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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference 2006 vol.4 pt.B: Fluid-Structure Interaction >COMBINING METHODS OF FLUID TRANSIENTS AND ACOUSTICS IN ANALYSIS OF PRESSURE PULSATION IN TAPERED CHANNELS
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COMBINING METHODS OF FLUID TRANSIENTS AND ACOUSTICS IN ANALYSIS OF PRESSURE PULSATION IN TAPERED CHANNELS

机译：锥形通道压力脉动分析中流体瞬变与声波的组合方法

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Pressure wave propagation problems in liquids have traditionally been solved using the methods of fluid transients, I.e. methods of characteristics and impedance. For gases the equations of acoustics are employed. In short pipe lines, in which friction can be ignored, the equations of fluid transients reduce into the form of the wave equation used in acoustics in a channel of constant cross-section. If the wave motion is harmonic, the one-dimensional Webster's equation and the impedance method yield exactly the same results in tapered channels. The boundary conditions are the known pressure amplitude upstream and zero pressure at the channel outlet. These two methods have been compared for solving wave propagation problems in tapered channels used in many different industrial applications. It was found that these two methods yield exactly the same results, which are also the same as those obtained numerically with the method of characteristics. A desired quality of the tapered channel in many different industrial processes is to minimize the volume flow rate oscillation at the channel outlet. This can be achieved by changing the channel shape from the traditional linear taper, the parabolic shape giving the lowest amplitude. The effect of different quantities such as oscillation frequency and channel dimensions on volume flow rate oscillation was shown. Also, the effect of free air which affects the wave speed was studied. Since the acoustical and fluid transients approaches give identical results in a one-dimensional case, the acoustics method was employed in a three-dimensional problem, which consists of a flow spreader and a tapered channel configuration, and it was solved with the commercial FEM code Abaqus. The results show that there is a variation in the volume flow rate oscillation along the tapered channel width. The three-dimensional computational results can only be verified by measuring the velocity oscillation at the outlet of the tapered channel. The particle image velocimetry (PIV) measurements are in progress at the moment.
机译：传统上已经使用流体瞬变的方法，即流体压力法解决了压力波在液体中的传播问题。特性和阻抗的方法。对于气体，采用声学方程。在可以忽略摩擦的短管道中，流体瞬变方程简化为恒定截面通道中的声学波方程。如果波动是谐波，则一维Webster方程和阻抗方法在锥形通道中得出的结果完全相同。边界条件是上游的已知压力幅度和通道出口的零压力。为了解决在许多不同工业应用中使用的锥形通道中的波传播问题，已经比较了这两种方法。发现这两种方法产生完全相同的结果，也与使用特征方法数值获得的结果相同。在许多不同的工业过程中，锥形通道的理想质量是使通道出口处的体积流率振荡最小化。这可以通过改变传统线性锥度的通道形状来实现，抛物线形状的振幅最低。示出了诸如振荡频率和通道尺寸之类的不同量对体积流量振荡的影响。另外，研究了自由空气对波速的影响。由于声学和流体瞬态方法在一维情况下给出的结果相同，因此在三维问题中采用了声学方法，该方法由分流器和锥形通道构造组成，并通过商业FEM代码进行了求解阿巴克斯结果表明，沿着锥形通道宽度，体积流量振荡存在变化。三维计算结果只能通过测量锥形通道出口处的速度振荡来验证。目前正在进行粒子图像测速（PIV）测量。

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