双射流喷嘴射流空化噪声小波分析初探

Study on Cavitation Noises of Dual-Jet Nozzles by the Wavelet Analysis Method

开展喷嘴空化性能研究,对增大射流作用效果,提高其工业应用效能具有非常重要的意义。试验研究了双射流喷嘴在不同围压下的空化性能,并应用小波分析方法研究了在围压条件下双射流喷嘴空化射流噪声声压级特性和规律。结果表明:双射流喷嘴比普通锥形喷嘴具有更强的空化初生能力,在较高围压下仍有空化现象;围压小于 5MPa时双射流喷嘴空化性能受围压影响很小,且不同射流压力下的空化性能相差不明显;在试验条件下,双射流喷嘴射流噪声声压级统计均值在186 dB以上时,有明显的空化现象。

It＇s of great significance to research into the inception ability of nozzles and enhancement of their effects to improve efficiencies in industries. Cavitation performances of dual-jet nozzles are tested at different ambient pressures. This paper presents the wavelet analysis results of experimental data on cavitation abilities and feature of dual-jet nozzles under different ambient pressures. The results show that the dual jet nozzle can still produce cavitation under higher ambient pressure; when ambient pressure is less than 5 MPa, its changes slightly influence the result. In the experiment, the average statistical number of the sound pressure level are above 186dB, which is considered to have obvious cavitation.