CN116480488A - Self-adaptive starting afterburning cycle engine system and starting method thereof - Google Patents
Self-adaptive starting afterburning cycle engine system and starting method thereof Download PDFInfo
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- CN116480488A CN116480488A CN202310726656.0A CN202310726656A CN116480488A CN 116480488 A CN116480488 A CN 116480488A CN 202310726656 A CN202310726656 A CN 202310726656A CN 116480488 A CN116480488 A CN 116480488A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000000446 fuel Substances 0.000 claims abstract description 164
- 239000007800 oxidant agent Substances 0.000 claims abstract description 46
- 230000001590 oxidative effect Effects 0.000 claims abstract description 44
- 238000002485 combustion reaction Methods 0.000 claims description 17
- 230000009194 climbing Effects 0.000 claims description 6
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 230000000630 rising effect Effects 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000002269 spontaneous effect Effects 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 39
- 238000004088 simulation Methods 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 238000001595 flow curve Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000003685 thermal hair damage Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/42—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
- F02K9/44—Feeding propellants
- F02K9/56—Control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/42—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
- F02K9/44—Feeding propellants
- F02K9/46—Feeding propellants using pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/42—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
- F02K9/44—Feeding propellants
- F02K9/56—Control
- F02K9/58—Propellant feed valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/95—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof characterised by starting or ignition means or arrangements
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention relates to a rocket engine device, in particular to a self-adaptive start afterburning cycle engine system and a start method thereof, which are used for solving the defects that the starting time sequence of the existing afterburning cycle engine system in the starting process is strict, and the starting success rate of the engine system is reduced once the starting time sequence is unreasonable. The self-adaptive start afterburning cycle engine system comprises a fuel starting valve, a fuel pump, a flow regulator, a fuel main valve, a thrust chamber, a gas generator, a gas turbine, an oxidant pump, an oxidant starting valve and a flow dividing assembly; the invention can make the starting process of the engine system have stronger self-adaptability to the starting time sequence, and besides the starting valve time sequence of the engine inlet, the starting process can be successfully completed without other starting time sequences.
Description
Technical Field
The invention relates to a rocket engine device, in particular to a self-adaptive start afterburning cycle engine system and a start method thereof.
Background
The post-combustion cycle engine system is based on a comprehensive consideration of a plurality of factors such as engine temperature, fuel supply, oxidant supply, system monitoring and control, external environmental conditions and the like, and if the starting timing design of the post-combustion cycle engine system is unreasonable or has a problem, the following consequences may be caused:
(1) Failure to start: the engine may not start successfully or the starting process may be exceptionally difficult, which may lead to delays, shut down and operational interruptions.
(2) Unstable start: the engine may not be able to maintain a steady state of operation after start-up, such that the engine may experience fluctuations, jitter, or irregular operating conditions that affect the performance and reliability of the overall system.
(3) High or low temperature problems: an unreasonable start-up sequence may result in an engine temperature that is too high or too low, which may result in thermal damage to components or incomplete combustion, and a temperature that is too low may result in unstable combustion or insufficient power.
(4) Fuel supply problem: an unreasonable start-up sequence may result in insufficient or excessive fuel supply, affecting combustion efficiency and engine performance, which may result in wasted energy, increased pollutant emissions, or fuel system damage.
(5) Oxidant supply problem: an unreasonable start-up sequence may result in an insufficient or excessive supply of oxidant, which may result in incomplete combustion, reduced power output, or engine damage.
(6) System failure: the start timing problem may cause sensor or control system failures, thereby affecting the monitoring and control of the engine state, which may lead to engine out-of-protection or failure to detect problems in time.
(7) Safety risk: unreasonable start-up sequences may increase the risk of accidents, and excessive temperatures, pressures or vibrations may cause failure, leakage or explosion of engine components.
Chinese patent CN109736953a discloses a multiple start liquid oxygen kerosene engine and starting method for gas driven pre-compression turbine, in which a plurality of valves are arranged in the engine system for smooth completion of the starting process, and the starting process involves more than 7 valve actions, and the various valve actions need to be in accordance with a certain time sequence.
Therefore, the smooth start of the existing afterburning cycle engine system depends to a large extent on the correctness of the preset start timing in the starting process, and the start success rate of the engine system is reduced if the start timing is unreasonable or deviates.
Disclosure of Invention
The invention aims to solve the defects that the starting success rate of the engine system is reduced when the starting time sequence is unreasonable in the starting process of the existing afterburning cycle engine system, and provides an afterburning cycle engine system capable of self-adaptively starting and a starting method thereof.
In order to solve the defects existing in the prior art, the invention provides the following technical solutions:
the self-adaptive starting afterburning cycle engine system is characterized in that: the device comprises a fuel starting valve, a fuel pump, a flow regulator, a fuel main valve, a thrust chamber, a gas generator, a gas turbine, an oxidant pump, an oxidant starting valve and a flow dividing assembly; the gas turbine, the oxidant pump and the fuel pump are coaxially connected;
the input end of the fuel pump is used for being connected with a fuel source through the fuel starting valve, the output end of the fuel pump is connected with the first input end of the fuel generator through the flow regulator, the output end of the fuel pump is also connected with the first input end of the thrust chamber through the fuel main valve, and the first input end of the thrust chamber is communicated with a fuel nozzle in the thrust chamber;
the flow regulator is used for stabilizing the fuel flow entering the gas generator;
the input end of the flow dividing component is connected with the output end of the fuel pump and the pipeline between the flow regulators and is used for dividing the fuel flow so as to control the working condition of the rotating speed of the engine;
the fuel main valve is in a normally open state, and the flow area of the fuel main valve is gradually increased under the action of inlet pressure;
the input end of the oxidant pump is used for being connected with an oxidant source through the oxidant starting valve, and the output end of the oxidant pump is connected with the second input end of the gas generator;
the output end of the gas generator is connected with the input end of the gas turbine, and the output end of the gas turbine is connected with the second input end of the thrust chamber.
Further, the flow dividing assembly comprises a diaphragm, a throttle ring and a flow divider which are sequentially arranged; the input end of the diaphragm is connected with a pipeline between the output end of the fuel pump and the flow regulator, and the diaphragm is used for breaking under preset pressure so as to realize the flow dividing function of the flow divider; the throttle collar is used to stabilize the fuel flow into the flow divider.
Further, the preset pressure for rupture of the diaphragm is 30% -60% of the rated working pressure.
Further, the fuel pump comprises a fuel primary pump and a fuel secondary pump which are coaxially connected, wherein the input end of the fuel primary pump is used for being connected with a fuel source through the fuel starting valve, the output end of the fuel primary pump is connected with the first input end of the gas generator through the fuel secondary pump and the flow regulator in sequence, and the output end of the fuel primary pump is also connected with the first input end of the thrust chamber through the fuel main valve; the input end of the flow dividing assembly is connected with the pipeline between the fuel secondary pump and the flow regulator.
Meanwhile, the invention also provides a starting method of the self-adaptive starting afterburning cycle engine system, which is characterized by comprising the following steps of:
step 1, before starting, keeping a fuel starting valve and an oxidant starting valve in a closed state, and respectively filling fuel and oxidant before the fuel starting valve and the oxidant starting valve; simultaneously, keeping a fuel main valve in a small-opening station state, and a flow regulator in an unregulated state, wherein a slide valve is limited at a 0 displacement position by spring force, and a flow dividing assembly is in a closed state, wherein the flow resistance of the small-opening station state is 5-100 times of that of the full-opening station state;
step 2, sequentially opening a fuel starting valve and an oxidant starting valve;
step 3, when the fuel and the oxidant are filled into the gas generator freely, spontaneous combustion is started, gas is generated to drive the gas turbine, and the working condition of the engine speed accelerates; the rotational speed in the engine rotational speed operating mode is the rotational speed of the gas turbine;
step 4, along with the rising of the engine rotating speed working condition, the fuel main valve is converted from the small-opening station state to the full-opening station state along with the rising of the pressure of the input end of the fuel main valve, and the flow dividing assembly divides the fuel flow after reaching the preset pressure, so that the engine rotating speed working condition rises at a constant speed;
step 5, after the fuel is filled into the fuel nozzle in the thrust chamber, the thrust chamber starts to ignite to build a pressure environment, and the climbing rate of the rotating speed working condition of the engine is slowed down;
and 6, when the pressure difference of medium at two ends of the sliding valve in the flow regulator overcomes the spring force, the flow regulator starts to regulate and play a role of stabilizing the flow, and then the shunt quantity of the shunt assembly reaches the shunt rated value, and under the combined action of the two, the fuel entering the gas generator is stabilized at the rated design value, so that the working condition of the engine speed is transited to the rated working condition, and the starting of the afterburning cycle engine system is completed.
Further, in step 1, the flow dividing assembly includes a diaphragm, a throttle ring, and a flow divider sequentially arranged; the input end of the diaphragm is connected with a pipeline between the output end of the fuel pump and the flow regulator; in step 4, the split assembly splits the fuel flow after reaching the preset pressure specifically as follows: the diaphragm breaks after reaching the preset pressure, and part of fuel output by the fuel secondary pump is shunted into the shunt, wherein the preset pressure is 30% -60% of rated working pressure.
Further, in step 1, the flow dividing assembly includes a diaphragm, a throttle ring, and a flow divider sequentially arranged; the input end of the diaphragm is connected with a pipeline between the output end of the fuel pump and the flow regulator; in step 6, the shunt value of the shunt assembly reaches a shunt rated value specifically: the flow divider is filled with fuel, and the volume of the flow divider and the flow resistance of the throttle ring are determined by the rated fuel flow of the gas generator and the climbing rate of the working condition of the engine speed.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention relates to a self-adaptive start afterburning cycle engine system, which comprises a fuel starting valve, a fuel pump, a flow regulator, a fuel main valve, a thrust chamber, a gas generator, a gas turbine, an oxidant pump, an oxidant starting valve and a flow dividing component, wherein the fuel main valve is arranged on the fuel starting valve; the invention can make the starting process of the engine system have stronger self-adaptability to the starting time sequence, and besides the starting valve time sequence of the engine inlet, the starting process can be successfully completed without other starting time sequences.
(2) The invention relates to a starting method of a self-adaptive starting afterburning cycle engine system, which coordinates the matching between the ignition moment of a thrust chamber and the working condition of the engine rotating speed through the flow characteristic of a main fuel valve; the existing afterburning cycle engine system mainly utilizes a normally closed fuel main valve to control the ignition time of a thrust chamber, and in the invention, the fuel main valve is in a normally open state, the flow area of the fuel main valve is gradually increased under the action of inlet pressure, and the filling process of the thrust chamber is accelerated, so that the ignition time of the thrust chamber is coupled with the working condition of the engine rotating speed, and the matching property between the ignition time and the working condition of the engine rotating speed is enhanced.
(3) The invention relates to a starting method of an after-combustion circulating engine system capable of self-adaptively starting, which controls the fuel flow entering a gas generator through a flow dividing component and a flow regulator. During start-up of an afterburning cycle engine system, one of the key links is to control the flow of fuel into the gasifier so that the peak gas temperature is below a threshold. In the invention, the flow dividing effect of the flow dividing assembly is used for inhibiting the excessively rapid increase of the fuel flow of the gas generator, and the flow regulator starts to work when the flow divider is about to be filled, so that the fuel flow of the gas generator is stabilized at a rated value, and the gas temperature in the gas generator is prevented from being excessively high due to the excessively large fuel flow.
Drawings
FIG. 1 is a schematic diagram of an adaptively crankable afterburning cycle engine system according to the present invention;
FIG. 2 is a schematic diagram of a simulated start timing for an embodiment of a method for starting an adaptively crankable afterburning cycle engine system according to the present invention;
FIG. 3 is a dimensionless rotation speed graph obtained by simulation in an embodiment of the present invention;
FIG. 4 is a graph of the flow rate of dimensionless fuel simulated in an embodiment of the present invention.
The reference numerals are explained as follows: 1-a fuel start valve; 2-a fuel primary pump; 3-a fuel two-stage pump; 4-a throttle ring; 5-a shunt; 6-a membrane; 7-a flow regulator; 8-a fuel main valve; 9-a thrust chamber; 10-a gas generator; 11-a gas turbine; 12-oxidant pump; 13-oxidant actuated valve.
Detailed Description
The invention is further described below with reference to the drawings and exemplary embodiments.
Referring to fig. 1, an adaptively startable afterburning cycle engine system includes a fuel start valve 1, a fuel pump, a flow regulator 7, a fuel main valve 8, a thrust chamber 9, a gas generator 10, a gas turbine 11, an oxidant pump 12, an oxidant start valve 13, and a split flow assembly.
The fuel pump comprises a fuel primary pump 2 and a fuel secondary pump 3, wherein the input end of the fuel primary pump 2 is connected with a fuel source through a fuel starting valve 1, the output end of the fuel primary pump 2 is connected with the first input end of a gas generator 10 through the fuel secondary pump 3 and a flow regulator 7 in sequence, the output end of the fuel primary pump 2 is also connected with the first input end of a thrust chamber 9 through a fuel main valve 8, and the first input end of the thrust chamber 9 is communicated with a fuel nozzle in the thrust chamber 9. The gas turbine 11, the oxidant pump 12, the fuel primary pump 2, and the fuel secondary pump 3 are coaxially connected.
The flow regulator 7 is used to stabilize the fuel flow into the gasifier 10.
The flow dividing assembly is used for dividing the fuel flow to control the working condition of the engine speed and comprises a diaphragm 6, a throttle ring 4 and a flow divider 5 which are sequentially arranged; the input end of the diaphragm 6 is connected with the fuel secondary pump 3 and the flow regulator 7 through pipelines, and the diaphragm 6 is used for breaking under preset pressure so as to realize the flow dividing function of the flow divider 5; the throttle collar 4 serves to stabilize the fuel flow into the flow divider 5. The volume of the flow divider 5 and the flow resistance of the throttle ring 4 are determined by the rated fuel flow of the gasifier 10 and the rate of climb of the engine speed operating mode.
The input of the oxidant pump 12 is for connection to an oxidant source via an oxidant-activated valve 13, and the output of the oxidant pump 12 is connected to a second input of the gasifier 10.
The output of the gas generator 10 is connected to the input of the gas turbine 11, and the output of the gas turbine 11 is connected to the second input of the thrust chamber 9.
The first input of the thrust chamber 9 is for inputting oxygen enriched fuel gas and the second input of the thrust chamber 9 is for inputting fuel.
The starting method of the self-adaptive start post-combustion cycle engine system comprises the following steps:
step 1, before starting, keeping the fuel starting valve 1 and the oxidant starting valve 13 in a closed state, and respectively filling fuel and oxidant before the fuel starting valve 1 and the oxidant starting valve 13; meanwhile, the fuel main valve 8 is kept in a small opening station state, the flow regulator 7 is in an unregulated state, the sliding valve is limited at a 0 displacement position by spring force, the flow dividing assembly is in a closed state, the flow resistance of the small opening station state is 5-100 times of that of the full opening station state, and the flow resistance is determined by the volume of a thrust chamber 9 behind the fuel main valve 8;
step 2, sequentially opening a fuel start valve 1 and an oxidant start valve 13;
step 3, when fuel and oxidant are filled into the gas generator 10 freely, spontaneous combustion is started, gas is generated to drive the gas turbine 11, and the engine speed is accelerated to climb; the rotational speed in the engine rotational speed condition is the rotational speed of the gas turbine 11;
step 4, along with the rising of the pressure of the input end of the main fuel valve 8, the main fuel valve 8 is changed from a small-opening station state to a full-opening station state along with the rising of the pressure of the rotating speed of the engine, and the diaphragm 6 breaks after reaching the preset pressure, part of fuel output by the secondary fuel pump 3 is shunted into the shunt 5, the preset pressure is 30% -60% of the rated working pressure, and the rotating speed of the engine rises at a constant speed;
step 5, after the fuel is filled into the fuel nozzle in the thrust chamber 9, the thrust chamber 9 starts to ignite to build a pressure environment, and the climbing rate of the engine speed working condition is slowed down;
and 6, when the pressure difference of medium at two ends of the sliding valve of the flow regulator 7 overcomes the spring force, the flow regulator 7 starts to regulate and play a role of stabilizing the flow, and then the inside of the flow divider 5 is filled with fuel, namely, the flow dividing quantity of the flow dividing component reaches a rated value, and under the combined action of the two components, the fuel entering the gas generator 10 is stabilized at a rated design value, so that the working condition of the engine speed is transited to a rated working condition, and the starting of the afterburning cycle engine system is completed.
In order to verify whether the post-combustion cycle engine system can be started smoothly, a starting process simulation model is built for the post-combustion cycle engine system, the starting time sequence of the post-combustion cycle engine system is shown in fig. 2, and a fuel starting valve 1 and an oxidant starting valve 13 are respectively opened at the time of 0 and the time of t 1; the dimensionless rotating speed curve of the gas turbine 11 is calculated as shown in figure 3 in the starting process, and the engine rotating speed working condition climbing process is proved to be rapid and stable; the calculated dimensionless fuel flow curves flowing into the gasifier 10 and the splitter 5 during the starting process are shown in fig. 4; simulation calculation results show that: the post-combustion cycle engine system provided by the invention can be started smoothly, and the starting process is insensitive to the starting time sequence.
Claims (7)
1. An adaptively startable afterburning cycle engine system characterized by: the fuel pump comprises a fuel starting valve (1), a fuel pump, a flow regulator (7), a fuel main valve (8), a thrust chamber (9), a gas generator (10), a gas turbine (11), an oxidant pump (12), an oxidant starting valve (13) and a flow dividing assembly; the gas turbine (11), the oxidant pump (12) and the fuel pump are coaxially connected;
the input end of the fuel pump is used for being connected with a fuel source through the fuel starting valve (1), the output end of the fuel pump is connected with the first input end of the gas generator (10) through the flow regulator (7), the output end of the fuel pump is also connected with the first input end of the thrust chamber (9) through the fuel main valve (8), and the first input end of the thrust chamber (9) is communicated with a fuel nozzle in the thrust chamber (9);
the flow regulator (7) is used for stabilizing the fuel flow entering the gas generator (10);
the input end of the flow dividing component is connected with the output end of the fuel pump and a pipeline between the flow regulators (7) and is used for dividing the fuel flow so as to control the working condition of the rotating speed of the engine;
the fuel main valve (8) is in a normally open state, and the flow area of the fuel main valve is gradually increased under the action of inlet pressure;
the input end of the oxidant pump (12) is used for being connected with an oxidant source through the oxidant starting valve (13), and the output end of the oxidant pump (12) is connected with the second input end of the gas generator (10);
the output end of the gas generator (10) is connected with the input end of the gas turbine (11), and the output end of the gas turbine (11) is connected with the second input end of the thrust chamber (9).
2. An adaptively startable afterburning cycle engine system as set forth in claim 1, wherein: the flow dividing assembly comprises a diaphragm (6), a throttle ring (4) and a flow divider (5) which are sequentially arranged;
the input end of the diaphragm (6) is connected with a pipeline between the output end of the fuel pump and the flow regulator (7), and the diaphragm (6) is used for breaking under preset pressure so as to realize the flow dividing function of the flow divider (5); the throttle ring (4) is used for stabilizing the fuel flow entering the flow divider (5).
3. An adaptively startable afterburning cycle engine system as set forth in claim 2, wherein: the preset pressure for rupture of the diaphragm (6) is 30% -60% of the rated working pressure.
4. An adaptively startable afterburning cycle engine system according to any one of claims 1 to 3, characterized in that: the fuel pump comprises a fuel primary pump (2) and a fuel secondary pump (3) which are coaxially connected, wherein the input end of the fuel primary pump (2) is used for being connected with a fuel source through the fuel starting valve (1), the output end of the fuel primary pump (2) is sequentially connected with the first input end of the fuel generator (10) through the fuel secondary pump (3) and the flow regulator (7), and the output end of the fuel primary pump (2) is also connected with the first input end of the thrust chamber (9) through the fuel main valve (8); the input end of the flow dividing assembly is connected with a pipeline between the fuel secondary pump (3) and the flow regulator (7).
5. A method of starting an adaptively startable afterburned cycle engine system as set forth in claim 1, comprising the steps of:
step 1, before starting, keeping a fuel starting valve (1) and an oxidant starting valve (13) in a closed state, and respectively filling fuel and oxidant before the fuel starting valve (1) and the oxidant starting valve (13); simultaneously, the fuel main valve (8) is kept in a small-opening station state, the flow regulator (7) is in an unregulated state, the sliding valve is limited at a 0 displacement position by spring force, the flow dividing assembly is in a closed state, and the flow resistance in the small-opening station state is 5-100 times of the flow resistance in the full-opening station state;
step 2, sequentially opening a fuel starting valve (1) and an oxidant starting valve (13);
step 3, when fuel and oxidant are filled into the gas generator (10) freely, spontaneous combustion is started, a gas is generated to drive the gas turbine (11), and the engine speed is accelerated to climb; the rotational speed in the engine rotational speed condition is the rotational speed of the gas turbine (11);
step 4, gradually converting the small-opening station state of the fuel main valve (8) into a full-opening station state along with the increase of the pressure of the input end of the fuel main valve (8) along with the rising of the working condition of the rotating speed of the engine, and dividing the fuel flow by the dividing component after reaching the preset pressure, wherein the working condition of the rotating speed of the engine rises at a uniform speed;
step 5, after the fuel is filled into the fuel nozzle in the thrust chamber (9), the thrust chamber (9) starts to ignite to build a pressure environment, and the climbing rate of the rotating speed working condition of the engine is slowed down;
and 6, when the pressure difference of medium at two ends of the sliding valve in the flow regulator (7) overcomes the spring force, the flow regulator (7) starts to regulate and play a role of stabilizing the flow, and then the shunt quantity of the shunt assembly reaches the shunt rated value, and under the combined action of the two, the fuel entering the gas generator (10) is stabilized at the rated design value, so that the working condition of the engine speed is transited to the rated working condition, and the starting of the afterburning cycle engine system is completed.
6. The method of starting an adaptively startable after-combustion cycle engine system as set forth in claim 5, wherein: in the step 1, the flow dividing assembly comprises a diaphragm (6), a throttle ring (4) and a flow divider (5) which are sequentially arranged; the input end of the diaphragm (6) is connected with a pipeline between the output end of the fuel pump and the flow regulator (7); in step 4, the split assembly splits the fuel flow after reaching the preset pressure specifically as follows: the diaphragm (6) breaks after reaching a preset pressure, and part of fuel output by the fuel secondary pump (3) is shunted into the shunt (5), wherein the preset pressure is 30% -60% of rated working pressure.
7. The method of starting an adaptively startable after-combustion cycle engine system as set forth in claim 5, wherein: in the step 1, the flow dividing assembly comprises a diaphragm (6), a throttle ring (4) and a flow divider (5) which are sequentially arranged; the input end of the diaphragm (6) is connected with a pipeline between the output end of the fuel pump and the flow regulator (7); in step 6, the shunt value of the shunt assembly reaches a shunt rated value specifically: the inside of the flow divider (5) is filled with fuel, and the volume of the flow divider (5) and the flow resistance of the throttle ring (4) are determined by the rated fuel flow of the gas generator (10) and the climbing rate of the engine speed working condition.
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| CN202310726656.0A CN116480488A (en) | 2023-06-19 | 2023-06-19 | Self-adaptive starting afterburning cycle engine system and starting method thereof |
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| CN202310726656.0A CN116480488A (en) | 2023-06-19 | 2023-06-19 | Self-adaptive starting afterburning cycle engine system and starting method thereof |
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| CN115288884A (en) * | 2022-06-27 | 2022-11-04 | 西安航天动力研究所 | Self-ignition propellant oxygen-enriched afterburning cycle self-starting engine system and method |
| CN115324773A (en) * | 2022-10-13 | 2022-11-11 | 中国人民解放军63921部队 | Full open expansion cycle engine |
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