Abstract
The calorimetric flow sensor is easily contaminated by dust and oil vapor particles present in the flow for some harsh scenarios, and its measurement accuracy is thus affected. This paper deals with the impact evaluation of oil deposition on the calorimetric flow sensor's measurement accuracy by simulation and experiment. An oil vapor deposition experiment was proposed to present the process and distribution of oil deposition and quantitatively measure the sensor output variation after contamination. In detail, a 3D simulation model is firstly established to investigate the influences of the parameters such as the thickness, width, and location of the oil film. Accordingly, a manual oil deposition experiment by smearing oil with a fine fiber is implemented to study the effect of the oil film on the measurement and to verify the simulation results. The experiment and simulation results consistently demonstrate that the oil deposited on the heater of the sensor has the most significant influence on the measurement, followed by the oil upstream of the heater. The measurement error exceeds 40% when there is only 7 or 8 μm thick oil film on the heater.
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