摘要
本文对Contraction-Divergence(收缩-扩张)流道产生的空化泡进行高速摄影观测和空化噪声测量.观测结果中发现随流速增加,气泡状态从离散的空化云变为连续的空化云;噪声谱逐渐从带有宽峰的谱变为连续谱.噪声谱中宽峰的中心频率和峰值都随流速变化而变化.在频率范围[0-50kHz]内对功率谱进行积分,积分值随流速增加迅速增加,可以表示空化的强度变化.实验证明,与声空化存在瞬态和稳态两种空化类似,也存在两种流体动力式空化.
In the present work, the cavitation bubble cloud and cavitation noise in the contraction-divergence channel have been investigated. With increasing the liquid speed, the bubbles state changes from discrete cavitation cloud to continuous cavitation cloud and the cavitation noise spectrum with broad peak changed to continuous spectrum. The central frequency and value of the peak in the noise spectrum changed with the liquid speed increasing. The integral of the cavitation noise spectrum in [0-50 kHz] shows that the integral valve increased sharply with the liquid speed increasing, and it can indicate the cavitation intensity. There are two kinds of cavitation situation, just like the acoustic cavitation which includes transient cavitation and stable cavitation.
出处
《中国科学：物理学、力学、天文学》
CSCD
北大核心
2012年第10期987-995,共9页
Scientia Sinica Physica,Mechanica & Astronomica
基金
国家自然科学基金(批准号:10804118)
国家科技重大专项基金(编号:2011ZX05032-003)资助项目
关键词
流体动力式空化
空化噪声
空化强度
hydrodynamic cavitation, cavitation noise, cavitation intensity
