Preliminary evaluation of real gas effects in a gasdynamic nozzle

Davide Brambilla (Politecnico di Milano)

The present work proposes a methodology can be ultimately applied to the design of turbine blades. Such an approach couples fluid-dynamic analysis with a Genetic Algorithm for the optimization. In particular, the thesis' aim is to optimize the shape of a two dimensional converging-diverging nozzle for an organic compound to achieve given outflow conditions. Moreover, different levels of approximation are evaluated: ideal- and real-gas laws for the thermodynamics, while inviscid and viscous flows for the fluid-dynamics. In the end, such problem resembles a turbine expansion and has an immediate application to a wind tunnel for organic fluids currently under construction at the Politecnico di Milano.







The software modeFRONTIER has implemented a discrete variety of models, ranging from simpler polynomial approximations to more advanced models. Excluding from the analysis the simpler and more inaccurate methods together with those requiring a very large training set. The total conversion efficiency of energy conversion systems is dependent on the eciency of its components. This thesis tests a methodology for the fluid dynamic design of turbomachinery components for Organic Rankine Cycles in order to improve their overall efficiency.