Static internal performance of a single-engine nonaxisymmetric-nozzle vaned-thrust-reverser design with thrust modulation capabilities

Original publisher: [Washington, D.C.] : National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1985. OCLC Number: (OCoLC)631695904 Excerpt: ... orifices represented by circle symbols indicate that Port tab. The effect of the port tab ( see fig. 2 ( d ) ) total pressure is being measured. The only other gen-on thrust ratio and reverser static pressures is pre-eral trend that can be noted is that when the slider sented in figures 18 and 19, respectively. As seen in door is closed and the exhaust flow passes between figure 18, removal of the reverser port tab had little the outboard wall of the reverser port and the inner or no effect on thrust ratio for values of NPR < 3.0. door, pressures measured by the remaining orifices However, for NPR > 3.0, reverse-thrust performance were generally lower than for any other slider door was significantly higher ( more negative ) for the con-position. It is obvious that the flow is being accel-figuration with the port tab removed. crated in the outboard portion of the reverser port Reasons for this higher performance can best be because the inboard passage is blocked, explained by referring to the sketch of the vane box Because the slider door method of weight-flow and port tab in figure 2 ( d ). With the port tab in-control affected thrust ratio much less than did inner stalled, the vanes form three distinct nozzle passages. door angle for a similar variation in discharge coeffi-As discussed previously, all three passages have an cient, it in all probability would be considered a more aft-facing external expansion surface which is some-desirable method of reverser port area control, what larger for the effiux angle of 130 ° than for any other efflux angles except 140 ° and 26 °. As noted in Asymmetric port area modulation. As discussed reference 23, nozzle configurations with an external previously, asymmetric effiux angle configurations expansion surface generally have a tendency...