EVALUATION OF TRANSITION IN-FLIGHT TESTS USING NONLINEAR PARABOLIZED STABILITY EQUATION ANALYSIS

The VFW 614/ATTAS flight tests have provided an extensive database for the analysis and development of methods to predict transition for aer odynamic design. While previous work has rested on the e(N) method, we re-evaluate two Tollmien-Schlichting-dominated test cases using the l inear and nonlinear parabolized stability equations (PSE), We compare results obtained by standard, linear local stability theory with resul ts obtained by linear PSE, investigate possible transition mechanisms for the two test cases, and perform parametric studies to estimate the initial amplitudes to start the PSE calculations.