This diploma thesis deals with the flow modelling in the ejector using the FLUENT software. It develops a diploma thesis created in the past, where a mathematical flow model in the ejector was created and experimentally tested. The aim of this work is to analyze the ejector calculations and to model a flow in an ejector of the same shape as in the experiment and under the same conditions, too. Another objective was to assess the influence of the throat length and to examine if the pressure in the ejector mixing chamber remains constant. Finally, the disagreement between the experimental figures and the ones gained from the mathematical model of the ejector are discussed.

Diploma thesis is focused on self-priming pump 25 - OVE Sigma pumpy Hranice s.r.o., for its function is essential the ejector which is placed in the body of the pump. On the basis of the results of measurements there are designed construction modifications using a mathematical model. For the first time were made measurements to verify the self-priming capability with determining the maximum suction height.

Diploma thesis solves project of the hydraulic blankholder/ejector for the mechanical press. On the basis of defined parameters are carried out the analysis of crank mechanism, necessary calculations, analyse of all suggested alternatives, project of hydraulic system and specification of hydraulic components. Tutorials took place in company ŽĎAS, a.s. and project is performed on the basis of the suggestions, advices and recommendations of Hydraulic systems department of this company.

En framtida alternativ framdrivningsmetod av fartyg skulle kunna vara en ångjetstråle som expanderas via en ejektor. Syftet med studien var att utföra ett experiment med två olika typer av utloppsmunstycken på ejektorns diffusor, för att därigenom ta reda på vilken design som lämpar sig för denna framdrivningsmetod samt vilken tryckkraft som är möjlig att uppnå. Studiens resultat är tänkt att användas som underlag för fortsatta studier om fartygsframdrift med ångjetstråle via en ejektor, för att eventuellt kunna öka energieffektiviteten i jämförelse med dagens framdrivningsmetoder. Resultatet visar att en cirkulär strålbild ger högst tryckkraft trots ett lägre inloppstryck vid en vattentemperatur på 70 °C i jämförelse med en platt strålbild vid ett högre inloppstryck och samma temperatur. Experimentet gav ingen mätbar tryckkraft vid expansion av fuktig ånga med ett tryck på 3 MPa och en temperatur på 150 °C. / A future alternative propulsion method of ships could be a steam jet that is expanded via an ejector. The purpose of the study was to conduct an experiment on two different types of outlet nozzles on the diffuser of the ejector. This was carried out to find which design that is suitable for this propulsion method and what propulsion force that was possible to achieve. The result of the study was then thought to be used as a basis for further studies of steam jet propulsion through an ejector, to possibly increase the energy efficiency in comparison with today's propulsion methods. The result shows that a circular jet provides maximum propulsion force despite a lower inlet pressure and a water temperature at 70 °C in comparison with a flat jet at higher inlet pressures and equal temperature. The experiment gave no measurable propulsion force when expanding wet steam at a pressure of 3 MPa and a temperature at 150 °C.

This diploma thesis deals with the area of ejectors. In the intoduction, an ejector is classed as an hydraulic machine. There is also an introduction of the principle and application of this machine there. The next part describes two different ways of calculation and there is a suggestion how to get characteristics, that were achieved by calculation in MS Excel, projected. The purpose of this diploma thesis is to confront this mathematical model with the experiment done in school laboratory at Kaplan department of hydraulic machines. The description of this experiment and the evaluation procedure of measured values is described in the final part of this diploma thesis.

The main Target of this diploma is to find some reconciliation with cooperation of turbine and ejector. This work is containing informations about this mechanisms and also its historical development. The merits of this diploma thesis is thermodynamics calculation and proposal of main parameters and proportions of the turbine and the ejector. After this it is follow by the calculation of whole system of the turbine and ejector in consequence with calculation of turbine with by-pass regulation and also comparison of power output with ejector and with by-pass technology.

This diploma thesis deals with reducing the time of sucking water into the rotating impeller of the centrifugal pump as used in firesport. The suction is carried out by the ejector, which is powered by combustion engine exhaust gases. A mathematical model was created, which shows the flow in the ejector. It was also used as a basis for the creation of a new ejector, which has an increased airflow when getting closer to atmospheric pressure.

The object of the diploma thesis is to optimize vacuum function of the ejector using computional fluid dynamics, or CFD. The ejector is inserted to the intake system of the six - cylinder diesel engine to increase the pressure gradient of the exhaust gas recirculation system. The analysis of the current design solution is performed and then the ejector with the new shape affording higher vacuum effect is proposed. The introductory part is devoted to the questions of diesel engines emissions and technology to reduce emissions in the exhaust system focused on the EGR.

Aim of the diploma thesis is to design intake ducting with variable cross-section for 16V diesel engine consisting from divided intake manifold and divided ejector. Cross-section variability is ensured by a swirl flap placed in the divided ejector. Next aim of thesis is to provide drawing documentation for production of samples. For designing was used PTC Creo system and software GeomCaliper. Also was taken account of manufacturing of the parts with sand-casting, especially to guarantee trouble-free taking out of models from the moulds, and taking out of cores from core moulds, and also for machinability of some elements. Introduction of thesis is focused on diesel engine emissions and ways of their reduction.

Master thesis deals with design of combusting chamber for gaseous fuels with predicted thermal output less than 30 kilowatts. Designed equipment will be used as a generator of flue gases with required parameters further used for experimental catalytic unit. Due to the need of draft creation inside the combustion chamber and exhaust pipe is master thesis also deals with design of ejector nozzle, which will be used for this purpose. Opening chapters of this work, considering a theoretical part, are focused on basic classification of combustion chambers and industrial burners. Next and main chapter is dedicated to main goal of this work, which is combustion chamber design, containing necessary calculations divided into balance calculation and construction design. Final chapters deals with above mentioned calculation of ejector nozzle ensuring sufficient draft and also sufficient cooling of flue gases incoming from catalytic unit.