脉冲气液射流冲蚀特性的实验分析

从提高射流的冲蚀效果出发，通过在自振荡脉冲水射流喷嘴振荡腔上开孔吸入空气使之形成脉冲气液射流，且以混凝土为冲蚀件，测量其冲蚀体积及深度，并与自振脉冲水射流比较。另外以进气方式为研究对象，分析其对冲蚀效果的影响规律。结果表明，脉冲气液射流冲蚀体积随靶距增加出现一峰值与之对应，且峰值位置较脉冲水射流峰值点左移，其冲蚀深度随靶距增加大致线性降低；若腔长选择合理，脉冲气液射流的冲蚀体积较脉冲水射流大幅上扬，在腔长为3mm时其最大增幅达到91.7%。但两种射流对应的冲蚀深度鲜受腔长的影响，且随靶距变化甚微；进气孔分布方式虽对冲蚀深度无显著影响，但对冲蚀体积的影响较为明显。

Experiments on the erosion characteristic of pulsed air-water jet

Aiming at improving the erosion effect of jet, the pulsed air-water jet (PAWJ) has been formed by entraining and mixing the air in the self-excited oscillation pulsed jet (SEOPJ), the erosion volume and depth of PAWJ can be measured and compared with that of SEOPJ by the use of concrete. In addition, the influence of air injection method on erosion effect is studied experimentally. The results are found as follows: The erosion volume of PAWJ firstly increases with the increase of target distance and then decreases, namely there exist a peak value, and the position of which is smaller than that for SEOPJ. The erosion depths of the two jets have a linear decrease as the increase of target distance. The erosive volume of PAWJ is superior to that of SEOPJ in the case of suitable cavity length, the maximum improvement can be achieved up to 91.7% with cavity length of 3mm. However the erosion depths of two jets have hardly been influenced by the cavity length, and the differences between them are slight with target distance. The results also show that the arrangements of air exit ports have quite an effect on erosion volume, but slight effect on the erosion depth.