TRANSPAR

In order to increase the efficiency and optimize the operation of thermal engines, the study and control of parietal heat exchanges are essential at various levels (combustion chamber, intake and exhaust lines, exchangers, etc.). In this thesis, parietal exchanges are characterized by experimental and modeling approaches. At LHEEA (Ecole Centrale Nantes), measurements are carried out on a supercharged air cooler of an internal combustion engine. At LAMIH, the aim is to develop measurements on a dedicated mock-up (reciprocating machine coupled to a tube) with state-of-the-art metrology (micro-thermocouples, pyrometer, etc.). In addition, these measurements will be compared with CFD calculations and 0D models to highlight the dynamic aspect of the physical phenomena. A further challenge is to carry out transient measurements, which will highlight the correlation between temporal variations in parietal flow and variations in velocity. Parietal exchanges will thus be fully characterized and modeled by the two laboratories' complementary approaches for heat engine applications in order to optimize their energy efficiency.