energyЭнергетика. Известия высших учебных заведений и энергетических объединений СНГENERGETIKA. Proceedings of CIS higher education institutions and power engineering associations1029-74482414-0341BNTUenergy-809Research ArticleТЕПЛОЭНЕРГЕТИКАНEAT POWER ENGINEERINGМОДЕЛИРОВАНИЕ БАШЕННОЙ ИСПАРИТЕЛЬНОЙ ГРАДИРНИ И ВЛИЯНИЯ АЭРОДИНАМИЧЕСКИХ ЭЛЕМЕНТОВ НА ЕЕ РАБОТУ В УСЛОВИЯХ ВЕТРАSIMULATION OF COOLING TOWER AND INFLUENCE OF AERODYNAMIC ELEMENTS ON ITS WORK UNDER CONDITIONS OF WINDДобрегоК. В.DobregoK. V.

Доктор физико-математических наук, профессор

dobreqo@bntu.byХеммасиан КашаниМ. М.Hemmasian KashaniM. M.

Аспирант

dobreqo@bntu.byЛаскоЕ. Е.LaskoE. E.

Студент

dobreqo@bntu.byБелорусский национальный технический университетБеларусьBelarusian National Technical UniversityBelarusИнститут тепло- и массообмена имени А. В. Лыкова НАН БеларусиБеларусьA. V. Luikov Heat and Mass Transfer Institute of the National Academy of Sciences of BelarusBelarus201420122014064760Copyright © Добрего К.В., Хеммасиан Кашани М.M., Ласко Е.Е., 20142014Добрего К.В., Хеммасиан Кашани М., Ласко Е.Е.Dobrego K.V., Hemmasian Kashani M.M., Lasko E.E.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://energy.bntu.by/jour/article/view/809

Современные башенные испарительные градирни могут использовать разнообразные аэродинамические элементы (дефлекторы, ветроперегородки и др.) для улучшения тепловой работы, особенно в условиях ветра. В статье численно исследуется влияние завихрителей в надоросительном пространстве и ветроперегородок на производительность башенной испарительной градирни в условиях ветра. В качестве прототипа взята действующая башенная испарительная градирня ТЭС «Ву-Джин», Китай. При расчетах использовали аналогию тепло- и массопереноса, что позволило рассмотреть аэродинамику однофазного потока и выполнить детальные трехмерные расчеты на современных персональных вычислительных машинах. Коэффициент теплоотдачи оросителя и его гидродинамическое сопротивление устанавливали в соответствии с экспериментальными данными по общему расходу воздуха в градирне. Численная модель протестирована с использованием экспериментальных данных.

Продемонстрирована нелинейная зависимость тепловой производительности башенной испарительной градирни от скорости ветра с минимумом (критическая скорость ветра) при ucr ~ 8 м/с для моделируемой системы. Использование крестообразных ветроперегородок существенно не изменяет критическую скорость ветра, но улучшает тепловую работу при умеренном и сильном ветре. Совместное использование ветроперегородок и завихрителей в надоросительном пространстве может повысить эффективность башенной испарительной градирни на величину до 20–30 % при угле установки завихрителей α = 60o. Расчеты позволяют анализировать аэродинамические структуры, возникающие в башенной испарительной градирне, и однородность поля скоростей в области оросителя.

Результаты исследования могут быть полезны для оптимизации конструкции градирен, в том числе и перспективных градирен гибридного типа.

Modern Cooling Towers (CT) may utilize different aerodynamic elements (deflectors, windbreak walls etc.) aimed to improvement of its heat performance especially at the windy conditions. In this paper the effect of flow rotation in overshower zone of CT and windbreak walls on a capacity of tower evaporating unit in the windy condition is studied numerically. Geometry of the model corresponds to real Woo-Jin Power station, China. Analogy of heat and mass transfer was used that allowed to consider aerodynamic of one-dimension flow and carried out detailed 3D calculations applying modern PC. Heat transfer coefficient of irrigator and its hydrodynamic resistance were established according to experimental data on total air rate in cooling tower. Numerical model is tested and verified with experimental data.

Nonlinear dependence of CT thermal performance on wind velocity is demonstrated with the minimum (critical wind velocity) at ucr ~ 8 m/s for simulated system. Application of windbreak walls does not change the value of the critical wind velocity, but may improves performance of cooling unit at moderate and strong wind conditions. Simultaneous usage of windbreak walls and overshower deflectors may increase efficiency up to 20–30 % for the deflectors angle a = 60o. Simulation let one analyze aerodynamic patterns, induced inside cooling tower and homogeneity of velocities’ field in irrigator’s area.

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The authors declare that there are no conflicts of interest present.