Numerical Investigation of Rotating-Stall in a stage of an Axial Compressor with Two Different Approaches
Abstract and Figures
Rotating-Stall (RS) through a cascade of an axial compressor has been nu-merically investigated by employing an unsteady two-dimensional density based computer code. To validate the computer code, three test cases were p r epared, and the good a g r eement resulting from comparison of the results has given adequate assurance of the code. The cascade problem was studied through diierent geometric approaches, which were classiied in two main categories. The was the semi-stage (single rotor-cascade), and the second was the complete stage. For each geometric approach, the number of blades was varied f r om a minimum number to a maximum value (variable cascade length). The RS modal characteristics and its development for all geometric cases were observed. The RS was incepted with a 40% reduction in coeecient and a 0.4% increase in the load coeecient from their normal operating values. In all cases, the captured m o dal characteristics of RS varies with the variation of the cascade length to a maximum value, and this triggers the same modes of RS. The variation of the modal characteristics of the RS, in the two main geometric approaches seems to be similar, but at diierent levels.
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