兆瓦级风电机组机舱内部气流组织的数值模拟

Numerical Simulation of Air Regulation Inside the Nacelle of the Mega-Watt Wind Turbine

针对兆瓦级风电机组机舱的通风散热问题,提出了下送上排、下送下排、侧送上排以及侧送下排四种不同的气流组织形式,利用CFD软件对这四种气流组织形式下机舱内的温度场进行了数值模拟,并将模拟结果进行了对比。数值模拟过程假设机舱罩为绝热边界,并利用第二类热边界条件来描述机舱内热源。此外还借助realizable k-ε湍流模型并采用SIMPLE算法。模拟结果表明:相对下送式的两种气流组织形式,侧送式有着更合理的温度分布。尤其是侧送上排式,在三个特定切面上的温度分布均优于其它三种气流组织形式。

Four kinds of air regulation methods were introduced, which were bottom to top method, bottom to bottom method, side to top method and side to bottom method, to solve the ventilation and heat dissipation problem. Numerical simulation was conducted to obtain the temperature filed of each method, and the results of the simulation were analyzed and compared. During the simulation, the nacelle was thought to be an adiabatic boundary and the second thermal boundary condition was introduced to model the heat source inside the nacelle. Finally the realizable k-e model and SIMPLE algorithm were employed. The results of the numerical simulation showed that the side-in methods exhibited better performance compared to the bottom-in methods, especially the side to top method whose temperature field in the 3 chips was proven to be much better.