为检验Kappel桨的噪声性能,在海军工程大学空泡水洞进行背景噪声测量及2种桨模噪声对比试验。本次试验共设计16组工况,分别测量2种桨在无空泡和有空泡时的噪声。由测量结果分析可知,海军工程大学空泡水洞的声学性能满足试验要求,噪声信...为检验Kappel桨的噪声性能,在海军工程大学空泡水洞进行背景噪声测量及2种桨模噪声对比试验。本次试验共设计16组工况,分别测量2种桨在无空泡和有空泡时的噪声。由测量结果分析可知,海军工程大学空泡水洞的声学性能满足试验要求,噪声信号在1-20 k Hz范围内可获得较高的信噪比。无空泡时,Kappel桨与传统桨的辐射噪声相当;在相同转速空泡数σn下,Kappel桨的空化辐射噪声高于传统螺旋桨的,同时观察其空泡形态,与传统螺旋桨相比Kappel桨的空泡形态要为剧烈,表明在空泡性能方面Kappel桨要低于传统螺旋桨,在Kappel桨的设计过程中应综合考虑螺距与拱弧的关系以改善Kappel桨的空泡性能。展开更多
In this paper,the scale effect of Kappel tip-rake propellers with different end plate designs was studied using computational fluid dynamics.Given the base size of the mesh and the appropriate numerical model for the ...In this paper,the scale effect of Kappel tip-rake propellers with different end plate designs was studied using computational fluid dynamics.Given the base size of the mesh and the appropriate numerical model for the determined simulation,the open-water performance of three Kappel propellers with different bending degrees of the end plate at different scales was calculated.Comparing the scale effect of these propellers,the scale effect of the torque coefficient of a Kappel propeller is more intense than that of the conventional propeller.In addition,the scale effect of the torque coefficient is strong when the bending degree of the end plate increases,dwarfing the scale effect on the thrust coefficient.Following the research on the scale effect of the wake field for the Kappel propeller,the laws that reveal the influence of the scale on the wake field were summarized;that is,the high-speed zone in the wake relatively expands with the increase of the scale in company with a trend of tip cross flow.The research reveals the basic variation trend and rule of the open-water performance and wake distribution for the Kappel propeller under different scales within the Reynolds number range of 4.665×10^(5)-8.666×10^(7)consideringγtransition,as well as the characteristic differences between the Kappel propellers with different end plate designs,which will be of great significance to its optimization design and application to marine vehicles of different scales.展开更多
文摘为检验Kappel桨的噪声性能,在海军工程大学空泡水洞进行背景噪声测量及2种桨模噪声对比试验。本次试验共设计16组工况,分别测量2种桨在无空泡和有空泡时的噪声。由测量结果分析可知,海军工程大学空泡水洞的声学性能满足试验要求,噪声信号在1-20 k Hz范围内可获得较高的信噪比。无空泡时,Kappel桨与传统桨的辐射噪声相当;在相同转速空泡数σn下,Kappel桨的空化辐射噪声高于传统螺旋桨的,同时观察其空泡形态,与传统螺旋桨相比Kappel桨的空泡形态要为剧烈,表明在空泡性能方面Kappel桨要低于传统螺旋桨,在Kappel桨的设计过程中应综合考虑螺距与拱弧的关系以改善Kappel桨的空泡性能。
基金Supported by the Ningbo Institute of Materials Technology and Engineering affiliated to Chinese Academy of Sciences(Grant No.829203-I22101)TXC(Ningbo)Co.,Ltd.(Grant No.529203-I22004).
文摘In this paper,the scale effect of Kappel tip-rake propellers with different end plate designs was studied using computational fluid dynamics.Given the base size of the mesh and the appropriate numerical model for the determined simulation,the open-water performance of three Kappel propellers with different bending degrees of the end plate at different scales was calculated.Comparing the scale effect of these propellers,the scale effect of the torque coefficient of a Kappel propeller is more intense than that of the conventional propeller.In addition,the scale effect of the torque coefficient is strong when the bending degree of the end plate increases,dwarfing the scale effect on the thrust coefficient.Following the research on the scale effect of the wake field for the Kappel propeller,the laws that reveal the influence of the scale on the wake field were summarized;that is,the high-speed zone in the wake relatively expands with the increase of the scale in company with a trend of tip cross flow.The research reveals the basic variation trend and rule of the open-water performance and wake distribution for the Kappel propeller under different scales within the Reynolds number range of 4.665×10^(5)-8.666×10^(7)consideringγtransition,as well as the characteristic differences between the Kappel propellers with different end plate designs,which will be of great significance to its optimization design and application to marine vehicles of different scales.
