EFFECTS OF TWO SPINNER SHAPES ON THE PRESSURE RECOVERY IN AN NACA 1-SERIES D-TYPE COWL BEHIND A THREE-BLADE PROPELLER AT MACH NUMBERS UP TO 0.80

摘要

An investigation has been conducted to determine the effects of two spinner shapes on the pressure recovery in an NACA 1-series D-type cowl behind a three-blade propeller with fairly thick shanks. The spinner shapes considered were an NACA 1-series spinner and a spinner more nearly conical than the 1-series spinner. Platform-type junctures were used between the propeller and the spinner. Ram-recovery ratio was measured at the cowl inlet with the propeller removed and with the propeller operating. Data were obtained at Mach numbers from 0.20 to 0.80, at inlet Velocity ratios from 0.29 to 1.37, and at a Reynolds number of 1.17 million based on the maximum diameter of the cowl. The propeller was operated at various advance ratios for blade angles from 33° to 58.5°.