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Design and Prototyping a High Speed 60 kW Spindle Incorporated Air Turbine
, M.Sc. Thesis Sharif University of Technology ; Durali, Mohammad (Supervisor)
Abstract
Regarding the price of industrial turbo machines, testing the rotating elements of them is always an important issue. One of the companies of the aviation industry decided to design and fabricate a spin tester device to check the quality of new rotating parts before installing them on gas turbines. A team has worked on this project for more than a one year. The present thesis is on designing the drive system of the spin tester. The drive system was chosen to be an air motor. This thesis concentrates on the design procedure of this air motor. The designed system is capable of providing enough power to accelerate the disks to the test speed in the appropriate time. The disk geometry, test...
Investigation and Validation of Combined Turbine and Nozzle Design Changes on performances
, Ph.D. Dissertation Sharif University of Technology ; Hajilouy Benisi, Ali (Supervisor) ; Pourfarzaneh, Hossein (Co-Advisor)
Abstract
In this thesis, the rear part of a turbo-jet engine consisting of a one stage axial turbine and its exhaust nozzle are optimized numerically and experimentally. The decrease of total pressure loss of the flow in the stator and rotor blade cascades is investigated by change of two-dimensional profiles. The three-dimensional blade shape optimization is employed to study the effects of the axial turbine stator and rotor lean and sweep angles as well as radial distributions of stagger angle on the turbine performance. In adition, the effect of the turbo-jet engine exhaust nozzle on its performance is explored. Geometry candidates for the three-dimensional optimization algorithm of the axial...
Modeling and Optimization of Supersonic Separators
, M.Sc. Thesis Sharif University of Technology ; Farhadi, Fathollah (Supervisor)
Abstract
Supersonic separation is a modern technology which is used in petroleum’s industry. Supersonic flow is obtained by converging-diverging nozzle in which by decreasing pressure and increasing fluid’s velocity, we can reach low temperature which is required for separation. After separation in low temperature, pressure is recovered via normal shockwave or a second nozzle. In the case of using second nozzle, fluid’s velocity is decreased and its pressure is increased. In these separators, we have two important issues: Separation efficiency and Pressure recovery . On the other hand, nozzle’s performance depends on two sets of factors: Factors related to nozzle’s geometry and Factors related to...
Numerical Investigation of Different Ventilation Systems in Coal Mines Effects on the Fire Extinguishing
, M.Sc. Thesis Sharif University of Technology ; Afshin, Hossein (Supervisor) ; Farhanieh, Bijan (Co-Supervisor)
Abstract
In recent years, due to fires in mines around the world, the need to study the dynamic behavior of fire to understand how it spreads and design an appropriate fire extinguishing system to reduce damage to people and underground facilities has been felt. Mine fires are usually caused by external sources such as cable connections, methane gas explosions, or coal self-ignition due to oxygen uptake and rising temperatures.In this research, using Fire Dynamic Simulator (FDS) software, after drawing the geometry of a coal tunnel corridor in progress and creating a fire model through pyrolysis of PVC, fire extinguishing was performed by nozzles. If the nozzle does not succeed in extinguishing the...