Parametric Analysis of the Boundary Layer of the Air Flow of the Ventilation Duct of the Brake Disc

Litvinov, A. E.; Yaitskov, Ivan; Polyakov, P. A.; Golikov, A. A.; Fedotov, Evgeny; Zadayanchuk, Nina

doi:10.1007/978-3-030-85057-9_41

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“…Analytical dependences (8), (9), obtained for the temperature distribution in the boundary layer of the blowing air flow, make it possible to develop a thermal model of a ventilated brake disc in Figure 5. According to the Reynolds analogy, the process of heat transfer in the boundary layer, as well as the process of aerodynamic resistance, depends on the longitudinal velocity of the air flow in the ventilation channel of the brake disc.…”

Section: Resultsmentioning

confidence: 99%

“…From the analysis of special literary sources, it can be concluded that the connection between the air flow regime and heat transfer from the heated surfaces of the brake mechanism to the external condition was previously considered as a homogeneous system. Nevertheless, studies [8,9] show that the boundary layer near different surfaces of the brake disc in the turbulent flow regime in Figure 1 has different properties and calculation methods. Accordingly, the turbulent boundary layer has three sub layers: first is a viscous sub layer, second is a transition field and third is a field of completely turbulent flow.…”

Section: Introductionmentioning

confidence: 99%

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The connection between air flow regime and heat transfer in the boundary layer of the brake disc cooling unit

et al. 2023

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The boundary layer of the air flow blowing the surfaces of the brake mechanism prevents heat transfer from heated surfaces. The obtained analytical dependences of the velocities` and temperatures` distribution in the boundary layer represent the field of the boundary layer as a multilayer structural model, the laws of change in the velocities and temperatures of the air flow blowing depend on various sub layers of the boundary layer. According to these analytical dependencies, a thermal model “ventilated brake disc - external condition” was developed. The thicknesses of the boundary layers of the air flow blowing on the various surfaces of the brake disc are determined by various processes. For the working surfaces of the brake disc, the determining criterion is the thickness of the diffusion layer, while for the surfaces of the ventilation apparatus, the criterion for estimating the thickness of the boundary layer is thermal processes. In future, the developed thermal model “ventilated brake disc – external condition” should be the basis for thermal calculations in designing disc-shoe type brake mechanisms.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%