CAJ | 학술논문

以NACA0015水翼为研究对象，采用Schnerr‐Sauer空化模型和Ffowcs‐Wiliams & Hawk‐ing s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0．1704s，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。
이NACA0015수익위연구대상，채용Schnerr‐Sauer공화모형화Ffowcs‐Wiliams & Hawk‐ing s성학모형，계산료이유수익적공화조성，병대수익적공화과정화수익공화적조성성능진행료분석。연구결과표명，수익공화정현출명현적맥동성화주기성，공화공포운탈락적주기위0．1704s，유선와인기적수익벽면부근적반향사류시유발공화공포형성화탈락적주요성인。통과분석각개감측점적성압맥동특성가지，조성재수익두부구역적전파여주류방향일치，몰유역향전파。재공화발전과정중，공화구역적조성신호유향하유첩가적추세，단시전파도수익미부류동구역시，이경축점쇠감완필。
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 hy‐drofoil cavitation noises .T he 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 .170 4 s .The reverse jet induced by the vortex near the wall of hydrofoil is the major cause of cavitati‐on inception and falling off .T he 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 dow n‐stream ,but w hen the noise signal spreads to the hydrofoil tail for region ,it has gradually attenu‐ated .