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This paper experimentally examines the influence of hybrid excitation on the performance
of vibrational piezoelectric energy harvesting systems on a bluff body with a variable cross section
along its generatrix. A combination of vibrational excitation from a shaker and airflow is considered
the source from which energy is harvested. Varied excitation frequencies and airflow velocities across
five different masses were considered, each defining the natural frequency of the system. The system’s
performance in hybrid excitation, enhancements in energy harvesting, and challenges with these
was observed, helping to determine optimal operating conditions to function effectively in ambient
environments. The tests identified the conditions and ranges within which maximized harvesting
responses were observed. Next, computational fluid dynamic (CFD) simulations were carried out
to understand the impact of circular and square cross sections controlling the nature of the airflow
and representative of the wide range of cross sections that may be utilized for such purposes. The
analyses helped contextualize the opportunities and limitations of the use of such cross sections and
helped in understanding if a transition from one cross section to another can lead to an assimilation
of the advantages observed in using each cross section independently.