RU2173451C1 - Method for diagnostics and repairs of liquid fuel fired gas-turbine propulsion unit - Google Patents

Abstract

FIELD: jet technology. SUBSTANCE: method involves recording of current values of propulsion unit status criteria, their comparison with preset reference values, elimination of detected troubles, and verifying checks; standard equipment of propulsion unit, troubles, fuel and oil leaks, amount of fuel and oil in fuel and oil systems, respectively, are recorded; fuel and oil are drained, gas is evacuated from inner spaces of fuel and oil systems, power and low- current circuits are checked for signals, defective power and low-current harnesses, units, and parts are replaced by serviceable ones, circuits of automatic-control, measuring, and recording systems, as well as those of checking and recording devices are checked for signals; circuits are checked for continuity; fuel and oil are degassed. Upon elimination of troubles detected and replacement of gaskets and harnesses inner spaces of fuel and oil systems are filled with gas-free fuel and oil whereupon these systems are preserved. EFFECT: enlarged functional capabilities, improved confidence of power-plant serviceability check upon operation or storage.

Description

 The invention relates to the field of jet engineering, in particular to methods for diagnosing and repairing gas turbine propulsion systems.

 The closest analogue is a method for diagnosing and repairing a gas turbine propulsion system, which consists in recording the current values of the criteria for the state of the propulsion system, comparing them with the specified reference values, eliminating the identified defects and conducting verification checks (RU 2069847 C1, G 01 M 15/00, 01.01.99 )

 The disadvantage of this method is the limited number of registered parameters, which reduces the reliability of determining the technical condition of the propulsion system.

 The technical task of the proposed method is to expand the functionality, increase the reliability of determining the technical condition of propulsion systems after their operation or long-term storage.

 The objective is achieved by the fact that in the method of diagnosing and repairing a gas turbine propulsion system operating on liquid fuel, which consists in registering the current values of the criteria for the condition of the propulsion system, comparing them with the specified reference values, eliminating the identified defects and conducting control checks, register the completeness of the propulsion system, the presence damage, the presence of leaks of fuel and oil, the amount of fuel and oil, respectively, in the fuel and oil systems, drain oil and gas, remove gas from the internal cavities of the fuel and oil systems, check for signals in the electrical circuits, in the circuits of automatic control, measurement and recording systems and control and recording equipment, check the operation of the circuits, degass the fuel and oil, which, after correcting the detected defects fill the internal cavity of the fuel and oil systems and produce their conservation.

A device for implementing the proposed method contains:
visual inspection stand 1;
stand 2 measuring the amount (volume) of fuel and oil in the fuel and oil systems, draining and refueling with fuel and oil;
stand 3 for measuring signals in electrical and low-current circuits and checking the operability of circuits;
stand 4 for checking signals and circuits of control-recording and recording equipment;
stand 5 for the degassing of fuel and oil.

 The device operates as follows.

 At the stand 1 visual inspection check the completeness of the propulsion system and identify defects. Defects are detected in good light using a test tool (a set of magnifiers, mirrors with flexible holders, etc.), the tightness of the joints, the tightness of the capacities of the fuel and oil systems are assessed, the leak points and its intensity are determined. The tightness control is carried out by any known method, for example, using indicators based on the response of the indicator with respect to the medium enclosed in the test object. The chalk coating of the outer surface of the container, which darkens in leaky places from the leaking liquid, can serve as an indicator.

 At stand 2, the amount (volume) of fuel in the fuel system and oil in the oil system are measured. The liquid in the containers should reach certain marks of the measuring line. Then the liquid is poured into a clean container and transported to stand 5, gas is removed from the internal cavities of the fuel and oil systems, the failed rubber gaskets, bundles, etc., ensuring the tightness of the propulsion system are replaced.

 At stand 3, electrical and low-current circuits are inspected (insulation of the wiring, fastening and replacement of failed electrical and low-current harnesses, blocks, assemblies), the circuits are checked for performance (control checks).

 At stand 4, the signals and circuits of the control-recording and recording equipment are checked.

 At stand 5, degassing (removal of gas bubbles) of fuel and oil is performed.

 Work on the degassing of fuel and oil is performed to prevent air congestion of pipelines and / or nozzles supplying fuel to the combustion chamber of the engine and oil through spray nozzles to the bearings of the compressor and turbine, which can lead to engine shutdown and aircraft accident.

 Degassing is carried out by exposing the tank with liquid fuel and / or oil alternately low and high temperatures using, for example, a cryogenic installation.

 Complete degassing is achieved by running liquid fuel and / or oil through naturally occurring highly porous rocks and / or filters on the surface of which gas bubbles are adsorbed.

 After fixing the defects, the product is transported to stand 2, where the fuel and oil systems are refilled and preserved.

 The proposed method allows with high reliability to determine the technical condition of a gas turbine propulsion system that runs on liquid fuel, after its operation or long-term storage.

Claims (1)

 A method for diagnosing and repairing a gas turbine propulsion system running on liquid fuel, which consists in registering the current values of the criteria for the condition of the propulsion system, comparing them with the specified reference values, eliminating the identified defects and conducting control checks, characterized in that the completeness of the propulsion system is recorded in it, the presence damage, the presence of leaks of fuel and oil, the amount of fuel and oil, respectively, in the fuel and oil systems, drain fuel and oils, remove gas from the internal cavities of the fuel and oil systems, check for signals in the electrical and low-current circuits, replace failed electrical and low-voltage harnesses, blocks and assemblies, check for signals in the circuits of automatic control, measurement and registration systems, control and recording equipment, check the operation of the circuits, degass the fuel and oil, replace rubber gaskets and harnesses, fill the internal cavities of the fuel and oil systems with degassed fuel and oil, and then make their preservation.