【摘要】 电气设备往往需要进行多工况的性能实验,这就需要环境室提供相应的温、湿度、压力等参数变化的实验条件,环境室内流场、温度场、湿度场的均匀性往往会影响实验效果.利用CFD技术对某一电气设备实验用环境室内部流场、温度场、湿度场进行了数值计算和模拟.主要讨论了送风温度、喷入液滴粒径对环境室内湿度场的影响.计算结果表明:送风温度越低、喷入液滴粒径越小,湿度场的均匀性越好;送风速度越大,湿度场则能更快达到稳态.最终给出了在所述计算条件下的送风速度和液滴喷入粒径的优化建议,为环境实验室内的气流组织布置和参数设计提供了一定的理论基础.更多还原

【Abstract】 Electric equipments are often tested under different conditions.It is necessary to offer such important alterable parameters by environmental chamber,as temperature,humidity and pressure,and the uniformity of three parameters often influences the test results.To reveal the effect of the diameter of water droplet,inlet temperature and velocity in environmental chamber,a numerical calculation were conducted to investigate the flow and humidity field with FLUENT.The calculation results indicate that the uniformity of humidity meliorates with decreasing inlet temperature and droplet diameter.The stabilizing time of humidity field in chamber is dependent on the inlet velocity.The humidity field becomes steady more easily with the increasing inlet velocity.The optimal velocity and droplet diameter were acquired by calculation under certain conditions.It is also helpful for the design of the airflow organization and parameters in the environmental chamber.更多还原