Method for judging flow state of throat-type energy dissipater
A technology of sudden shrinkage and sudden expansion, energy dissipation, applied in water conservancy projects, sea area engineering, coastline protection, etc., to achieve the effect of clear thinking and clear concept
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[0026] A method for distinguishing the flow state of a sudden contraction and expansion type energy dissipator:
[0027] Step 1 Obtain the diameter d of the energy dissipator hole, the diameter D of the spillway tunnel, and the thickness T of the energy dissipator, and calculate the aperture ratio β and the dimensionless thickness α: that is, β=d / D, α=T / D, and at the same time, obtain Hydraulic parameter Reynolds number Re, Re=vD / (μ / ρ), v is the velocity of incoming flow, μ is the dynamic viscosity of water, and ρ is the density of water.
[0028] Step 2 Calculate critical thickness α c ,which is:
[0029] alpha c =(3.33β 4 -8.01β 3 +7.02β 2 -2.68β
[0030] +0.39)×10 -6 Re-46.42β 4 +110.52β 3
[0031] -97.20β 2 +37.41β-4.94
[0032] Step 3 will critical thickness α c Compared with the dimensionless thickness α: when α>α c , it is a plug flow state; when α=α c It is a critical flow state; when αc It is orifice flow state.
[0033] The present invention pro...
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