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Volumetric losses
Feldová, Petra ; Sluše, Jan (referee) ; Klas, Roman (advisor)
The main goal of this bachelor thesis is to evaluate the flow of sealing gaps and assess the impact of the expansion chambers of various shapes , placing them in order to reduce volumetric losses . The first section summarizes theoretical knowledge of pumps, which suffer the most from these losses. There are also described the analytic solutions of flow in the cracks and possible use of simulation programs, such as Fluent, for investigation of more difficult tasks. The computational part compares analytically determined values of the volume flow for smooth gap, with the values obtained from the program Fluent. Thanks to the values from this program is also possible to assess the effect of rotation on the flows. Analytical relationships do not include this impact . For easier comparison the flow in the expansion chambers are further drawn contours of the static pressure, velocity vectors and pathlines in their cross-section.
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Sports car rear wing numerical optimization
Feldová, Petra ; Rudolf, Pavel (referee) ; Štefan, David (advisor)
This master’s thesis is focused on optimization of rear wing of sport car by using open-source software. The optimization of 2D profile of the rear wing is present in this thesis. Python environment was chosen for optimization and evolutionary algorithm was is used as optimization function. This algorithm is further connected to Xfoil software, which is computing aerodynamic characteristic. The ratio of the lift and drag coefficients (C_L/C_D) is chosen as parameter which considers the aerodynamic efficiency. The CFD computation of flowing around the whole car is provided in open-source software OpenFOAM. . The profile optimization results to approximately 7.9 % raise of the parameter C_L/C_D, in the same wing stability. The main benefit of this work is to use open-source software for the optimization and CFD analysis, which in future might save company’s resources by not buying expensive commercial software licenses.
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Sports car rear wing numerical optimization
Feldová, Petra ; Rudolf, Pavel (referee) ; Štefan, David (advisor)
This master’s thesis is focused on optimization of rear wing of sport car by using open-source software. The optimization of 2D profile of the rear wing is present in this thesis. Python environment was chosen for optimization and evolutionary algorithm was is used as optimization function. This algorithm is further connected to Xfoil software, which is computing aerodynamic characteristic. The ratio of the lift and drag coefficients (C_L/C_D) is chosen as parameter which considers the aerodynamic efficiency. The CFD computation of flowing around the whole car is provided in open-source software OpenFOAM. . The profile optimization results to approximately 7.9 % raise of the parameter C_L/C_D, in the same wing stability. The main benefit of this work is to use open-source software for the optimization and CFD analysis, which in future might save company’s resources by not buying expensive commercial software licenses.
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Volumetric losses
Feldová, Petra ; Sluše, Jan (referee) ; Klas, Roman (advisor)
The main goal of this bachelor thesis is to evaluate the flow of sealing gaps and assess the impact of the expansion chambers of various shapes , placing them in order to reduce volumetric losses . The first section summarizes theoretical knowledge of pumps, which suffer the most from these losses. There are also described the analytic solutions of flow in the cracks and possible use of simulation programs, such as Fluent, for investigation of more difficult tasks. The computational part compares analytically determined values of the volume flow for smooth gap, with the values obtained from the program Fluent. Thanks to the values from this program is also possible to assess the effect of rotation on the flows. Analytical relationships do not include this impact . For easier comparison the flow in the expansion chambers are further drawn contours of the static pressure, velocity vectors and pathlines in their cross-section.
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