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The design of the cascade hardware and baseline airfoils was previously reported. The test results of baseline airfoil performance in the annular cascade and the status of the other tasks are presented in this report.

A comprehensive three-year program is in progress to investigate methods of improving the performance of fan-drive turbines. The goals of the program are to develop turbine aerodynamic techniques and design procedures for efficient, high work, low pressure turbines by means of analytical studies and cascade testing, and to demonstrate the effectiveness of the techniques by designing and testing a two-stage turbine that meets or exceeds the contract stage work and efficiency goals. The first phase effort defining the preliminary turbine design has been completed and the results have been reported. The second phase consists of a preliminary experimental evaluation which includes establishment of two-dimensional loss levels and three- dimensional flow behavior for both the baseline airfoils and airfoils utilizing boundary layer control devices. The design of the rig hardware and the baseline airfoils which will be evaluated during this second phase are presented in this report. (Author)

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.

A three-year program was initiated to provide a direct attack on the problem of attaining high efficiency in highly loaded turbine stages. The goals of this program are to develop turbine aerodynamic techniques and design procedures for efficient, high work, low pressure turbines by means of analytical studies and cascade testing, and to demonstrate the effectiveness of the techniques and procedures by designing and testing a two stage turbine that meets or exceeds the contract stage work and efficiency goals. The first phase effort described in this report was directed toward defining a turbine design with the highest inherent resistance to boundary layer separation and to select boundary layer control techniques that are best suited for extending the loading limits of the basic turbine design. (Author)