ABSTRACT
The analytical and experimental study on thermal and flow field of a VG (Variable Geometry) turbocharger has been conducted for attaining the high reliability thermal and structural design. CHT (Conjugate Heat Transfer) calculations, working for simulating heat transfer with mutual dependence between solid structures and fluid, are applied to the VG turbocharger. The computational domain includes the turbine section, the variable nozzle vane structure and the bearing housing to acquire the whole of thermal and flow field accurately. The thermal modelling around the variable nozzle vane structure has been developed.
In addition, the gas stand test demonstrated the VG turbocharger under high temperature condition to validate CHT calculations. Analytical results are evaluated against experimental data. Eventually, the proposed analytical method has been proved to have the advantage of thermal and structural design. The performance degradation induced by thermal energy loss is also discussed.
