Abstract
To clarify the cutting mechanism of water jet, it is very important to know dynamic properties of stagnation pressure of water jet. This pressure includes wide range frequency components, such as pulsation of a plunger pump and impact pressure caused by impingement of droplets, and so on. In this case the transducers' characteristics affect the source wave, and the detected wave of pressure differs from source wave. The system and method to obtain the source wave of stagnation pressure from detected wave are presented in this paper. Their characteristics are in using a digital filter for deconvolution. And the accuracy of the present method is examined by comparing its result with that of other method. In addition, relationship between characteristics of the stagnation pressure and the flow structure of water jet is examined by flash photography using pulsed laser light. As a result, it is elucidated that the fluctuation of stagnation pressure is caused by wavy motion of water jet
