Method for optimizing the speed of a twin-spool turbojet engine fan, and architecture for implementing same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F04D-025/00
F02C-003/113
F02C-007/36
F02K-003/06
출원번호
US-0005471
(2012-03-15)
등록번호
US-9726186
(2017-08-08)
우선권정보
FR-11 52209 (2011-03-17)
국제출원번호
PCT/FR2012/050547
(2012-03-15)
§371/§102 date
20131118
(20131118)
국제공개번호
WO2012/123684
(2012-09-20)
발명자
/ 주소
Masson, Richard
Dunleavy, Patrick
Serey, Jean-Pierre
출원인 / 주소
SNECMA
대리인 / 주소
Oblon, McClelland, Maier & Neustadt, L.L.P.
인용정보
피인용 횟수 :
2인용 특허 :
4
초록▼
A method and system improving energy efficiency of a turbojet engine by optimizing rotating speed of a fan and operability of an engine, by freeing the fan from exclusive control of a low-pressure (LP) shaft by providing combined control with a high-pressure (HP) shaft when cruising power has been r
A method and system improving energy efficiency of a turbojet engine by optimizing rotating speed of a fan and operability of an engine, by freeing the fan from exclusive control of a low-pressure (LP) shaft by providing combined control with a high-pressure (HP) shaft when cruising power has been reached. The turbojet engine include at least one LP turbine and one HP turbine coupled to coaxial LP shafts and HP shafts, respectively, which can drive LP and HP compressors, respectively. The LP compressors include a fan that forms a first primary air-intake compression stage. The LP and HP shafts are mounted on one of two driving mechanisms, an inner ring gear, and a planet carrier for a planetary gear train for driving the fan, the HP shaft being mounted on a disengagement mechanism and the fan being coupled to the planetary gear train via an outer driven ring gear.
대표청구항▼
1. A method for optimizing rotational speeds of an at least two-flow and twin-spool turbofan engine, comprising at least one low pressure (LP) compressor/turbine assembly and one high pressure (HP) compressor/turbine assembly respectively comprising coaxial LP and HP transmission shafts for transmit
1. A method for optimizing rotational speeds of an at least two-flow and twin-spool turbofan engine, comprising at least one low pressure (LP) compressor/turbine assembly and one high pressure (HP) compressor/turbine assembly respectively comprising coaxial LP and HP transmission shafts for transmitting power from a turbine to the compressor of the assembly, and in which a fan forms a first primary air intake compression stage, the method comprising: providing a planetary gear train for driving the fan, the planetary gear train including driving means and driven means, and the HP transmission shaft being engageable and disengagable with the driving means of the planetary gear train;at a first operating condition, engaging the HP transmission shaft such that the fan is driven by the LP transmission shaft and the HP transmission shaft; andat a second operating condition, disengaging the HP transmission shaft such that the fan is driven only by the LP transmission shaft. 2. An optimization method according to claim 1, wherein the first operating condition is when the turbofan engine is at cruising power. 3. An optimization method according to claim 1, wherein the second operating condition is a flight phase outside cruising power. 4. An optimization method according to claim 1, wherein the HP transmission shaft is engageable and disengagable with the driving means of the planetary gear train via a friction clutch. 5. An optimization method according to claim 1, wherein the LP transmission shaft and the HP transmission shaft are connected to the driving means of the planetary gear train and the fan is connected to the driven means of the planetary gear train. 6. A turbofan engine architecture comprising: at least one low pressure (LP) turbine and one high pressure (HP) turbine coupled respectively to coaxial LP and HP transmission shafts capable respectively of driving LP and HP compressors, the LP compressors comprising a fan forming a first primary air intake compression stage;a planetary gear train for driving the fan, the planetary gear train including driving means and driven means; anddisengagement means which engage and disengage the HP transmission shaft with the driving means of the planetary gear train,wherein, in a first operating condition, the HP transmission shaft is engaged such that the fan is driven by the LP transmission shaft and the HP transmission shaft, andwherein, in a second operating condition, the HP transmission shaft is disengaged such that the fan is driven only by the LP transmission shaft. 7. A turbofan engine architecture according to claim 6, wherein the driving means includes an inner ring gear of the planetary gear train and a planet carrier of the planetary gear train, and the fan is connected to a driven outer ring gear of the planetary gear train. 8. A turbofan engine architecture according to claim 7, wherein the disengagement means is mounted between an HP engine shaft portion connected to the HP turbine and an HP drive shaft portion capable of driving the fan via the driving means of the planetary gear train. 9. A turbofan engine architecture according to claim 7, wherein diameters of the driving means in relation to a diameter of the driven outer ring gear, are determined such that the outer ring gear can be driven by the planetary gear train at pre-established speeds depending on speed reduction ratios between a speed of the driven outer ring gear connected to the fan, and that resulting from the driving means connected to the LP transmission shaft or connected to the LP transmission shaft and the HP transmission shaft. 10. A turbofan engine architecture according to claim 8, wherein the HP transmission shaft portion is mounted on the inner ring gear and the LP transmission shaft is mounted on the planet carrier. 11. A turbofan engine architecture according to claim 10, wherein an LP drive shaft portion is mounted on the inner ring gear and the HP transmission shaft is mounted on the planet carrier, the planetary gear train being mounted, on an axis of symmetry, in an opposite manner to that corresponding to a mounting of the HP transmission shaft portion. 12. A turbofan engine architecture according to claim 8, wherein the driving means connected to the HP transmission shaft includes locking means for stopping the driving means when the HP transmission shaft is disengaged. 13. A turbofan engine architecture according to claim 6, wherein the LP transmission shaft and the HP transmission shaft are connected to the driving means of the planetary gear train and the fan is connected to the driven means of the planetary gear train. 14. A turbofan engine architecture according to claim 6, wherein the disengagement means include a friction clutch.
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이 특허에 인용된 특허 (4)
Ciokajlo John J. (Cincinnati OH) O\Brien Michael T. (Cincinnati OH), Air-start assembly and method.
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