Abstract
The purpose of this paper is to contribute to the understanding of unsteady flow of branch pipes in pneumatic systems. Branch pipes are used in pneumatic pipe systems in various industrial fields. To predict the unsteady pressure changes in the pneumatic piping systems, it is necessary that the dynamic characteristics of branch pipes are at hand, in addition to the dynamic characteristic of single pipe. However, while so many studies are accumulated for a single pipe dynamics, few studies have reported the pressure changes in branch pipes due to oscillatory flow. This paper reports an experimental study on the dynamic characteristics of the pressure change in a pneumatic branch pipe under given oscillatory flow. The paper also proposes a simulation method to predict the pressure changes in a pneumatic branch pipe under oscillatory flow. The validity of simulation is verified for oscillatory flows up to 5 Hz, comparing with the experimental results.
Highlights
The purpose of this paper is a prediction of unsteady pressure change at the T-joint of a branch pipe, which is induced by oscillatory compressible fluid flow
Relationships between piping configuration and the transient pressure changes are beginning to draw the attention of engineers
This study investigates the pressure change in a tee branch pipe under oscillatory compressible flows
Summary
The purpose of this paper is a prediction of unsteady pressure change at the T-joint of a branch pipe, which is induced by oscillatory compressible fluid flow. The water hammer is a remarkable unsteady phenomenon, which can generate a dangerously high pressure [1]. No comparable high pressure is generated; the unsteady phenomena in gas and pneumatic piping had drawn relatively little attention of engineers. The pneumatic power systems include actuators such as cylinders, air motors, and air springs. In the control of the pneumatic power systems, transient pressure has influence on the motion of the pneumatic actuators. Relationships between piping configuration and the transient pressure changes are beginning to draw the attention of engineers
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