The development of injector units for jet-lift engine simulation on low-speed-tunnel models

Abstract

Small-scale injector units have been developed for providing the engine nacelles of V/STOL models, with both intake and exit flows. The primary energy supply was cold compressed air at pressure ratios up to 4:1. With the chosen injector arrangement, a stable and uniform exit velocity distribution was achieved, with a mean velocity of nearly 650 ft/sec, and almost 50 per cent of the jet efflux drawn in through the intake. The requirements for engine simulation on model scale, and the capabilities and limitations of injector units for this application are discussed in an Appendix.