风动力屋顶排风机性能分析及实验研究

通过运动学分析和实验测试,对风动力屋顶排风机的能量转换机理和风能利用特性进行了研究.结果表明组成该装置的半月板式叶片在自然风作用下能够产生驱动力矩,带动排风机旋转,防止下切风产生逆压差影响自然排风.同时,当风速增加时,其排风能力有所增强,说明除了密度差导致的排风动力外,其本身也具有一定的排风能力.另外,对于低功率密度风能利用研究,给可再生能源的利用又提供了一个新的发展方向.

Performance Analysis and Experimental Study on a Wind-Driven Fan Installed on Roof

Performance and energy conversion mechanism of a wind-driven fan installed on roof were studied through kinematical analysis and experiment.Most of the meniscus fan blades can generate a driving torque under the action of natural wind to rotate the fan and prevent the downward shearing wind from counter pressure difference which is unfavorable to natural draft,no matter what the incident angle of natural wind is.On the other hand,the fan's draft inducibility is enhanced somewhat with increasing wind speed.It implies that the fan itself has a draft inducibility to a certain extent in addition to that due to power density difference,and the investigation on how to utilize the low power density wind energy will be a new way to develop renewable energy resources.