等离子体流动控制试验与仿真对比研究

Comparative Study of Experiment and Simulation on Plasma Flow Control

采用数值模拟与风洞试验相结合的方法,研究了当来流风速为7 m/s、湍流度小于10%时,在4种不同方向的等离子体射流激励下,低矮房屋平屋面上流动分离的规律.研究结果表明:施加顺风向等离子体激励,能减小屋面的平均风压系数和极值风压系数;施加逆风向等离子体激励,能增大屋面前檐的平均风压系数和极值风压系数,同时减小屋面中部及后檐的平均风压系数和极值风压系数;施加引起由中间射向两边的等离子体激励,能增大屋面前檐的平均风压系数和极值风压系数,能减小屋面后檐的平均风压系数和极值风压系数;施加引起由两边射向中间的等离子体激励,能减小屋面前檐以及屋面后檐的平均风压系数,同时能增大屋面中间的平均风压系数和极值风压系数.

This article studied the rule of flow separation in low-rise building with flat roof through the combination of experimental method and numerical simulation, when the wind speed is 7 m/s and the turbulence is less than 10%. The results indicated that the mean wind pressure coefficient and extreme wind pressure coefficient of the roof decreased when applying along-wind plasma actuation;The mean wind pressure coefficient and extreme wind pressure coefficient increased in the front portion of the roof, and decreased in the back portion of the roof when applying headwind plasma actuation;The mean wind pressure coefficient and extreme wind pressure coefficient increased in the front portion of the roof and decreased in the back portion of the roof when applying the plasma actuation from middle to the both sides;The mean wind pressure coefficient decreased in the front portion of the roof and in the back portion, and the mean wind pressure coefficient and extreme wind pressure coefficient increased in the middle portion of the roof when applying the plasma actuation from the both sides to middle. The results of this paper can provide reference for wind resistance studies of building.