Combustion chamber for a gas turbine engine having a variable ra

Details Combustion chamber for a gas turbine engine having a variable ra Combustion chamber for a gas turbine engine having a variable ra

1981-06-15

1983-04-26

Croyle, Carlton R.

Power plants

Combustion products used as motive fluid

With variable oxidizer control

60751, F02C 704, F02C 914

Patent

active

043808956

ABSTRACT:
A combustion chamber of a gas turbine engine has an upstream variable rate diffuser for controlling the airflow into first and second annular ducts which partially surround the combustion chamber, primary and dilution air flowing into the combustion chamber from the first annular duct and bypass air flowing into the combustion chamber from the second annular duct. The variable rate diffuser comprises a primary duct and downstream fence located in a secondary duct which has a bleed duct with a variable bleed rate, the outlet of the primary duct being smaller in diameter than the inlet to the first annular duct. In operation, by varying the bleed rate, the rate of diffusion into the combustion chamber can be varied, and if the bleed rate is reduced to low bleed conditions at high power conditions or to zero bleed condition at full power condition, vitiated air can be drawn from the combustion chamber and flowed in a reverse direction, upstream along the second annular duct and returned to the combustion chamber at its upstream end whereby the rate of combustion is reduced thereby reducing emissions of NO.sub.x.

REFERENCES:
patent: 3577878 (1971-05-01), Greenwood et al.
patent: 3631675 (1972-01-01), Keiter et al.
patent: 3910035 (1975-10-01), Juhasz et al.
patent: 4062182 (1977-12-01), Fehler et al.
Adkins, R. C., "A Short Diffuser with Low Pressure Loss", Journal of Fluids Eng., Sep. 1975, pp. 297-302.

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