An automated tool for the design of arbitrary volute geometries is presented in this paper. The shape of the volute geometry is represented by B-splines as a function of the azimuth angle ϕ. Furthermore, the volute and exit cross section areas can be specified as well as the fillet radius.
A volute-only model is used to investigate the influence of the fillet radius and the volute exit area onto the volute performance. Based on the analysis of one hundred randomly generated geometries, a surrogate model is created using the static pressure recovery and the total pressure loss coefficient. This model shows, that there is a large dependency between the exit area and the efficiency of the volute. In contrast, the fillet radius had only minor influence.