Efficient Multi-Objective CFD-Based Optimization Method for a Scroll Distributor

Abstract

An efficient approach to the geometry optimization problem of a non-axisymmetric flow channel is discussed. The method combines geometrical transformation with a computational fluid dynamics solver, a multi-objective genetic algorithm, and a response surface. This approach, through geometrical modifications and simplifications allows transforming a non-axisymmetric problem into the axisymmetric one in some specific devices i.e., a scroll distributor or a volute. It results in a significant decrease in the problem size, as only the flow in a quasi-2D section of the channel is solved. A significantly broader design space is covered in a much shorter time than in the standard method, and the optimization of large flow problems is feasible with desktop-class computers. One computational point is obtained approximately eight times faster than in full geometry computations. The method was applied to a scroll distributor. For the case under analysis, it was possible to increase flow uniformity, eradicate separation zones, and increase the overall efficiency, which was followed by energy savings of 16% for the scroll. The results indicate that this method can be successfully applied for the optimization of similar problems.

Investigation of Thermal-Flow Characteristics of Pipes with Helical Micro-Fins of Variable Height

“…Generally, instead of a full, long pipe, a repeating and periodic fragment of it, representative of the entire channel and reflecting the same heat-flow phenomena, was used for the calculations. This approach to the problem is correct, and it is commonly used in the numerical analysis [25,26], as long as the resulting flow is fully developed, both hydraulically and thermally. It is known that under normal conditions, a fully developed flow can be obtained only on a pipe length equal to approximately 40-50 diameters from its inlet.…”

Modelling, Analysis and Entropy Generation Minimization of Al2O3-Ethylene Glycol Nanofluid Convective Flow inside a Tube

“…Furthermore, they added that compared to pure HFE7000 flowing in a no-slip pipe with a slip length of 100 m and a 6% volume concentration of Al 2 O 3 dispersed in HFE7000, total entropy generation was reduced by about 20% when using a slipping wall pipe with a slip length of 100 m and a 6% volume concentration of Al 2 O 3 . Other important studies on entropy generation can be found in the literature [28][29][30][31][32][33][34].…”