“…Based on the understanding of the trailing edge flap noise mechanism, the passive and active flow control techniques have been used to reduce the trailing edge noise. Active flow control methods have been proved to be capable of reducing noise, such as flow suction (Arnold et al , 2018; Lutz et al , 2014; Szőke et al , 2020), blowing jet (Anders et al , 2004; Koop et al , 2004), plasma actuator (Al-Sadawi et al , 2019; Silva et al , 2020) and a combination of these techniques (Liu et al , 2020; Zhang et al , 2018; Zhu et al , 2019). Several passive methods have been developed to reduce trailing edge flap noise, such as trailing edge serrations (Chong and Joseph, 2013; Sandberg and Jones, 2011; Wang et al , 2017), trailing edge brushes or flatlets (Finez et al , 2010; Herr and Dobrzynski, 2005; Talboys et al , 2019), porous Te (Ali et al , 2020; Ananthan et al , 2020; Carpio et al , 2019) and surface treatment (Afshari et al , 2017; Afshari et al , 2019).…”