A Jet Axis Calculation Method of Vertical Buoyancy Jet in Tidal Environment
A flow axis and jet flow technology, applied in the field of jet axis calculation of vertical buoyancy jet in tidal current environment, can solve the problems of lack of calculation method of jet axis, complex law of jet dilution and diffusion, etc.
Active Publication Date: 2016-09-28
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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Problems solved by technology
The movement of the buoyant jet in the tidal current is affected by the jet's own outflow, buoyancy, and environmental tidal currents with time characteristics. The law of dilution and diffusion of the jet is very complicated, so there has been a lack of corresponding calculation methods for the jet axis.
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Embodiment 1
[0028] This embodiment is a method for calculating the jet axis of a vertical buoyant jet in a tidal current environment.
[0029] The jet axis refers to the line of maximum concentration in the jet concentration profile, which reflects the movement trajectory of the jet pollutants (sewage, hot water). Such as figure 1 As shown, for the case where the jet flows vertically upwards and has an angle of 90° with the ambient flow, that is, the vertical jet in the cross flow, the jet axis is curved with the flow. The abscissa of the jet axis uses the relative distance from the jet nozzle x / D Indicates the relative height from the nozzle z / D Means where D Is the inner diameter of the spout.
[0030] This embodiment combines the characteristics of tidal currents in natural tidal waters and uses a large-scale, high-frame-rate PLIF technology to study the evolution of the concentration field of a vertical buoyant jet during a complete tidal cycle. R (Jet velocity U o Flow velocity U a R...
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The invention relates to a method for calculating a jet axis of a vertical buoyant jet in a tide environment. The method comprises the following steps of: acquiring data; calculating a flow velocity ratio; obtaining the jet axis; performing nondimensionalization; performing linear fitting to obtain a slope; obtaining an initial section jet axis formula; obtaining a bent section jet curve in logarithmic coordinates at each moment; obtaining a bent section jet axis formula; and forming a complete formula. According to the method, the whole jet curve of the vertical jet in the tide condition is divided into an initial section curve and a bent section curve, and the initial section curve and the bent section curve are fitted and described by a straight line and a power function curve which are related with the flow velocity ratio respectively, so that an accurate calculation formula for the whole jet curve in the complete tide cycle process is finally obtained, and a powerful basis is provided for engineering design of vertical buoyant jet outlets.
Description
Technical field [0001] The invention relates to a method for calculating the jet axis of a vertical buoyant jet in a tidal current environment, which is an environmental hydraulics calculation method, and is suitable for industrial wastewater and power plants that adopt vertical outflow drainage methods in tidal waters such as estuaries and oceans. Calculation method of jet axis for warm drainage. Background technique [0002] Vertical buoyant jets are a common way to discharge sewage and heat in tidal waters such as estuaries and oceans. The jet axis of the buoyant jet reflects the movement trajectory of sewage and hot water, which is of great significance for engineering design and environmental impact assessment. For a long time, there has been a relatively clear calculation method for vertical buoyant jet discharge in static or constant water flow. my country's coastal areas have rapid economic development and dense industries, and many vertical buoyant jet discharge outlet...
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IPC IPC(8): G06F17/50
Inventor 赵懿珺曾利贺益英吴一红陈小莉张海文
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES