A Natural Draft Wet Cooling Tower Into The Outlet Aerodynamic Numerical Simulation And Resistance

The cooling process of cooling water is very important in power generation industry. The performance of cooling tower has great effect on economy, stability and security of power plant. Hence, research of cooling mechanism is of great engineering and theoretical significance. There are profound study on the internal heat and mass transfer of cooling tower in unwindy weather at present. However, the effect of crosswind on cooling tower, which is of great importance, is lack of research.Based on the numerical research of cooling tower, and with a hyperbolic natural draft wet cooling tower of counter flow to be a investigated subject, this thesis provides mathematical and physical models for aerodynamic field and heat and mass transfer between air and water inside the cooling tower. The numerical simulation program is applied to simulate the aerodynamic field of air inlet numerically.This paper takes a cooling tower of power plant in Jinan city as an example, and provides detailed numerical simulation to the aerodynamic field of air inlet, which includes unwindy weather and various crosswind velocities. The relationship between air inlet velocity and related parameters (crosswind velocity, height, circumferential angle and radial distance away from the tower axis) are studied on the basis of velocity values of air inlet for various work condition. In addition, the definition of characteristic air velocity is presented and the relationship between meteorological parameter and air inlet flow field at unwindy weather are discussed.The calculation indicates that the axial symmetry is ruined by crosswind and the air velocity of windward is higher than that of leeside. There is piercing wind at the tower bottom and air efflux even exits at leeside at high-speed crosswind weather. Besides, within the ranges of 4m away from ectotheca of air inlet top, the inlet air velocity is nearly invariable along with the height increase, while it decreases along with the increase of radial distance. The decrease rate is flat within the ranges of 2m away from ectotheca of air inlet top. In addition, the inlet air velocity obeys Lorentz distribution along the circumferential angle. The...