Abstract:

This work presents a constructivist teaching–learning experience in higher education in the field of turbomachinery. The methodology has been implemented in the course Thermal Machines of the Bachelor’s Degree in Mechanical Engineering at the Escuela Politécnica Superior de Jaén (University of Jaén, UJA) and is based on the analysis and solution of engineering problems carried out both individually and in small collaborative groups.

An educational tool based on a spreadsheet is presented for the characterization of a centrifugal turbocharger compressor. The activity is structured in several stages. First, students perform the direct observation and measurement of the compressor geometry, determining the relevant dimensions at the rotor inlet and outlet, as well as the blade angles. Students then learn to use the spreadsheet developed for this purpose to analyze the compressor by performing energy balances based on the Euler turbomachinery equations, analyzing the velocity triangles at the rotor inlet and outlet, and evaluating the corresponding thermodynamic transformations of the working fluid.

Once these competencies are acquired, the tool is applied to different engineering contexts to reinforce learning through realistic application scenarios. First, students analyze the matching of a blower with a naturally aspirated reciprocating internal combustion engine, carried out in groups of three students, which promotes collaborative learning and calculation-based decision making. Second, the spreadsheet is used for the characterization of the compressor of a laboratory microjet engine, integrating the calculations required in another practical activity of the course.

The implementation of this methodology requires active instructor–student interaction to properly guide the learning process and support the correct interpretation of results. The overall evaluation of the experience is highly positive, as students perceive strong instructor involvement during the activities, which leads to increased motivation, a better understanding of fundamental concepts, and improved academic performance.

Keywords:

Engineering Education, Active Learning, Collaborative Learning, Problem-Based Learning, Turbomachinery, Spreadsheet-Based Learning Tool.