulation) and PIV measurements. Both computational and experimental works will be within project of the Czech Science Foundation „3D Instability of a Shear Layer in Adverse Pressure Gradient“.
- Rotating stall in centrifugal pump
Rotating stall appears during operation of centrifugal pumps outside of the best effciency point. This phenomenon significantly influences their dynamical properties. Rotating stall in case of reversible pump turbines has adverse effect on stability of the characteristic curve and limits the zone of operation. Conditions leading to rotating stall will be investigated using especially CFD tools.
- The optimalization of the number of blades of swirl turbine for given parameters.
The runner with two blades is used in the development of the swirl turbine for small heads and large discharges.
Two blades are very harmful for cavitation and suction head is very small, in many causes it is negative. The study will be supported by the project MPO no. FR-TI3/712 “Research and development of systems for low – head water power plants
The optimalization of blades of swirl turbine will be aimed to the runners with essentially higher number of blades, but relatively very short to prevent the main advantage of swirl turbine – large discharge.
The cavitation properties would be better too.