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.