| 摘要 |
764,064. Jet propelled rotary wing aircraft. NAPIER & SON, Ltd., D. May 4, 1954 [May 12, 1953], No. 13300/53. Class 4. [Also in Group XXVI] A power plant for a helicopter comprises a gas turbine plant, Fig. 1, generating combustion gas which passes by way of a rotary valve 15 as described in Specification 764,063 and a duct 16 to the nozzles of the jet-propelled rotor of the helicopter. In another position of valve 15, the gas is discharged through a duct 17 to exhaust or to a straight jet-propulsion nozzle. The gas is generated in combustion chambers 3 and, after traversing a turbine 4, passes to the valve 15 between cylindrical walls 18, 19, Figs 3 and 4, and is guided into a rectangular duct 20 by means of two guide vanes 27, one on either side, which extend from a single vane 28. In addition, there is a guide vane 29 having curved extensions 30, 31 which extend in a generally horizontal plane towards the discharge end of the turbine 4, and a vertical portion 32 which extends across the duct 20. A vertical partition 35 divides at its lower end into two curved or straight walls which are united to the wall 18. A compressor 5 draws in air through an intake 6 and discharges it into the space between the wall 19 and an outer cylindrical wall 21, where it is guided upwardly by two guide vanes 24, one on either side of the wall 19, into the space between the duct 20 and a further rectangular duct 22. Thus the hot gas from the turbine is jacketed by a stream of cool air which prevents overheating of the valve 15. This jacketing may be retained downstream of the valve. The compressor 5 and a compressor 1 which supplies air to the combustion chambers 3 are both directly driven by the turbine 4.
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