Characteristics of the turbulent flow field in a wall attachment device. Effect of splitter distance, control flow rate and supply flow rate.

Abstract

The flow field in a wall attachment amplifier was visualized and analyzed numerically, and the flow pattern was made clear in the former studies (1) (2) (3). Also, the field-diving method using the k-εturbulent flow model was developed, and its effectiveness has been confirmed by the experiment of flow visualization and velocity measurement. In this study, the variations of the input and output static characteristics of a wall attachment device were made clear by numerical analysis and experiments changing the splitter distance, supply and control flow rate. In this case, a FLIP-FLOP-type logical device was used as the wall attachment device. The numerical method used was the flow-field diving method using the k-εturbulent model, as in the former reports. The input and output static characteristics were determined from the velocity and pressure distributions obtained by using this numerical analysis method. The experiments were performed by changing the Reynolds number, control flow rate and splitter distance. The results were compared with analytical values with which they were in good agreement. From these results, the effects that the variation of splitter distance, control flow rate and supply flow rate exerted on the characteristics of the device were made clear, and the effectiveness of the flow-field dividing method for the calculation of the characteristics was confirmed.