A proposed aircraft lift/thrust power plant arrangement

This report contains a brief description of an aircraft power plant arrangement of the turbofan type which bas been the subject of some considerable analytical and design assessment during the past nine months and is believed to be of potential value in tbe civil STOL/VTOL aircraft application.

Pressure loss and flow distortion measurements on circular compressor intakes in inclined flow

Data relating to mean total pressure loss and flow distortion in full-scale circular intakes under cross- flow conditions are presented for a range of cowl lip profiles. Five cowl shapes were tested over a range of velocity ratio from 0 te 0.7 and at cross - flow angles from 0 to 165 degrees. Boundaries were established between the regime in...

Measured circular intake performance in inclined flow for a series of semi-circular lip profiles

Data, relating mainly to mean total pressure 1055, in inclined flow, are presented for a series of five circular intakes with common centre- body (0.5 diameter ratio) and employing semi-circular lip profiles. Lip radius to intake, radius ratios were 0 . 10, 0 . 15, 0 . 20, 0 . 25 and 0 . 30 . Measurements were made at velocity ratios up to 2 .0...

Intake flow and fan performance measurements at high thrust loadings in inclined flow

Experimental data are presented, re lating ta the operation under inclined flow conditions of a two-stage fan of high thrust loading (800 lb./sq. ft.) enclosed, in a cowled intake.The intake configurationhad been investigated previously, in the absence of the fan, over a similar range of intake velocity ratio and cross-flow angle (Ref. 1). The...

Experimental investigation of slotted engine intakes in the upper surface of a thick wing

The effects of flow rates appropriate to engine requirements through slotted intakes in the rear upper surface of a thick wing were investigated. The basic test configuration incorporated a 31.5 percent thick aerofoil of 3-ft chord and 4-ft span. The aerofoil was equipped with a wide (5 percent chord), fun span intake slot, located at 65 percent...

Circulation control by slot suction on a circular cylinder preliminary measured force data

Observations of tunnel flow separation induced by an impinging jet

Single jets were directed towards, and perpendicular to, the boundary of the 10-ft x 20-ft test section of the NRC V/STOL Propulsion Tunnel. The position of tunnel flow separation, arising from jet impingement and forward penetration, was determined from wool tuft observations for various conditions of jet geometry, jet velocity, and tunnel...

Circulation control by slot suction on a circular cylinder: measured force characteristics of a smooth double-slotted cylinder

Balance measured thrust performance of various cowled axial fan configurations in a mainstream at 90º incidence

Balance measured force data are presented for a series of thrusting fan configurations (tip dia. 15") operated in cross-flow, at 900 incidence, in the 10 ft. x 20 ft. N.R.C. V/STOL Propulsion Tunnel. Test conditions involved tunnel speeds from 30 to 130 ft.jsec. in combination with mean intake velocities from 100 to 400 ft./sec. The force data...

Tunnel flow breakdown from inclined jets

Inclined single and paired jets were operated through the regime of floor vortex formation in the NRC 10-ft x 20-ft V/STOL propulsion tunnel. Observed floor stagnation positions are correlated in terms of a jet force coefficient. Limiting conditions for vortex formation (incipient stagnation) are derived for a wide range of jet inclination to...

Conical diffusers with inflow distortion: Estimated peak local velocity at exit

A simple analytical expression relating exit and entry distortion factor. VMAX/VMEAN' for a conical-type diffuser is derived. The expression involves two assigned constants, values for which are obtained from a quantitative fit of measured data for a series of six conical diffuser configurations. operated with cross-flow generated inflow...

A compact form of thrust deflector: System considerations and model tests

A compact form of thrust deflector, of possible application to existing turbofans, is described. The use of the deflector in various roles is discussed. The basic design allows, in principle, continuous variation of deflection from zero to design maximum with no effect on upstream flow conditions. In addition no upstream flow distortion should...

Confined mixing of coaxial flows

An empirical approach is used to correlate the mixing of isothermal incompressible coaxial air flows in straight pip es of constant circular cross-section. An assumed decay function for kinetic momentum is correlated in terms of initial geometry and initial velocities of the mixing streams. The method allows the rapid estimation of quantities of...