Critical flow velocity analysis method for evaluating flow-induced vibration of tube bundle structure based on CFD
A critical flow rate and analysis method technology, applied in the field of nuclear power plant structural mechanics, can solve the problems that the interaction of excitation mechanism cannot be considered at the same time, and the critical flow rate cannot be determined and predicted, so as to eliminate the vortex shedding effect, improve the accuracy of analysis and design, and ensure reasonable sexual effect
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Embodiment 1
[0049] Example 1: A CFD-based critical flow velocity analysis method for flow-induced vibration evaluation of tube bundle structures, such as figure 1 shown, including the following steps:
[0050] S1: According to the pre-built flow-induced vibration analysis model, the flow-induced vibration behavior of the corresponding tube bundle structure is simulated, and the flow-induced vibration response package consisting of flow-induced vibration responses at multiple flow rates is obtained. The flow-induced vibration response includes the flow-induced vibration response of the pipe Physical force time history, vibration displacement time history and the correlation coefficient between lift force and displacement;
[0051] S2: According to the flow-induced vibration response package, determine whether the flow-induced vibration characteristics of the corresponding tube bundle structure belong to the first preset range; if so, draw the functional relationship between the effective a...
Embodiment 2
[0066] On the basis of the critical flow velocity analysis method of flow-induced vibration of the tube bundle structure based on CFD in Example 1, the fluid medium is set as water, and all other parameters are exactly the same as in Example 1.
[0067] Calculate the lift time history and displacement time history acting on the vibrating tube under different inlet flow velocities, and then calculate the correlation coefficient between lift force and displacement. In this example, the correlation coefficient between lift and displacement is greater than 0.8, which belongs to the first preset range, and then the functional relationship between the effective amplitude of the pipe and the flow velocity is drawn, as shown in Figure 8 shown. Then it can be seen that the functional relationship curve between the effective amplitude of the pipe and the flow velocity in this embodiment cannot be tangent, so the threshold value method is used to determine the critical flow velocity, wh...
Embodiment 3
[0069] On the basis of the critical flow velocity analysis method for flow-induced vibration of a tube bundle structure based on CFD in Example 1, the fluid medium is set to be water, and the mass per unit length of the tube is m l =3, all the other parameters are exactly the same as in Example 1.
[0070] Calculate the lift time history and displacement time history acting on the vibrating tube under different inlet flow velocities, and then calculate the correlation coefficient between lift force and displacement. In this example, the correlation coefficient between lift and displacement is greater than 0.8, which belongs to the first preset range, and then the functional relationship between the effective amplitude of the pipe and the flow velocity is drawn. The functional relationship between the effective amplitude of the pipe and the flow velocity in this embodiment has a clear tangent , so the critical velocity is determined by the tangent method, such as Figure 9 As ...
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