No abstract

It has always been important to study the development and improvement of the design of turbomachines, owing to the numerous uses of turbomachines and their high energy consumption. Accordingly, optimizing turbomachine performance is crucial for sustainable development. The design of impellers significantly affects the performance of centrifugal compressors. Numerous models and design methods proposed for this subject area, however, old and based on the 1D scheme. The present article developed a hybrid optimization model based on genetic algorithms (GA) and a 3D simulation of compressors to examine the certain parameters such as blade angle at leading and trailing edges and the starting point of splitter blades. New impeller design is proposed to optimize the base compressor. The contribution of this paper includes the automatic creation of generations for achieving the optimal design and designing splitter blades using a novel method. The present study concludes with presenting a new, more efficient, and stable design.

In modern manufacturing and assemblies, high-dimensional accuracy and fine surface finishing play an important role. One of the most promising methods of fabricating such high-precision parts is magnetorheological finishing process. In cylindrical components grinding, the external surface is ground and by obtaining a high-precision finished surface these components will perform better in mechanical systems. This process is not readily applicable to magnetizable materials, if a high-magnetic field is used. This is due to the attraction of workpiece by magnetic force and preventing it to rotate. In this study, the main mechanism is responsible for the decrease of Ra on external surface of cylindrical workpieces made of non-magnetizable materials, and a new method based on MRF process is examined. The examined specimens in this study are made of aluminum (Al), it is known as a kind of non-magnetizable, soft, and lightweight materials. The apparatus that used for this experiment includes two main motions. The first one is using a rectilinear alternating motion to improve processing conditions, and the second one is specimen's rotational motion. The experiments of this study show the applicability of this method for finishing cylindrical surfaces made of Al.

No abstract