Measuring comb for a gas parameter, turbomachine equipped with a measuring comb

Abstract

The invention relates to a measuring comb (1) for measuring a parameter of a gas flowing in a jet of a turbomachine, characterized in that the body (2) comprises housings (20), to each of which are respectively fixed both the nozzle (3) and the sensor (4), each housing (20) having fastening members (21, 22), the housings (20) being fixed one after the other from the base (21) by their fastening members (21, 22) which are successively fixed removably one on top of the other in a connection position (P), each housing (20) having a bus segment (51) and a chip (6) connecting the sensor (4) to the bus segment (51) to allow data communication between the sensor (4) and the bus segment (51). Figure 1

Description

Title of the invention: Comb for measuring a gas parameter, turbomachine having the measuring comb

[0001] The invention relates to a measuring comb for at least one parameter of a gas flowing in a channel of a turbomachine, as well as a turbomachine equipped with this measuring comb.

[0002] The field of the invention relates to the instrumentation of turbomachinery.

[0003] Document WO 2015 / 181499 describes a comb for measuring the temperature and / or pressure and / or chemical composition of gases flowing from the outlet of a turbomachine flow, the flow extending around an axis of revolution of the flow, the measuring comb comprising an elongated comb body intended to be positioned opposite the outlet of the flow, the comb body comprising measuring orifices arranged along an axis, the measuring orifices being configured to sample gases flowing from the outlet of the flow, the measuring orifices being connected by channels to measuring devices, which are assembled in a module remote from the measuring comb and which are configured to measure the temperature and / or pressure and / or chemical composition of the gases sampled by the measuring orifices, the measuring comb being provided with adjustment means configured to adjust an angle between the axis of the measuring orifice(s) and the axis of revolution,so as to allow the measuring orifice(s) to be oriented in the direction of gas flow exiting the stream, the comb body being a straight rod forming a line of rotation around which the measuring orifice(s) are able to pivot, the rod being equipped with a plurality of modules each accommodating a measuring orifice, the modules being configured to pivot around the rod independently of each other.

[0004] Such measuring combs must be used during ground tests on a turbomachine.

[0005] In the context of the development of a turbomachine, it is necessary to test the performance of modules and of the entire turbomachine. Partial test machines and development turbomachines are provided for this purpose.

[0006] On these test turbomachines, a significant number of measurements are taken using the measuring comb, particularly to characterize aerodynamic flows, notably in terms of pressures and temperatures at well-defined axial and radial stations. These axial stations, defined by aerodynamicists, are called measurement planes.

[0007] For each new project mounted on the basis of the same test turbomachine, one drawback is that the measuring comb, including according to document WO 2015 / 181499, must be completely redesigned.

[0008] The need is to adapt to the different sizes of turbomachine blades or to the radial characteristic points to be measured according to the turbomachine blade profile and its untwisting at high speed.

[0009] The development of such fixed elements (plurality of different measuring combs for taking all measurements) including according to document WO 2015 / 181499 has the disadvantage of being long and costly.

[0010] One objective of the invention is to obtain a measuring comb, which overcomes the disadvantages mentioned above.

[0011] To this end, a first object of the invention is a measuring comb for at least one parameter of a gas flowing in a duct of a turbomachine, the comb comprising an elongated body having a plurality of gas inlet nozzles, which are distributed along a longitudinal direction and which respectively have a plurality of gas passage spaces, the comb comprising a plurality of sensors, which are respectively connected to the plurality of gas passage spaces, each sensor being configured to measure at least one parameter of the gas drawn by the gas inlet nozzle, called the respective nozzle to which the sensor, called the respective sensor, is connected, the body having a longitudinal end base used for attaching the comb to the turbomachine, characterized in that The body comprises a plurality of respective housings, to each respective housing being fixed both the respective nozzle and the respective sensor located against the gas passage space of the respective nozzle, situated within the respective housing. each respective housing comprising a first fixing member located on a first surface of the respective housing and a second fixing member located on a second surface of the respective housing, the second surface being distant from the first surface along the longitudinal direction, the longitudinal end base comprising another first fixing member located on a third surface, the respective housings being fixed one after the other along the longitudinal direction from the longitudinal end base by their second fixing member and their first fixing member being successively fixed in a removable manner to one another in a connection position, each respective housing comprising a section of information transmission bus, which extends from the first surface to the second surface, the longitudinal end base comprising another section of information transmission bus, which extends from the third surface, the information transmission bus segment and the other information transmission bus segment having the same prescribed arrangement in the first surface, in the second surface and in the third surface, such that the information transmission bus segments of the respective housings are connected one after the other and to the other information transmission bus segment in the connection position, each respective housing having a chip linking the respective sensor to the information transmission bus segment to enable data communication between the respective sensor and the information transmission bus segment.

[0012] Thanks to the invention, the measuring comb does not need to be completely redesigned to be fixed in different measurement planes of a test turbomachine or for different test turbomachines. The invention eliminates the need to modify the air transport channels between the nozzles and the sensors by providing that each housing is modular, having its own sensor and nozzle directly positioned on it, thus avoiding the need to connect air transport channels. The measuring comb can therefore be adapted simply, quickly, and inexpensively to several types of measurement and to several radial positions of the nozzles in the test turbomachine's flow path. This is achieved simply by fixing the individual housings differently. This reduces the time and costs of developing and manufacturing the measuring combs and results in a measuring comb that is easily adaptable to demand.The measuring comb is thus an assembly of pre-equipped housings. Each housing can therefore be reused in another assembly of housings for the comb.

[0013] According to one embodiment of the invention, each respective sensor is a MEMS type circuit.

[0014] According to one embodiment of the invention, each second fastening member of any of the respective housings is complementary to each first fastening member of any other of the respective housings or of the base, in order to be able to be fixed on it.

[0015] According to one embodiment of the invention, each information transmission bus segment comprises at least one first connector located in the first surface, at least one second connector located in the second surface, and information transmission bus conductors connected between the first connector and the second connector; the longitudinal end base comprises another first connector located in the third surface. the housings being fixed one after the other along the longitudinal direction from the longitudinal end base with their second connector and their first connector, which are successively fixed one to the other in the connection position.

[0016] According to one embodiment of the invention, the second surface of each respective housing is distanced by a respective longitudinal distance from the first surface of each respective housing along the longitudinal direction, the respective longitudinal distances being equal to the same prescribed longitudinal pitch, identical for all the respective housings, along the longitudinal direction.

[0017] According to one embodiment of the invention, at least one of the respective sensors is a sensor for measuring, as a parameter, the temperature of the gas in the gas passage space of the respective nozzle.

[0018] According to one embodiment of the invention, at least one of the respective sensors is a sensor for measuring, as a parameter, the gas pressure in the gas passage space of the respective nozzle.

[0019] According to one embodiment of the invention, each second fastening member is a male connector, each first fastening member is a female connector, the housings being fixed one after the other along the longitudinal direction from the longitudinal end base by the male connector of one snapped into the female connector of the other with the second surface of one being against the first surface of the other or against the third surface in the connection position.

[0020] According to one embodiment of the invention, each second fastening member is a female connector, each first fastening member is a male connector, the housings being fixed one after the other along the longitudinal direction from the longitudinal end base by the male connector of one snapped into the female connector of the other with the first surface of one or the third surface being against the second surface of the other in the connection position.

[0021] According to one embodiment of the invention, the respective housings have a disconnected position relative to each other and to the longitudinal end base, in which the respective housings are not fixed to each other, nor to the longitudinal end base.

[0022] According to one embodiment of the invention, the longitudinal end base comprises at least one raising wedge fixed under the respective housing closest to the longitudinal end base.

[0023] According to one embodiment of the invention, the longitudinal end base includes an interface circuit, comprising a receiving chip, which is connected to the other information transmission bus segment, and an output for transferring parameter measurements to the outside of the measuring comb.

[0024] According to one embodiment of the invention, one of the housings has a greater mass than the other housings.

[0025] According to one embodiment of the invention, the information transmission bus segment is of the USB type, the other information transmission bus segment is of the USB type, the chip linking the respective sensor to the information transmission bus segment is of the USB type.

[0026] A second object of the invention is a turbomachine comprising a housing delimiting at least in part a gas passage channel and at least one measuring comb as described above in the connection position, the measuring comb being fixed by its longitudinal end base to the housing, the respective modules being arranged in the gas passage channel, with the respective nozzles oriented against a direction of gas passage in the gas passage channel.

[0027] The invention will be better understood upon reading the following description, given solely by way of non-limiting example with reference to the figures below of the attached drawings.

[0028] [Fig-1] represents a schematic vertical cross-sectional view of a measuring comb according to an embodiment of the invention.

[0029] [Fig.2] represents a schematic vertical cross-sectional view of a measuring comb housing according to an embodiment of the invention.

[0030] [Fig.3] represents a schematic vertical cross-sectional view of a longitudinal end base of a measuring comb housing according to an embodiment of the invention.

[0031] [Fig.4] represents a schematic vertical cross-sectional view of a turbomachine comprising a measuring comb according to an embodiment of the invention.

[0032] An example of a measuring comb 1 according to embodiments of the invention is described in more detail below with reference to figures 1 to 4.

[0033] The comb 1 for measuring at least one parameter of a gas flowing in a channel of a turbomachine T, which may be a turbomachine located on the ground on a test bench.

[0034] The comb 1 has a body 2 of elongated shape along a longitudinal direction D. The body 2 has housings 20 (or modules 20) that can be fixed one on top of the other along the longitudinal direction D. The body 2 has a longitudinal end base 23 (or foot of the comb 1) for fixing the comb 1 to the turbomachine T.

[0035] Each housing 20 is described below.

[0036] Each housing 20 includes a gas inlet nozzle 3 and a sensor 4 for measuring at least one parameter of the gas drawn in by the gas inlet nozzle 3. The nozzle 3 has a gas passage space 30, delimited by a wall between a gas inlet 31 and a The gas outlet 32. The gas passage space 30 of the respective nozzle 3 is therefore located within the respective housing 20. The gas outlet 32 ​​is offset from the gas inlet 31 in the direction S of gas flow. The sensor 4 is connected to and located against the gas passage space 30 of the nozzle 3. The sensor 4 and the nozzle 3 are fixed to the housing 20. The sensor 4 can be fixed against the wall, as shown in [Fig. 1]. In other cases, the sensor 4 can be fixed against the gas outlet 32. The nozzle 3 protrudes from the housing 20 (or passes through another wall 24 of the housing 20).

[0037] The housing 20 includes a first fixing member 21 (or first fixing part 21) located in a first surface 210 of the respective housing 20 and a second fixing member 22 (or second fixing part 22) located in a second surface 220 of the housing 20. The second surface 220 is away from the first surface 210 along the longitudinal direction D, and is for example opposite the first surface 210.

[0038] The housings 20 are fixed one after the other along the longitudinal direction D from the longitudinal end base 21 by their second fastening member 22 and their first fastening member 21 or 231, which are successively fixed one on top of the other in a connection position P (or assembled position). Thus, the second fastening member 22 of a subsequent housing 20, such as housing 20b, is fixed onto the first fastening member 21 of the preceding housing 20, such as housing 20a, in the connection position P, and so on for successive housings 20, which may be on top of housing 20b and / or under housing 20a. The second fastening member 22 and the first fastening member 21 or 231 are configured so that their attachment to each other in the connection position P is removable in the connection position.

[0039] The nozzles 3 are thus distributed along the longitudinal direction D in the connection position P and are fixed relative to the longitudinal end base 23. The nozzles 3 have the same fixed orientation against the direction S of gas flow in the connection position P. The gas inlets 31 of the nozzles can be located in the same measuring plane PL for the measuring comb 1, this measuring plane P"L being defined relative to the base 23. The gas inlets 31 of the nozzles can be aligned along the same straight line DL parallel to the longitudinal direction D in the measuring plane PL.

[0040] The longitudinal end base 23 also has another first fixing member 231 (or other first fixing piece 231) located in a third surface 230 of this base 23. Thus, the second fixing member 22 of a first housing 20, such as for example housing 20a, is fixed on the first fixing member 231 of the base 23 in the connection position P.

[0041] The housing 20 includes a section 51 of an information transmission bus 5, which extends from the first surface 210 to the second surface 220. The longitudinal end base 23 has another segment 234 of the information transmission bus 5, which extends from the third surface 230. The segment 51 of the information transmission bus 5 has the same prescribed arrangement in the first surface 210 and in the second surface 220, such that the segments 51 of the information transmission bus 5 of the housings 20 are connected one after the other in the connection position P, to form the information transmission bus 5 extending in the body 2 along the longitudinal direction D.The other section 234 of the information transmission bus 5 also has this same prescribed arrangement in the third surface 230, so that the sections 51 of the information transmission bus 5 of the boxes 20 are connected to the other section 234 of the information transmission bus 5 in the connection position P, to form the information transmission bus 5 extending in the body 2 along the longitudinal direction D. .

[0042] The housing 20 includes a chip 6 (or recognition chip 6) connecting the sensor 4 to the segment 51 of the information transmission bus 5. The chip 6 is configured to allow data communication between the sensor 4 and the segment 51 of the information transmission bus 5.

[0043] Thus, to measure the gas parameter at a location situated a certain distance from the base 23 along the longitudinal direction D, it suffices to stack the housings 20 on the base 23 so that one of the housings 20 is positioned opposite this location (against the direction S). Therefore, the measuring comb 1 can have a number of housings 20, and thus of nozzles 3 and sensors 4, that can be modified according to the desired application on a test turbomachine. This modification can be easily carried out by stacking more or fewer housings 20, without requiring any additional manipulations, particularly with regard to the gas delivery channels to the sensors 4, since these gas delivery channels are formed by the nozzles 3 and are integrated into each housing 20. The total height of the housings 20 along the direction D can also be adapted according to the needs and application on different turbomachines.

[0044] Similarly, it is possible to have different types of sensors 4 on the housings 20. For example, one or more or all of the housings 20 may have its sensor(s) 4 of a first type, configured, for example, to measure, as a parameter, the temperature of the gas in the gas passage space 30 of the nozzle(s). Another or several or all of the housings 20 may have its sensor(s) 4 of a second type, configured, for example, to measure, as a parameter, the gas pressure in the gas passage space 30 of the nozzle(s). Another or several or all of the housings 20 may have its sensor(s) 4 of a third type. type, configured for example to measure, as a parameter, an acoustic parameter of the gas in the 30 gas passage space of the (or their) nozzle.

[0045] It is therefore possible to interchange different types of measuring sensor housings in the same location within the measuring comb 1, without requiring any additional manipulations, particularly with regard to the gas supply channels to the sensors 4. Thus, the comb is adaptable between several turbomachines, but also within the same turbomachine. For example, if the turbomachine blade twist is greater than expected (material defect, discrepancy between calculated and actual values, manufacturing defect, etc.), it is easy to modify the arrangement of the modules 20 to take this into account, for example by adding one (or more) additional modules. It is also possible to completely change the arrangement of the housings 20 according to the flight phase of the turbomachine to be measured (target engine speed).The superposition of the housings 20 along the longitudinal direction D forms the structure of the comb 1, thus allowing its height h to be adapted relative to the base 23 along the longitudinal direction D, adapting the height h at which each measurement is taken, and adapting the type of measurement taken to a given height h. The invention thus makes it possible to have a very compact and very inexpensive measuring comb with precise measurement capabilities. The comb 1 according to the invention can therefore be formed from multiple repeating housings 20.

[0046] In the connection position of the signal transport measurement comb 1, each sensor 4 transmits the measurement of its parameter to the chip 6, which transmits the measurement to the segment 51 of the information transmission bus 5 and thus to the segment 234 of the information transmission bus of the longitudinal end base 23.

[0047] In one embodiment, the information transmission bus segment 51, the other information transmission bus segment 234, and the chip 6 connecting the respective sensor 4 to the information transmission bus segment 51 are of the USB type, in particular of the USB-C type. The acronym USB stands for "Universal Serial Bus," i.e., serial computer bus. Of course, the information transmission bus segment 51, the other information transmission bus segment 234, and the chip 6 connecting the respective sensor 4 to the information transmission bus segment 51 could be of a type other than USB in other embodiments.

[0048] According to one embodiment of the invention, the longitudinal end base 23 comprises an interface circuit 235. The interface circuit 235 includes a receiver chip 236, which is connected to the segment 234 of the information transmission bus 5. The interface circuit 235 may include an output 237 for transferring parameter measurements outside the measuring comb 1. The output 237 may be connected to another instrument for processing and analyzing the parameter measurements. In the example In the embodiment mentioned above, the receiving chip 236 is of the USB type, specifically USB-C. Of course, the receiving chip 236 could be of a different type than USB in other embodiments.

[0049] Once the measurements have been carried out by the sensors 4 in the connection position of the measuring comb 1, the second fixing members 22 and the first fixing members 21 or 231 can then be separated from each other to separate the housings 20 from each other as well as to separate the housings 2 from the longitudinal end base 23 in the disconnection position.

[0050] Figure 2 shows one of the housings 20 in a disconnected position relative to the other housings 20 and to the longitudinal end base 23. Figure 3 shows the longitudinal end base 23 in the disconnected position relative to the housings 20. In the disconnected position, the housings are not fixed to each other, nor to the longitudinal end base 23.

[0051] According to one embodiment of the invention, the second surface 220 of the housing 20 is distanced by a determined longitudinal distance from the first surface 210 of this housing 20 along the longitudinal direction D. The respective longitudinal distances of the housings 20 may be equal to the same prescribed longitudinal pitch PD, identical for all the housings 20, along the longitudinal direction D. In other cases, several of the respective longitudinal distances of the housings 20 may be different from each other.

[0052] According to one embodiment of the invention, each sensor 4 is a MEMS type circuit. The acronym MEMS stands for "Microelectromechanical System".

[0053] According to one embodiment of the invention, each second fixing member 22 of any of the housings 20 is complementary to each first fixing member 21 or 231 of any other of the housings 20 or of the base 23, in order to be able to be fixed on it.

[0054] According to one embodiment of the invention, each second fixing member 22 of any of the housings 20 is of complementary shape to that of each first fixing member 21 or 231 of any other of the housings 20 or of the base 23, so as to be able to be fixed on it.

[0055] Each second fixing member 22 and each first fixing member 21 or 231 can be fixed to each other in a removable manner by clipping, i.e. by force insertion into each other, or by snapping, such as for example by male-female connection as described in the embodiments below.

[0056] According to one embodiment of the invention, each second fastening member 22 is a male connector, that is to say having a surface with one or more studs. Each first fastening element 21 or 231 is a female connector, i.e., having a surface with one or more recesses. The housings 20 are fixed one after the other along the longitudinal direction D from the longitudinal end base 21 by the male connector of one being snapped into the female connector of the other (for example, the pin(s) being wedged into the recess(s)) with the second surface 220 of one being against the first surface 210 of the other or against the third surface 230 in the connection position P.

[0057] According to one embodiment of the invention, each second fastening member 22 is a female connector, i.e., having a surface with one or more recesses. Each first fastening member 21 or 231 is a male connector, i.e., having a surface with one or more studs. The housings 20 are fixed one after the other along the longitudinal direction D from the longitudinal end base 21 by the male connector of one being snapped into the female connector of the other (for example, the stud(s) being wedged into the recess(s)), with the first surface 210 of one or the third surface 230 being against the second surface 220 of the other in the connection position P.

[0058] According to one embodiment of the invention, each segment 51 of the information transmission bus 5 comprises one (or more) first connector 53 located in the first surface 210, one (or more) second connector 54 located in the second surface 220, and information transmission bus 5 conductors 52 connected between the first connector 53 and the second connector 54. The longitudinal end base 23 comprises another first connector 233 located in its third surface 230. The housings 20 are fixed one after the other along the longitudinal direction D from the longitudinal end base 21 with their second connector 54 and their first connector 53 or 233, which are successively fixed to one another in the connection position P. The first connector 53 is distinct from the male and female connectors mentioned above.The other first connector 233 is distinct from the male and female connectors mentioned above. The second connector 54 is distinct from the male and female connectors mentioned above.

[0059] In the embodiment mentioned above, the first connector 53, the second connector 54, and the other first connector 233 are of the USB type, specifically USB-C. Of course, the first connector 53, the second connector 54, and the other first connector 233 could be of a type other than USB in other embodiments.

[0060] According to one embodiment of the invention, the longitudinal end base 21 comprises at least one raising shim fixed under the respective housing 20 closest to the longitudinal end base 21, for example housing 20a at the [Fig.l]. It will thus be easy to add one (or more) shims to raise the sensor used to measure the disturbances above the blade 281 facing it.

[0061] In [Fig. 4], a turbomachine T can be equipped with one (or more) measuring comb 1 according to the invention in the connection position. The turbomachine T comprises a housing 360 delimiting at least partially a gas passage 390 and one (or more) measuring comb 1 in the connection position. In the mounting position of the measuring comb 1 on the turbomachine T, the longitudinal end base 23 of the measuring comb 1 is fixed to the housing 360, and the modules 20 are arranged in the gas passage 390, with the respective nozzles 3 oriented against a direction FS1 of gas flow in the gas passage 390.

[0062] An example of an aeronautical turbomachine T, in which the measuring comb 1 according to the invention can be used, is described in more detail below with reference to [Fig.4].

[0063] As is known, the turbomachine T shown in [Fig. 4] is intended to be installed on an aircraft (not shown) to propel it through the air. The turbomachine T on which the measuring comb 1 is mounted may be a turbomachine located on the ground on a test bench.

[0064] The gas turbine engine assembly or turbomachine T extends around an axis AX or axial direction AX oriented from upstream to downstream. In [Fig. 4], the terms "upstream" and "downstream" respectively refer to the general direction of the gases flowing into the turbomachine along the axis AX during the operation of the turbomachine T. The direction from the inside out is the radial direction DR (or third height direction DR mentioned below) originating from the axis AX. The longitudinal direction D of the measuring comb 1 is parallel to the radial direction DR.

[0065] The turbomachine T includes a first stage formed by a rotary fan 280 and a gas generator 130, located downstream of the rotary fan 280. Central to the turbomachine T, the gas generator 130 includes, from upstream to downstream in the direction of gas flow, a low pressure compressor CBP1, a high pressure compressor CHP1, a combustion chamber 160, a high pressure turbine THP1 and a low pressure turbine TBP1, which delimit a primary channel VP for the passage of a primary gas flow FP1 from upstream to downstream during the operation of the turbomachine T.

[0066] The rotary blower 280 comprises a set of rotary blower blades 281 extending radially outwards from a rotary blower hub 250. The rotary blower blades 281 are surrounded externally by a blower housing 300.

[0067] The turbomachine T has an upstream inlet end 290 located upstream of the blower 280, and a downstream exhaust end 310. The turbomachine T also includes an outer casing 360 which externally delimits the primary VP in which the primary flow FP1 flows downstream of the blower 280 through the low pressure compressor CBP1, the high pressure compressor CHP1, the high pressure turbine THP1 and the low pressure turbine TBP1 during the operation of the turbomachine T.

[0068] The outer casing 360 comprises, from upstream to downstream, a casing 361 for the low-pressure compressor CBP1, an intermediate casing 260, which is interposed between the low-pressure compressor CBP1 and the high-pressure compressor CHP1, a casing 362 for the high-pressure compressor CHP1, a casing 363 for the high-pressure turbine THP1, and a casing 364 for the low-pressure turbine TBPL

[0069] The low pressure compressor CBP1 and the high pressure compressor CHP1 can each comprise one or more stages, each stage being formed by a set of fixed blades (or stator blades) and a set of rotating blades (or rotor blades).

[0070] The fixed vanes of the low-pressure compressor CBP1 are fixed to the housing 361. The rotating vanes of the low-pressure compressor CBP1 are fixed to a first rotating transmission shaft 410 (or low-pressure shaft) in the housings 361, 362, 363 and 364.

[0071] The fixed vanes of the high-pressure compressor CHP1 are fixed to the housing 362. The rotating vanes of the high-pressure compressor CHP1 are fixed to a second rotating transmission shaft 400 (or high-pressure shaft) in the housings 362 and 363.

[0072] The high pressure turbine THP1 and the low pressure turbine TBP1 can each comprise one or more stages, each stage being formed by a set of fixed blades (or stator blades) and a set of rotating blades (or rotor blades).

[0073] The fixed blades of the high-pressure turbine THP1 are fixed to the casing 363. The rotating blades of the high-pressure turbine THP1 are fixed to the second rotating transmission shaft 400.

[0074] The fixed blades of the low-pressure turbine TBP1 are fixed to the casing 364. The rotating blades of the low-pressure turbine TBP1 are fixed to the first rotating transmission shaft 410.

[0075] During the operation of the turbomachine T, the rotating blades of the low-pressure turbine TBP1 drive the rotating blades of the low-pressure compressor CBP1 to rotate around the axis AX under the effect of the thrust of the gases from the combustion chamber 160. The rotating blades of the high-pressure turbine THP1 drive the rotating blades of the high-pressure compressor CHP1 to rotate around the axis AX under the effect of the thrust of the gases from the combustion chamber 160.

[0076] In operation, air flows through the rotary blower 280 and a first The FP1 portion (primary stream FP1) of the airflow is routed into the primary stream VP through the low-pressure compressor CBP1 and the high-pressure compressor CHP1, where the airflow is compressed and sent to the combustion chamber 160. The hot combustion products from the combustion chamber 160 are used to drive the turbines THP1 and TBP1, thus producing the thrust of the turbomachine T. The turbomachine T also includes the outer secondary stream 390, which is used to route a secondary stream FS1 of the airflow discharged from the rotary fan 280 around the outer casing 360. One or more straightening blades 391 may be located in the outer secondary stream 390, fixed around the outer casing 360.

[0077] In a first application, the turbomachine T can be of the nacelle-free type around the outer secondary flow 390 and around the outer casing 360, as shown in [Fig. 4]. The outer secondary flow 390 is therefore not externally delimited. The advantage of using the measuring comb 1 on a nacelle-free turbomachine T is that the stator 360, to which the comb 1 is attached, remains constant. This constant position ensures that the anchoring of the comb 1 no longer varies.

[0078] In a second application case, not shown, the turbomachine T can be of the type with a nacelle around the external secondary flow 390 and around the external casing 360. The external secondary flow 390 is therefore delimited externally by the nacelle.

[0079] In the mounting position of the measuring comb 1 on the turbomachine T, and in the connection position, the longitudinal end base 23 of the measuring comb 1 according to the invention can be fixed to the outer surface 365 of the housing 360 and, for example, below the outer surface 365 of the housing 360 to minimize disturbance to the secondary flow FS1. In the mounting position of the measuring comb 1 on the turbomachine T, and in the connection position, the modules 20 are arranged in the gas passage 390 with their nozzles 3 oriented against the secondary gas flow FS1 in the gas passage 390. The longitudinal direction D is secant with respect to the axial direction AX and can be parallel to the radial direction DR.

[0080] The measuring comb 1 thus allows several measurements of the parameter(s) to be made at different heights h of the nozzles 3 along the radial direction DR, in order to be able to measure the parameter(s) at different radial characteristic points.

[0081] The measuring comb 1 can be arranged with the measuring plane PL of the inlets 31 of its nozzles 3 located in different planes PLI, PL2, PL3, PL4, having different positions along the axis AX.

[0082] Of course, in the measuring comb 1, one or more modules without sensor 4 may be provided.

[0083] Of course, the measuring comb 1 could be attached to another part of the tower- bomachine T and / or nozzles 3 could be located elsewhere than in the secondary flow FS1, such as for example in the primary flow FP1.

[0084] Of course, the measuring comb 1 could be fixed to another part of a test bench on which the turbomachine T is installed on the ground, this other part not being the turbomachine.

[0085] According to one embodiment of the invention, one of the housings 20 has a greater mass than the other housings 20, each having, for example, the same mass. This housing 20 with a greater mass serves to manage the dynamic behavior. Its greater mass (which could, for example, be made of tungsten carbide) and its radial position will allow the overall center of gravity of the comb 1 to be managed.

[0086] Of course, the embodiments, features, possibilities and examples described above can be combined with each other or selected independently of each other.

Claims

Demands

1. Comb (1) for measuring at least one parameter of a gas flowing in a channel of a turbomachine (T), the comb (1) comprising an elongated body (2) having a plurality of gas inlet nozzles (3) distributed along a longitudinal direction (D) and having respectively a plurality of gas passage spaces (30), the comb (1) comprising a plurality of sensors (4) connected respectively to the plurality of gas passage spaces (30), each sensor (4) being configured to measure at least one parameter of the gas drawn by the gas inlet nozzle (3), referred to as the respective nozzle (3) to which the sensor (4), referred to as the respective sensor (4), is connected, the body (2) having a longitudinal end base (23) for attaching the comb (1) to the turbomachine (T), characterized in that the body (2) comprises a plurality of respective housings (20),to each respective housing (20) being respectively fixed both the respective nozzle (3) and the respective sensor (4) located against the gas passage space (30) of the respective nozzle (3), located in the respective housing (20), each respective housing (20) having a first fixing member (21) located on a first surface (210) of the respective housing (20) and a second fixing member (22) located on a second surface (220) of the respective housing (20), the second surface (220) being offset from the first surface (210) along the longitudinal direction (D), the longitudinal end base (23) having another first fixing member (231) located on a third surface (230), the respective housings (20) being fixed one after the other along the longitudinal direction (D) from the longitudinal end base (21) by their second member (22) of fixation and their first organ (21,231) of fixing successively fixed in a removable manner one on top of the other in a connection position (P), each respective housing (20) comprising a section (51) of information transmission bus (5), which extends from the first surface (210) to the second surface (220), the longitudinal end base (23) comprising another section (234) of information transmission bus (5), which extends from the third surface (230), the section (51) of information transmission bus (5) and the other section, (234) of information transmission bus (5) having the same prescribed arrangement in the first surface (210), in the second surface (220) and in the third surface (230), such that the information transmission bus (51) segments (5) of the respective housings (20) are connected one after the other and to the other information transmission bus (234) segment (5) in the connection position (P), each respective housing (20) having a chip (6) connecting the respective sensor (4) to the information transmission bus (51) segment (5) to enable data communication between the respective sensor (4) and the information transmission bus (51) segment (5).

2. Measuring comb according to claim 1, characterized in that each respective sensor (4) is a MEMS type circuit.

3. Measuring comb according to any one of the preceding claims, characterized in that each second fixing member (22) of any of the respective housings (20) is complementary to each first fixing member (21) of any other of the respective housings (20) or of the base (23), so as to be able to be fixed to it.

4. Measuring comb according to any one of the preceding claims, characterized in that each information transmission bus (51) segment (5) comprises at least one first connector (53) located in the first surface (210), at least one second connector (54) located in the second surface (220), and information transmission bus (52) conductors (52) connected between the first connector (53) and the second connector (54), the longitudinal end base (23) comprising another first connector (233) located in the third surface (230), the housings (20) being fixed one after the other along the longitudinal direction (D) from the longitudinal end base (21) with their second connector (54) and their first connector (53, 233), which are fixed successively to one another in the connection position (P).

5. Measuring comb according to any one of the preceding claims, characterized in that the second surface (220) of each respective housing (20) is located at a respective longitudinal distance from the first surface (210) of each respective housing (20) along the longitudinal direction (D), the respective longitudinal distances being equal to the same prescribed longitudinal pitch (PD), identical for all the respective housings (20), along the longitudinal direction (D).

6. Measuring comb according to any one of the preceding claims, characterized in that at least one of the respective sensors (4) is a measuring sensor, as a parameter, of the temperature of the gas in the gas passage space (30) of the respective nozzle (3).

7. Measuring comb according to any one of the preceding claims, characterized in that at least one of the respective sensors (4) is a measuring sensor, as a parameter, of the gas pressure in the gas passage space (30) of the respective nozzle (3).

8. Measuring comb according to any one of claims 1 to 7, characterized in that each second fastening member (22) is a male connector, each first fastening member (21, 231) is a female connector, the housings (20) being fixed one after the other along the longitudinal direction (D) from the longitudinal end base (21) by the male connector of one snapped into the female connector of the other with the second surface (220) of one being against the first surface (210) of the other or against the third surface (230) in the connection position (P).

9. Measuring comb according to any one of claims 1 to 7, characterized in that each second fastening member (22) is a female connector, each first fastening member (21, 231) is a male connector, the housings (20) being fixed one after the other along the longitudinal direction (D) from the longitudinal end base (21) by the male connector of one snapped into the female connector of the other with the first surface (210) of one or the third surface (230) lying against the second surface (220) of the other in the connection position (P).

10. Measuring comb according to any one of the preceding claims, characterized in that the respective housings (20) have a disconnected position relative to each other and to the longitudinal end base (23), in which the respective housings (20) are not fixed to each other, nor to the longitudinal end base (23).

11. Measuring comb according to any one of the preceding claims cédentes, characterized in that the longitudinal end base (21) has at least one raising wedge fixed under the respective housing (20) closest to the longitudinal end base (21).

12. Measuring comb according to any one of the preceding claims, characterized in that the longitudinal end base (23) comprises an interface circuit (235), including a receiving chip (236), which is connected to the other segment (234) of the information transmission bus (5), and an output (237) for transferring parameter measurements to the outside of the measuring comb (1).

13. Measuring comb according to any one of the preceding claims, characterized in that one of the housings (20) has a greater mass than the other housings (20).

14. Measuring comb according to any one of the preceding claims, characterized in that the information transmission bus (51) segment (5) is of the USB type, the other information transmission bus (234) segment (5) is of the USB type, the chip (6) linking the respective sensor (4) to the information transmission bus (51) segment (5) is of the USB type.

15. Turbomachine (T) comprising a housing (360) delimiting at least in part a gas passage channel (390) and at least one measuring comb (1) according to any one of the preceding claims in the connection position, the measuring comb (1) being fixed by its longitudinal end base (23) to the housing (360), the respective modules (2) being arranged in the gas passage channel (390), with the respective nozzles (3) oriented against a direction (FS1) of gas passage in the gas passage channel (390).

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