Sensing Characteristics and Flow Instability of Annular Jet Proximity Sensor

概要

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In this paper, the flow and the sensing characteristics of the annular jet proximity sensor are discussed theoretically and experimentally. First, the annular jet with and without a flapper facing the sensor nozzle is analysed by applying the theory of the reattachment jet flow model and the theoretical sensing characteristic of the sensor is derived and compared with the experimental one. Second, it has been experimentally indicated that the proximity sensor exhibits an instability of flow in a certain range of the distances between the sensor nozzle and the flapper. In order to qualitatively explain the cause of this instability, a simplified two-dimensional potential flow model for the annular jet is presented and analysed. From the result, it has been concluded that the instability of the flow is caused by a vortex in the recirculating flow region.
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