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This paper contents theory interpretation of a propeller in yaw and experimental results of tests to determine the thrust, power and efficiency characteristics of a propeller Bambula 18×8 at various angles of yaw from 0° to 90°. The results of the wind tunnel tests can contribute to completing the aerodynamic calculation of fixed-pitch propeller aircraft especially for multicopters, whose rotors are...
This paper gives an insight into the modeling of unsteady flows over a NACA 0012 pitching airfoil using computational fluid dynamics. The theoretical background of unsteady viscous flows is presented, followed by a description of the CFD simulation. Obtained aerodynamic characteristics are presented, and an analysis of the data is given.
The current strict emission regulations lead to fuel injection being inevitable in internal combustion engines. Complex high pressure injection is not always applicable in small two stroke engines which are preferred to be light, cheap and simple. Therefore development of simple low pressure injection system is desirable. This paper describes set up of scavenging flow simulation in ANSYS FLUENT which...
A small strain gage measurement system was developed at the University of Defence in Brno. The system relays on N1 CompactDAQ hardware and LabVIEW software. The system serves as a functional demonstrator for larger systems, which will be designed in the future. The wiring can cause significant problems as the physical dimensions expand and, therefore, it was decided to solve the data transfer wirelessly...
The paper deals with the optimization of the ratio between cylinder diameter and diameter of dimples on a cylinder surface by using the CFD (Computational Fluid Dynamics) simulation. The aerodynamic drag is minimized. The low-cost simulation approach was applied to be run on a common PC using the commercial software ANSYS CFX. Results for six dimpled cylinder geometry cases are presented and differences...
This study deals with application of CFD (Computational Fluid Dynamic) numerical methods to design of components of wind tunnels. In this study, a rectangular nozzle section of a circular wind tunnel located at Department of Air Force and Aircraft Technology was chosen for the analysis. ANSYS Fluent was used to depict and analyze velocity profiles leaving the nozzle as main air flow inputs into a...
This paper provides an insight into the unsteady aerodynamic phenomena related to real-world applications, especially with regard to tactical aircraft. The physical model of unsteady flows and related processes is described, followed by a description of its impact on airplane applications. Further, a description of a wind tunnel experiment is given.
The paper deals with problems of CFD simulating airflow over a dimpled spherical surface and its validation by the wind tunnel testing. The low-cost simulation approach was applied to be run on a common PC using the commercial software ANSYS CFX. The wind tunnel testing has been performed in the laboratory of aerodynamics at the Department of Air Force and Aircraft Technology of the University of...
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