| Summary: | 碩士 === 國立成功大學 === 機械工程學系碩博士班 === 91 === The aiming of this thesis is to approve the reflux action and substitute the cubic spline with rational B-spline for deciding the outward scale of blade, and make the blade can be manufactured by multi-axis milling. The process of this thesis would be written below. Decide the specific speed and NPSHR with the operation condition, which can avoid the generating of cavitation. Choose the flow parameter with the Euler theory combined with the velocity triangle and blade parameter designing method. Rational B-spline would be taken into curve designing for its smoothness, which can improve the smoothness of the flow, and create the blade body by concentrating the flow parameter and the conjunction generating machining method. Design the deflector and its length with the interference of tools to improve the flow characteristics. According to the experiment method, we generate enough samples for the training of Artificial Neural Network by the original blade design and different levels. Three-dimensional stream-way including the clearance would be build with CATIA, and its stream-way would be analyzed with computing flow dynamics software, TASCflow. Search the best parameters with the Pressure rising.
The advantages of this thesis were written below. The blade made by rational B-spline, which has the characteristics such as smoothness, multi-solution, proteiform, and can be normalized to search the tendency of spline is able being applied in multi-axis processor, shorten the manufacturing period, and has the advantage of being parameterized. Build the blade body and the stream-way with the conjunction generating machining method for forward blade appraising and flow analysis. Concerning the clearance make our flow analysis approach the actually impellor working situation combining with the shell which always cover it. Design the deflector in order to avoid of generating reflux. Expected issue is to build a high efficiency centrifugal impellor geometry without generating reflux and cavitation.
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