“…Early research efforts aimed at introducing pressure exchangers of straight channel profiles as a means to enhance gas turbine cycles [3,4,12] and internal combustion engines [6,7,13,14]. More recent studies further pursue gas turbine [15][16][17][18] and reciprocating engine [14,19,[19][20][21][22] enhancement. In addition, the field of applications has been extended through the application of wave rotors in refrigeration cycles [8,9,[23][24][25][26] and pressure-gain combustors [1,2,[27][28][29][30][31][32][33].…”