开孔结构内压传递方程的适用性分析

Applicability analysis on transfer equation of internal pressure for opening structures

为了研究单一开孔结构内压的传播机理,采用理论推导结合模型实验提出内压传递方程的新形式.考虑到国外学者提出的方程普遍存在低估孔口阻尼值这一不足,从N-S方程出发结合层流边界层理论,推导单一开口结构内外压传递的方程.对6种不同开孔条件下的模型进行扬声器激振试验,以获得内压时程曲线.通过拟合实测内压曲线,来考察不同方程的适用性.研究结果表明,所推导的新方程与国外学者提出的方程相比能够准确地预测开孔模型内压幅值和阻尼.

In order to understand internal pressure propagation mechanism of single opening structures, a new form of internal and external pressure transfer equation was proposed using theoretical analysis and model experiment investigation. In consideration of shortage that equations suggested by foreign researchers usually underestimate damping in orifice,N-S equation and boundary-layer theory of laminar flow were used to deduce a new transmittance equation between internal and external pressure for single opening structure. Internal pressure of a model in six different opening cases was tested by excitation of a loud speak which is a special self-developed device for internal pressure study. By fitting the measured internal pressure curves, the applicability of different equations can be examined. The research results show the equation suggested by author is more accurate than the one proposed by foreign researcher in predicting damping and amplitude of internal pressure in opening models.