通气量对轴向加速过程超空泡发展规律影响的试验研究

Experiment research about the effects on supercavitation evolution of restrained model during axial accelerating

文中研究了锥柱组合体模型在轴向约束加速运动中人工通气量对加速过程中超空泡形态的影响及其变化规律。研究表明模型在加速过程中不通气的情况下,只有锥柱结合面后尚有局部空泡,但未见超空泡形成。在通气量23.4g/s、19.0g/s、14.6g/s、9.3g/s下,均能在研究的σv范围内逐步形成超空泡。对于一定的通气量,随着模型运动速度的逐步提高,自然空化数逐步减小,空泡由短变长;由大片分段脱落不连续的空泡变成连续的空泡;由空泡长度明显的不稳定到稳定;由空泡表面不光滑到光滑;发展成空泡表面光滑透明的超空泡。超空泡随通气量的变化规律与水洞定常试验结果是一致的。

The effects of ventilation on supercavitation evolution were studied experimentally during accelerating.No supercavitation was observed even while nature cavity number reaches 0.03 except local cavities after cavitator and on cone-cylinder conjoined part if without ventilation or with small ventilation.For larger ventilations 23.4, 19.0, 14.6, 9.3g/s, supercavity is forming after cavitator of prototyper as nature cavity number becoming smaller. All the supercavitations experience same process： length from short and unstable to long and stable, shape form portioning to continuous, free surface of cavity from rough to smooth, appearance from dull to transparent.The trends of supercavitation evolution with ventilation as similar as steady results in water tunnels.