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管路系统的噪声主要来自控制阀和高速机械。由弯头、三通、型锻接头等较轻微不连续性引起的流动噪声与之相比可忽略不计。当阀门噪声占主导地位时,阀门通道和管路系统的平滑程度并不重要。下面讨论管路中噪声产生的机理和为降低噪声可采取的方法。一、阀门噪声的机理一个扩张喷嘴在运动和静止的流体之间的界面上产生强烈的剪切应力,其结果是产生涡流和噪声。粘滞剪切应力是典型的喷嘴噪声来
The noise of the piping system mainly comes from the control valve and high-speed machinery. The flow noise caused by minor discontinuities such as elbows, tees and swaging joints is negligible. When valve noise is dominant, the smoothness of the valve passage and piping system does not matter. The following discusses the mechanism of noise generation in the pipeline and the methods that can be taken to reduce the noise. First, the valve noise mechanism An expanding nozzle in the movement and stationary fluid interface between the intense shear stress, the result is the generation of vortex and noise. Viscous shear stress is a typical nozzle noise