材料期刊网

以高炉热风炉输入管路为背景，按1:120比例建立了有多个90°转弯和一个文氏管的水力模型，考察了不同入口流速激励下管路共振和极限共振时频率与功率谱特征，得到了极限共振时主要频率的功率值是共振时的上千倍及是非共振时上万倍的测量结果，以及共振、极限共振的主频幅值与管流速呈e指数变化规律。指出当主频幅值在能级跃迁以下的共振是可以控制和利用的，而当主频幅值出现能级跃迁的极限共振会对工业管路造成致命的破坏。同时利用CCD系统观察了管路激振区域内流体漩涡结构的急剧变化，流动显示证明，加大管流入口流速，促使管内湍流激化，而湍流中漩涡的生成和脱落是诱发共振及达到极限共振的主要因素。

Based on the model of hot blast pipeline for blast, a hydraulic model of venturi tube pipeline with many 90 degree bends and ratio of 1:120 was established. The characteristics of frequency and power spectra in the pipeline at the condition of resonance and extreme resonance with different entrance velocities were studied. The results showed that the value of the power spectra in main frequency at the condition of the extreme resonance was several thousand times compared to the value at the early stage of resonance, and about ten thousand times compared to the energy when no vibration. Moreover, the amplitude both of the resonance and of the extreme resonance, as well as the velocity of flow are followed the exponential function relationship. The resonance of main frequency under the energy levels transition could be controlled and utilized. The extreme resonance, however, would produced mortal destroy to the industry pipeline when the energy levels transition arises. The intense change of internal structure of the fluid vortex in the exciting zone was observed by the CCD system. The flow showed that the turbulent flow was intensified with increasing in the entrance velocity of the flow. The periodic generation and shedding of the periodic vortex in intensive turbulent flow was the main factor that induced the resonance into the extreme resonance.