Investigation of a Highly Loaded Two-Stage Fan-Drive Turbine. Volume IV. Phase II. End Wall Boundary Layer Control Evaluation

A comprehensive, four-phase, three-year program is in progress to investigate methods of improving the performance of fan-drive turbines. The goals of this program are to develop turbine design procedures and aerodynamic techniques for high work, efficient, low-pressure turbines. The first phase effort of defining the preliminary turbine design has been completed and the results were reported. The second phase consists of an experimental evaluation which includes establishment of both two-dimensional loss levels and three-dimensional flow behavior for the baseline airfoils and for airfoil utilizing various boundary layer control methods. The design of the baseline cascade packs and the three-dimensional performance of the baseline airfoils were reported. The test results of the baseline airfoil boundary layer control methods and the performance of the decreased solidity annular cascades are presented in this report.