Abstract:A new type fluidic oscillator without feedback channel used as the flowrate sensor in microscale pipes is designed. The simulation study on some measurement characteristics of this flow sensor are conducted under the software FLUENT. The inner flow state and oscillating procedure in chamber is analyzed qualitatively through the investigation of flow fields. The oscillation frequency is obtained under different inlet velocities by the analysis of the velocity fluctuation in the preset points and then the functional relationship is established between the flow velocity and oscillation frequency. Simulation results show that the microscale fluidic flow sensor oscillates stably and the main jet switches side by side flexibly. The linear relationship between velocities and oscillation frequency can be obtained in relatively wide measurement range, and the sensor has the small lower measuring limitation and is easy to be fabricated.