Study on velocity and pressure characteristics of self-excited oscillating nozzle
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(2021) 43:5
TECHNICAL PAPER
Study on velocity and pressure characteristics of self‑excited oscillating nozzle Xiaojun Zhang1 · Xiaqing Li1 · Songlin Nie1 · Liping Wang2 · Jianghui Dong2 Received: 19 October 2019 / Accepted: 9 November 2020 © The Brazilian Society of Mechanical Sciences and Engineering 2020
Abstract The mechanism of the self-excited oscillation pulsed jet is still in a period of continuous improvement, and the application breadth and depth of the self-excited oscillation nozzle are significantly limited since the turbulent flow field inside the self-excited oscillation nozzle is exceptionally complex. In this study, computational fluid dynamics numerical simulation and experimental research methods are combined. By changing the structural parameters of self-excited oscillating nozzles, the velocity and pressure characteristics of the self-excited oscillating nozzles were compared and analyzed to determine the important factors that influenced the effect of pulsed jet. These findings demonstrated that the periodic expansion and contraction of the low-pressure vortex ring in the self-excited oscillation nozzle chamber will cause the pressure of the nozzle outlet section to change periodically. The periodic high-voltage blocking and low-pressure speedup of the outlet directly correlate with the pulsed jet. This study shows the reasonable size design range of the self-excited oscillation nozzle, which can guide the design and practical application of the nozzle, as well as provide the theoretical basis for perfecting the selfexcited oscillation pulsed jet theory. Keywords Self-oscillating nozzle · Pulsed jet · Acceleration factor · Computational fluid dynamics (CFD) · Pressure · Velocity
1 Introduction The high-pressure water jet is widely used by many industries [20], such as cutting, fire engineering, drilling and cleaning are just a few [12], with the increasing pressure on working conditions, piping and high-pressure water pumps and other equipment requirements are increasingly harsh, resulting in a sharp increase in production costs [2]. The self-excited oscillation nozzle due to its self-oscillation, which produces pulsed jet characteristic [28], has the Technical Editor: Daniel Onofre de Almeida Cruz. * Liping Wang [email protected] * Jianghui Dong [email protected] 1
Beijing Key Laboratory of Advanced Manufacturing Technology, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China
College of Biotechnology, Guilin Medical University, Guilin, Guangxi 541004, China
2
potential to achieve high operating efficiency under low operating conditions [13]. The academic and market value to carry out research work on self-excited oscillating nozzles is invaluable. The study of the internal flow field characteristics of self-excited oscillating nozzles is usually carried out by experimental research [19] and theoretical research [6]. At present, the research mainly focuses on the study of the pressure characteristics inside the self-excited oscillating
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