气核对空化比尺效应的影响

针对空化试验的比尺效应，主要分析气核对空化比尺效应的影响。分别对气核密度、分布规律及初始半径对空化比尺效应进行分析，得出消除由此产生的空化比尺效应应采取的措施。采用临界压力代替汽化压力定义空化数，建立初始气核大小与液体抗拉强度的关系，力图消除液体抗拉强度对空化比尺效应的影响。总结了现有空化试验资料，指出消除空化比尺效应应注意的一些问题。给实际试验提供参考，并为进一步寻求完整而准确的模拟方法提供理论依据。

Influence of gas nucleus on scale effect of cavitation

For the scale effect of cavitation test,the influence of gas nucleus on scale effect is analyzed in this paper.The effects of density,distribution and initial radius of gas nucleus on scale effect are analyzed respectively and the measures necessary for reduction of resulting scale effect are attained.At the same time,critical pressure is applied to replace the cavitation number defined by vaporization pressure and the relationship between initial dimension of gas nucleus and tensile strength of liquid is established to endeavor for eliminating the effects of tensile strength of liquid on scale effect.In order to eliminate scale effects of cavitation,some problems required to be paid attention to cavitation test are summarized to provide the references for actual test and prepared in further quest of complete and accurate simulation methods.