PEMFC内薄膜温度传感器动态特性的数值模拟

Numerical Simulation of Dynamic Properties of Thin-Film Temperature Sensor Inside PEMFC

摘要:

通过数值模拟和系统辨识建模，研究了质子交换膜燃料电池（PEMFC）薄膜温度传感器的动态特性，并根据传感器在PEMFC中的位置，建立了传感器的一维瞬态传热模型。采用COMSOL软件的仿真和系统辨识方法，得到了系统动态数学模型、动态性能指标和动态误差。对于绝缘层厚度为1、2、3、5、10 μm的薄膜温度传感器，确定了其工作频带、延迟时间、上升时间及动态误差峰值等指标参数，并且通过实验手段制作和校准了一个薄膜温度传感器。结果表明，随着绝缘层厚度的增加，传感器的动态性能降低。提出通过模型仿真来判断PEMFC内温度传感器能否满足动态测温要求，这将有助于PEMFC内部瞬态温度的实验研究，也可为传感器的参数选择和结构设计提供参考。

Abstract:

The dynamic properties of thin-film temperature sensors with different sizes are investigated in detail through numerical simulation and system identification modeling. A one-dimensional transient heat transfer model for the sensor is built based on its location in the proton exchange membrane fuel cell （PEMFC）. The dynamic mathematical model， dynamic performance indicators， and dynamic error are obtained by employing COMSOL simulation and the system identification method. Notably， several significant dynamic parameters including working frequency bands， delay time， rise time as well as dynamic error peak， are determined for insulation layers of 1 μm， 2 μm， 3 μm， 5 μm， and 10 μm thick， and a real thin-film sensor is fabricated and calibrated. The results demonstrate that the sensor dynamic performance reduces with the growth of the insulation layer thickness. This paper reports a novel method to identify whether a thermal probe can capture the internal dynamic temperature variety of PEMFC， thus benefiting the further development of thermal probe on the research for PEMFC dynamic temperature variation under transient conditions， which is likely to inspire the sensor design contained physical parameters selection and structural design.