System for controlling the thrust nozzle adjustment of dual cycl

Details System for controlling the thrust nozzle adjustment of dual cycl System for controlling the thrust nozzle adjustment of dual cycl

1983-01-14

1984-12-25

Casaregola, Louis J.

Power plants

Reaction motor

Method of operation

60242, F02K 106

Patent

active

044895500

ABSTRACT:
The thrust nozzle opening angle of two cycle gas turbine jet engines is crolled in a system which comprises a low pressure compressor driven by a low pressure turbine. A first compressor is arranged radially inward for a first flow cycle or circuit and a second compressor is arranged radially outward for a second flow cycle or circuit. A high pressure compressor is driven by a high pressure turbine. A combustion chamber is situated upstream of the high pressure turbine. An afterburner is supplied with the turbine gases from the first, hot flow cycle and with compressed air from the second, relatively cool flow cycle or circuit. The system may have multiple shafts. The control is effected with reference to the instantaneous pressure relationship (.pi..sub.NVZ) between the static pressure (p.sub.sD) downstream of the radially outer compressor (1a) of the second flow cycle (K2) and the static pressure (p.sub.sE) of the air flowing into the propulsion system. This ratio constitutes a variable rated control value (.pi..sub.NVZ-Soll) and is calculated as a function of the reduced rpm (N.sub.r) of the low pressure compressor (1). This type of control guaranties during a steady state operation particularly a minimal fuel consumption in the subsonic region and a maximum thrust in the supersonic region. This type of control further assures during a nonsteady type of operating, particularly the stability between the two aerodynamic limits, compressor surges (G1.sub.B or G1.sub.H) on the one hand and afterburner quenching (G2.sub.B or G2.sub.H) on the other hand.

REFERENCES:
patent: 3854287 (1974-12-01), Rembol
patent: 4139887 (1979-02-01), Levesque
patent: 4159625 (1979-07-01), Kerr

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