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Fluid Dynamics Analysis of Hot Film Sensor in a Sampling Micro Flow Channel

Thermal film air flow sensor has the characteristics of high precision and fast response. The intake-air velocity in the engine inlet manifold is over the measurement range of the sensor, it is necessary to design special sampling flow channel which can reduce the flow velocity and achieve a stable flow state. The micro flow channel flow field was simulated with CFD meathod, the results show that a well-designed sampling port can obtain stable flow field and effectively low the speed, which can improve the velocity uniformity for measurement in the sensor location. The sampling channel conduces to obtain higher measurement accuracy.