<p>The purpose of the present study is to evaluate the response behavior of a gas turbine cycle topped with a wave rotor to an imposed pressure fluctuations. A numerical program is developed to simulate a wave rotor flow field using simplified governing equations in one dimension. The channel length and the ports timings are computed by some trials and errors considering the required combined cycle properties. Imposing pressure fluctuations on the inlet ports, the response behavior of discrete wave rotor is investigated, which shows amplifying behavior in low frequencies. It is also concluded that if the channel length and all timings are scaled alike, the wave rotor characteristic properties remain constant. In addition, the ratio of imposed fluctuation frequency to the wave rotor frequency is appropriate parameter for response analysis of wave rotors. The response of the topped gas turbine cycle to the compressor exit pressure fluctuations is also investigated by combining the wave rotor simulation and cycle analysis procedure, which reveals some resonance frequency ratios that considerably amplifies the imposed disturbances.</p>