Wave height-based water jet propulsion ship wake evaluation method

The invention belongs to the field of ship water power, and discloses a water jet propulsion ship wake evaluation method based on wave height. Comprising the following steps: 1) measuring the wave height of a stern wake field to obtain the time-domain wave height; 2) converting the time-domain wave height into the frequency-domain wave height by adopting a fast Fourier transform formula to obtain wake wave height spectral characteristics; 3) calculating the characteristic frequency f1 (Hz) of the wake of the ship body, wherein f1 = V0/L; (4) the jet flow frequency f2 (Hz) is calculated, wherein f2 = Vj/Dj; (5) extracting a wave height amplitude delta h1i (m) in a frequency band range of 0.9 f1-1.1 f1 and a reference water head # imgabs0 # of f1; (6) extracting a wave height amplitude delta h2i (m) in a frequency band range of 0.9 f2-1.1 f2 and a reference water head # imgabs1 # of f2; (7) calculating a dimensionless pressure coefficient Ch, # imgabs2 #, evaluating the size of the jet wake field through the di