MINISTRY OF AVIATION AERONAUTICAL RESEARCli COUNCIL CURRENT PAPERS The Low Speed Performance of Low Stagger Compressor Blading at Three Pitch/Chord Ratios

The low speed perfommlce of low stagger compressor bl&i.ng at three pitcbdchord ratlios-by-Two stages of low qeed, low stagger blading were tested &t man diameter pitc$/chord ratios of 0.43, 0.66 and C.34. Contmry to the indications of some earlier published work, t'nere was no si@ficant Pall-off in elYiciency at the lowest, pitching, and the trend of the performance was in line with that predicted by simple theory. These remits lm.ve 3. considerable 'be~iq on the coqression of light gases, where low pitch/chord ratio s :~e needed to produce high stage temperature rises, in order to kc:ep the r~nber of stooges reasonably smai_l.