风流对催化传感器动态响应的影响

Influence of Air Flow on Dynamic Response of Catalytic Sensor

动态响应速度是催化传感器的一个重要性能指标。文章基于Fick扩散定理建立了在风流中瓦斯向催化传感器扩散速度的数学模型,并通过实验研究了风流对催化传感器动态特性的影响。研究结果表明,催化传感器的风流速度以及进气口与风流方向之间的夹角是影响催化传感器动态响应的重要因素,影响规律为随着催化传感器的进气口与风流方向之间夹角角度的增加,催化传感器的响应时间增加,响应速度减慢,响应输出值降低;随着风流速度的增加,催化传感器的响应时间减小,响应速度加快,响应输出值增加。

Dynamic response speed is one of the most important performance indexes of catalytic sensor. Based on Fick＇s diffusion theorem, the paper built a mathematical model of gas diffusion velocity for catalytic sensor in air flow, and studied influence of air flow on dynamic response of catalytic sensor through experiment. The study result indicated that speed of air flow and angle between air inlet of catalytic sensor and direction of air flow are two critical factors for dynamic response of catalytic sensor. The influence rule is the response time of catalytic sensor will increase, and the response speed and output value of catalytic sensor will decrease with an increase of angle between air inlet of catalytic sensor and direction of air flow, and the response time of catalytic sensor will decrease, and the response speed and output value of catalytic sensor will increase by increasing speed of air flow.