359 / 2019-10-25 11:35:08

Field Measurement and Numerical Study of External Average Wind Pressure of Ribbed Cooling Tower

The hyperbolic thin-shell cooling tower is a typical wind-sensitive structure. The full-size measurement is the most direct and important way to study the distribution of wind pressure in the cooling tower. Due to the limitations of engineering conditions and meteorological conditions, the field measured data are relatively lacking. And at present, field test data of ribbed cooling tower have not been found. In order to provide a scientific wind load for engineering design, we chose a ribbed cooling tower in Toksun county, Xinjiang, China, which has strong wind all year round, to carry out field measurements to understand the wind load characteristics of the tower under the perennial dominant wind direction and the maximum wind direction. In this paper, the average wind pressure of the cooling tower has been measured. Taking the wind direction of the maximum wind speed as an example, the northwest wind is studied. Preliminary results of full-scale measurement of pressures are given. It was found that the absolute value of the negative pressure on the leeward side was larger than the norm when the field measured wind speed was greater than 10m/s. And the influence of Reynolds number on wind pressure is very great for a circular section cooling tower. With the increase of Reynolds number, the absolute value of the average negative pressure of the tail wind pressure coefficient increases, which should be paid attention to in design. The regression curves of the average wind pressure coefficients measured on site under several typical working conditions are given by using the least square method, and its form is consistent with the standard (but the coefficients are different), and the absolute value of the negative pressure of the return curve on the leeward side is larger than that in the code. In addition, Fluent software was used to calculate the external wind pressure of the cooling tower, and the field measured results were compared with the Chinese code, German code and numerical calculation, and the results were consistent.