Affiliation:
1. Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan, China
2. School of Power and Mechanical Engineering, Wuhan University, Wuhan, China
3. School of Energy and Power Engineering, Wuhan University of Technology, Wuhan, China
Abstract
Self-resonating waterjet is a kind of high-efficient jet being employed in a number of applications. This study aims to enhance the working performance of self-resonating waterjet by providing organ-pipe nozzles with the optimal exit aspect ratio R o. The characteristics of the axial pressure oscillation of the jets were analyzed with the use of six different R o, which were R o = 2, 2.5, 3, 4, 5, and 6, respectively. The pressure oscillation peak ( Pmax) and amplitude ( P a) were used to evaluate the effects under two inlet pressures of 10 MPa and 20 MPa. Results show that R o has significant influence on the magnitudes of the pressure oscillations and is able to eliminate the self-resonating pulsations. It was found that both Pmax and P a as a function of the standoff distance shows some differences for different R o, while the inlet pressure is almost independent of the trends of Pmax and P a against the standoff distance for all the six R o. Under the experimental conditions, R o = 5 should be the optimal ratio for creating the largest Pmax and P a. While at inlet pressure of 20 MPa, R o = 4 turns to be a preferred value for generating greater values of the P a. It was also found that the relations of the averaged dimensionless Pmax and P a against the dimensionless standoff distance are linear and cubic, respectively. In addition, the dimensionless Pmax against R o is hardly affected by the inlet pressure and standoff distance, while the dimensionless P a as a function of R o is influenced by the standoff distance more than by the inlet pressure.
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6 articles.
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