The approach consists of comparing inlet operating requirements with estimated inlet separation characteristics to identify the most critical inlet operating condition. This critical condition is taken to be the design point and is defined by the values of inlet mass flow, free stream velocity, and inlet angle of attack. Optimum flow distributions on the inlet surface are determined to be a high, flat top Mach number distribution on the inlet lip to turn the flow quickly into the inlet and a low, flat bottom skin friction distribution on the diffuser wall to diffuse the flow rapidly and efficiently to the velocity required at the fan face. These optimum distributions are then modified to achieve other desirable flow characteristics. Example applications are given. Extension of the method is suggested.

ISpace-radiator materials and fin-tube geometry have a l a r g e influence / w i on t h e ultimate size and weight of the r a d i a t o r . Many f a c t o r s , i n t u r n , influence t h e requirements f o r materials and geometry, such as meteoroid damage protection, s t r u c t u r a l i n t e g r i t y , vehicle integration, and f l u i d compatibility. geometries that can be considered. It appears t h a t a completely satisf a c t o r y s o l u t i o n of t h e materials-geometry question f o r advanced Rankine Similarly, t h e r e i s a wide v a r i e t y of materials and power systems i s not yet i n hand.

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This paper presents a summary of principal results obtained from crossflow tests of a model 15-in.-diam lift fan installed in a wing in the NASA Lewis Research Center, 9 X 15 ft V/STOL Propulsion Wind Tunnel. Tests were run with and without exit louvers over a range of tunnel air speeds, fan speeds, and wing angle of attack. Fan thrust in crossflow was influenced by two principal factors: the effects of inflow distortion on blade-row performance; and changes in fan stage operating point brought about by changes in back pressure ratio. In this particular fan, flow separation on the inlet bellmouth did not appear to be a serious problem for crossflow operation.