高压清洗机清洗钢板的射流靶距与水射流打击力有关，在不同压力和流量情况下，都存在一个最佳靶距范围，而在这个靶距范围内，就可以获得最大水射流打击力。以下分析了当射流靶距分别为120mm、150mm、200mm、300mm时，水射流覆盖面积和水射流打击力变化，具体示意图和数据如下：

水射流覆盖面积

射流靶距/mm 覆盖面积/mm2 面积变化比 水射流打击力变化比

120 A1    436 0.69 1.45

150 A2    632 1 1

200 A3    1124 1.78 0.56

300 A4    2525 4 0.25

当喷嘴确定后，射流靶距是影响射流覆盖面积变化的唯一变量，试验结果显示，如果射流靶距增加一倍，则射流覆盖面积将增加4倍，但水射流打击力仅为原来的1/4；如果把射流靶距减小一半，则射流覆盖面积仅为原来的1/4，但水射流打击力为原来的4倍，所以射流靶距的合理确定也十分重要。在设计射流靶距时，既要考虑射流靶距减小带来的水射流打击力的增大，又要考虑射流靶距减小使得单个喷嘴覆盖的面积减小，以此带来的覆盖同样宽度需要喷嘴个数的增加。(图/文www.wxcwjx.com)

中译英：

Jet target high pressure cleaning machine plate distance associated with the water jet impact force, under different pressure and flow conditions, there exists an optimal target distance, and in the target range, it will be the largest water jet impact force. The following analysis of the jet distance were 120mm, 150mm, 200mm, 300mm, water jet cover area and water jet impact force changes, the schematic diagram and the data are as follows:

Water jet coverage area

The jet distance /mm covering /mm 2 area change area than the water jet impact force change ratio

120 A1 4360.69 1.45

150 A2 63211

200 A3 11241.78 0.56

300 A4 252540.25

When the nozzle is determined, the jet distance is only covered area change jet variables, test results show that, if the jet distance doubled, then jet coverage area will increase 4 times, but the water jet impact force is only the original 1/4; if the jet distance is reduced by half, then jet coverage area is only the original 1/4, but the water jet impact force is 4 times of the original, so the jet target distance is also very important to reasonably determine. In the design of the jet distance, jet to target spacing increases, it is necessary to consider the decrease of water jet impact force, but also consider the jet distance decreases makes a single nozzle coverage area is reduced, increasing the coverage width need to bring the same number of nozzles.