超高压水射流形成过程中的压力损失研究

Research on the Pressure Loss in the Generating Process of Hyperpressure Waterjet

对超高压水射流形成过程中的压力损失进行了理论研究,并且对不同条件下超高压水射流速度的变化规律进行了实验研究,最后确定了不同条件下超高压水射流的初始参数。结果显示,在超高压水射流形成过程中,压力损失主要是在水流从高压管道进入高压喷嘴时由于流道发生断面收缩而造成的,压力损失大约为最终超高压水射流动能密度的49%;随着喷嘴口径的增大,压力损失减小,整个系统的能量利用率越高;随着水射流压力的增大,压力损失增大,但增大的程度会减小。

The pressure loss in the generating process of hyperpressure waterjet is theoretically studied in this paper.The velocities of waterjets have been measured under different conditions.On the basis of theoretical results and the experimental data,the initial parameters of the hyperpressure waterjet have been obtained.The results show that the pressure loss in the generating process is mainly resulted from the section shrinkage.The lost pressure is about 49 percent of the final kinetic energy of hyperpressure waterjet.As the nozzle diameter increases,the pressure loss decreases and the output power of the waterjet generating system is enhanced.As waterjet pressure increases,the pressure loss increases,but the increased degree decreases.