Design and analysis of Air flow duct for improving the thermal performance of disc brake rotor (original) (raw)
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ANALYSIS OF VENTILATED DISC BRAKE ROTOR USING CFD TO IMPROVE ITS THERMAL PERFORMANCE
The objective of the project is to improve the thermal performance of brake discs of RACE car and study of fluid flow characteristic feature around the disc brake. The verification will be done through the numerical simulations by correlating with Test data available for existing-design and the, heat transfer rate and air flow rate of the discs are predicted. The numerical analysis of disc brake is done in order to study following parameters 1) Rate of heat dissipation for the rotor surfaces. 2) Mass flow rate through the rotor passage. 3) Temperature uniformity on all the rotor surfaces. 4) Detailed aerodynamics of the air flow through the passage. Heat and Mass transfer mode: 3 The project is further divided into three steps; the model creation, mesh generation and CFD simulation. Post processing is performed after the simulations reach a specified error residual value. These are explained in the following sections in detail.
In recent years a trend towards faster vehicles with powerful engines has developed. Heavy braking force & high retardation leads to high temperature at disc brake. An upper limit on the temperature of the brake assembly is dictated by certain material properties. Hence heat energy has to be disposed of more efficiently. Possibilities of increasing conduction and radiation are restrained by material properties and temperature limits. Therefore the focus is on convection. Different ventilated disc brake rotors are analyzed with CFD and the most optimum ventilated disc rotor is found for automobile industry. Various disc brake designs are used to describe a method for calculating temperatures of disc brakes. For the calculations a CFD code is employed that determines distributions of local temperatures in the flow field as well as on the disc brake rotor. In a ventilated disc brake rotor air must be circulated through the rotor to provide adequate cooling. The passages formed by the radial vanes between the braking surfaces, act as a centrifugal fan, facilitating the required air flow for cooling. To improve the performance of a ventilated disc brake rotor, radial vanes are modified and analysis is done for the same. After the CFD analysis the experimental verification is done with actual experimental setup. The CFD results are verified with the experimental results obtained on test rig.
Experimental & Analytical Investigation for Optimization of Disc Brake Heat Dissipation Using CFD
Evergreen
One of a vehicle's most crucial duties is braking. It is critical to design the braking system so that the automobile is still safe when braking. When the brakes are applied, the disc brakes dissipate a heat. The heat dissipation of the brake determines the braking system safety. The present investigation has been intended to estimate the heat dissipation rate of the disc brake; for different proposed disc brake structures using CFD and thermal analysis. The thermal stress has been computed at different load, speed and temperature. The outcome provides essential knowledge of the behavior of the disc airflow, which is critical for comprehending the entire airflow. Both local and global correlations could be established using different visualization techniques. It enables to understand the disc brake thermal stability. The temperature at the interface between pad and disc varies from 36.45°C to 97.8°C as the speed varies from 300 rpm to 1100 rpm and load from 20 N to 80 N. The steady state thermal analysis of a disc rotor was performed in order to evaluate the braking performance of a disc brake under braking conditions. Modelling software has been used to design the brake rotor, and CFD is used to analyse it. It can be reported that numerical, CFD & experimental analysis carried out on the proposed new disc brake design demonstrated optimized heat dissipation.
CFD Analysis of Automotive Ventilated Disc Brake Rotor
Disc brakes work on the principle of friction by converting kinetic energy into heat energy. The key objective of a disc brake rotor is to accumulate this heat energy and dissipate it immediately. The effect of rotational speed on the aero-thermal performance is assessed. The rotor speed is observed to have substantial effect on the rotor performance. The heat dissipation and thermal performance of ventilated brake discs intensely be influenced by the aerodynamic characteristics of the air flow through the rotor passages. In order to investigate the aerothermal performance of the ventilated disc brake at several altered driving speeds of the vehicle, the simulations were carried out at 3 different rotational speeds of 44rad/s 88 rad/s and 120 rad/s. The semi-automatic geometric model is created using the package Solid Works and the mesh for the model is done using ICEM CFD and the Post processing of the results is done using FLUENT-14.5.The results are discussed and presented in detail.
Experimental & Analytical Investigation for Optimization of Disc Brake Heat Dissipation Using CFD
Evergreen, 2022
One of a vehicle's most crucial duties is braking. It is critical to design the braking system so that the automobile is still safe when braking. When the brakes are applied, the disc brakes dissipate a heat. The heat dissipation of the brake determines the braking system safety. The present investigation has been intended to estimate the heat dissipation rate of the disc brake; for different proposed disc brake structures using CFD and thermal analysis. The thermal stress has been computed at different load, speed and temperature. The outcome provides essential knowledge of the behavior of the disc airflow, which is critical for comprehending the entire airflow. Both local and global correlations could be established using different visualization techniques. It enables to understand the disc brake thermal stability. The temperature at the interface between pad and disc varies from 36.45°C to 97.8°C as the speed varies from 300 rpm to 1100 rpm and load from 20 N to 80 N. The steady state thermal analysis of a disc rotor was performed in order to evaluate the braking performance of a disc brake under braking conditions. Modelling software has been used to design the brake rotor, and CFD is used to analyse it. It can be reported that numerical, CFD & experimental analysis carried out on the proposed new disc brake design demonstrated optimized heat dissipation.
DESIGN AND CFD ANALYSIS OF BRAKE DISC
International Journal of Management, Technology And Engineering, 2019
The importance of convective cooling of a brake disc is an important factor since it can be significantly improved by trivial design changes and contributes to the major part of the total dissipated heat flux for normal driving conditions. At first, experimental aero-thermal flow test of ventilated brake discs were performed in the Volvo brake machine and the Volvo wind tunnel. These tests were further correlated with a CFD modeling method in order to provide reliability and trust to the model itself. The developed CFD model was then applied into a full vehicle model of a mid-size Volvo to predict and analyze the aero-thermal flow behavior of a ventilated brake disc in the wheel house. It can be seen that the vanes contributes to the major dissipated convective heat from the brake disc and the wheel house through-flow is of great importance for the cooling behavior. Because of the complexity of the wheel house flow, trivial design changes could alteration the aero-thermal flow behavior of the brake disc. An even more comprehensive study could be obtained by applying a full thermal which predicts the aero-thermal flow dependency of convection, conduction and radiation.
Review Paper on Thermal Analysis of Ventilated Disc Brake by Varying Design Parameters
International journal of engineering research and technology, 2013
Safety aspect in automotive engineering has been considered as a number one priority in development of new vehicle. Brakes convert friction to heat, but if the brakes get too hot, they will cease to work because they cannot dissipate enough heat. Ventilated disc brake is the state of the art technology in automobile brake system .In this study FEA approach has been conducted in order to identify the temperature distributions and behavior of disc brake rotor in transient state. This paper reviews work of previous investigators on transient thermal analysis on the vented disk rotor and rotor designs to evaluate and compare their performance. Time varying temperature load is applied on the rotors and the temperature distribution was analyzed considering cooling parameters (convection and radiation). The main of aim of this review work is to study various researches done in past to improve heat transfer rate of disc brake (ventilated) by changing vane geometry and material.
IJERT-Review Paper on Thermal Analysis of Ventilated Disc Brake by Varying Design Parameters
International Journal of Engineering Research and Technology (IJERT), 2013
https://www.ijert.org/review-paper-on-thermal-analysis-of-ventilated-disc-brake-by-varying-design-parameters https://www.ijert.org/research/review-paper-on-thermal-analysis-of-ventilated-disc-brake-by-varying-design-parameters-IJERTV2IS120586.pdf Safety aspect in automotive engineering has been considered as a number one priority in development of new vehicle. Brakes convert friction to heat, but if the brakes get too hot, they will cease to work because they cannot dissipate enough heat. Ventilated disc brake is the state of the art technology in automobile brake system .In this study FEA approach has been conducted in order to identify the temperature distributions and behavior of disc brake rotor in transient state. This paper reviews work of previous investigators on transient thermal analysis on the vented disk rotor and rotor designs to evaluate and compare their performance. Time varying temperature load is applied on the rotors and the temperature distribution was analyzed considering cooling parameters (convection and radiation). The main of aim of this review work is to study various researches done in past to improve heat transfer rate of disc brake (ventilated) by changing vane geometry and material.
Revista Científica
Braking system is one of the basic organs to control a car. For many years, the disc brakes have been used in automobiles for safe retardation of the vehicles. During braking, enormous amount of heat will be generated, and for effective braking, sufficient heat dissipation is essential. The specific air flow surrounding the brake rotor depends on the thermal performance of the disc brake and hence, the aerodynamics is an important in the region of brake components. A CFD analysis is carried out on the braking system as the study of this case, to make out the behaviour of air flow distribution around the disc brake components using ANSYS CFX software. The main object of this work is to calculate the heat transfer coefficient (h) of the full and ventilated brake discs as a function of time using the CDF analysis which will be used later in the transient thermal analysis of the disc in ANSYS Workbench 11.0.