Abstract
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.
Highlights
Study of a segmented ventilation system of the brake disc and determination of the aerodynamic and heatexchange characteristics of the airflow
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
An increase in the temperature difference in the boundary layer by 8 times leads to an increase in the turbulization parameter by 86.2 times
Summary
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. В качестве критерия оценки эффективности работы вентиляционного аппарата тормозного диска был предложен параметр турбулизации воздушного потока внутри исследуемого аппарата. На основании предложенного критерия оценки эффективности работы был проведен расчет аэродинамических и теплообменных характеристик объекта исследований. По результатам расчета предложена взаимосвязь конструктивных параметров сегме нтарного 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. А. Исследование сегментарного вентиляционного аппарата тормозного диска с определением взаимосвязи аэродинамических и теплообменных характеристик воздушного потока // iPolytech Journal.
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