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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 53549 (08)
- University: Sharif University of Technology
- Department: Mechanical Engineering
- Advisor(s): Abbaspour, Madjid; Behzad, Mehdi
- Abstract:
- The inlet duct is one of the most important components of the waterjet propulsion system, whose hydrodynamic performance is directly related to the capabilities and efficiency of the waterjet propulsion system. In this study, a procedure was proposed to improve the hydrodynamic performance of an inlet duct. According to this proposed procedure, first the basic intake duct geometry of the waterjet propulsion system was prepared using visual programming to simplify the repetition of the design in Rhino design software, and then the numerical analysis of the designed geometry in Star CCM+ commercial software was performed. The simulation results were validated with the results of an experimental study. Also, the simulation results for 6 different inlet velocity ratios (from maneuvering conditions at the port to cruising speed) were presented and discussed. Then, the optimization for a widely used operating condition, ie moving at cruising speed on the intake cross-sectional variables of the suction inlet was performed by using the Non-dominated Sorting Genetic Algorithm II, with two objectives, increasing the axial velocity uniformity and increasing the minimum pressure coefficient, in the intake outlet section. Flow uniformity increased by 4.1% and minimum pressure coefficient by 6.7%. The results showed that this proposed procedure can be used in optimizing each of the inlet duct design variables for vessels with different body lines
- Keywords:
- Waterjet Propulsion ; Computational Fluid Dynamics (CFD) ; Optimization ; Inlet Bleed Duct ; Non-Dominate Sorting Genetic Algorithm (NSGAII) Method ; Intake System ; Flow Uniformity
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