摘要
对于空气质量传感器中的热电阻表面流场分布,需要设计一种合适的内部小流道,能使得热电阻表面的流场分布合理。选择流场湍流模型,仿真分析了直线形壁面和几种圆弧形壁面的内部小流道的流场分布,研究了它们的流场分布特性,确定了热电阻的安装位置。仿真结果表明:与直线形流道相比,圆弧形流道具有较好的同一水平方向的速度一致性和较小的垂直方向速度梯度,圆弧半径为20mm的流道,其热电阻安装位置处的流场平均速度与进气管入口风速之间有很好的线性关系,适合作为传感器的内部小流道。
Regarding the thermal resistance surface's flow field distribution of the air mass flow sensor,a kind of appropriate internal small flow channel needs to be designed,through which the thermal resistance surface's flow field distribution can be reasonable.Through selecting flow field turbulent model,internal small flow channel's flow field distribution of linear wall and several kinds of circular arc wall are simulated,and their flow field distribution characteristic is analyzed.The thermal resistance's installation position is determined.The results show that compared with the linear flow channel,the round arc flow channel has better speed consistency in identical horizontal direction and small speed gradient in vertical direction.For the flow channel with 20 mm radius circular arc,there is good linear relationship between its flow field's average speed at the thermal resistance's installation position and the flow speed at the entrance of air inlet pipe.It is appropriate to be used as sensor's internal small flow channel.
出处
《传感器与微系统》
CSCD
北大核心
2011年第3期94-97,共4页
Transducer and Microsystem Technologies
基金
上海市科委火炬计划资助项目(08DZ1120702)