Abstract
The characteristics and working principles of the impinging by submerged water jet are analyzed, and the relevant mathematical model is optimized based on Rajaratnam’s theoretical and experimental study. A new mathematical model is constructed by adding an important parameter called impinging angle. A new experiment is designed according to the working conditions of various impinging distances and angles. In combination with the experiment data and with the use of the curve fitting method, the functional relationship between the impinging distance and angle as well as the coefficient C4is obtained. The experiment results show that the scour depth decreases as impinging distance increases, followed by a trend from decline to rise before falling again; those two turning points occur within the range of 20d–25d. The scour depth constantly increases with rising impinging angle, and the maximum and minimum increasing ranges can reach 180% and 50%, respectively, with the impinging angle increasing from 40° to 90°.
Highlights
Sedimentation is a considerable problem in rescue and salvage engineering, especially in deep sea
Most studies currently deal with sediment erosion empirically, and many more attempts are made to understand the erosion process because of submerged water jet
In 1940, Rouse[3] proposed the method of simulating the process of natural erosion of sediment using water jets. He studied the effect of impinging by water jet and noted that the impinging velocity in a large experimental device is the main factor influencing the effect of scour; whereas in a small experimental device, the Transport Equipment and Ocean Engineering Department, Dalian Maritime University, Dalian, China
Summary
Sedimentation is a considerable problem in rescue and salvage engineering, especially in deep sea. Keywords Submerged water jet, sediment removal, scour depth, impinging angle, impinging distance, mathematical model
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