摘要
以NACA0015水翼为研究对象,采用Schnerr-Sauer空化模型和Ffowcs-Wiliams&Hawkings声学模型,计算了二维水翼的空化噪声,并对水翼的空化过程和水翼空化的噪声性能进行了分析。研究结果表明,水翼空化呈现出明显的脉动性和周期性,空化空泡云脱落的周期为0.170 4s,由漩涡引起的水翼壁面附近的反向射流是诱发空化空泡形成和脱落的主要成因。通过分析各个监测点的声压脉动特性可知,噪声在水翼头部区域的传播与主流方向一致,没有逆向传播。在空化发展过程中,空化区域的噪声信号有向下游叠加的趋势,但是传播到水翼尾部流动区域时,已经逐渐衰减完毕。
With NACA0015 hydrofoil as the research objective,Schnerr-Sauer hydrofoil model and Ffowes-Wiliams Hawkings acoustic models are adopted to calculate the two-dimensional hydrofoil cavitation noises and to analyze the performances of hydrofoil cavitation process and hydrofoil cavitation noises.The research results indicate that hydrofoil cavitation process appears to have obvious pulsation and periodicity,and that the period of cavitation cloud falling off is 0.1704 s.The reverse jet induced by the vortex near the wall of hydrofoil is the major cause of cavitation inception and falling off.The transmission direction of noise in the head of hydrofoil is the same with the main flow direction,and backward transmission does not happen.In the process of cavitation development,the noise signal of cavitation region has the tendency of adding to downstream,but when the noise signal spreads to the hydrofoil tail for region,it has gradually attenuated.
出处
《西安理工大学学报》
CAS
北大核心
2015年第1期67-71,共5页
Journal of Xi'an University of Technology
基金
国家自然科学基金资助项目(51179152)
关键词
水翼
空化
噪声
数值模拟
hydrofoil
cavitation
noise
numerical simulation
