Adjustable guide grill for axial compressor - involves guide blades with fixed upstream side part and pivotable downstream side part, all blade parts having different thicknesses

摘要

The thickness (df) of the profile of the fixed guide blade part (9) is greater than that (ds) of the profile of the pivotable guide blade part (10). The quotient between the thickness of the two profiles (9,1 0) is in accordance with the formula:- delta = 1 + k * (alpha max) ( - ) in which delta - df/ds thickness ratio ( - ) k = constant (k = 0.005 to 0.5) (1/deg.) alpha max = max. pivot angle in deg. The angle (delta) between the inclination of the upper and lower side on the rear edges of the fixed guide blade part (9) is approximately equal to the max. pivot angle (alpha max) of the pivotable guide blade part (10). USE/ADVANTAGE - An adjustable guide grill for an axial compressor in which even for large pivot angle ranges of the guide blades the flow losses are low.