ipolytechiPolytech JournaliPolytech Journal2782-40042782-6341Irkutsk National Research Technical University10.21285/1814-3520-2021-6-720-732ipolytech-546Research ArticleМАШИНОСТРОЕНИЕ И МАШИНОВЕДЕНИЕMACHINE BUILDING AND MACHINE SCIENCEИсследование сегментарного вентиляционного аппарата тормозного диска с определением взаимосвязи аэродинамических и теплообменных характеристик воздушного потокаStudy of a segmented ventilation system of the brake disc and determination of the aerodynamic and heat exchange characteristics of the airflowhttps://orcid.org/0000-0003-0576-5398ПоляковП. А.PolyakovP. A.

Поляков Павел Александрович, кандидат технических наук, доцент, ведущий научный сотрудник, НПЦ «Охрана труда»

344038, г. Ростов-на-Дону, пл. Ростовского Стрелкового Полка Народного Ополчения, 2, Россия

Pavel A. Polyakov, Cand. Sci. (Eng.), Associate Professor, Leading Researcher of the Research and Production Center “Occupational Health and Safety”

2, Rostovskogo Strelkovogo Polka Narodnogo Opol-cheniya Sq., Rostov-on-Don, 344038, Russia

polyakov.pavel88@mail.ruРостовский государственный университет путей сообщенияРоссияRostov State Transport UniversityRussian Federation202111012022256720732Copyright © Поляков П.А., 20222022Поляков П.А.Polyakov P.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://ipolytech.elpub.ru/jour/article/view/546

Цель – определение взаимосвязи аэродинамических и теплообменных характеристик воздушного потока в сегментарном вентиляционном аппарате тормозного диска с улучшением рассеивания тепла в пограничном слое омывающего воздушного потока. В исследованиях использовались классические уравнения тепломассообмена в пограничном слое воздушного потока омываемого вентиляционного аппарата тормозного диска. Для оценки работы данного аппарата применялся метод подобия. Объектом исследований явился сегментарный вентиляционный аппарат тормозного диска. Для подтверждения теоретических изысканий выполнялось CFDмоделирование объекта исследований. Разработаны математические модели вентиляционных аппаратов тормозных дисков со сплошным каналом и каналом со щелями. В качестве критерия оценки эффективности работы вентиляционного аппарата тормозного диска был предложен параметр турбулизации воздушного потока внутри исследуемого аппарата. Полученные аналитические зависимости показали, что с увеличением скорости воздушного потока в 20 раз значение данного параметра снизилось в 1,24 раза. С увеличением температурного перепада в пограничном слое в 8 раз параметр турбулизации увеличился в 86,2 раза. На основании предложенного критерия оценки эффективности работы был проведен расчет аэродинамических и теплообменных характеристик объекта исследований. По результатам расчета предложена взаимосвязь конструктивных параметров сегментарного вентиляционного аппарата с улучшением рассеивания тепла в пограничном слое омывающего воздушного потока. Проведенное CFD-моделирование подтвердило теоретические исследования аэродинамических характеристик сегментарного вентиляционного аппарата тормозного диска. Данную математическую модель совместно с параметром турбулизации возможно применять при проектировании современных вентилируемых тормозных дисков и для оценки существующих узлов охлаждения фрикционных узлов. Это необходимо для минимизации возникновения ситуации снижения теплообменных процессов.

This study aims determine a relationship between the aerodynamic and heat exchange characteristics of the air flow in a segmented ventilation system of the brake disc with improved heat dissipation in the boundary layer of the air flow. Classical equations of heat and mass transfer in the boundary layer of the air flow cooling the brake disc ventilation chamber were used. The cooling performance of the system was assessed using the method of similarity. The obtained theoretical findings were confirmed by CFD-modelling. Mathematical models were developed for vented discs with both continuous grooves and slotted grooves. A criterion for assessing the performance of brake disc ventilation systems was proposed, consisting in turbulization of the air flow inside the device under study. According to the obtained analytical dependencies, a 20-fold acceleration of the air flow decreases the turbulization parameter by 1.24 times. An increase in the temperature difference in the boundary layer by 8 times leads to an increase in the turbulization parame-ter by 86.2 times. Using the criterion proposed for assessing the work performance, the aerodynamic and heat exchange characteristics of the system under study were calculated. As a result, a relationship between the design parameters of the segmented ventilation system and improved heat dissipation in the boundary layer of the cooling air flow is proposed. The conducted CFD modelling confirmed the aerodynamic characteristics of the system under study obtained theoretical-ly. This mathematical model together with the turbulization parameter can be used when both developing modern vented brake discs and assessing the existing cooling systems of friction units in order to minimize the possibility of reduced heat exchange processes.

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