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Browsing Fakulta strojní by Author "Dvořák, Václav"
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- ItemNávrh nadzvukového aerodynamického tunelu(Technická Univerzita v Liberci, 2014) Kracík, Jan; Dvořák, VáclavTato práce se zabývá návrhem nadzvukového aerodynamického tunelu. Tunel se skládá z experimentálního variabilního měřicího prostoru a nové koncepce ejektoru. U měřicího prostoru je uvažováno s nadzvukovými tryskami pro tři různá Machova čísla. Dále je kanál měřicího prostoru upraven tak, aby bylo možné studovat vznik šikmých rázových vln a dalších procesů. Ejektor byl navržen s dvanácti kruhovými vyměnitelnými hnacími tryskami a předpokládanou maximální dosahovanou účinností 25%. Navržený ejektor a měřicí prostor byly numericky ověřeny v programu Ansys Fluent 15.0. Vyrobený a sestavený nadzvukový ejektor byl experimentálně proměřen pro různý počet současně zapnutých hnacích trysek.
- ItemRekuperační výměníky(Technická Univerzita v Liberci, 2011) Veselý, Michal; Dvořák, VáclavThis work deals with the measurement and calculation of the heat recovery exchanger. This is a multi-plate and plate heat recovery heat exchanger with cross flow of work materials are also included numerical models used for flow visualization. The first part is an introduction to the problem of heat recovery and heat recovery equipment theoretical designs. The second part deals with possible methods for the measurement and creation of numerical models in Fluent. The third section focuses on the actual measurement and evaluation of the data.
- ItemTrubkové výměníky tepla voda-vzduch(Technická Univerzita v Liberci, 2012) Jonáš, Petr; Dvořák, VáclavThe main point of this thesis was to investiged possibilities of using CFD methods for design of heat exchangers. Detail model of finned tube bank was made and the numerical simulation was applied to it. Geometry of detail model was gradually simplified and results of each numerical simulation were compared with detail model. Analytical calculations and experimental measurement were performed to prove results aquired by numerical simulation. Evaluation of results aquired analytically, experimentally and with use of CFD methods was made in conclusion.
- ItemVariabilní měřící prostor pro supersonický aerodynamický tunel(Technická Univerzita v Liberci, 2011) Stupka, Oldřich; Dvořák, VáclavDiploma thesis deals with design, construction and testing of a variable test section. For its initial operations, three different nozzles for Mach numbers 1.4, 1.8 and 2.2 were made. These nozzles were designed using the method of characteristics. A Part of this work was to design and build a program to calculate the shape of jets using this method. Proposed profiles were simulated in software Fluent to verify the validity of the method of characteristics. During the experimental measurements in the laboratory of high speed in the Institute of Thermodynamics AVČR, images of the flow field using the colour schlieren method was taken. These were compared with numerical simulations and calculations using 1D method.