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Experimental Investigation of Buzz Frequency on an Axisymmetric Supersonic Air Intake Using Pressure Distribution on the Wind Tunnel Wall
, M.Sc. Thesis Sharif University of Technology ; Soltani, Mohammad Reza (Supervisor) ; Farahani, Mohammad (Co-Advisor)
Abstract
Supersonic intakes with mixed compression has an appropriate performance in the critical point, but in the subcritical performance, when inlet mass flow rate is reduced to a certain amount, a self-sustained instability occurs in the flow. In this case, instability appears in the form of shock waves system oscillation which is called Buzz phenomenon. An axisymmetric supersonic air intake with mixed compression which is designed for a Mach number of 2 has been investigated experimentally in order to study buzz frequency. The intake has been experimented in different Mach numbers, angles of attack and mass flow rates. Besides, the intake with wind tunnel wall has been modeled and analyzed in...
Investigation of the Effect of Shape, Frequency and Amplitude on Fin Oscillating Motion Inspired by Fish Tail Shape
, M.Sc. Thesis Sharif University of Technology ; Vossoughi, Gholamreza (Supervisor) ; Seif, Mohammad Saeed (Co-Supervisor)
Abstract
Inspired by the behavior of creatures in nature, including fish, generating propulsive forces under water has attracted great interest in recent years. Various tools such as computer software and experimental laboratory observations can be used to study the movements for different types of fishes. In this research, two thin fins, the shape of which is inspired by fish tail, will be investigated as a simplified model under non-viscous and incompressible fluid conditions using the experimental results and Ansys CFX software. For this purpose, the fin is considered once as a unforked rigid cantilever and again as a rigid forked cantilever with a constant water inlet speed of 10 cm per second....