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restrictions, units, nomenclature, and sign conventions, it was not uncommon to stumble upon errors and abuse of theory. Most of the correlations utilized graphs in order to demonstrate relationships between variables. The data from each of these graphs was converted to either a curve fit or a series of curve fits. Linear interpolation was used as necessary when data fell between two data points. Bloch (1996) created an off-design shock loss model for a linear 2-D cascade which uses the cascade geometry profiles for the suction and pressure sides of the blade, the solidity (σ), and the LER and TER. The only flow condition required for input was the relative inlet Mach number (Mr1). The Bloch model was created in the C programming language, and in addition to the main theory, contained methods of grid generation and convergence. Therefore, it was decided not to recode the Bloch model in FORTRAN but to modify its existing code to accept different inputs. The Bloch program could then be used as an external program that could be called on from the FORTRAN- based CMLC. The FORTRAN subroutine Bloch utilizes its RUNQQ command which calls the executable and contains the necessary inputs such as the names and locations of the geometry input files as well as the relative inlet Mach number (Mr1). After the Bloch program was executed and had written its results to a file, the results were gathered in the FORTRAN subroutine and the useful data was saved. One major problem existed in the implementation of the Bloch model in that it demonstrated that a 2-D cascade chokes at a unique incidence, also called the minimum- loss incidence, implying that the loss versus incidence curve becomes vertical. This phenomenon was not demonstrated from the experimental data for the 3-D annular cascade Rotor 1-B. The Rotor 1-B experimental data illustrated that at incidences less than that of minimum-loss the loss versus incidence curve was not vertical. In order to 26PDF Image | Gas Turbine Design Axial Flow Compressors
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