“…The impact of only one blade deviating substantially from the design intent on the flow is largely limited to the blade passages. Lots of references mainly focused on the leading edge of the compressor blades, because it is considered having the most influence on the flow field and loss (Giebmanns et al, 2012;Goodhand et al, 2015). Giebmanns et al (2012Giebmanns et al ( , 2013 optimized the leading edge profile of a fan, the efficiency increment increases about 0.5% at the peak efficiency condition.…”