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

Abstract

The invention relates to a measuring comb (1) for measuring a parameter of a gas flowing in a vein of a turbomachine, characterized in that the body (2) comprises housings (20), to each of which are fixed respectively both the nozzle (3) and the sensor (4), each housing (20) comprising fixing members (21, 22), the housings (20) being fixed one after the other from the base (21) by their fixing members (21, 22) fixed successively in a removable manner one on the other in a connection position (P), each housing (20) comprising a section (51) of bus (5) and a chip (6) connecting the sensor (4) to the section (51) of bus (5) to allow data communication between the sensor (4) and the section (51) of bus (5). Figure for the abstract: Figure. 1

Description

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

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

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

[0003] Document WO 2015 / 181499 describes a comb for measuring the temperature and / or pressure and / or chemical composition of gases flowing out of a turbomachine flow path, the flow path extending around an axis of revolution of the flow path, the measuring comb comprising an elongated comb body, intended to face the flow path outlet, the comb body comprising measuring orifices arranged along an axis, the measuring orifices being configured to sample gases flowing out of the flow path, the measuring orifices being connected by channels to meters, 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 orientation of the measuring orifice(s) in the direction of flow of the gases leaving the vein, the comb body being a rectilinear rod forming a line of rotation around which the measuring orifice(s) are able to pivot, the rod being provided with a plurality of modules each receiving 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 development of a turbomachine, it is necessary to test the performance of modules and the entire turbomachine. Partial test machines and development turbomachines are provided for this purpose.

[0006] On these test turbomachines, a large number of measurements are carried out by the measuring comb, in particular to characterize the 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, a disadvantage 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 depending on 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 expensive.

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

[0011] For this purpose, a first object of the invention is a comb for measuring at least one parameter of a gas flowing in a vein of a turbomachine, the comb comprising an elongated body having a plurality of gas inlet nozzles, which are distributed in 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 sampled 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 fixing the comb to the turbomachine, characterized in that body comprises a plurality of respective housings, to each respective housing being fixed respectively both the respective nozzle and the respective sensor located against the gas passage space of the respective nozzle, located in 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 in the longitudinal direction from the longitudinal end base by their second fixing member and their first fixing member successively fixed in a removable manner on each other in a connection position, each respective housing comprising an information transmission bus section, which extends from the first surface to the second surface, the longitudinal end base comprising another information transmission bus section, which extends from the third surface, the information transmission bus section and the other information transmission bus section having the same prescribed arrangement in the first surface, in the second surface and in the third surface, such that the information transmission bus sections of the respective housings are connected to one another and to the other information transmission bus section in the connection position, each respective housing having a chip connecting the respective sensor to the information transmission bus section to enable data communication between the respective sensor and the information transmission bus section.

[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 avoids having to modify the air transport channels between the nozzles and the sensors, by providing that each housing is modular by having its own sensor and its own nozzle directly positioned on this housing, which avoids operations of connecting air transport channels. The measuring comb is thus adaptable in a simple, rapid and inexpensive manner to several types of measurement and to several radial positions of the nozzles in the vein of the test turbomachine. This is sufficient to fix the individual housings in a different way on each other. This reduces the time and costs of developing and manufacturing the measuring combs and provides a measuring comb that is easily adaptable to the request.The measuring comb is thus an assembly of pre-equipped boxes. Each box can thus be reused in another assembly of the comb boxes.

[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 fixing member of any of the respective housings is complementary to each first fixing member of any other of the respective housings or of the base, so as to be able to be fixed thereto.

[0015] According to one embodiment of the invention, each information transmission bus section 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 in the longitudinal direction from the longitudinal end base with their second connector and their first connector, which are successively fixed to each other in the connection position.

[0016] According to one embodiment of the invention, the second surface of each respective housing is spaced a respective longitudinal distance from the first surface of each respective housing along the longitudinal direction, the respective longitudinal distances being equal to a 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 fixing member is a male connector, each first fixing member is a female connector, the housings being fixed one after the other in 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 fixing member is a female connector, each first fixing member is a male connector, the housings being fixed one after the other in 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 relative 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 comprises an interface circuit, comprising a reception chip, which is connected to the other section of the information transmission bus, and an output for transferring the 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 that of the other housings.

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

[0026] A second object of the invention is a turbomachine comprising a casing delimiting at least in part a gas passage vein 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 casing, the respective modules being arranged in the gas passage vein, with the respective nozzles oriented against a direction of passage of the gases in the gas passage vein.

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

[0028] [Fig-1] represents a schematic view in vertical section of a measuring comb according to one embodiment of the invention.

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

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

[0031] [Fig.4] represents a schematic view in vertical section 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 below in more detail with reference to FIGS. 1 to 4.

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

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

[0035] Each housing 20 is described below.

[0036] Each housing 20 comprises a gas inlet nozzle 3 and a sensor 4 for measuring at least one parameter of the gas sampled 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 gas outlet 32. The gas passage space 30 of the respective nozzle 3 is therefore located in the respective housing 20. The gas outlet 32 ​​is remote from the gas inlet 31 in the gas flow direction S. 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 projects from the housing 20 (or passes through another wall 24 of the housing 20).

[0037] The housing 20 comprises a first fixing member 21 (or first fixing part 21) located on a first surface 210 of the respective housing 20 and a second fixing member 22 (or second fixing part 22) located on a second surface 220 of the housing 20. The second surface 220 is distant 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 in the longitudinal direction D from the longitudinal end base 21 by their second fixing member 22 and their first fixing member 21 or 231 fixed successively one on the other in a connection position P (or assembled position). Thus, the second fixing member 22 of a following housing 20, such as for example the housing 20b, is fixed on the first fixing member 21 of the preceding housing 20, such as for example the housing 20a in the connection position P, and so on for the successive housings 20 which may be on the housing 20b and / or under the housing 20a. The second fixing member 22 and the first fixing member 21 or 231 are configured so that their fixing 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 circulation 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 part 231) located on a third surface 230 of this base 23. Thus, the second fixing member 22 of a first housing 20, such as for example the housing 20a, is fixed to the first fixing member 231 of the base 23 in the connection position P.

[0041] The housing 20 comprises 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 comprises another section 234 of the information transmission bus 5, which extends from the third surface 230. The section 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 sections 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 in the longitudinal direction D.The other section 234 of the information transmission bus 5 also has this same arrangement prescribed in the third surface 230, such that the sections 51 of the information transmission bus 5 of the housings 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 in the longitudinal direction D.

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

[0043] Thus, to carry out a measurement of the gas parameter at a location situated at a certain distance from the base 23 along the longitudinal direction D, it is sufficient to superimpose the housings 20 on the base 23 to have one of the housings 20 located opposite this location (against the direction S). Thus, the measuring comb 1 can have a number of housings 20, and therefore of nozzles 3 and sensors 4, modifiable according to the desired use on a test turbomachine, this modification being able to be carried out easily by superimposing more or fewer housings 20, without requiring additional manipulations, in particular with regard to the gas conveying channels to the sensors 4, since these gas conveying 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 the use on different turbomachines.

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

[0045] It is therefore possible to interchange the measurement sensor boxes of different types in the same location in the measurement comb 1, without requiring additional manipulations, in particular with regard to the channels for conveying the gas to the sensors 4. Thus, the comb is adaptable between several turbomachines, but also within the same turbomachine. For example, if the untwisting of the blade of the turbomachine is greater than expected (material defect, difference between the calculated and the actual, 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 ordering of the boxes 20 according to the flight phase to be measured of the turbomachine (target engine speed).The superposition of the boxes 20 in the longitudinal direction D forms the structure of the comb 1 thus making it possible to adapt its height h relative to the base 23 in the longitudinal direction D, to adapt the height h at which each measurement is taken and to adapt 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 taking. The comb 1 according to the invention can thus be formed from multiple repetitive boxes 20.

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

[0047] In an exemplary embodiment, the section 51 of information transmission bus 5, the other section 234 of information transmission bus 5 and the chip 6 connecting the respective sensor 4 to the section 51 of information transmission bus 5 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 section 51 of information transmission bus 5, the other section 234 of information transmission bus 5 and the chip 6 connecting the respective sensor 4 to the section 51 of information transmission bus 5 could be of a type other than USB in other exemplary embodiments.

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

[0050] [Fig. 2] shows one of the housings 20 in a disconnected position relative to the other housings 20 and relative to the longitudinal end base 23. [Fig. 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 an embodiment of the invention, the second surface 220 of the housing 20 is spaced apart by a respective longitudinal distance determined relative to 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 one another.

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

[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, so as to be able to be fixed thereto.

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

[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, that is to say by forcefully inserting one into the other, or by snap-fastening, such as for example by male-female connection as described in the embodiments below.

[0056] According to one embodiment of the invention, each second fixing member 22 is a male connector, i.e. having a surface with one or more studs. Each first fixing member 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 in the longitudinal direction D from the longitudinal end base 21 by the male connector of one snapped into the female connector of the other (for example, the stud(s) being wedged in the recess(es)) 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 fixing member 22 is a female connector, i.e. having a surface with one or more recesses. Each first fixing 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 in the longitudinal direction D from the longitudinal end base 21 by the male connector of one snapped into the female connector of the other (for example, the stud(s) being wedged in the recess(es)), 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 section 51 of the information transmission bus 5 comprises one (or more) first connectors 53 located in the first surface 210, one (or more) second connectors 54 located in the second surface 220, and conductors 52 of the information transmission bus 5 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 in the longitudinal direction D from the longitudinal end base 21 with their second connector 54 and their first connector 53 or 233, which are fixed successively to each other in the connection position P. The first connector 53 is distinct from the male connector and the female connector mentioned above.The other first connector 233 is separate from the above-mentioned male connector and female connector. The second connector 54 is separate from the above-mentioned male connector and female connector.

[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, in particular of the USB-C type. 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 wedge fixed under the respective housing 20 closest to the longitudinal end base 21, for example the 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 may be provided with one (or more) measuring combs 1 according to the invention in the connection position. The turbomachine T comprises a casing 360 at least partially delimiting a gas passage vein 390 and one (or more) measuring combs 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 casing 360, and the modules 20 are arranged in the gas passage vein 390, with the respective nozzles 3 oriented against a direction FS1 of passage of the gas in the gas passage vein 390.

[0062] An example of an aeronautical turbomachine T, in which the measuring comb 1 according to the invention can be used, is described below in more detail 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 into 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 are taken along the general direction of the gases which flow in the turbomachine along the axis AX during operation of the turbomachine T. The direction from the inside to the outside is the radial direction DR (or third height direction DR mentioned below) starting from the axis AX. The longitudinal direction D of the measuring comb 1 is parallel to the radial direction DR.

[0065] The turbomachine T comprises 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 comprises, 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 vein VP for the passage of a primary gas flow FP1 from upstream to downstream during operation of the turbomachine T.

[0066] The rotary fan 280 includes a set of rotary fan blades 281 (or fan blades 281) extending radially outwardly from a rotary fan hub 250. The rotary fan blades 281 are externally surrounded by a fan housing 300.

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

[0068] The outer casing 360 comprises, from upstream to downstream, a casing 361 of 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 of the high pressure compressor CHP1, a casing 363 of the high pressure turbine THP1 and a casing 364 of the low pressure turbine TBPL.

[0069] The low pressure compressor CBP1 and the high pressure compressor CHP1 may 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 blades of the low pressure compressor CBP1 are fixed to the casing 361. The rotary blades of the low pressure compressor CBP1 are fixed to a first rotary transmission shaft 410 (or low pressure shaft) in the casings 361, 362, 363 and 364.

[0071] The fixed blades of the high pressure compressor CHP1 are fixed to the casing 362. The rotating blades of the high pressure compressor CHP1 are fixed to a second rotating transmission shaft 400 (or high pressure shaft) in the casings 362 and 363.

[0072] The high pressure turbine THP1 and the low pressure turbine TBP1 may 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 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 coming 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 coming from the combustion chamber 160.

[0076] In operation, air flows through the rotary blower 280 and a first part FP1 (primary flow FP1) of the air flow is routed into the primary vein VP through the low pressure compressor CBP1 and the high pressure compressor CHP1, in which the air flow 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 and thus produce the thrust of the turbomachine T. The turbomachine T also comprises the outer secondary vein 390 which is used to pass a secondary flow FS1 of the air flow discharged from the rotary fan 280 around the outer casing 360. In the outer secondary vein 390 there may be one or more straightening vanes 391 fixed around the outer casing 360.

[0077] In a first application case, the turbomachine T can be of the type without a nacelle around the external secondary vein 390 and around the external casing 360, as shown in [Fig.4]. The external secondary vein 390 is therefore not delimited externally. The advantage of using the measuring comb 1 on a turbomachine T without a nacelle is that the stator 360 where the comb 1 is fixed is constant. This constancy makes it possible to have an anchoring of the comb 1 which 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 vein 390 and around the external casing 360. The external secondary vein 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 casing 360 and for example under the outer surface 365 of the casing 360 to less disturb 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 vein 390 with their nozzles 3 oriented against the secondary gas flow FS1 in the gas passage vein 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 makes it possible to carry out several measurements of the parameter(s) 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 can be provided.

[0083] Of course, the measuring comb 1 could be attached to another part of the tur- 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 an embodiment of the invention, one of the housings 20 has a greater mass than those of the other housings 20, for example each having the same mass. This housing 20 of greater mass serves to manage the dynamic behavior. Its greater mass (which may for example be made of tungsten carbide) and its radial position will make it possible to manage the overall center of gravity of the comb 1.

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

Claims

Claims

1. Comb (1) for measuring at least one parameter of a gas flowing in a vein of a turbomachine (T), the comb (1) comprising an elongated body (2) having a plurality of gas inlet nozzles (3), which are distributed in a longitudinal direction (D) and which respectively have a plurality of gas passage spaces (30), the comb (1) comprising a plurality of sensors (4), which are respectively connected to the plurality of gas passage spaces (30), each sensor (4) being configured to measure at least one parameter of the gas sampled by the gas inlet nozzle (3), called the respective nozzle (3) to which the sensor (4), called the respective sensor (4), is connected, the body (2) having a longitudinal end base (23) used for fixing 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 fixed respectively 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) comprising 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 distant from the first surface (210) along the longitudinal direction (D), the longitudinal end base (23) comprising another first fixing member (231) located on a third surface (230), the respective housings (20) being fixed one after the other in the longitudinal direction (D) from the longitudinal end base (21) by their second fixing member (22) and their first member (21,231) fixing successively fixed in a removable manner on each 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 sections (51) of information transmission bus (5) of the respective housings (20) are connected one after the other and to the other section (234) of information transmission bus (5) in the connection position (P), each respective housing (20) having a chip (6) connecting the respective sensor (4) to the section (51) of information transmission bus (5) to enable data communication between the respective sensor (4) and the section (51) of information transmission bus (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 thereto.

4. Measuring comb according to any one of the preceding claims, characterized in that each section (51) of information transmission bus (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 conductors (52) of information transmission bus (5) connected between the first connector (53) and the second connector (54), the longitudinal end base (23) comprises another first connector (233) located in the third surface (230), the housings (20) being fixed one after the other in 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 each other 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 spaced 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 sensor for measuring, as a parameter, 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 sensor for measuring, as a parameter, 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 fixing member (22) is a male connector, each first fixing member (21, 231) is a female connector, the housings (20) being fixed one after the other in 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 fixing member (22) is a female connector, each first fixing member (21, 231) is a male connector, the housings (20) being fixed one after the other in 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) being 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 relative 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. A measuring comb according to any one of the preceding claims. preceding, characterized in that the longitudinal end base (21) comprises 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), comprising a reception chip (236), which is connected to the other section (234) of the information transmission bus (5), and an output (237) for transferring the parameter measurements to the outside of the measuring comb (1).

13. A measuring comb according to any preceding claim, 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 section (51) of information transmission bus (5) is of the USB type, the other section (234) of information transmission bus (5) is of the USB type, the chip (6) connecting the respective sensor (4) to the section (51) of information transmission bus (5) is of the USB type.

15. Turbomachine (T) comprising a casing (360) delimiting at least in part a gas passage vein (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 casing (360), the respective modules (2) being arranged in the gas passage vein (390), with the respective nozzles (3) oriented against a direction (FS1) of passage of the gases in the gas passage vein (390).

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