工业热设备内壁缺陷形态仿真研究

Simulation of Defect Configuration in Heat Equipment’s Inner Wall

工业热设备内壁缺陷的具体形态在安全检测中有着重要的作用,但一般情况下难以直接观察和测量。建立了基于传热反问题机理的工业热设备内壁缺陷形态辨识的数学模型,利用红外温度计获取热设备外壁的温度分布,从目标函数的泛函变分出发,将共轭梯度法引入反问题数值计算中,通过把反问题转换成三个问题的求解:正问题,灵敏度问题及伴随问题,遏止了反问题对测量误差的放大作用,仿真实验验证了该方法的有效性。

The defects configuration in the heat equipment＇ inner wall play an important role in safety inspections, but it is difficult to observing and measuring in general case. A model for configuration simulation of the defects in the heat equipment＇ inner wall was established based on inverse heat transfer problem. Based on the temperature data of the heat equipment＇ outer wall obtained by an infrared scanner or thermometer and the variation of the object function, the conjugate gradient method was introduced into the numerical calculation of the inverse problem, and the inverse problem was transformed to the solution of three problems, namely, the direct problem, the sensitivity problem and the adjoint problem. The magnifying ability for measurement error effect of the inverse problem is held back. The validity of this method is verified in the simulation experiments.