Experimental Assessment of Fouling Effects in a Multistage Axial Compressor Nicola Casari, Michele Pinelli, Pier Ruggero Spina, Alessio Suman and Alessandro Vulpio E3S Web Conf., 197 (2020) 11007 Published online: 22 October 2020 DOI: 10.1051/e3sconf/202019711007