螺旋桨空泡和噪声特性试验研究

本文通过螺旋桨空泡噪声模型试验,研究螺旋桨空泡和噪声特征,以及螺旋桨不同阶段空泡和噪声的关系,探究螺旋桨噪声产生及控制机理.建立了螺旋桨空泡和噪声同步测试方法,针对2400 TEU集装箱船螺旋桨开展模型试验.从螺旋桨模型试验结果分析得出:片空泡脱落形成梢涡空泡产生的噪声量级最高,且具有宽带特性,梢涡空泡噪声量级次之;模型状态下片空泡脱落形成梢涡空泡,以及独立的梢涡空泡引起的空泡噪声均在1000 Hz附近存在明显峰值,对应实桨的峰值频率为50-60 Hz.

Experimental Study on Characteristics of Marine Propeller Cavitation and Noise

In order to study the relativity of propeller cavitation pattern and propeller radiated noise, a synchronous measurement technology was developed to measure the radiated sound and cavitation pat-tern simultaneously. Based on the model test results, the characteristics of marine propeller cavitation and noise were analyzed. Model test of a 2400 TEU container was carried out in the large cavitation channel of CSSRC. From the results of the propeller model test, the sheet and tip vortex cavitation has the highest noise level with a broadband feature. The tip vortex cavitation has a much weaker noise lev-el than the sheet and tip vortex cavitation, but is higher than that of non-cavitation state. Noise spectra of the sheet and tip vortex cavitation and tip vortex cavitation both show a'hump'around 1 kHz in model scale, corresponding to about 50-60 Hz in full scale.