Aircraft engine ignition device

FIELD: engines and pumps.

SUBSTANCE: engine ignition device comprises at least two spark plugs, a power supply source, a first channel for supply of a first spark plug and a second channel for supply of a second spark plug. Said channels are connected to the power supply source via power distribution means controlled by control system of FADEC type. Said distribution means comprise a first circuit for alternate feed of said first channel or said second channel and a second circuit for simultaneous feed of said first and second channels. The device is designed to use either the first circuit or the second circuit during the start-up.

EFFECT: increased reliability of engine start-up.

12 cl, 2 dwg

 



 

Same patents:

FIELD: engines and pumps.

SUBSTANCE: ignition method of gas turbine engine (11) by means of use of ignition plug (1) containing the first electrode, the second electrode and a semiconductor element between the first electrode and the second electrode. The semiconductor element has an exposed surface. The ignition method involves a stage of formation of a spark near the above said exposed surface by application of a difference of potentials, which exceeds the first pre-set threshold, between the first electrode and the second electrode. Before the above said stage of spark formation, it also involves a pre-heating stage consisting in application of a potentials difference that is lower than the second pre-set threshold, between the first electrode and the second electrode. The above second pre-set threshold is lower than the above said first pre-set threshold.

EFFECT: achievement of drying of a plug from ice or water, which cover the exposed surface of the semiconductor element, due to heat released from leakage current that flows through the semi-conductor element, at supply of low voltage between two electrodes without causing any spark formation.

10 cl, 5 dwg

FIELD: engines and pumps.

SUBSTANCE: ignition system comprises a spark plug of semiconductor type in a shell, a tube rigidly connected with a combustion chamber of a gas turbine engine, a movable bushing and facilities for air direction for cooling of a spark plug semiconductor. The movable bushing provides for installation of a spark plug into the tube and perceives expansion of the spark plug perpendicular to its axis. The movable bushing comprises a cylindrical part, forming a circular cavity of the bushing with the spark plug for circulation of cooling air. The shell and semiconductor at its ends at the side of the combustion chamber form a circular cavity of the spark plug. The shell comprises holes in the area of the specified circular cavity of the spark plug, communicating with the circular cavity of the bushing, and holes on its surface facing the combustion chamber. Other inventions of the group relate to a combustion chamber, comprising the above ignition system, and a gas turbine engine, comprising such combustion chamber.

EFFECT: inventions make it possible to increase service life of a semiconductor spark plug.

4 cl, 3 dwg

FIELD: power industry.

SUBSTANCE: combustion system provides for continuous charging/discharging cycles of a storage capacitor with generation of spark discharges in a spark gap of a plug at the first time interval with increased frequency, and at the next time interval, till failure of power supply to the ignition system, with reduced frequency in comparison to the first time interval; at that, to the first time interval together with the beginning of power uploading to the storage capacitor there reduced is the voltage specified for the second time interval; in addition, the third time interval is introduced, during which strength of power pumping to the storage capacitor is reduced in comparison to the second time interval.

EFFECT: invention allows shortening the recovery time of the engine changeover to normal mode, improving reliability of support of fuel-air mixture combustion in the combustion chamber at operation of the engine under adverse weather conditions.

1 dwg

FIELD: machine building.

SUBSTANCE: device for pulse ignition of combustible mixture includes a housing with a combustion chamber located in it, a fuel atomiser, an ignition source and an air supply channel. In addition, the device includes a mixing channel connected to the fuel atomiser and the air supply channel. The latter is equipped at the outlet with an airflow rate control. Connection of the mixing channel with the fuel atomiser has the possibility of supplying fuel jets perpendicular to the air flow. A spray nozzle is installed at the mixing channel outlet. The combustion chamber is enveloped with a cooling air jacket connected through the air supply channel to the mixing channel and has several ignition sources equally spaced throughout its length. A convergent conical tube ending with a nozzle is installed at the combustion chamber outlet.

EFFECT: invention allows performing reliable ignition of combustible mixture.

5 cl, 3 dwg

FIELD: engines and pumps.

SUBSTANCE: proposed device is located inside combustion chamber arranged in housing and having YY axis. Proposed device comprises channel with XX axis and plug moving guide to respond to expansions originating in axis perpendicular to channel XX axis. Besides, it comprises channel guide and means to incline said channel guide relative to XX axis. Plug guide is arranged in channel guide. Channel guide inclination variation allows varying chamber inclination relative to XX axis. Channel guide inclination variation allows varying chamber inclination relative to XX axis.

EFFECT: ruled out plug wear, longer life.

10 cl, 4 dwg

FIELD: engines and pumps.

SUBSTANCE: power is pumped into reservoir capacitor from power supply to switch the power of the latter to ignition plug spark gap. Note here that spark discharge is generated in plug gap to ignite fuel-air mix in gas turbine engine combustion chamber. Reservoir capacitor charge-discharge continuous cycles are produced to initiate spark discharge in spark gap during first time interval at increased frequency by increasing power pumping to said capacitor during said time interval. While during the next time interval, said cycles are produced prior to terminating power feed to ignition system, at decreased frequency compared to said first interval.

EFFECT: higher reliability of engine anti-surge start, decreased time of engine acceleration.

1 dwg

FIELD: engines and pumps.

SUBSTANCE: proposed igniter comprises ignition plug and its case to make cooling chamber. Said case comprises inlet and outlet openings. Said inlet opening communicating case outer surface with aforesaid cooling chamber is located between combustion chamber outer casing and fire tube case on engine compressor side. Case end face is jointed with ignition plug work end. Said outlet openings are made on case end parallel with plug axis opposite inlet opening. Relation of outlet opening spacing to its diameter makes, at least, three.

EFFECT: better starting, decreased weight and dimensions.

3 dwg

FIELD: engines and pumps.

SUBSTANCE: air is fed from compressor into combustion chamber. Air is fed from combustion chamber secondary circuit into clearance between ignition plug and special sleeve arranged between combustion chamber outer casing and fire tube casing. Air is fed from clearance between special sleeve and ignition plug into fire tube inner chamber in parallel with plug axis via special sleeve work end. Electric discharge is initiated at ignition plug work end and fuel sprayed by nozzle is fed to plug work end. Air from aforesaid clearance is fed into fire tube only from special sleeve work end one side facing engine turbine, perpendicular to fuel-mix direction in the area of ignition plug.

EFFECT: higher reliability, decreased weight and dimensions.

6 dwg

FIELD: electrical engineering.

SUBSTANCE: proposed spark plug comprises cylindrical body 1, circular spark-producing element 7 with working surface 8, central electrode 4 and two coaxial isolators 2, 3. Contact collar 6 is made on working face of cylindrical body 1. Central electrode 4 has disk contact 5. Contact collar 6 and disk contact 5 are furnished with circular contact ledges 11, 12. The latter are oriented toward working surface 8 of circular spark-producing element 7. Spark producing element 7 is spring loaded via coaxial isolators 2, 3 to contact collar 6 and disk contact 5. Springs 16, 17 are arranged on opposite side of working face of cylindrical body 1. Dielectric gaps are arranged between cylindrical body 1, circular spark producing element 7 and central electrode 4.

EFFECT: higher reliability, better thermal stability.

1 dwg

FIELD: engines and pumps.

SUBSTANCE: proposed igniter as arranged inside a sleeve, its end face being provided with an orifice aligned with its inner space and communicating the aforesaid space with turbine combustion chamber. Note that the said sleeve is furnished with an extra space arranged inside the sleeve casing provided with an orifice communicating the said extra space with the sleeve outer surface facing the combustion chamber inlet. Note that the sleeve casing is furnished additionally with, at least, one orifice communicating the said extra space with the sleeve inner space and orifices communicating the extra space with the space formed by the coaxial orifice in the sleeve working end face and the combustion chamber walls on the sleeve working end face side. The igniter spark plug body is made stepwise, the transition from the greater to smaller diameters being made perpendicular to the plug and sleeve axes. The smaller-diameter plug surface is arranged in the sleeve end face orifice. The said plug working end face is arranged between the sleeve working end face inner and outer surfaces. The orifices communicating the extra space with sleeve working end face orifice communicate also with the annular gap formed by the smaller-diameter plug body and the sleeve working end face orifice aligned with the latter.

EFFECT: higher reliability of starting aircraft gas turbine engines.

5 dwg

FIELD: mechanical engineering; gas-turbine engines.

SUBSTANCE: in process of operation of starting torch igniter of combustion chamber of gas-turbine engine, air is delivered into igniter combustion chamber along its walls in direction to nozzle. Simultaneously additional air jet is fed into igniter combustion chamber in direction of flame throw-over device under supercritical pressure differential, and ratio of rate of air jet to summary air rate through igniter should be equal to or less than 0.24. Invention makes it possible to create flame torch pulsating at frequency equal to ignition frequency and to eliminate separate long flame-outs.

EFFECT: provision of reliable starting of gas-turbine engine.

1 dwg

Spark plug // 2277278

FIELD: ignition systems for gas-turbine engines of aircraft and overland vehicles.

SUBSTANCE: proposed spark plug has body accommodating central electrode and side electrode in the form of bushing with central cylindrical passage, as well as shell enclosing this body to form cooling area provided with deflector and outlet port. Side-electrode walls have holes tangential to side surface of its passage which communicate at inlet with air space between body and shell. There may be 1 to 5 holes. Ratio of cross-sectional area of central cylindrical passage to total area of tangential holes is 30 to 250. Such design of spark plug provides for eliminating fuel carbonization and soot accumulation on inner surface of side-electrode cylindrical passage.

EFFECT: enhanced reliability and improved starting characteristics of spark plug.

1 cl, 2 dwg

FIELD: aircraft gas-turbine engines.

SUBSTANCE: invention relates to device for lighting up combustion chambers of aircraft gas-turbine engine and it can be used also in ignition systems of stationary gas-turbine plants or other electrical equipment enclosed in sealed shell. Proposed capacitive set contains sealed shell and electric elements. Sealed shell is formed by housing provided with supply connector and high-voltage terminal and cover hermetically connected with housing. Electric circuit elements are installed on bottom of housing in hardened foam plastic filling free space between elements. Gaseous medium inside shell of set is under pressure lower than pressure of atmospheric air.

EFFECT: increased heat resistance of capacitive ignition sets at preservation of higher vibration strength.

2 dwg

FIELD: aircraft engine manufacture; devices for kindling gas-turbine engine combustion chambers.

SUBSTANCE: proposed surface-discharge spark plug for low-voltage capacitive ignition system has spark-producing insulator, central electrode with contact, body whose butt-end part forms side electrode, additional insulator, and contact between body side electrode and butt-end surface of spark-producing insulator installed in body. Spark-producing insulator is made of high-alumina ceramics of following composition, %: Al2O3 (aluminum oxide), >94.0; SiO2 (silicon dioxide, 4.3; CaO (calcium oxide), 1.63. Central electrode with contact is disposed in internal duct of spark-producing insulator. Side and central electrodes form annular spark gap on butt-end surface of spark-producing insulator. Additional insulator is disposed in annular gap between spark-producing insulator and body on side opposing working end of spark-gap plug. At least one of electrode contacts is made of enhanced heat resistance alloy that has in its composition 80% of silver and 20% of palladium. Surface layer of spark-producing insulator provided in vicinity of spark gap and where it is mating electrode contacts has in its composition Al2SiO3, Ag, CuO, Mn3O4, CuMn2O4, and CuAl2O.

EFFECT: enhanced service life and heat resistance of spark plug.

1 cl, 1 dwg

FIELD: aircraft engineering; gas-turbine engines.

SUBSTANCE: according to proposed method design elements of electric circuit are secured on bottom of igniter body with sealed supply connector and high voltage terminal. Then free space between design elements is filled up with powder-like foam plastic and foam plastic is foamed and solidified by heating igniter body. Then cover of igniter is hermetically mounted over perimeter of body. Sealing of body is provided at temperature of gaseous medium enclosed between surface of foam plastic and cover equal to 120-125°C.

EFFECT: improved stability of foam plastic enclosed in sealed body of igniter.

2 dwg

FIELD: engines and pumps.

SUBSTANCE: proposed igniter as arranged inside a sleeve, its end face being provided with an orifice aligned with its inner space and communicating the aforesaid space with turbine combustion chamber. Note that the said sleeve is furnished with an extra space arranged inside the sleeve casing provided with an orifice communicating the said extra space with the sleeve outer surface facing the combustion chamber inlet. Note that the sleeve casing is furnished additionally with, at least, one orifice communicating the said extra space with the sleeve inner space and orifices communicating the extra space with the space formed by the coaxial orifice in the sleeve working end face and the combustion chamber walls on the sleeve working end face side. The igniter spark plug body is made stepwise, the transition from the greater to smaller diameters being made perpendicular to the plug and sleeve axes. The smaller-diameter plug surface is arranged in the sleeve end face orifice. The said plug working end face is arranged between the sleeve working end face inner and outer surfaces. The orifices communicating the extra space with sleeve working end face orifice communicate also with the annular gap formed by the smaller-diameter plug body and the sleeve working end face orifice aligned with the latter.

EFFECT: higher reliability of starting aircraft gas turbine engines.

5 dwg

FIELD: electrical engineering.

SUBSTANCE: proposed spark plug comprises cylindrical body 1, circular spark-producing element 7 with working surface 8, central electrode 4 and two coaxial isolators 2, 3. Contact collar 6 is made on working face of cylindrical body 1. Central electrode 4 has disk contact 5. Contact collar 6 and disk contact 5 are furnished with circular contact ledges 11, 12. The latter are oriented toward working surface 8 of circular spark-producing element 7. Spark producing element 7 is spring loaded via coaxial isolators 2, 3 to contact collar 6 and disk contact 5. Springs 16, 17 are arranged on opposite side of working face of cylindrical body 1. Dielectric gaps are arranged between cylindrical body 1, circular spark producing element 7 and central electrode 4.

EFFECT: higher reliability, better thermal stability.

1 dwg

FIELD: engines and pumps.

SUBSTANCE: air is fed from compressor into combustion chamber. Air is fed from combustion chamber secondary circuit into clearance between ignition plug and special sleeve arranged between combustion chamber outer casing and fire tube casing. Air is fed from clearance between special sleeve and ignition plug into fire tube inner chamber in parallel with plug axis via special sleeve work end. Electric discharge is initiated at ignition plug work end and fuel sprayed by nozzle is fed to plug work end. Air from aforesaid clearance is fed into fire tube only from special sleeve work end one side facing engine turbine, perpendicular to fuel-mix direction in the area of ignition plug.

EFFECT: higher reliability, decreased weight and dimensions.

6 dwg

FIELD: engines and pumps.

SUBSTANCE: proposed igniter comprises ignition plug and its case to make cooling chamber. Said case comprises inlet and outlet openings. Said inlet opening communicating case outer surface with aforesaid cooling chamber is located between combustion chamber outer casing and fire tube case on engine compressor side. Case end face is jointed with ignition plug work end. Said outlet openings are made on case end parallel with plug axis opposite inlet opening. Relation of outlet opening spacing to its diameter makes, at least, three.

EFFECT: better starting, decreased weight and dimensions.

3 dwg

FIELD: engines and pumps.

SUBSTANCE: power is pumped into reservoir capacitor from power supply to switch the power of the latter to ignition plug spark gap. Note here that spark discharge is generated in plug gap to ignite fuel-air mix in gas turbine engine combustion chamber. Reservoir capacitor charge-discharge continuous cycles are produced to initiate spark discharge in spark gap during first time interval at increased frequency by increasing power pumping to said capacitor during said time interval. While during the next time interval, said cycles are produced prior to terminating power feed to ignition system, at decreased frequency compared to said first interval.

EFFECT: higher reliability of engine anti-surge start, decreased time of engine acceleration.

1 dwg

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