A prediction method for convective heat transfer coefficients of brake discs based on small samples combined wind tunnel tests and CFD simulations

The brake disc is a crucial component of an automobile's disc brake system, responsible for dissipating the majority of heat generated during braking. Efficient heat dissipation is essential for effective braking, and it relies on the convective heat transfer coefficient of the brake disc. However, accurately measuring this coefficient is challenging due to continuously changing flow fields caused by vehicle speed and rotation. Existing methods often lack precision, neglect the influence of position and involve complex computations. To address these issues, this study establishes a relationship between the convective heat transfer coefficient at different heights and flow velocity using high-precision small samples and wind tunnel tests. Through interpolation based on the FLUENT software's simulation of the brake disc's flow field distribution, the convective heat transfer coefficient distribution is obtained. This allows the prediction of coefficient values corresponding to different flow velocities. Validated through comparison with experimental data using an ABAQUS model, the proposed method effectively predicts the brake disc's convective heat transfer coefficient, enabling accurate analysis of cooling and temperature reduction processes.