Experimental investigation of design parameters in an impingement starting system for turboshaft engines / Deutscher Luft- und Raumfahrtkongress 2021 ; N. Kuen, L. Stecher Alonso Lillo, C. Helcig, V. Gümmer (Technical University of Munich (TUM), Department of Aerospace and Geodesy, Chair of Turbomachinery and Flight Propulsion, Garching b. München, Germany)