不同围压下自激吸气脉冲射流喷嘴吸气性能的试验研究

Experimenal Research on the Inspiration Performances of Pulsed Jet Nozzle with Self-excited Inspiration under Different Confining Pressure

深水条件冲沙时,改善自激脉冲射流喷嘴的吸气性能,可以提高射流的打击力和泥沙颗粒的悬浮高度,及延长泥沙颗粒的输移长度.因此,研究自激脉冲射流喷嘴的吸气性能有重要意义.利用自行研制的试验系统对自激吸气脉冲射流喷嘴的吸气性能进行了试验研究,运用无量纲分析法,对一定入口条件下各结构参数和运行参数配比对无量纲吸气量的影响进行分析,得出了深水条件下无量纲吸气量随自激脉冲射流喷嘴各无量纲参数的变化规律,确定了产生高效能脉冲射流相对吸气量的无量纲参数的范围,为脉冲射流喷嘴的结构设计优化提供理论依据.

Under the conditions of deepwater sediment flushing, the inspiration performances of self-excited pulsed jet nozzle are improved, and these parameters are increased, such as the hitting force of jet flow and the suspension height of sediment particles, and the transport length of sediment particles is increased. Therefore, it is important and significance to research the inspiration performances of self-excited pulsed jet nozzle. In order to research the effect on the inspiration performances of self-exclted pulsed jet device under deepwater condition, we had a lot of testing about the self-excited inspiration of pulsed jet device with self-developed test equip- ments. Using the dimensionless analysis method, we analyzed and researched on the influence of the ratio of structure parameters to the operation parameters on dimensionless inspiratory capacity under certain entry conditions. These are concluded that the change rule of dimensionless inspiratory capacity under deepwater conditions is obtained with the dimensionless parameters of self-excited pulsed jet device, the ranges about the dimensionless parameters of relative inspiratory capacity with highly efficient pulsed jet are identified. These conclusions provide some theoretical basis for the optimization of the structure design of pulsed jet device.