RU2365892C1 - Method of diagnosing and repairing nonreusable and short-life gas turbine engines - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: invention relates to rocketry, particularly to diagnosis, repairing, acceptance and delivery of gas turbine engines for aircraft and power installations, which work on liquid and gas fuels. The method of diagnosing and repairing nonreusable and short-life gas turbine engines involves recording current criteria values of the engine condition, comparing them with given standard values, eliminating detected defects and carrying out inspection tests. Current criteria values of the engine state are recorded through visual inspection with subsequent disassembling of the engine, sending the assemblies and component parts to vendors and manufacturers, carrying out non-destructive control methods and laboratory tests. The recorded criteria values of the engine are compared, for example, with criteria of the condition of an engine, which has withstood official tests, and formation of minor components to be repaired, replaced and considered suitable for assembling, while meeting requirements for repairing the list of assemblies. The engine is then assembled and mounted on a testing stand. Stand acceptance tests are done with adjustment of parameters and regulation of all its systems and tests on compliance with specifications for quality of assembling and compliance of key engine parameters to given values. An engine is chosen from the batch which has undergone acceptance tests and endurance tests are carried out on that engine. During fatigue testing, there is further running which exceeds the total operating time of all operation modes. Making conclusion on evaluation of repairing technique and allowing engines, belonging to one batch, for further use with initial fixed or changed service life is done without disassembling the engine, and after that, the rest of the engines from this batch are accepted and delivered for operation. Further running is done, exceeding the total operating time for all operating modes by 1.5…2 times.

EFFECT: such a method widens functional capabilities of functional testing assemblies.

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Description

The invention relates to the field of jet engineering, in particular to the field of diagnosis, repair, acceptance and delivery of gas turbine engines for aircraft and power plants operating on liquid and gaseous fuels.

There is a method for diagnosing and repairing gas turbine propulsion systems, which consists in registering the current values of the criteria for the condition of the engine, comparing them with the given reference values, eliminating the identified defects and conducting control checks (see RF patent No. 2173451, G01M 15/00, 09/10/2001, )

The disadvantage of this method is the limited number of recorded and evaluated parameters, since basically either a partial check is made by visual inspection of the engine or a check of the operability of its systems (fuel, oil, electrical circuits, control-recording and recording equipment, etc.), which is typical for routine scheduled maintenance. However, after the engine returns from service or after long-term storage, complete information on the technical condition of the units, modules, units and parts, identification of the repair volume and replacement of failed parts with disassembly of the engine and special types of control, and special types of tests are required. The known method due to lack of information allows only partially to evaluate the technical condition of the engine, and therefore, cannot guarantee reliable operation when the engine is returned to operation during the assigned or newly installed resource.

The objective of the invention is to expand the functionality of checking the performance of units, components and engine parts, checking the maximum wear and tear, identifying replacement material of repair engines that cannot be repaired and rebuilding, checking repair technology and the procedure for establishing and increasing the life of engines, their units and component parts.

The specified technical result is achieved by the fact that in the method for diagnosing and repairing disposable and short-life gas turbine engines, which consists in registering the current values of the engine condition criteria, comparing them with the set reference values, eliminating the detected defects and conducting control checks, recording the current values of the engine condition criteria is carried out visually inspection followed by disassembly of the engine, sending purchased units and components to developers manufacturers, by conducting non-destructive testing methods and laboratory tests, compare the registered values of the engine criteria, for example, with the criteria of the state of an engine that has passed state tests, and compile lists of units, assemblies and parts to be repaired, replaced, and approved that are fit for repair technology for assembly, assemble the engine, install it on a test bench, conduct acceptance tests with debugging parameters and adjusting the sun x its systems and checking for compliance with the technical conditions of the build quality and the main engine parameters with the specified values, select the engine from the party from the number of acceptance tests that have been carried out, conduct bench tests on it, then carry out additional operating hours exceeding the total operating time for all operational modes, the formation of a conclusion on the assessment of repair technology and the admission of engines belonging to one batch to further operation with the initial the assigned or changed resource is produced without disassembling according to the technical condition of the engine and after that the other engines of this batch are accepted and sent into operation.

In addition, they conduct additional operating hours exceeding 1.5 ... 2 times the total operating time at all operating conditions.

The invention is illustrated in the drawing, which shows a schematic block diagram of the implementation of the proposed method.

The method for diagnosing and repairing disposable and short-life gas turbine engines includes the following steps:

1 - delivery of the engine from operation;

2 - inspection of the engine;

3 - engine disassembly;

4 - sending the disassembled material of the engine;

5 - sending dismantled from the engine aggregates and components to manufacturers;

6 - sending units and engine parts for the passage of non-destructive testing methods;

7 - laboratory tests;

8 is a comparison of recorded engine criteria with reference values;

9 - formation of a list of units, assemblies and parts to be repaired, replaced and approved for assembly;

10 - assembly of engines;

11 - carrying out acceptance tests with debugging parameters and adjusting all its systems and checking for compliance with the technical conditions of the quality of the assembly and the main engine parameters to the specified values;

12 - carrying out bench life tests on the engine selected from the batch;

13 - continuation of life tests (additional operating time);

14 - formation of a conclusion on the assessment of repair technology and the admission of engines to further operation;

15 - the acceptance and dispatch of the engines of this batch in operation;

16 - operation of engines.

A method for diagnosing and repairing gas turbine engines is as follows.

After the development of the intended resource, the engine or the entire batch of the series is taken out of operation (stage 1) to the serial or repair plants. The operation of the engine includes operation with an assigned warranty resource, established by the normative and technical documentation after the engine undergoes a cycle of finishing and experimental work. The engine resource, for example, before the first overhaul is due to the total operating time at all operating modes, when it is reached, the use of the engine for its intended purpose should be stopped. The assigned engine resource is achieved by a phased increase from the initial value established at the time of serial operation to the value of the full assigned resource, indicated, for example, in the technical specifications for the engine or taking into account economic feasibility. In factories, after the engine has been delivered, a visual inspection is carried out (stage 2) with a checklist compiled, which lists all the damage the engine suffered during operation, transportation and long-term storage (nicks on compressor blades, condition of fuel, oil, air pipelines, condition electrical communications, metering communications systems of technical diagnostics, damage to units, traces of corrosion, etc.). In the same inspection sheet, measures to eliminate identified defects are also indicated. After that, a complete disassembly (stage 3) of the engine (the entire batch or series) is performed to determine the technical condition of its components, parts, assemblies and components. In the process of disassembling, all defects identified by visual inspection are recorded, indicating measures to eliminate them or indicating additional studies to establish the true causes of the defects. Next, the sending (step 4) of the disassembled material of the engine. All assemblies and purchased components dismantled from the engine are sent (step 5) to developers and manufacturers for disassembling, conducting special control methods, special laboratory tests, assembling, debugging tests for all systems and life tests (one or more units) with a resource confirmation , which should correspond, as a rule, to engine resources or exceed them in a number of times a multiple of engine resources. In parallel with sending the purchased units and components to developers and manufacturers, they send (stage 6) the engine components and parts for non-destructive testing (color inspection, X-ray, measurements of the geometric dimensions of the components and individual main engine parts (compressor rotors and turbines, shafts, flame tubes of the main and afterburner combustion chambers, housings, etc.) with registration of all detected defects and recommendations for their elimination. The cells are subjected to laboratory tests (stage 7) at special test benches of the plant (spillage of the fuel collectors of the combustion chamber, measurements of temperature fields in order to determine and debug a given value of the circumferential and radial unevenness of gas temperatures at the outlet of the combustion chamber, conduct special laboratory tests of non-purchased units, check laboratory conditions of electrical equipment, checking pressure pipelines of oil, fuel and hydraulic systems, etc.). In the process of all studies, a comparison is made (step 8) of the registered engine criteria with reference values, for example, with the engine criteria recorded during state bench tests. Upon completion of all studies of engine assemblies and parts, after disassembling and faulting of engine assemblies and parts, receiving a positive conclusion from developers and manufacturers on units and purchased component parts about the absence of defects associated with working out the resource and affecting work safety, form a list (stage 9) in compliance with the requirements of the repair technology of units, assemblies and parts to be repaired, replaced and approved for assembly. From approved and new (repaired) engine assemblies and parts, assemblies and components, the engine (batch or series) is assembled (step 10) for benchmark acceptance tests (step 11) with debugging of parameters and adjustment of all its systems and checking for compliance with technical conditions build quality and basic engine parameters to the specified values in accordance with the regulatory and technical documentation for the engine. Of all the assembled batches or series of engines, any engine is randomly selected and sent for bench-based life tests (step 12), while the remaining engines of the lot or series after passing tests for debugging and testing are not sent to special permission. After satisfactorily passing the life tests (step 12), then, according to the program of life tests, (additional step 13) is carried out, additional operating hours exceeding the total operating time by 1.5 ... 2 times in all operating conditions. This interval is determined by calculation or experimentally, based on ensuring the reliability of the engine during the development of the resource. Formation of a conclusion (step 14) on the assessment of repair technology and the admission of engines belonging to one batch to further operation with the initial assigned or changed resource is performed without disassembling according to the technical condition of the engine according to the normative and technical documentation, then they are accepted (step 15) and sent the remaining engines of this batch in operation (step 16).

Thus, the overhaul and repair of the engine, its units and components according to the proposed method with registration in the act of each repair operation, the necessary measurements of parts, assemblies and engine parameters, comparison of the registered current values of the engine condition criteria allows to evaluate the technical condition of the repair state with high reliability engine, evaluate the effectiveness of the use of repair technology and taking into account the economic feasibility of gradually increasing the engine resource to the full assigned value specified in the regulatory and technical documentation for the batch or for the entire series of engines and in general to guarantee reliable operation when the engine is returned to operation during the assigned or newly installed resource.

Claims (2)

1. A method for diagnosing and repairing disposable and short-life gas turbine engines, which consists in registering the current values of the engine condition criteria, comparing them with the specified reference values, eliminating the identified defects and conducting control checks, recording the current values of the engine condition criteria by visual inspection, followed by disassembling the engine, sending purchased units and components to developers and manufacturers, carrying out non-destructive x control methods and laboratory tests, compare the registered values of the engine criteria, for example, with the criteria of the state of an engine that has passed state tests, and compile lists of assemblies, components and parts to be repaired, replaced and approved for assembly in compliance with the repair technology requirements, assemble the engine , install on a test bench, conduct benchmark acceptance tests with debugging parameters and adjusting all its systems and checking for compliance with technical according to the assembly quality and the main engine parameters, the specified values are selected from the lot that passed the acceptance tests, the engine from the batch, bench tests are carried out on it, then the additional operating hours exceeding the total operating time at all operating conditions, the conclusion of the assessment of the repair technology is carried out according to the life test program and the admission of engines belonging to one batch to further operation with the initial assigned or changed resource is performed without Borki on the technical condition of the engine, and then carry out the acceptance and sending the rest of the party motors in operation. 2. The method according to claim 1, characterized in that they conduct an additional operating time exceeding 1.5 ... 2 times the total operating time at all operating conditions.

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