Study on votex area fluctuating pressure properties of energy dissipation by hydraulic jump with jet clusters

The flow pattern of energy dissipation by hydraulic jump with jet clusters is very complex, and the near-wall votex may affect energy dissipation security. With large-scale model tests, votex area fluctuating pressure properties under a typical operating mode were studied. The results show that the fluctuating pressure can be regarded as a stationary random process. Longitudinal vortex intensity is the maximum, and the pressure fluctuation coefficient is of 0.042-0.081. Vertical vortex intensity is second, and corresponging pressure fluctuation coefficient is of 0.029-0.068. Horizontal vortex intensity is the minimum, and corresponging pressure fluctuation coefficient is of 0.025-0.063. The energy characteristics in the frequency domain reveal the major frequency of flow fluctuating and vortex frequency. The major frequency of flow fluctuating is lower than 0.5 Hz, the frequency of vertical vortex and horizontal vortex is about 2.5 Hz, and longitudinal vortex frequency is about 3.5 Hz.