Abstract
Combined numerical simulation with experiment, blade wrap angle, and blade exit angle are varied to investigate the optimized design of the impeller of centrifugal pump. Blade wrap angles are 122°, 126°, and 130°. Blade exit angles are 24°, 26°, and 28°. Based on numerical simulation, internal flow of the centrifugal pump with five different impellers under 0.6, 0.8, 1.0, 1.2, and 1.5 Qd are simulated. Variations of static pressure, relative velocity, streamline, and turbulent kinetic energy are analyzed. The impeller with blade wrap angle 126° and blade exit angle 24° are optimal. Distribution of static pressure is the most uniform and relative velocity sudden changes do not exist. Streamlines are the smoothest. Distribution scope of turbulent kinetic energy is the smallest. Based on performance experiments, head and efficiency of the centrifugal pump with the best impeller are tested. The values of head and efficiency are higher than that of the original pump. Centrifugal pump with the best impeller has better hydraulic performance than the original centrifugal pump.
Highlights
A centrifugal pump is one kind of general machinery [1] which is widely and fully utilized in the industrial and agricultural fields [2], such as irrigation and water supply
The impeller is the core part and it converts the mechanical energy into pressure energy [3], which directly determines the transport capacity and the hydraulic performances of centrifugal pump
Optimized design of hydraulic machinery in engineering fields, which is based on two-dimensional flow theory, is rare
Summary
A centrifugal pump is one kind of general machinery [1] which is widely and fully utilized in the industrial and agricultural fields [2], such as irrigation and water supply. Optimized design of hydraulic machinery in engineering fields, which is based on two-dimensional flow theory, is rare. Coming from home and abroad factories widely employ one-dimensional flow optimally one-dimensional flow theory, which is based on Euler equations, is convenient andtheory simple.toFlow in the design an impeller forsymmetrical. Meridional surface is coming from home and abroad factories widely employ Blade exit angle andtoblade wrapdesign angle (β are two for significant parameters in the impeller one-dimensional flow(Ф). Blade exit angle (Φ) andaccording blade wrap (β2 ) are two significant parameters thehydraulic impeller performance of a centrifugal pump isto mainly determinedflow by these. If speed the blade wrap angle ispump too large, the impeller friction area exit angle mainly depend the specific of the centrifugal and the actual optimized design becomes large, which bad for theisimprovement efficiency.
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