Heat Transfer Analysis in Turbocharger Systems

Heat transfer within turbocharger systems encompasses the exchange of thermal energy between the high-temperature exhaust gases, rotating turbine and compressor blades, central bearing housing and surrounding ambient. Conductive, convective and radiative mechanisms all play roles in defining temperature distributions that influence turbine power output, compressor work input, engine volumetric efficiency and overall turbo lag. Accurate prediction of local heat transfer coefficients and fluid temperatures is essential for component life‐cycle assessment, material selection and cooling strategy design. Modelling approaches range from zero‐ and one-dimensional engine cycle simulations to three-dimensional computational fluid dynamics (CFD) coupled with finite element analysis (FEA) for transient conjugate heat transfer. Experimental techniques such as infrared thermography and embedded thermocouples are used to validate numerical models under both steady-state and transient warm-up or cool-down conditions. Advances in energy and exergy analysis have furthered understanding of irreversibilities due to non-adiabatic operation, guiding the adoption of thermal barrier coatings, turbine casing insulation and optimised coolant flow to enhance efficiency, reduce emissions and extend component durability across diverse engine platforms.

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Heat Transfer Analysis in Turbocharger Systems publication trend

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Technical terms

Conjugate heat transfer: Coupled analysis of heat movement between fluids and solid structures within a system.

Heat transfer coefficient: Quantitative measure of convective heat flux per unit area between a surface and adjacent fluid.

Infrared thermography: Non-contact method for capturing surface temperature distributions via infrared radiation.

Energy and exergy analysis: Thermodynamic evaluation of total energy flows and the fraction of usable work, respectively.

Non-adiabatic operation: Condition where heat exchange with the environment alters the behaviour and efficiency of the turbocharger.

References

1. Thermal Investigation of a Turbocharger Using IR Thermography. Clean Technologies (2022).
2. Impact of Turbocharger Non‐Adiabatic Operation on Engine Volumetric Efficiency and Turbo Lag. International Journal of Rotating Machinery (2012).
3. Uncoupled CFD-FEA Methods for the Thermo-Structural Analysis of Turbochargers †. International Journal of Turbomachinery Propulsion and Power (2019).
4. Experimental Energy and Exergy Analysis of an Automotive Turbocharger Using a Novel Power-Based Approach. Energies (2021).
5. Analysis on the Influence Mechanism of Cooling Water on Turbocharger and Optimum Coolant Mass Flow Rate Intelligent Prediction. Mathematical Problems in Engineering (2021).