Device for determining an aerodynamic flow along a wall and controlling a profile of the wall
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01P-005/10
B64D-043/02
출원번호
US-0263834
(2010-04-12)
등록번호
US-8959993
(2015-02-24)
우선권정보
FR-09 01792 (2009-04-10)
국제출원번호
PCT/EP2010/054775
(2010-04-12)
§371/§102 date
20120305
(20120305)
국제공개번호
WO2010/116004
(2010-10-14)
발명자
/ 주소
Guichard, Philippe
Rondeau, Philippe
출원인 / 주소
Thales
대리인 / 주소
Baker & Hostetler LLP
인용정보
피인용 횟수 :
0인용 특허 :
4
초록▼
A device for characterizing the nature of an aerodynamic stream along a wall, the device including multiple temperature-sensitive optical nodes of Bragg grating type distributed along an optical fiber. The device determining the variations in speed of the aerodynamic stream. The nodes are distribute
A device for characterizing the nature of an aerodynamic stream along a wall, the device including multiple temperature-sensitive optical nodes of Bragg grating type distributed along an optical fiber. The device determining the variations in speed of the aerodynamic stream. The nodes are distributed along a fiber placed substantially following the route of a streamline, and the device processing so as to differentiate the temporal and spatial characteristics of the signals of thermal flowrate among the nodes.
대표청구항▼
1. A device to determine characteristics of an aerodynamic stream along a wall, the device comprising: a plurality of temperature-sensitive optical nodes distributed along an optical fiber, each node comprising an element heating the wall and an element sensitive to the temperature of the wall;a gen
1. A device to determine characteristics of an aerodynamic stream along a wall, the device comprising: a plurality of temperature-sensitive optical nodes distributed along an optical fiber, each node comprising an element heating the wall and an element sensitive to the temperature of the wall;a generator supplying power to the heating element of each of the nodes; andprocessing means configured to: determine for each node variations in speed of the aerodynamic stream as a function of the power supplied by the generator to supply the heating element with power and of a temperature measured by the element sensitive to the temperature of the wall,differentiate temporal and spatial characteristics of the speed variations of the stream at the various nodes, andcompare the temporal and spatial characteristics with predefined data in order to determine characteristics of the aerodynamic stream. 2. The device according to claim 1, wherein the nodes are distributed along a fiber placed substantially on the wall following a forecast route of a streamline of the aerodynamic stream. 3. The device according to claim 1, wherein the processing means is further configured to compare the stream speeds measured by the various nodes to differentiate a mean amplitude of thermal flowrate of a first group of nodes with a second group of nodes with respect to a predetermined difference threshold, and determine a transition zone situated between the two groups. 4. The device according to claim 1, wherein the processing means is further configured to compare the stream speeds measured by the various nodes in a spectrum ranging from continuous comparisons up to a given frequency with signals of known spectrum to identify signals characteristic of laminar, turbulent, detached flows and of zone of transition between said laminar, turbulent and detached flows. 5. The device according to claim 1, wherein the processing means is further configured to compare the stream speeds measured by the various nodes in a spectrum ranging from continuous comparisons up to a given frequency with signals of known spectrum to identify signals characteristic of recompression shock wave phenomena at a supersonic-subsonic transition. 6. The device according to claim 1, wherein the processing means is further configured to compare the stream speeds measured by the various nodes in a spectrum ranging from continuous comparisons up to a given frequency with signals of known spectrum to identify signals characteristic of phenomena of buffeting and of flutter. 7. The device according to claim 1, wherein the sensitive element of each node comprises at least one Bragg grating which is arranged on the optical fiber and which alters radiation conducted by the optical fiber, the alteration being dependent on the temperature of the wall. 8. The device according to claim 7, wherein the sensitive element comprises two Bragg gratings flanking a resonant cavity whose resonant wavelength is dependent on the temperature of the wall. 9. The device according to claim 1, wherein the heating element of each node comprises a second optical fiber conducting luminous radiation toward the wall to heat it. 10. The device according to claim 9, wherein the wall comprises a material which diffuses the luminous radiation emitted by the second optical fiber of the heating element. 11. The device according to claim 9, wherein the wall comprises a material transparent to the luminous radiation emitted by the second optical fiber of the heating element covered with the diffusing material at the interface between the wall and the medium in which the aerodynamic stream is traveling. 12. The device according to claim 9, wherein an end of the second optical fiber of the heating element is situated in a cavity so as to illuminate a skin. 13. The device according to claim 9, wherein the second optical fiber of the heating element extends along the wall and comprises an end situated in immediate proximity to the element sensitive to the temperature of the wall. 14. The device according to claim 1, wherein at each node, the wall limits a solid body along which the aerodynamic stream travels and in that the solid body comprises a cavity closed by a skin forming the wall at the element sensitive to the temperature of the wall. 15. The device according to claim 1, wherein, for each node, the generator supplies the heating element with power as a function of a setpoint and in that the device comprises means for modulating the setpoint at a given frequency and means for demodulating the temperature measured by the element sensitive to the temperature of the wall, the demodulation being synchronous with the modulation. 16. A loop for controlling a profile of a wall, comprising a device to determine characteristics of an aerodynamic stream along the wall, the device comprising: a plurality of temperature-sensitive optical nodes distributed along an optical fiber, each node comprising an element heating the wall and an element sensitive to the temperature of the wall;a generator supplying power to the heating element of each of the nodes; andprocessing means configured to: determine for each node variations in speed of the aerodynamic stream as a function of power emitted by the generator to supply the heating element and of a temperature measured by the sensitive element,differentiate temporal and spatial characteristics of the speed variations of the stream at the various nodes, andcompare the temporal and spatial characteristics with predefined data in order to determine characteristics of the aerodynamic stream, the loop further comprising at least one electric or fluidic actuator to modify the profile of the wall as a function of the temporal and spatial characteristics of the speed variations of the stream at the various nodes to modify these variations.
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이 특허에 인용된 특허 (4)
Mangalam, Siva M., Method and system for locating critical flow feature indicators in three dimensional flow regimes.
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