|
Paddle wheel efficiency can directly reflect the energy utilization rate of the paddle wheel, is an important index to measure the rationality of the paddle wheel structure. The immersed depth ratio of paddle wheel affects the amount of water stirred by paddle plates, the number of paddle plates affects the speed of water stirred by paddle plates, and the tilt Angle of paddle plates affects the synthetic speed Vi of paddle plates when the paddle plates exit and enter the water. They jointly affect the thrust and torque of paddle wheel, and then affect the efficiency of paddle wheel. In this paper, a Computational model is established by means of Computational Fluid Dynamics (CFD) technology to study the influences of paddle wheel immersed depth ratio, number of Paddle plates and tilt Angle on the efficiency of paddle wheel, which further guides the optimization design of the main structural parameters of paddle wheel. The simulation model was used to carry out tests, and the immersed depth ratio (0.15-0.27), the Paddle tilt Angle (0-12°) and the number of Paddle plates (7-11) were taken as test factors to carry out orthogonal tests with three factors and five levels, and the efficiency of paddle wheel with different structural parameters was obtained. The results show that the tilt Angle of the Paddle plate has the most significant effect on the paddle wheel efficiency, followed by the immersed depth ratio, the number of Paddle plate has the least effect, and the interaction between the factors is not obvious. When the tilt Angle of Paddle plate is 12°, the immersed depth ratio is 0.21 and the number of Paddle plate is 8, the paddle wheel propulsion efficiency is the highest 36.1%. After structural parameter optimization, the propeller efficiency increases by 17.85%, reflecting the importance of paddle wheel structure optimization.
|
