| 摘要 |
1,187,455. Boundary layer control. PHILIPS' GLOEILAMPENFABRIEKEN N.V. 28 June, 1967 [1 July, 1966], No. 29779/67. Heading F2R. [Also in Divisions F1 and F4] An ejector for a refrigerating or liquefied gas-producing system (see Division F4), comprises a jet pipe 20, a diffuser 21 and a suction inlet 22, increased suction at inlet 22 being achieved by removing the boundary layer surrounding the high-speed gas leaving the jet pipe. As shown, the boundary layer is removed by a groove 25 connected by a conduit 26 to a low-pressure point 27, or to the suction side of a compressor or ejector. In Fig. 4 (not shown), a shoulder is formed on the downstream side of groove 25. In Fig. 5 (not shown), a sleeve surrounds the jet pipe nozzle and has an annular flange spaced downstream from the nozzle opening, the flange aperture being of smaller diameter than the nozzle opening and the space within the sleeve between the flange and the nozzle opening being connected to a low-pressure point. |
