CN111520234A - Starting device and method for helicopter engine in plateau environment - Google Patents
Starting device and method for helicopter engine in plateau environment Download PDFInfo
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- CN111520234A CN111520234A CN202010363940.2A CN202010363940A CN111520234A CN 111520234 A CN111520234 A CN 111520234A CN 202010363940 A CN202010363940 A CN 202010363940A CN 111520234 A CN111520234 A CN 111520234A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/26—Starting; Ignition
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- Combustion & Propulsion (AREA)
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- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention belongs to the helicopter design technology, and particularly relates to a starting device and a starting method for a helicopter engine in a plateau environment. The invention relates to a plateau environment helicopter engine starting method, which comprises the steps of selecting an auxiliary power device to generate power to provide starting energy for a helicopter engine, triggering an auxiliary power device electronic controller when the engine is started, outputting a larger current to a fuel servo control device instantly by the auxiliary power device electronic controller, controlling the fuel servo control device to compensate fuel flow for the auxiliary power device, and reducing rotating speed fluctuation. The invention optimizes the starting technology of the helicopter engine, provides the improved scheme of the starting energy source of the helicopter engine, has simple and convenient operation and convenient implementation, improves the power input capability and the adjusting performance of the starting of the engine through the use verification of the plateau and low-temperature environment, has reliable functions and performance, and solves the technical problem of difficult starting of the helicopter engine in the prior art in the plateau, high-altitude and low-temperature environment.
Description
Technical Field
The invention belongs to the helicopter design technology, and particularly relates to a starting device and an optimization method for a plateau environment helicopter engine.
Background
The land is wide in the breadth of our country, the terrain is complex, the average altitude is 4000m in the Qinghai-Tibet plateau, the area is as high as 240 kilo square kilometers, and the land occupies one of the territorial areas. The plateau area has thin air, low atmospheric pressure and density and severe oxygen deficiency. The research on plateau helicopters, particularly plateau alpine starting and related systems of engines, is always an important direction for the research on helicopters.
In the environment of plateau and low temperature, the phenomenon of starting overtemperature or starting suspension is easy to occur when the helicopter engine is started, so that the starting failure of the engine or the success rate of starting is seriously reduced, and the attendance of the helicopter task is influenced. The turboshaft engine mounted on the helicopter completes the simulation starting test of environments such as high altitude, low temperature and the like on the stand of the helicopter, completes the starting capability assessment of real environment and the starting technology optimization of the plateau helicopter, and ensures the use capability of the plateau helicopter.
Before the starting technology is optimized, a helicopter engine is started by directly adopting a storage battery or by adopting an auxiliary power device for power generation, for example, the storage battery is used for power generation starting as provided by RU2018142889, but the starting procedure is not perfect, and various technical problems cannot meet the use requirements of plateau helicopters. If the storage battery can not guarantee the starting energy requirement of the engine in the high and low temperature environment, the auxiliary power device is easy to have the condition of under-frequency or over-frequency protection of the generator caused by large rotation speed fluctuation, the compressor is easy to surge and start over-temperature caused by the heat accumulated by an air inlet (particularly when the sand prevention device is used) when the engine is started in a hot mode, and the starting suspension is caused by the overlarge load of the helicopter when the engine is started in a cold mode.
According to troubleshooting and data analysis of an engine starting test of a certain plateau helicopter under the combined conditions of plateau, low temperature and two environments, the form and regulation control of an engine starting energy source are optimized, and an engine starting control program is optimized.
Disclosure of Invention
The purpose of the invention is as follows: a starting optimization method for a helicopter engine in a plateau environment is provided.
The technical scheme of the invention is as follows: the utility model provides a plateau environment helicopter engine starting device, includes starter motor, hardware compensation system and engine starting switch, wherein, hardware compensation system includes auxiliary power device electronic controller, fuel servo control device, auxiliary power device, engine starting switch connects starter motor and auxiliary power control electronic controller respectively, and auxiliary power control electronic controller connects fuel servo control device, fuel servo control device and provides the pipe connection of fuel for auxiliary power device, auxiliary power device connects starter motor, and starter motor connects the helicopter engine.
The plateau environment helicopter engine starting method based on the plateau environment helicopter engine starting device comprises the steps of selecting an auxiliary power device to generate power to provide starting energy for a helicopter engine, triggering an auxiliary power device electronic controller when the engine is started, outputting larger current to a fuel oil servo control device instantly by the auxiliary power device electronic controller, controlling the fuel oil servo control device to compensate fuel oil flow for the auxiliary power device, and reducing rotating speed fluctuation.
When the engine is started, the impedance of the engine starter is reduced, the auxiliary change of the auxiliary power device is reduced, and the electronic controller of the auxiliary power device controls the current of the fuel servo control device to be reduced to a normal value.
And the single cold-rotating time is prolonged when the engine is controlled to be in cold-rotating, and the single cold-rotating time is at least 20 seconds.
One to two cold revolutions are performed before the hot start of the engine in the plateau environment.
And before the cold start of the first engine is carried out in a plateau and low-temperature environment, the tail rotor is subjected to disc rotation for at least 20 revolutions.
When the suspension phenomenon occurs in the starting process, the mode switch of the engine is firstly switched to a manual position and then switched back to an automatic position.
The invention has the beneficial effects that:
a) the invention solves the problem of difficult starting of the helicopter engine under the combined conditions of plateau, low temperature and two environments by the engine starting optimization technology.
b) The engine starting energy source optimization improvement scheme provided by the invention improves the safety and the control performance of the starting energy source.
c) The optimized improvement scheme of the starting control program improves the starting capability of the engine in severe environment in a use method, and is convenient to operate and implement.
Drawings
FIG. 1 is a schematic structural diagram of a starting device of a helicopter engine in a plateau environment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the starting device for the helicopter engine in plateau environment of the present invention includes a starting motor, a hardware compensation system and an engine starting switch. The hardware compensation system comprises an auxiliary power device electronic controller, a fuel oil servo control device and an auxiliary power device, wherein an engine starting switch is respectively connected with a starting motor and the auxiliary power control electronic controller, the auxiliary power control electronic controller is connected with the fuel oil servo control device and is connected with a pipeline for supplying fuel oil to the auxiliary power device, the auxiliary power device is connected with the starting motor, and the starting motor is connected with a helicopter engine.
The plateau environment helicopter engine starting optimization method is based on the plateau environment helicopter engine starting device, the auxiliary power device is selected to generate power to provide starting energy for the helicopter engine, when the engine is started, the auxiliary power device electronic controller is triggered at the same time, the auxiliary power device electronic controller instantly outputs larger current to the fuel servo control device, the fuel servo control device is controlled to compensate fuel flow for the auxiliary power device, and rotating speed fluctuation is reduced. When the engine is started, the impedance of the engine starter is reduced, the auxiliary change of the auxiliary power device is reduced, and the electronic controller of the auxiliary power device controls the current of the fuel servo control device to be reduced to a normal value.
In specific implementation, the plateau environment helicopter engine starting optimization method optimizes the engine starting operation through the form and regulation control of the engine starting energy source. The auxiliary power device is an electric single-rotor gas turbine engine, the power of an output shaft drives an alternating current generator, and the alternating current generator provides energy required by starting the engine. The auxiliary power device is an electric auxiliary device, generates electricity by using fuel oil, has large output power, is far greater than the power which can be provided by an airborne storage battery, can reach 80kW, can meet the power required by the engine when the engine is started in severe environments such as plateau, high and cold and the like, and has sufficient energy storage compared with the storage battery on the existing helicopter starter. Meanwhile, the electric auxiliary device has long working time, can provide energy required by multiple times of starting or cold rotation, and meets the requirements of long plateau starting and cold rotation time, multiple times of cold rotation, multiple starting and the like of the engine. In addition, the power required by the electric auxiliary device for starting the engine is greatly reduced, the requirement of an onboard storage battery can be effectively reduced, and the safety of engine starting energy can be improved.
A direct current motor is adopted in a helicopter engine starter in a plateau environment, instantaneous current impedance generated during starting is high, the load of an auxiliary power device is increased instantaneously, the rotating speed of the auxiliary power device and an alternating current motor thereof is reduced, so that abnormal power failure and engine starting failure of the alternating current motor are caused due to under-frequency protection. Therefore, the hardware compensation circuit is added in the controller of the auxiliary power device, forms a hardware compensation system with the electronic controller of the auxiliary power device, the fuel servo control device and the auxiliary power device, and realizes linkage with the engine starting system under the control of the engine starting switch. The hardware compensation circuit can be realized by adopting a conventional feedback compensation circuit, and can reduce the rotation speed fluctuation of the auxiliary power device when the engine is started by controlling hardware execution mechanisms such as a fuel oil servo control device and the like through current output. When the starting command of the engine is triggered by the starting switch of the engine, the hardware compensation circuit in the controller of the auxiliary power device is triggered, the current of the fuel oil servo control device is increased, the instantaneous fuel oil supply is increased, and the fluctuation of the rotating speed is reduced. The impedance of the engine starter is reduced, the auxiliary change of the auxiliary power device is reduced, and the current of the fuel servo control device is reduced to a normal value.
In addition, when the engine is started, the method optimizes and improves the cold rotation control of the engine, prolongs the single cold rotation time, needs to perform one to two cold rotations before the engine is started in a specific plateau environment, and prolongs the single cold rotation time from 15 seconds to at least 20 seconds, so that the heat accumulated by an air inlet channel can be effectively absorbed, the surge of a gas compressor and the over-temperature starting of the engine during the hot starting of the engine are avoided, and the success rate of starting the engine in the plateau and low-temperature environment is improved.
Before cold starting of the first engine in plateau and low-temperature environment, the tail rotor can be rotated by at least 20 revolutions, and starting suspension caused by overlarge load of the helicopter during cold starting of the engine is avoided.
When the suspension phenomenon occurs in the starting process, the engine mode selection switch on the control panel of the helicopter engine is switched to the manual position and then switched back to the automatic position, so that the problem of slow starting acceleration can be solved, and the success of starting can be ensured.
In conclusion, the invention optimizes the starting technology of the helicopter engine, provides the improved scheme of the starting energy source of the helicopter engine, improves the power input capability and the adjusting performance of the starting of the engine, and has reliable functions and performance. By optimizing the starting energy source and the starting operation program of the helicopter engine, the provided starting operation program is simple and convenient to operate and convenient to implement, solves the problems that the plateau helicopter cannot be improved by a system in the starting process, improves the adaptability of the helicopter in the plateau and low-temperature environment, solves the technical problem that the helicopter engine in the prior art is difficult to start in the plateau, high-altitude and low-temperature environment through the use verification of the plateau and low-temperature environment, and has greater technical progress and prominent technical effect compared with the prior art.
The foregoing is merely a detailed description of the embodiments of the present invention, and some of the conventional techniques are not detailed. The scope of the present invention is not limited thereto, and any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present invention will be covered by the scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The utility model provides a plateau environment helicopter engine starting device, its characterized in that, includes starter motor, hardware compensation system and engine starting switch, wherein, hardware compensation system includes auxiliary power device electronic controller, fuel servo control device, auxiliary power device, engine starting switch connects starter motor and auxiliary power control electronic controller respectively, and auxiliary power control electronic controller connects fuel servo control device, fuel servo control device and provides the pipe connection of fuel for auxiliary power device, auxiliary power device connects starter motor, and starter motor connects the helicopter engine.
2. A plateau environment helicopter engine starting method based on the plateau environment helicopter engine starting device of claim 1 is characterized in that an auxiliary power device is selected to generate power to provide starting energy for the helicopter engine, when the engine is started, an auxiliary power device electronic controller is triggered at the same time, the auxiliary power device electronic controller outputs larger current to the fuel servo control device instantly, and the fuel servo control device is controlled to compensate fuel flow for the auxiliary power device, so that rotation speed fluctuation is reduced.
3. The plateau environment helicopter engine starting method of claim 2, characterized in that after the engine is started, the engine starter impedance is reduced, the auxiliary power unit auxiliary variation is reduced, and the auxiliary power unit electronic controller controls the fuel servo control unit current to be reduced to a normal value.
4. The method of starting a helicopter engine in a plateau environment of claim 3, wherein the helicopter engine employs a DC motor and the auxiliary power device employs an AC motor.
5. The plateau environment helicopter engine starting method of claim 4, wherein the single cold-turn time is lengthened for engine cold-turn control, and the single cold-turn time is at least 20 seconds.
6. The plateau environment helicopter engine starting method of claim 5, characterized by the plateau environment performing one to two cold revolutions before the engine hot start.
7. The method of starting a helicopter engine in a plateau environment of claim 6 wherein the tail rotor is turned at least 20 revolutions before the cold start of the first engine in a plateau, low temperature environment.
8. The plateau environment helicopter engine starting method of claim 7, characterized by that when a hang-up phenomenon occurs during starting, the engine mode switch is first toggled to the "manual" position and then switched back to the "automatic" position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010363940.2A CN111520234A (en) | 2020-04-30 | 2020-04-30 | Starting device and method for helicopter engine in plateau environment |
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| CN202010363940.2A CN111520234A (en) | 2020-04-30 | 2020-04-30 | Starting device and method for helicopter engine in plateau environment |
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| CN202010363940.2A Pending CN111520234A (en) | 2020-04-30 | 2020-04-30 | Starting device and method for helicopter engine in plateau environment |
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Cited By (1)
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| CN111997761A (en) * | 2020-08-25 | 2020-11-27 | 中国航空工业集团公司沈阳飞机设计研究所 | Method and system for improving plateau starting success rate of aeroengine |
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Application publication date: 20200811 |
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