CN110298080A - Floating nuclear power plant warm water discharge thermal diffusion method for numerical simulation based on CFD - Google Patents
Floating nuclear power plant warm water discharge thermal diffusion method for numerical simulation based on CFD Download PDFInfo
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- 238000009792 diffusion process Methods 0.000 title claims abstract description 21
- 238000004088 simulation Methods 0.000 title claims abstract description 20
- 239000000498 cooling water Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000004364 calculation method Methods 0.000 claims abstract description 8
- 230000008859 change Effects 0.000 claims abstract description 6
- 238000013178 mathematical model Methods 0.000 claims abstract description 6
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- 239000012530 fluid Substances 0.000 claims description 14
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- 238000012546 transfer Methods 0.000 claims description 3
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- 230000017525 heat dissipation Effects 0.000 claims description 2
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Abstract
The present invention relates to a kind of floating nuclear power plant warm water discharge thermal diffusion method for numerical simulation based on CFD, this method comprises: establishing warm water discharge three-dimensional physical model；Certain computer capacity is extended as numerical simulation calculation region to hull surrounding respectively；Three-dimensional grid division is carried out to floating nuclear power plant warm water discharge computational domain；Respective flow mathematical model is selected in fluent；Corresponding boundary condition is selected to recirculated cooling water water intake and outlet, computational domain boundary and ship wall surface；Selection calculates convergence format, determines and calculates initial value, floating nuclear power plant warm water discharge thermal diffusion Temperature Distribution, VELOCITY DISTRIBUTION is calculated, and counts recirculated cooling water intake discovery direction ocean temperature distribution curve；Confluence analysis is carried out to calculating in conjunction with respective country statutory standard to need to change water intake and outlet relative position or taking and discharging heat flux if being unsatisfactory for standard requirements and recalculated, until calculated result meets laws and regulations requirement.
Description
Technical field
The present invention relates to Numerical simulation of cooling water, in particular to a kind of floating nuclear power plant warm water discharge thermal diffusion based on CFD
Method for numerical simulation belongs to fluid interchange emulational computation field.
Background technique
An important component of the circulation as nuclear power station owner's Turbo-generator Set, using water circulating pump from neighbour
Coastal waters domain extracting seawater carries out heat exchange heel row to surrounding sea, high temperature as cooling medium, with main condenser high temperature steam
Draining can not only be such that surrounding water temperature increases, and form heat enrichment, also will affect water quality, and then bring to water ecological setting huge
It is big to influence.
Floating nuclear power plant is still in the technical research stage, and there is no the experimental study of corresponding warm water discharge, Numerical-Modes at this stage
Quasi- research is also very little.It focuses mostly at this stage using seaside nuclear power station as the test of prototype and simulation greatly to the research of warm water discharge
Research, technology relative maturity, since floating nuclear power plant setting is different from seaside nuclear power station, farther out from seashore, warm water discharge
Dilution diffusion process head seashore influence it is smaller, bigger, therefore conventional seaside nuclear power station warm water discharge thermal expansion is influenced by ocean current
Scattered rule is not necessarily applied to floating nuclear power plant.Thus, it is necessary to study a kind of warm water discharge thermal expansion for floating nuclear power plant
Dissipate method for numerical simulation.
Summary of the invention
Present invention aims to overcome that above-mentioned the deficiencies in the prior art and provide it is a kind of based on CFD floating nuclear power plant temperature row
Hydro-thermal spreads method for numerical simulation, utilizes CFD (Computational Fluid Dynamics, computational fluid dynamics), mould
Influence caused by quasi- simulation calculation recirculated cooling water warm water discharge thermal diffusion to surrounding sea and intake temperature.
Realize the object of the invention the technical solution adopted is that a kind of floating nuclear power plant warm water discharge thermal diffusion numerical value based on CFD
Analogy method, this method comprises:
S1, physical model are established: establishing warm water discharge three-dimensional physical model；
S2, computational domain are expanded: extending certain computer capacity as numerical simulation calculation region to hull surrounding respectively；
S3, model meshes divide: carrying out three-dimensional grid division to floating nuclear power plant warm water discharge computational domain；
S4, mathematical model are established: respective flow mathematical model is selected in fluent；
S5, boundary condition setting: corresponding side is selected to recirculated cooling water water intake and outlet, computational domain boundary and ship wall surface
Boundary's condition；
S6, design conditions initialization and calculating: selection calculates convergence format, determines calculating initial value, floating is calculated
Thermal discharge waterfrom nuclear power plant thermal diffusion Temperature Distribution, VELOCITY DISTRIBUTION, and count recirculated cooling water intake normal direction ocean temperature point
Cloth curve；
S7, interpretation of result and processing: in conjunction with respective country statutory standard to progress confluence analysis is calculated, if being unsatisfactory for standard
It is required that then needing to change water intake and outlet relative position or taking and discharging heat flux and being recalculated, until calculated result accords with
Close laws and regulations requirement.
Warm water discharge thermal diffusion method for numerical simulation through the invention, can according to recirculated cooling water warm water discharge heat flow, take
Discharge outlet sectional area, sea area ocean current speed, sea area surface determine warm water discharge thermal diffusion to parameters such as the integrated heat transfer coefficients of air
The flow field Temperature Distribution of formation, so that it is determined that whether surrounding sea and circulating cooling water inlet seawater are affected, temperature is increased
Range show that circulation dependency structure designs and whether is parameter designing whether within international standard prescribed limit accordingly
It meets the requirements, what obtains optimization design scheme from.
The invention has the following advantages that
The method of the present invention is by establishing warm water discharge Three-dimensional CAD using computational fluid dynamics software fluent, to floating
Dynamic thermal discharge waterfrom nuclear power plant thermal diffusion carries out Three-dimensional simulation, makes up experimental condition deficiency and correlative study experience deficiency is brought
The drawbacks of, and save time cost.According to calculated result to floating nuclear power plant recirculated cooling water layout of water intakes and outlets mode and phase
Position is adjusted, meets content as defined in national corresponding statutory standard to reach.It is tested compared to traditional seaside nuclear power station
Method, the present invention has at low cost, fireballing advantage, and designs floating nuclear power plant system and provide technical support.
Detailed description of the invention
Fig. 1 is the flow chart of the floating nuclear power plant warm water discharge thermal diffusion method for numerical simulation the present invention is based on CFD.
Specific embodiment
The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
As shown in Figure 1, the present invention is based on the floating nuclear power plant warm water discharge thermal diffusion numerical simulation method packets of CFD technology
Include following steps:
S1, floating nuclear power plant physical model is established using ICEM
The present embodiment is based on " Luo Mengnuosuofu academician " number, establishes 1:1 floating nuclear power plant physical model using ICEM software；
Whole captain 140m, beam 30m, draft 5.5m；Initial option recirculated cooling water layout for water intake alow portion apart from ship
The position of bow 25m, shipboard 6m；Discharge outlet is arranged in two lateral extent bottom 1m of ship, the position apart from stem 38m；Water intake and outlet is equal
It is 4.0 (captain direction) × 1.5m for cross-sectional area2；Water intake and outlet port and starboard is symmetrical.
S2, warm water discharge computational domain is established using ICEM
Based on physical model respectively around with the sea area sea-floor spreading 100m × 100m × 30m, formed 230m ×
The zoning of 340m × 30m.
S3, the Three-dimensional unstructured grid of computational domain is divided using ICEM
Unstructured grid division is carried out to zoning using ICEM software, at recirculated cooling water water intake and outlet section
Mesh refinement is carried out, using tetrahedral grid type, total lattice number is 513212.
S4, computation model selection
In computational fluid dynamics software fluent, the stable state solver based on pressure is set, solution is kept to be set as silent
Recognize parameter, and set gravity direction, activation energy equation, using incompressible standard k-ε turbulence model, governing equation, which uses, to be had
It is discrete to limit volumetric method progress, specific as follows:
Coefficient expressions: μe=μ+μt；
In formula: xiIndicate three-dimensional coordinate direction, uiFor fluid flow rate, k is Turbulent Kinetic, and ε is dissipation turbulent kinetic energy, and T is
Ocean temperature, cpFor specific heat at constant pressure, μ is molecular viscosity coefficient；μeFor turbulent flow limited tack coefficient；μtFor coefficient of eddy viscosity；ρ
For fluid density；ζk、ζεAnd ζTRespectively Prandtl number corresponding to k, ε and T；QRFor internal system unit time unit mass
Total amount of heat on fluid；Calorie source on unit mass fluid to discharge internal system in the unit time converges；For
Heat dissipation capacity of the unit mass fluid to atmosphere in unit time；δSDiscontinuous function is indicated, when in water surface δS=1.0, when the water surface with
Under, δS=0.0；ksFor Water surface evaporation coefficient；TSFor water surface temperature；T∞For environment water temperature；C1ε、C2εAnd CμFor constant；
In the present embodiment, C1ε=1.44, C2ε=1.92, Cμ=0.09, ζk=1.0 and ζε=1.3.
S5, the input of seawater physical parameter and boundary condition setting:
S5.1, in view of buoyancy lift can have an impact thermal diffusion process, need to obtain seawater in certain temperature section model
Interior thermal physical property parameter is enclosed, obtains the physical parameter of water intake and outlet temperature range and defeated using hot Calculation of Physical Properties software PREPROP
Enter Fluent software for calculation；
S5.2, boundary condition setting:
Solid keeps away face: hull bottom face and side are accordingly to be regarded as without sliding adiabatic solid boundary condition, and enter seawater from soil
Heat is little, can be considered adiabatic boundary；
Outfall and infall: outfall and infall selects speed inlet boundary condition, and flow velocity is 0.3m/s, takes, temperature at discharging condensate
Respectively 24 DEG C and 30 DEG C；
Ocean current inlet and outlet: computational domain ocean current entrance selects speed inlet boundary, egress selection pressure export boundary；
Computational domain distal end: the flowing of computational domain distal end reaches stable, and medium physical parameter does not change, i.e.,
Using symmetrical border, f indicates that medium a certain kind physical parameter, n indicate normal direction；
The water surface: meteorological data is brought in the influence after consideration wind speed and additional heat when water body overtemperature to coefficient of heat transfer into
Average Water surface evaporation coefficient k is calculated in Gunnerberg empirical equations=35.8w/m2。
S6, design conditions initialization and calculating
Flow field is initialized, selection calculates convergence format, determines and calculate initial value, and floating nuclear power plant warm water discharge heat is calculated
Diffusion temperature distribution, VELOCITY DISTRIBUTION, and count recirculated cooling water intake normal direction ocean temperature distribution curve.S7, result
Analysis and processing
And using temperature at intake normal direction 0.5m as temperature rise critical point, investigate whether temperature rise herein is more than national mark
Range as defined in standard；When calculated result and standard are runed counter to, changes relative distance between water intake and outlet, re-start calculating, directly
The position minimum to acquisition temperature rise.
Above-mentioned detailed description is illustrating for possible embodiments of the present invention, and the embodiment is not to limit this hair
Bright the scope of the patents, it is all without departing from the so-called equivalence enforcement of the present invention or change, it is intended to be limited solely by the scope of the patents of this case.
Claims (4)
1. a kind of floating nuclear power plant warm water discharge thermal diffusion method for numerical simulation based on CFD characterized by comprising
S1, physical model are established: establishing warm water discharge three-dimensional physical model；
S2, computational domain are expanded: extending certain computer capacity as numerical simulation calculation region to hull surrounding respectively；
S3, model meshes divide: carrying out three-dimensional grid division to floating nuclear power plant warm water discharge computational domain；
S4, mathematical model are established: respective flow mathematical model is selected in fluent；
S5, boundary condition setting: corresponding perimeter strip is selected to recirculated cooling water water intake and outlet, computational domain boundary and ship wall surface
Part；
S6, design conditions initialization and calculating: selection calculates convergence format, determines calculating initial value, floating nuclear power is calculated
It stands warm water discharge thermal diffusion Temperature Distribution, VELOCITY DISTRIBUTION, and it is bent to count the distribution of recirculated cooling water intake normal direction ocean temperature
Line；
S7, interpretation of result and processing: it in conjunction with respective country statutory standard to progress confluence analysis is calculated, is wanted if being unsatisfactory for standard
It asks, then need to change water intake and outlet relative position or taking and discharging heat flux and is recalculated, until calculated result meets
Laws and regulations requirement.
2. the floating nuclear power plant warm water discharge thermal diffusion method for numerical simulation based on CFD according to claim 1, it is characterised in that
In the step S4, respective flow mathematical model is selected in fluent software for calculation to use incompressible standard k- ε turbulent flow
Model, governing equation are carried out discrete using finite volume method:
Coefficient expressions: μe=μ+μt；
In formula: xiIndicate three-dimensional coordinate direction, uiFor fluid flow rate, k is Turbulent Kinetic, and ε is dissipation turbulent kinetic energy, and T is seawater
Temperature, cpFor specific heat at constant pressure, μeFor turbulent flow limited tack coefficient；μ is molecular viscosity coefficient；μtFor coefficient of eddy viscosity；ρ is stream
Volume density；ζk、ζεAnd ζTRespectively Prandtl number corresponding to k, ε and T；QRFor internal system unit time unit mass fluid
On total amount of heat；Calorie source on unit mass fluid to discharge internal system in the unit time converges；When for unit
Heat dissipation capacity of the interior unit mass fluid to atmosphere；δSDiscontinuous function is indicated, when in water surface δS=1.0, when in the water surface hereinafter, δS
=0.0；ksFor Water surface evaporation coefficient；TSFor water surface temperature, T∞For environment water temperature；C1ε、C2εAnd CμFor constant.
3. the floating nuclear power plant warm water discharge thermal diffusion method for numerical simulation based on CFD, feature exist according to claim 2
In: using hot Calculation of Physical Properties software PREPROP obtain water intake and outlet temperature range physical parameter and input Fluent calculate it is soft
Part.
4. the floating nuclear power plant warm water discharge thermal diffusion method for numerical simulation based on CFD according to claim 3, it is characterised in that
The boundary condition of the step S5 is arranged
Solid keeps away face: hull bottom face and side are accordingly to be regarded as without sliding adiabatic solid boundary condition；
Outfall and infall: outfall and infall selects speed inlet boundary condition；
Ocean current inlet and outlet: computational domain ocean current entrance selects speed inlet boundary, egress selection pressure export boundary；
Computational domain distal end: the flowing of computational domain distal end reaches stable, and medium physical parameter does not change, i.e.,Using
Symmetrical border, f indicate that medium a certain kind physical parameter, n indicate normal direction；
The water surface: meteorological data is brought in the influence after consideration wind speed and additional heat when water body overtemperature to coefficient of heat transfer into
Average Water surface evaporation coefficient k is calculated in Gunnerberg empirical equations。
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110728064A (en) * | 2019-10-18 | 2020-01-24 | 河海大学 | Riverbank subsurface flow zone hydrothermal coupling modeling method based on COMSOL mathematical module |
| CN111125804A (en) * | 2019-12-03 | 2020-05-08 | 合肥通用机械研究院有限公司 | Numerical simulation-based water injection adjusting method for high-pressure air cooling system of hydrogenation device |
| CN112214937A (en) * | 2020-09-09 | 2021-01-12 | 黄冈格罗夫氢能汽车有限公司 | Optimal design method and system for hydrogen energy automobile cooling pipeline |
| CN115147239A (en) * | 2022-06-10 | 2022-10-04 | 自然资源部第一海洋研究所 | Calculation method for environmental background water temperature of newly-built coastal power plant temperature rise area and temperature rise calculation method |
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| CN110728064A (en) * | 2019-10-18 | 2020-01-24 | 河海大学 | Riverbank subsurface flow zone hydrothermal coupling modeling method based on COMSOL mathematical module |
| CN110728064B (en) * | 2019-10-18 | 2021-11-30 | 河海大学 | Riverbank subsurface flow zone hydrothermal coupling modeling method based on COMSOL mathematical module |
| CN111125804A (en) * | 2019-12-03 | 2020-05-08 | 合肥通用机械研究院有限公司 | Numerical simulation-based water injection adjusting method for high-pressure air cooling system of hydrogenation device |
| CN111125804B (en) * | 2019-12-03 | 2023-09-01 | 合肥通用机械研究院有限公司 | Water injection adjusting method for high-pressure air cooling system of hydrogenation device based on numerical simulation |
| CN112214937A (en) * | 2020-09-09 | 2021-01-12 | 黄冈格罗夫氢能汽车有限公司 | Optimal design method and system for hydrogen energy automobile cooling pipeline |
| CN115147239A (en) * | 2022-06-10 | 2022-10-04 | 自然资源部第一海洋研究所 | Calculation method for environmental background water temperature of newly-built coastal power plant temperature rise area and temperature rise calculation method |
| CN115147239B (en) * | 2022-06-10 | 2023-04-07 | 自然资源部第一海洋研究所 | Method for calculating environmental background water temperature and calculating temperature rise of newly-built coastal power plant temperature rise area |
| US20240152662A1 (en) * | 2022-06-10 | 2024-05-09 | First Institute of Oceanography, Ministry of Natural Resources | Method for reckoning environmental background water temperature and calculating temperature rise in temperature rise area of newly-built coastal power plant |
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