基于CFD的空间场温度系统建模与控制

针对流体分布参数控制系统难以进行建模和控制的问题,提出一种基于计算流体动力学（CFD）的仿真与控制新方法.该方法利用CFD对被控对象进行数值模拟,为系统辨识和控制提供全场时空信息；将参数估计和控制算法嵌入CFD数值计算中,分别实现基于CFD的系统建模和闭环控制.以环境模拟实验室空间场温度控制为例,以Fluent作为CFD仿真平台,利用用户自定义函数（UDF）实现带遗忘因子的递推最小二乘算法和PI控制算法,进行该方法有效性验证.结果显示,该方法能够获得分布参数系统模型,可实现对系统的有效控制.

Modelling and control of CFD-based distributed parameter system

A new approach is proposed to resolve the problems of difficult modelling and control in fluid distributed parameter system.Parameter control system for fluid distribution is difficult to model and control the problem and introduce a new method-based on accurate CFD simulation and control.The plants controlled were simulated by CFD which could provide detail information of a full space field for system identification and control.To achieve on-line modeling and close-loop control,parameter estimation and control algorithms could be incorporated into CFD model.To examine the performance of the new method,an example about internal temperature field nonlinear control of the lab of environment simulation was explored.Commercial CFD software Fluent was used as CFD simulation platform.Through its User-Defined Functions(UDF) recursive least squares algorithm with forgetting factor and PI control algorithms were implemented.The results show that this method could be used to modelling distributed parameter system and to achieve effective control of the system.