A fuel supply system and method for a low-power gas turbine engine

Abstract

The invention discloses a fuel supply system for a small-power gas-turbine engine. The fuel supply system comprises an air inlet box which is integrally cast, a support plate, a fuel injection pipe, a turbine shaft, a swirling flow strip and a centrifugal nozzle. The invention also discloses a fuel supply system method for the small-power gas-turbine engine. The method comprises the following steps of: feeding fuel into a fuel conveying pipeline in a support plate through an external pipeline on the air inlet box; connecting the front end of the fuel conveying pipeline with the fuel injection pipe; putting the fuel injection pipe into an inner bore of the turbine shaft; spraying fuel onto the swirling flow strip by use of the fuel injection pipe, and guiding the flue into a fuel slinging region by virtue of the swirling flow strip; and then spraying the fuel into a baffling combustion chamber through the centrifugal nozzle on the turbine shaft. The swirling flow strip is capable of effectively improving the fuel delivery pressure, and ensuring that the fuel is uniformly distributed along the circumferential direction; the centrifugal nozzle is adopted for replacing a fuel flinger, so that the fuel aotmization effect is increased and the fuel-lean blowout range is improved.

Description

technical field [0001] The present invention relates to the technical field of gas turbine engines, and more particularly relates to a fuel supply system and method for a low-power gas turbine engine. Background technique [0002] Small-power gas turbine engines mostly use a centrifugal oil throwing plate to baffle the combustion chamber, and its fuel supply can be divided into in-shaft oil supply and off-shaft oil supply. [0003] The oil supply in the shaft is mainly composed of oil delivery pipe, turbine shaft (rotary oil delivery shaft), sealing device, and oil throwing plate. The principle is that fuel oil enters the rotating hollow turbine shaft through the oil delivery pipe, and sealing devices such as graphite seals are used to prevent the oil delivery pipe from contacting the turbine shaft. The fuel leaks between the flame tubes, the fuel enters the oil thrower through the hollow shaft, and is thrown out from the radial holes on the oil thrower by centrifugal force,...

AI Technical Summary

Problems solved by technology

[0005] In-shaft fuel supply has to pass through the turbine shaft, resulting in a long fuel flow path, large pressure loss, uneven fuel distribution, and the fuel supply pressure of the fuel nozzle cannot be reached, so a centrifugal oil thrower is often used;

[0006] The centrifugal oil thrower rotates synchronously with the turbine blades. When the oil supply to each injection hole on the oil thrower is uneven, fixed hot spots on the turbine blades will appear, resulting in overheating damage to the turbine blades.

[0007] Oil leakage is prone to occur in the rotary seal of the internal oil supply mode. Changing to the external oil supply mode has improved slightly, but the structure of the external oil supply mode is complicated and it is in a high temperature area. To ensure the sealing effect, the clearance needs to be strictly controlled

[0008] The range of lean flameout using the oil thrower is narrower than that of the centrifugal nozzle

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