空泡起始和溃灭阶段的噪声
Noise at Inception and Collapse of a Cavity
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摘要: 本文对孤立空气-水蒸汽空泡,在起始和溃灭阶段的噪声进行了分析.导出了噪声声压及振速的表达式,并进行了具体的计算.计算结果表明:从自由气核发育的起始时刻到空泡溃灭的整个过程中均伴有噪声.空泡噪声主要发生在溃灭阶段的晚期,其声压的数量级可以达到100分贝以上. 在基本声学假定下[1],考虑理想、不可压流体中,孤立空气-水蒸汽空泡在起始和溃灭阶段的噪声,并计及液体的表面张力的影响.Abstract: The paper analyzes the noise at inception and collapse of an isolated bubble cavity filled with gas and vapour. The expressions and their numerical solutions of the sound pressure and the vibration velocity are presented.The results indicate that the noise occurs at every stage of a cavity. The noise has comparatively big value only at the late period of collapse. The sound pressure is of magnitude 100db.
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[1] 罗斯,D.,《水下噪声原理》,海洋出版社(1983). [2] Lighthill,M.J.,Sound generated aerodynamically,Proc. Royal Soc. (London),A267 (1962),147-182. [3] 黄景泉,空化起始条件的确定,应用数学和力学,10,2 (1989),155-159. [4] 黄景泉,空泡溃灭时的流场,应用数学和力学,10,3 (1989),247-251. [5] Knapp,R.T.,J.W. Daily and F.G. Hammitt,Cavitation,McGraw-Hill,New York (1970). -
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