CN216697079U - Gas turbine engine core machine ground test bed air inlet heating system - Google Patents
Gas turbine engine core machine ground test bed air inlet heating system Download PDFInfo
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Abstract
The utility model belongs to the technical field of ground test bed of a gas turbine engine, and particularly relates to an air inlet heating system of a ground test bed of a core engine of the gas turbine engine, which comprises an air source, a blender, a cold air channel and a hot air channel; the cold air channel is used for introducing air into the blender from the normal-temperature air flow; the hot air channel is provided with an electric heater for heating air and is used for leading heated air to the blender; the blender mixes the heated air and the normal temperature air flow, adjusts the temperature of the heated air and then introduces the air to the inlet end of the core machine through a valve group V8. According to the scheme, the low-pressure fan is used as an air source, the electric heater is used as a heat source, temperature and flow are adjusted through means of cold and hot air flow mixing, valve adjustment and the like, and accurate and controllable temperature and flow can be achieved; the accurate regulation of air current temperature, flow, pressure can be realized, the experimental demand of core machine normal pressure that heats can be satisfied, has low relative cost again, possesses good economic suitability and flexibility.
Description
Technical Field
The utility model belongs to the technical field of ground test beds of gas turbine engines, and particularly relates to an air inlet heating system of a ground test bed of a core engine of a gas turbine engine.
Background
A gas turbine engine is an internal combustion type power machine that converts energy of gas into useful work, and is widely used in the fields of civil power generation, gas transportation, and the like, or as a power device applied to airplanes or large ships. The gas turbine engine is used as a weighting device in China, has great research difficulty, is the centralized embodiment of the technical capability of the industry in China, and is praised as a bright pearl on the industrial crown. In the development process of the gas turbine engine, in order to reduce the development risk and shorten the development period, trial runs are generally respectively carried out under the conditions of normal-pressure normal-temperature air inlet, heating normal-pressure air inlet and heating and pressurizing air inlet in the development stage of the core machine so as to verify various performance indexes of the core machine in different working states.
The core machine test under the condition of heating and normal-pressure air inlet is generally carried out on the basis of the completion of the test under the condition of normal-temperature and normal-pressure air inlet. The air flow in front of the inlet of the core machine needs to be heated, and the physical rotating speed and the temperature in front of the high-pressure turbine are increased under a specific conversion rotating speed so as to simulate the working state of the core machine in the whole machine and check and verify the mechanical characteristics and the heat load characteristics of the components of the core machine.
The core machine heating normal pressure test can be carried out on a special core machine test bed or a high-altitude platform, and air inlet heating can be realized on a conventional engine ground test bed through bench modification.
The conventional air inlet warming system on the engine ground test bed generally adopts two modes, one mode is to use high-temperature gas exhausted by a mature gas turbine engine or an engine as a heat source, and the other mode is to directly heat air by using a plurality of single-tube combustion chambers. The two heating and air inlet modes have two defects, namely, the pressure loss of the airflow at the inlet end of the core machine is large, the flow cannot be actively regulated, the temperature regulation precision and sensitivity are not high, and the accurate control cannot be realized; secondly, combustion products of the engine serving as a heat source can enter the core machine test piece, so that the combustion and the emission of the core machine are influenced, and the measurement and the calculation of performance data are not facilitated.
The special core machine test bed and the high-altitude platform need to be matched with a special air source station and a whole set of air supply pipe network, a heat exchanger, a heating source (generally, a plurality of single-pipe combustion chambers can be used for burning natural gas), a blender, a high-temperature high-pressure valve and a control system to realize the adjustment of temperature, pressure and flow. Wherein, the air source station needs to be provided with a centrifugal compressor and a special transformer substation, a frequency converter, a cooling circulating water station, a control system and the like which are matched with the centrifugal compressor, the manufacturing cost is hundreds of millions at any moment, and the investment is extremely large. Because the air source station and the air supply system are expensive, high in energy consumption, long in construction period and extremely high in construction difficulty, only the great countries of America, Russia, English and Medium aviation have a small number of special test beds in the world at present and have the capability of the core machine inlet end heating and pressurizing test. The special core machine test bed and the special high-altitude platform in China are very limited, and in addition, the test task is heavy and resources are short, so that the requirement of the core machine test task which is gradually increased in China cannot be met.
Therefore, a core machine ground test bed heating system which can realize accurate adjustment of air flow temperature, flow and pressure, can meet the requirement of a core machine heating normal pressure test, has relatively low manufacturing cost and has good economic applicability and flexibility is needed to be designed.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems of high construction and use cost and complex structure of the core engine ground test bed heating system in the prior art, the scheme provides the gas inlet heating system for the core engine ground test bed of the gas turbine engine.
The technical scheme adopted by the utility model is as follows:
a gas turbine engine core machine ground test bed air inlet heating system comprises an air source unit, a blender, a cold air channel and a hot air channel; the air source unit is provided with a plurality of low-pressure fans which can be roots fans and can be divided into a plurality of groups; the cold air channel and the hot air channel are respectively formed by connecting a pipeline and a valve, and air source units are respectively arranged at the inlets of the cold air channel and the hot air channel; the cold air channel is used for introducing air into the blender from the normal-temperature air flow; the hot air channel is provided with an electric heater and is used for introducing heated air to the blender; the blender mixes the heated air and the normal temperature air flow, adjusts the temperature of the heated air and then introduces the air to the inlet end of the core machine through a valve group V8.
As a complement or alternative to the above: the air source unit arranged at the upper inlet of the cold air channel comprises a plurality of low-pressure fans, wherein the outlet ends of the two low-pressure fans are respectively provided with a valve V1 and a valve V2, and the outlet ends of the valve V1 and the valve V2 are communicated with the blender through a valve V5.
As a complement or alternative to the above: the air source unit arranged at the upper inlet of the cold air channel comprises a plurality of low-pressure fans, wherein the outlet ends of two low-pressure fans are respectively provided with a valve V3 and a valve V4; the outlet ends of the valve V3 and the valve V4 are connected in parallel and then communicated to the inlet end of the electric heater through a valve V6, and the outlet end of the electric heater is communicated with the blender.
As a complement or alternative to the above: and a first air bleeding branch is arranged at the outlet end of the electric heater, and an exhaust silencer and a valve V11 are arranged on the first air bleeding branch.
As a complement or alternative to the above: the outlet end of the blender is provided with a pressure regulating valve V9; the pressure regulating valve V9 is communicated with the valve group V8, and a second air bleeding branch is arranged between the pressure regulating valve V9 and the valve group V8; the second bleed branch is provided with a valve group V7 and is used for discharging the redundant gas into an exhaust tower arranged at the outlet end of the core machine.
As a complement or alternative to the above: a flow measuring channel and a rectifying chamber are arranged at the inlet end of the core machine in sequence; the valve set V8 communicates to the inlet end of the rectification chamber.
As a complement or alternative to the above: the inlet end of the rectification chamber is also connected with an air inlet tower; an exhaust tower is arranged at the outlet end of the core machine; the outlet end of the gas inlet tower is communicated with the rectification chamber, and a valve V10 is connected to the outlet end.
As a complement or alternative to the above: the valve adopts an electric valve; temperature sensors are respectively arranged at the electric heater, the blender and the valve group V8; temperature sensors and pressure sensors are respectively arranged at the electric heater, the blender and the valve group V8.
The utility model has the beneficial effects that:
1. according to the scheme, low-pressure fans such as Roots fans and the like are used as the air source unit, the electric heater is used as a heat source, temperature and flow are adjusted through means such as cold and hot air mixing and valve adjustment, and accurate and controllable temperature and flow can be achieved; the device can realize accurate adjustment of the temperature, flow and pressure of the air flow, can meet the requirement of a core machine heating normal pressure test, has relatively low manufacturing cost, and has good economic applicability and flexibility;
2. compared with an air source system matched with a special core machine test bed and a high-altitude platform in the prior art, all equipment in the scheme adopts the existing mature technology, so that the engineering implementation difficulty is low, the investment is low, the energy consumption is low, the construction period is short, and the application is more flexible; the Roots blower with high technical maturity and low price is used as an air source, the air supply pressure and temperature are low, the requirements on pipelines and valves are not high, the price is low, and the manufacturing cost of the whole set of system is about one tenth of that of an air supply system with the same flow level. Therefore, the method can be conveniently and quickly implemented under the condition of low investment, can be widely applied to the conventional ground test bed, solves the problems of large investment and long period of the special core engine test bed for construction, can relieve urgent needs of the market, and has good economic benefit and social benefit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a schematic structural diagram of an air inlet warming system of a ground test bed of a core engine of a gas turbine engine in the scheme.
In the figure: 1-an exhaust column; 2-a core machine; 3-a flow measurement channel; 4-a rectification chamber; 5-an air inlet tower; 6-an exhaust silencer; 7-a blender; 8-an electric heater; 9-air source unit.
Detailed Description
The technical solutions in the embodiments will be described clearly and completely with reference to the accompanying drawings, and the described embodiments are only a part of the embodiments, but not all embodiments, and all other embodiments obtained by those skilled in the art without creative efforts will belong to the protection scope of the present solution based on the embodiments in the present solution.
Example 1
The core machine 2 is the most important component of the gas turbine jet engine, comprises a high-pressure compressor, a combustion chamber and a high-pressure turbine, and is a component and a system with the highest temperature, the highest pressure and the highest rotating speed in an engine system, so the mastery degree of the core machine 2 is the key for the success of the development of a new engine, and according to statistics, more than 80 percent of technical problems in the development process of the engine are closely related to the core machine 2, so the core machine 2 is required to be used as an independent system for research.
Because a lot of uncertainties exist in the core machine 2, such as complex energy and mass exchange between main flow gas and cooling air in turbine components, influence of air temperature change on component clearance and the like, it is difficult to establish a mathematical model completely conforming to actual working conditions, and tests must be performed through tests under the condition that the core machine 2 is close to the actual working conditions, and the core machine 2 tests are particularly critical. Through the core machine 2 test, not only can reduce the development risk of complete machine by a wide margin, can shorten the development cycle of complete machine moreover greatly.
The core machine 2 test is carried out on a ground platform or a heating and pressurizing test platform, mainly aiming at obtaining the total mechanical operation condition and the total performance of the core machine 2, checking the working state of the components and the system of the core machine 2 under the condition close to the real working condition, measuring various parameters of the core components in the operation process, and obtaining relevant detailed test data required by checking, verifying and confirming of a design simulation tool so as to find and solve various problems in the design and manufacturing process of the core machine 2.
In the development stage of the core machine 2, the test runs are generally performed under the conditions of normal pressure and normal temperature air intake, heating and normal pressure air intake and heating and pressurizing air intake respectively so as to verify various performance indexes of the core machine 2 in different working states.
In the core machine 2 test under the condition of heating and normal-pressure air inlet, the air flow needs to be heated before the inlet of the core machine 2, and the physical rotating speed and the high-pressure turbine front temperature are increased under the specific conversion rotating speed so as to simulate the working state of the core machine 2 in the whole machine and check and verify the mechanical characteristics and the thermal load characteristics of the core machine 2 components.
Taking a novel gas turbine engine as an example, the physical rotating speed of a high-pressure rotor of the whole engine in the maximum working state of the engine is 9800r/min, and the front temperature of a high-pressure turbine is 1636.5K. Under the condition of normal temperature and normal pressure air inlet, the core machine is limited by the temperature of inlet air, when the conversion rotating speed is 100%, the physical rotating speed can only reach 7500r/min, the temperature of the outlet end of a combustion chamber can only reach 1000K, and the mechanical performance and the thermal load characteristic of the core machine under the maximum physical rotating speed and the maximum working temperature cannot be completely checked and verified, so that the test under the condition of normal pressure heating air inlet is required. Through calculation, when the core machine is tested under the condition of heating and normal-pressure air inlet, the temperature of the airflow at the inlet end needs to be increased to 389.5K, and a specific conversion rotating speed is kept, so that the physical rotating speed of the core machine, the temperature of a combustion chamber and the temperature before a turbine are equivalent to the maximum working state of the whole machine. In this operating state, the following main test operations can be carried out:
a) measuring the rotating force of a high-pressure compressor, the dynamic stress of a stator blade, the blade tip clearance, the vibration value of a casing and the like in the process from slow turning to the maximum physical rotating speed;
b) measuring the airflow pulsation in the combustion process of the combustion chamber;
c) measuring the temperature state of the flame tube wall at the highest working temperature;
d) measuring the pneumatic parameters of the turbine when the maximum value of the turbine is close to the working state of the complete machine;
e) measuring parameters of a turbine cooling system, and verifying whether the design of the cooling system meets requirements under the maximum heat load state;
f) and measuring the temperature field distribution behind the high-pressure turbine.
Therefore, the air inlet heating system of the ground test bed of the core engine of the gas turbine engine is designed in the embodiment, as shown in fig. 1, the air inlet heating system comprises an air source unit 9, a blender 7, a cold air channel, a hot air channel and the like. The components in the system are connected through pipelines.
The inlet end of the rectification chamber 4 is connected with an air inlet tower 5; the outlet end of the core machine 2 is connected with an exhaust tower 1; the outlet end of the gas inlet tower 5 is communicated with the rectification chamber 4, and a valve V10 is connected to the outlet end. The exhaust tower 1, the core machine 2, the flow measurement channel, the rectification chamber 4 and the air inlet tower 5 are sequentially arranged in a straight line shape.
The cold air channel is used for introducing air into the blender 7 from the normal temperature air flow; one or more low-pressure fans for air entraining are arranged at the inlet of the cold air channel, and the low-pressure fans form an air source unit 9; the low pressure fan may be a roots fan. Specifically, two roots blowers are arranged on the cold air channel, and the outlet ends of the two roots blowers are respectively provided with a valve V1 and a valve V2; the outlet ends of the valve V1 and the valve V2 are connected in parallel and then communicated with the blender 7 through a valve V5.
The hot air channel is provided with an electric heater 8 for heating air and is used for introducing heated air to the blender 7; one or more low-pressure fans for bleed air are arranged at the inlet of the hot air channel, which low-pressure fans form a further air supply unit 9, which low-pressure fans can be roots fans. Specifically, two roots blowers are arranged on the hot air channel, and the outlet ends of the two roots blowers are respectively provided with a valve V3 and a valve V4; the valve V3 and the outlet end of the valve V4 are connected in parallel and are communicated to the inlet end of an electric heater 8 through a valve V6, and the outlet end of the electric heater 8 is communicated with a blender 7.
The outlet end of the electric heater 8 is provided with a first air bleeding branch, and the first air bleeding branch is provided with an exhaust silencer 6 and a valve V11. This first gassing branch road can be according to the air current temperature of experimental demand, carries out the gassing to the hot-air, makes the cold-hot air mix into a certain proportion in the blender to reach temperature regulation's purpose, exhaust silencing device can also subduct the noise that exhaust passage produced to a certain extent.
The blender 7 blends and adjusts the temperature of the heated air and the normal temperature air flow, and then introduces air to the inlet end of the core machine 2 through a valve group V8. The outlet end of the blender is provided with a pressure regulating valve V9 and a valve group V8, and the pressure regulating valve V9 and the valve group V8 are used for sending air subjected to blending temperature regulation and pressure regulation to the inlet of a core machine test piece; a second air bleeding branch is arranged between the pressure regulating valve V9 and the valve group V8, a valve group V7 is arranged on the second air bleeding branch, and the valve group V7 and the second air bleeding branch are used for exhaust in the test preparation stage during temperature and pressure regulation; and is used for matching with a valve group V8 to carry out flow regulation in the test stage, and discharging redundant airflow to the exhaust tower 1.
The V1-V10 in the embodiment are valves which can be electrically operated; the outlet ends of the electric heater, the blender and the valve group V8, the valve group V7 and the like are respectively provided with a temperature sensor and a pressure sensor.
A flow measuring channel 3 and a rectifying chamber 4 are arranged at the inlet end of the core machine 2 in sequence; the valve block V8 communicates to the inlet end of the rectification chamber 4.
When the air inlet heating system of the embodiment is used, firstly, the temperature and pressure regulation and the pipeline preheating of the air inlet heating system are needed. Before starting the core machine 2, the valve V10 is kept in a normally open state, the valve group V8 is closed, the low-pressure fan is started, one group of air source units supplies air to the heater, the heater heats part of compressed air from the air source units, the heated part of compressed air and the other part of compressed air from the air source units are mixed in the mixer 7, meanwhile, the air is discharged through the valve V11 for temperature adjustment, and then the temperature is reduced to the standard atmospheric pressure (or slightly higher than the atmospheric environmental pressure) through the pressure reducing valve V9 and then discharged to the exhaust tower 1 through the valve group V7 until the air temperature is adjusted to the temperature required by the test. Through the process, each corresponding pipeline in the system is preheated to reduce the heat loss in the air supply state. In this state, the valve group V7 is kept fully open, and the valve group V8 is normally closed.
After the steps are completed, the core machine 2 can be started, and the core machine 2 is driven to rotate by the starter, and is started to rotate to the slow speed by sucking air from the air inlet tower 5. Then, switch to partial air supply: the valve group V8 is partially opened, and the core machine 2 is operated in the slow running state to maintain the steady state while mixing the intake air from the atmosphere and the air supply line.
Then, switching to the full air source unit 9 for air supply: the valve 10 is completely closed step by step through the cooperative regulation of the valve V10 and the valve group V8, and finally the air supply is switched to be completely supplied by the air source unit until the core machine 2 is stable in slow turning speed, and then the test under the formal heating air inlet condition can be carried out.
The test is carried out under the air supply state of the air source unit: at each preset rotating speed point, the temperature of the blending gas is regulated through a valve V11, and the parameters of the core machine 2 are measured and recorded at each set temperature point until the highest controllable temperature point; when the rotating speed state of the core machine 2 changes, the air flow is adjusted through the valve group V7 and the valve group V8 according to the state point of the core machine 2, so that the flow requirements of the core machine 2 in different rotating speed states are met.
In the test process, if the emergency stop is needed, the valve control system can quickly turn off the valve V8 and fully open the valves V10 and V7, so that the core machine test piece and the air supply system are prevented from being damaged.
The above examples are merely for clearly illustrating the examples and are not intended to limit the embodiments; and are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the technology so far introduced are within the scope of protection of the present technology.
Claims (8)
1. The utility model provides a gas turbine engine core machine ground test bed heating system that admits air which characterized in that: comprises an air source unit (9), a blender (7), a cold air channel and a hot air channel; the air source unit (9) is provided with a plurality of low-pressure fans which can be roots fans; the cold air channel and the hot air channel are respectively formed by connecting a pipeline and a valve, and air source units (9) are respectively arranged at the inlets of the cold air channel and the hot air channel; the cold air channel is used for leading air to the blender (7) from the normal temperature air flow; the hot air channel is provided with an electric heater (8) and is used for introducing heated air to the blender (7); the blender (7) blends and adjusts the temperature of the heated air and the normal temperature air flow, and then leads the air to the inlet end of the core machine (2) through a valve group V8.
2. The gas turbine engine core ground test bed inlet air warming system of claim 1, wherein: the inlet on the cold air channel is provided with a plurality of low-pressure fans, the outlet ends of two low-pressure fans are respectively provided with a valve V1 and a valve V2, and the outlet ends of the valve V1 and the valve V2 are communicated with the blender (7) through a valve V5.
3. The gas turbine engine core ground test bed inlet air warming system of claim 1, wherein: a plurality of low-pressure fans are arranged at the upper inlet of the cold air channel, and the outlet ends of two low-pressure fans are respectively provided with a valve V3 and a valve V4; the outlet ends of the valve V3 and the valve V4 are connected in parallel and then communicated to the inlet end of the electric heater (8) through a valve V6, and the outlet end of the electric heater (8) is communicated with the blender (7).
4. The gas turbine engine core ground test bed inlet air warming system of claim 1, wherein: the outlet end of the electric heater (8) is provided with a first air bleeding branch, and the first air bleeding branch is provided with an exhaust silencer (6) and a valve V11.
5. The gas turbine engine core ground test bed inlet air warming system of claim 1, wherein: a pressure regulating valve V9 is arranged at the outlet end of the blender (7); the pressure regulating valve V9 is communicated with the valve group V8, and a second air bleeding branch is arranged between the pressure regulating valve V9 and the valve group V8; the second bleed branch is provided with a valve group V7 and is used for discharging the redundant gas into an exhaust tower (1) arranged at the outlet end of the core machine (2).
6. The gas turbine engine core ground test bed inlet air warming system of any one of claims 1 to 5, wherein: a flow measuring channel (3) and a rectification chamber (4) are arranged at the inlet end of the core machine (2) in sequence; the valve group V8 is connected to the inlet end of the rectification chamber (4).
7. The gas turbine engine core ground test bed inlet air warming system of claim 6, wherein: the inlet end of the rectifying chamber (4) is also connected with an air inlet tower (5); an exhaust tower (1) is arranged at the outlet end of the core machine (2); the outlet end of the air inlet tower (5) is communicated with the rectification chamber (4), and a valve V10 is connected to the outlet end.
8. The gas turbine engine core ground test bed inlet air warming system of claim 1, wherein: the valve adopts an electric valve; temperature sensors are respectively arranged on the electric heater (8), the blender (7) and the valve group V8; pressure sensors are respectively arranged at the electric heater (8), the blender (7) and the valve group V8.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115586013A (en) * | 2022-12-09 | 2023-01-10 | 中国航发沈阳发动机研究所 | Durability test system for core machine of aircraft engine |
| CN115597881A (en) * | 2022-12-09 | 2023-01-13 | 中国航发沈阳发动机研究所（Cn） | Method for verifying starting and slow running of core engine of aircraft engine |
| CN115753131A (en) * | 2022-12-09 | 2023-03-07 | 中国航发沈阳发动机研究所 | Verification method for high-temperature and high-pressure environment of core engine of aircraft engine |
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2022
- 2022-05-09 CN CN202221085736.XU patent/CN216697079U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115586013A (en) * | 2022-12-09 | 2023-01-10 | 中国航发沈阳发动机研究所 | Durability test system for core machine of aircraft engine |
| CN115597881A (en) * | 2022-12-09 | 2023-01-13 | 中国航发沈阳发动机研究所（Cn） | Method for verifying starting and slow running of core engine of aircraft engine |
| CN115753131A (en) * | 2022-12-09 | 2023-03-07 | 中国航发沈阳发动机研究所 | Verification method for high-temperature and high-pressure environment of core engine of aircraft engine |
| CN115597881B (en) * | 2022-12-09 | 2023-03-10 | 中国航发沈阳发动机研究所 | Method for verifying starting and slow running of core engine of aircraft engine |
| CN115586013B (en) * | 2022-12-09 | 2023-03-14 | 中国航发沈阳发动机研究所 | Durability test system for core machine of aircraft engine |
| CN115753131B (en) * | 2022-12-09 | 2023-09-22 | 中国航发沈阳发动机研究所 | High-temperature high-pressure environment verification method for aircraft engine core engine |
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