摘要：

These experiments are devoted to the investigation of initial nonlinear stages of laminar–turbulent transition in a self-similar boundary layer with an adverse pressure gradient (APG) at Hartree parameter β _H  = −0.115. The measurements are performed at controlled disturbance conditions at very large variation of initial spectra of excited 3D (in general) Tollmien–Schlichting (TS) waves. The results are presented in three papers: part 1 (Borodulin V I, Kachanov Y S and Koptsev D B 2002 J. Turbulence 3 062), part 2 (Borodulin V I, Kachanov Y S, Koptsev D B and Roschektayev A P 2002 J. Turbulence 3 063), and part 3 (this paper). The experimental procedure, the basic flow characteristics, the disturbance generator, all regimes of measurements, and the results obtained in the cases of tuned resonant interactions of TS waves are presented in part 1. The investigation of resonant interactions in the presence of frequency and spanwise-wavenumber detunings of quasi-subharmonic modes is presented in part 2.

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