Thermal and fluid-dynamic analysis of an automotive disc brake with ventilation pillars aerodynamic type

Abstract

The braking system of a car must work safely and predictably in any circumstance, which implies having a stable level of friction, in any condition of temperature, humidity and salinity of the environment. For a correct design and operation of the brake discs, it is necessary to consider different aspects, such as the geometry, the type of material, the mechanical resistance, the maximum temperature, the thermal deformation, the cracking resistance, among others. The objective of this study was to analyze the behavior of temperature, velocity and heat flow, in the ventilation duct of an automotive disc brake with ventilation pillars different from conventional using computational fluid dynamics. The SolidWorks Simulations design software was used to analyze the behavior of the fluid (air) in terms of speed and heat dissipation capacity. The numerical results for the heat flow through the ventilation channels were compared with the results obtained mathematically. The numerical results showed that the discs performed well under severe operating conditions. In the design of the brake disc is very important to select the appropriate geometry, particularly the number and the cross section of the ducts in addition to that, the type of material. Numerical methods offer advantages through the software tools for selecting geometry and material and for modeling fluid flow to optimize heat dissipation to provide maximum performance for properly maintained components.

Mechanical and Dynamic Maps of Disc Brakes under Different Operating Conditions

“…On the other hand, García-León et al [13] proposed a new geometric arrangement to improve airflow in a common vehicular disc brake, considering the ventilation blades based on NACA 66-209 type aerodynamic profiles; this purpose was used particle image velocimetry (PIV) technique. The results indicate that a configuration of 20 blades improves heat dissipation [14,15]. A similar study proposes a new geometric arrangement to enhance the airflow in a vehicular disc brake, considering the ventilation pillars based on N-38 type aerodynamic profiles.…”

Numerical Study of Heat Transfer and Speed Air Flow on Performance of an Auto-Ventilated Disc Brake

“…Numerical tests were performed with three different quantities of ventilation blades, which were 10, 15, and 20. They proved that a configuration of 20 blades improves heat dissipation [23,24]. A similar study proposed a new geometric arrangement to enhance the airflow in a vehicular disc brake, considering the ventilation pillars based on N-38 type aerodynamic profiles.…”