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aerodynamic Aft-Fan airfoil angle of attack approximately AXIAL COMPRESSOR axis blade airload blade chord blade length blade pitch blade rows components compressor noise configuration DImr duct effects engine equations 50 fan noise fan stage field point flow velocity force fluctuations Fourier frequency Gutin Helicopter Rotor in-plane forces increase Increment inflow angle inlet guide vanes kV/mB lift coefficient lift force loading harmonics Lowson ref mB-kV mBM cos 9 mBM sin 9 mean blade mean rotor swirl modal order noise radiation nondimensional number of blades number of inlet number of rotor NUMBER OF STATOR phase potential flow prediction radiation pattern reduces rotational Mach number rotor and stator rotor blades row separation row spacing shows sideways radiation sound power sound power level sound pressure level stator blades stator vanes swirl velocity theoretical results theory thrust and in-plane tip speed torque total pressure rise variations