Measurement acquisition device with a sliding attack section on a support

Abstract

The present invention relates to a measurement acquisition device comprising a support (2) adapted to be attached to a turbomachine test bench, a leading edge (3) adapted to face a gas flow circulating in the turbomachine test bench when the support (2) is attached to the turbomachine test bench, and a sensor (6) arranged on the leading edge (3) to acquire a characteristic measurement of the gas flow when the support (2) is attached to the turbomachine test bench. The device is characterized in that the leading edge (3) defines a groove, and the support (2) comprises a rail extending in the groove so as to form a sliding connection. The leading edge (3) is mounted detachably relative to the support (2). Figure for the abstract: Fig. 4

Description

Title of the invention: Measurement acquisition device with a sliding drive portion on a support technical field

[0001] This disclosure relates to the general field of devices for measuring the characteristics of a gas flow circulating in a turbomachine. STATE OF THE ART

[0002] A turbomachine is a device that generates thrust using a flow of gas circulating in the turbomachine.

[0003] During the design of a new turbomachine, it is necessary to test the performance of turbomachine components on a turbomachine test bench. During these performance tests, a significant number of measurements are taken, such as pressure or temperature measurements, to characterize the gas flow within the turbomachine. These measurements are performed by an intrusive measurement acquisition device immersed in the gas flow. The measurement device, fixed to the turbomachine test bench at a specific longitudinal position, acquires measurements parallel to the axis of rotation of the turbomachine's fan. The measurement acquisition device comprises various sensors immersed in the gas flow so as to simultaneously acquire measurements at defined radial positions (i.e., points more or less distant from the turbomachine's axis of rotation on the test bench).

[0004] The use of such a measurement acquisition device is restrictive.

[0005] On the device, the sensors are fixed. It may be necessary to replace the measurement acquisition device with another, either to modify the radial positions of the sensors, or to change the sensor, or even the type of measurement. However, to do this, the device must be completely disassembled from the test bench before reassembling the new device that replaces it.

[0006] Furthermore, the measurement acquisition device may be suitable for testing a turbomachine having a certain geometry, but may prove unsuitable for testing a turbomachine having a different geometry.

[0007] These constraints thus lead to a multiplication of measurement acquisition devices, which represents a manufacturing cost, as well as the handling related to their dismantling and replacement, which increases the overall cost of test operations. Description of the invention

[0008] One purpose of this disclosure is to propose a measurement acquisition device that reduces the overall cost of test operations to be carried out on a test bench for a turbomachine, capable of evaluating several turbomachines of different geometries.

[0009] This goal is achieved by a measurement acquisition device comprising:

[0010] a support suitable for being attached to a test bench for a turbomachine,

[0011] a leading part adapted to withstand a gas flow circulating in the turbomachine test bench, when the support is attached to the turbomachine test bench,

[0012] a sensor arranged on the leading part to acquire a characteristic measurement of the gas flow, when the support is attached to the turbomachine test bench,

[0013] characterized in that the attacking part delimits a groove, and the support includes a rail extending in the groove so as to form a sliding connection, the attacking part being mounted in a detachable manner relative to the support.

[0014] Thanks to the sliding joint, the leading edge portion defining the leading edge of the aerodynamic profile of the measuring device can be detached from the support by translation. The leading edge portion can then be replaced following a failure, or a new leading edge portion with a different profile can be inserted onto the support along the sliding joint, to adapt the device to different tests, for example, a change in the operating conditions of the turbomachine being evaluated.

[0015] Thus, a modification of the device's aerodynamic profile, axial positioning, or sensor orientation does not require completely disassembling the measurement acquisition device, but can be achieved by selectively replacing the leading edge without disassembling the support. The development and manufacturing costs and time of the device are thereby reduced since the support can be retained from one test to the next.

[0016] Furthermore, the sliding joint offers the technical advantage of holding the leading edge in place by preventing its movement in directions other than the translational direction. Beyond allowing the leading edge to be removable from the support, the sliding joint ensures a large contact surface between the leading edge and the support after assembly. This provides good mechanical strength compared to other types of joints.

[0017] The invention is advantageously complemented by the following features, taken individually or in any of their technically possible combinations: • The sliding joint allows a translation of the attacking part relative to the support in a direction of translation; the attacking part includes a first hook curved upon itself in a transverse plane which is orthogonal to the direction of translation. • the support includes a second hook curved on itself in the transverse plane, the second hook being engaged with the first hook; • The attacking part has an external surface, the external surface comprising a first side and the first hook delimits the first side; • The attacking part includes a third hook curved back on itself in the transverse plane, • the support includes a fourth hook curved on itself in the transverse plane, the fourth hook being engaged with the third hook; • the third bracket is symmetrical to the first bracket and / or the fourth bracket is symmetrical to the second bracket • the external surface includes a leading edge and a second side opposite the first side with respect to the leading edge, and the third hook delimits the second side; • the support delimits a channel for the passage of an electrical cable connecting the sensor to other equipment; • the measurement acquisition device includes a blocking element to block a translation of the attacking part relative to the support; • The measurement acquisition device includes a leakage part opposite the attack part with respect to the support, the leakage part being mounted on the support by a second sliding connection, in a manner detachable from the support; • the attack part and the escape part are independently detachable; • the trailing part defines a groove, and the support includes a rail extending into the groove defined by the trailing part, the second sliding connection being formed by the groove defined by the trailing part and the rail of the support; • the attacking part has an external surface, and the fleeing part has a second external surface which extends tangentially from the external surface; • The sliding joint allows a translation of the attacking part relative to the support in a direction of translation, in a transverse plane which is orthogonal to the direction of translation, the attacking part and the trailing part completely cover the support.

[0018] This disclosure also relates to a set comprising: • a test bench for a turbomachine, • a measurement acquisition device as described above, the measurement acquisition device being fixed to the turbomachine so that the attack part faces a flow of gas circulating in the turbomachine test bench.

[0019] This disclosure also relates to a method using a measurement acquisition device or assembly as described above, the method comprising: • Detach the attacking part from the support by translating the attacking part relative to the support via the sliding joint, • attach another attacking part to the support by translating the other attacking part relative to the support via the sliding link, in which the other attacking part is different from the attacking part.

[0020] The process may also include the optional steps of • Detach the leaking section from the support by sliding the leaking section relative to the support via the sliding joint, • attach another leakage part to the support by translating the other leakage part relative to the support via the sliding link, in which the other leakage part is different from the leakage part, so as to preserve aerodynamic continuity of the measurement acquisition device. DESCRIPTION OF THE FIGURES

[0021] Other features, objectives and advantages of the invention will become apparent from the following description, which is purely illustrative and not limiting, and which should be read in conjunction with the accompanying drawings on which:

[0022] Figure 1 shows a simplified diagram of a test bench for a turbomachine.

[0023] Figure 2 is a perspective view of a measuring device according to the invention.

[0024] Figure 3 schematically illustrates a section of the device according to a first method of embodiment of the invention.

[0025] Figure 4 schematically illustrates a section of the device according to a second method of embodiment of the invention.

[0026] Figure 5 schematically illustrates a section of the device according to a third method of embodiment of the invention.

[0027] Throughout the figures, similar elements bear identical references. DETAILED DESCRIPTION OF THE INVENTION

[0028] In the present application, upstream and downstream are defined with respect to the normal flow direction of the gas flow through the turbomachine test bench. Furthermore, the main axis X of the turbomachine is the axis of rotation of its parts rotors. The axial direction corresponds to the direction of the X axis and a radial direction is a direction perpendicular to this axis and passing through it.

[0029] Figure 1 schematically represents a section of a test turbomachine 10 belonging to a test bench, in a plane containing the principal axis X. This disclosure extends more generally to various turbojet engine architectures. The turbomachine 10 comprises, from upstream to downstream in the direction of gas flow, a fan 11, one or more compressor stages 17, a combustion chamber 14, one or more turbine stages 15, and a gas exhaust nozzle. The turbojet also includes a nacelle 20 for transmitting forces to a structure on which the turbojet will be mounted.

[0030] During performance tests, a significant number of measurements of physical characteristics are carried out, for example pressure or temperature measurements, in order to characterize the flow of a gas stream in a flow channel 12 or 13 of the turbomachine 10.

[0031] These performance tests are carried out on a test bench for a turbomachine 10. The test bench may include all the features of the turbomachine, and therefore be considered a test turbomachine 10, even if this turbomachine is not necessarily intended to be incorporated into an aircraft, and therefore not used to make such an aircraft fly. Alternatively, the test bench may include only some of the features of the turbomachine 10, these features including the flow channel 12 or 13 and the means for generating a gas flow in this channel.

[0032] The measurements taken during these performance tests are performed by an intrusive measurement acquisition device 1 placed in axial and radial positions of the gas flow according to predefined measurement planes. Examples of measurement planes in the flow channel 12 or 13 of the test bench for turbomachine 10 are numbered PI to P5 in [Fig. 1].

[0033] The measurement acquisition device 1 is arranged in the flow channel 12 or 13 so that, when the turbomachine test bench 10 is in operation, the sensors 6 of the measurement acquisition device can properly measure the characteristics of the gas flow circulating in the turbomachine test bench 10. Conventionally, the measurement acquisition device 1 extends substantially radially in the flow channel 12 or 13 with respect to the main axis X.

[0034] Generally, the measurement acquisition device 1 comprises an airfoil having a leading edge and a trailing edge. The leading edge extends opposite the flow of the gas entering the turbomachine test bench 10. It corresponds to the forward part of the airfoil that faces the gas flow and divides the gas flow into an intrados flow and in an extrados flow. The trailing edge 32, for its part, corresponds to the rear part of the aerodynamic profile, where the intrados and extrados flows meet.

[0035] The measurement acquisition device 1 comprises a support 2 adapted to be attached to the test bench for turbomachine 10, a leading part 3 adapted to face a gas flow circulating in the test bench for turbomachine, when the support 2 is attached to the test bench for turbomachine 10, and a sensor 6 arranged on the leading part 3 to acquire a characteristic measurement of the gas flow, when the support 2 is attached to the test bench for turbomachine 10.

[0036] The support 2 is an elongated body along the radial axis Y. In the embodiment illustrated in [Fig.2], the device comprises several sensors 6 arranged at the leading edge of the measurement acquisition device 1, along the radial axis Y.

[0037] The leading portion 3 is another elongated body extending along the radial axis Y and defining the leading edge of the measurement acquisition device 1. In other words, the leading portion 3 comprises the leading edge of the aerodynamic profile of the measurement acquisition device 1.

[0038] The measurement acquisition device 1 has the particularity that the attack part 3 delimits a groove 30, and the support 2 includes a rail 20 extending in the groove 30 so as to form a sliding connection.

[0039] The attacking part 3 is mounted on the support 2 by a sliding joint allowing translational movement. The translation of the attacking part 3 relative to the support 2 is along the direction defined by the radial axis Y. The attacking part 3 is detachable from the support 2. This allows for quick replacement of the attacking part 3 with a new one, for example in case of a defect, or when requirements change during a series of tests.

[0040] The groove 30 of the attack part 3 may include one or more portions extending along the radial axis Y. Similarly, the rail 20 of the support 2 may include one or more portions forming a projection extending along the radial axis Y.

[0041] As schematically illustrated in [Fig. 3], the sliding joint is formed by the groove 30 and the rail 20 and allows translational movement of the leading portion 3 relative to the support 2 along the translational direction Y. For example, the rail 20 has an external surface, and the groove 30 has an internal surface. Translational guidance of the leading portion 3 on the support 2 can be achieved by direct contact between the internal surface of the groove 30 and the external surface of the rail 20. This contact prevents the leading portion 3 from moving in any direction other than the translational direction Y. This advantageously allows for maintaining rigidly in place the attack part 3 on the support 2 after fixing the measurement acquisition device 1 on the test bench for turbomachine 10.

[0042] The support 2 can have a solid or hollow structure. A partially hollow structure has the advantage of reducing the amount of material required to manufacture the support, and thus reducing the manufacturing cost of the device. This advantageously allows for the routing of the sensor 6's wiring 7.

[0043] With reference to [Fig. 2], the support 2 includes a hollow portion defining a channel 21 extending along the Y-direction. The channel 21 is intended to receive one or more cables 7. The cables 7 allow, for example, the supply of power by connecting the sensor 6 to a power source, or allow the transfer of information between the sensor 6 and a processing unit. The channel 21 may have a substantially circular cross-section, in order to avoid a concentration of stresses that could lead to deformation of the support 2.

[0044] The presence of the measurement acquisition device 1 induces changes in the flow, and consequently disrupts the operation of the turbomachine test bench 10. In order to reduce the uncertainty of the measurements taken, the measurement acquisition device 1 must be rigidly held in position in the channel 12 or 13. It is subjected to significant mechanical stresses imposed by the gas flow in the flow channel 12 or 13 of the operating turbomachine test bench 10. The geometry of the support structure 2 is designed to withstand these mechanical stresses with a safety margin.

[0045] The support 2 is made of a rigid and resistant material, for example, a metal alloy. Preferably, the support 2 comprises a metal profile including the rail. This prevents vibrations of the support 2 during a test, which could impair the quality of the measurements. The support 2 is designed so that, when fixed to the turbomachine test bench 10, it distributes the stresses along the main X-axis. Improving the mechanical strength of the support 2 allows the use of a thinner leading edge 3 and thus reduces the overall size of the measurement acquisition device 1 in the channel 12 or 13 of the turbomachine test bench 10.

[0046] In the embodiment of the device shown in [Fig. 2], the support 2 extends along the Y-axis from a first end to a second end. The support 2 includes at its first end a base 5 forming a foot. The base 5 includes a circular opening 51 allowing the base 5 to be reversibly attached to the turbomachine test bench 10. For example, a threaded screw can be screwed into the opening 51, allowing the support 2 to be attached to the turbomachine test bench 10 via the base 5. Reversible attachment of the support 2 to the turbomachine test bench 10 allows removal device 1 for acquiring measurements following damage or a change in need.

[0047] Preferably, the base 5 has several holes distributed over its surface allowing the measurement acquisition device 1 to be fixed at several points. This makes it possible to distribute the mechanical stresses at different points on the base 5.

[0048] After fixing, the support 2 is held rigidly in position. This prevents vibrations that could alter the quality of the measurements.

[0049] Alternatively, the base 5 can be fixed to an oblong that can translate along the principal axis X of the turbomachine test bench 10. The oblong is then fixed to the turbomachine test bench 10 before testing. This allows the measurement plane to be changed without requiring dismantling of the measurement acquisition device 1.

[0050] Advantageously, the measurement acquisition device 1 includes a locking element 52 for preventing translation of the driving portion 3 relative to the support 2. The locking element 52 may be a pressure screw screwed into the driving portion 3 so as to press the support 2. Such a locking element 52 allows the driving portion 3 to be easily removed when necessary, while rigidly holding the driving portion 3 in place on the support 2 during a test. The driving portion 3 may include several locking elements to distribute the stresses.

[0051] The geometry of the structure of the attacking part 3 is designed so as to resist with a safety margin significant mechanical stresses, in a complementary manner to the structure of the support 2.

[0052] The sensor 6 is arranged on the drive portion 3 to measure a characteristic of the gas flow in the channel 12 or 13 of the turbomachine test bench 10. The sensor 6 may, in particular, be a pressure and / or temperature probe. By way of example, the temperature probe may be a thermocouple type, and the pressure probe may be a Kiel probe. Such probes are well known to those skilled in the art and will therefore not be described in detail.

[0053] The sensor 6 typically comprises a nozzle 61 and a sensing element 62 disposed inside the nozzle 61. The nozzle 61 is located at the leading edge of the leading portion 3 and oriented so that the gas flow enters the nozzle 61 and comes into contact with the sensing element 62 of the sensor. The length and diameter of the nozzle 61 may vary depending on the type of sensor intended to be disposed in the nozzle 61.

[0054] In the illustrated embodiment, the nozzle 61 extends from the leading edge 3 in the direction of the gas flow. The nozzle 61 can be obtained by an extrusion process, for example by molding. Alternatively, the nozzle 61 can be fixed to the leading edge 3 after fabrication at a fixing area, for example thanks to a pressure screw. Advantageously, the fixing area has a smooth surface that does not alter the external surface of the attack part 3. For example, the fixing area can be coated with hardening paste.

[0055] In an embodiment not shown, the nozzle can be integrated inside the attack part 3. This can reduce the intrusiveness of the measurement acquisition device 1.

[0056] Preferably, several sensors can be arranged on the leading edge 3. This allows several characteristic quantities of the gas flow to be measured simultaneously during a test. In this embodiment, several nozzles are distributed along the leading edge 3 and positioned at the leading edge of the measurement acquisition device 1. The nozzles can be equally distributed on the external surface of the leading edge 3, or advantageously concentrated in measurement areas of interest, for example, at a boundary layer.

[0057] In the illustrated embodiment, the sensor 6 includes an orifice 63 extending from the sensing element 62 through the drive portion 3 to the channel 21 of the support 2. The support 2 includes a hollow portion for connecting the orifice 63 to the inside of the channel 21 intended to receive the cables. The hollow portion allows cables to pass between the channel 21 extending into the support 2 and the sensor 6. For example, it could be circular holes arranged along the support 2 in the Y-direction. Alternatively, the hollow portion could be a slot extending along the support 2.

[0058] Generally, the cables 7 connecting the sensors are placed inside the support 2. This helps to limit the impact of the measurement acquisition device 1 on the gas flow in the channel 12 or 13. Furthermore, the sensors can be easily replaced in case of a fault or modified when requirements change. This contributes to improving the modularity of the measurement acquisition device 1.

[0059] Figures 3 to 5 schematically illustrate the section of several embodiments of the device in a transverse plane which is orthogonal to the direction of translation Y.

[0060] In the second embodiment shown in [Fig. 4], the leading portion 3 comprises a first hook 33 curved upon itself and a third hook 34 curved upon itself. The opposite hooks 33 and 34 define the groove 30. The support 2 comprises a second hook 23 and a fourth hook 24. The back-to-back hooks 23 and 24 define the rail 20.

[0061] A surface of the first hook 33 is in contact with a surface of the second hook 23 so that the first hook 33 is engaged with the second hook 23. The surfaces in contact form the sliding joint along the translation direction Y. The presence of the hooks 23, 33 allows a rigid fixing of the attacking part 3 on the support 2, allowing a translational movement along the sliding joint in the translation direction Y orthogonal to the plane of [Fig.4].

[0062] The fourth hook 24 is engaged with the third hook 34. The sliding connection along the translational direction Y is also made via a surface of the third hook 34 in contact with a surface of the fourth hook 24. The addition of new contact surfaces ensures good resistance of the hyperstatic sliding connection to mechanical stresses.

[0063] As explained previously, the leading part 3 delimits the leading edge of the measurement acquisition device 1 when the support 2 is attached to the turbomachine test bench 10. The leading part 3 has an external surface 31. The external surface 31 comprises a first side, and a second side opposite the first side with respect to the leading edge.

[0064] The hook 23 includes an end extending parallel to the first side of the external surface 31 of the leading part 3. The hook 24 includes an end extending parallel to the second side of the external surface of the leading part 3. This makes it possible to compensate for significant mechanical stresses, particularly at the level of the intrados and extrados of the measurement acquisition device 1, when it is subjected to a flow of gas, and to increase the mechanical resistance of the measurement acquisition device 1.

[0065] In the embodiment shown in [Fig.3], the support 2 includes an external surface, part of which delimits the trailing edge of the aerodynamic profile of the device 1. The trailing edge corresponds to the downstream part of the measurement acquisition device 1, where separate gas flows at the leading edge meet.

[0066] The trailing edge length may depend on the operating conditions of the turbomachine test bench 10 or its position in skid, for example if the gas flow enters the turbomachine test bench 10 with a high angle of incidence, i.e. not parallel to the axis of the turbomachine X.

[0067] Preferably, the fourth hook is symmetrical to the second hook. For example, the support 2 has a symmetrical structure along an axis of symmetry passing through a point on the leading edge and a point on the trailing edge.

[0068] Thus, the second bracket 23 is symmetric to the fourth bracket 24 with respect to the axis of symmetry.

[0069] Preferably, the support 2 includes the hollow portion 21 defining the channel for the passage of cables. The support 2 may further include a hollow portion 22. The hollow portion 22 is a cylindrical opening extending along the length of the support. It allows for the reception of a means for fixing the support 2 to the base 5, for example, a screw.

[0070] The support 2 comprises two hollow portions extending on either side of the axis of symmetry, and defining an inner surface of the hooks 23, 24. The presence of hollow portions in the support 2 allows less material to be used and reduces the manufacturing cost of the support 2.

[0071] Preferably, the third hook is symmetrical to the first hook. With reference to [Fig. 4], the leading edge 3 has a symmetrical structure about the axis of symmetry passing through a point on the leading edge and a point on the trailing edge. The first hook 33 is symmetrical to the third hook 34 with respect to the axis of symmetry.

[0072] Fig. 5 represents a section of the measurement acquisition device 1 according to a third embodiment in the transverse plane orthogonal to the translation direction Y. In this embodiment, the measurement acquisition device 1 differs from that shown in Fig. 4 according to the following characteristics.

[0073] The measurement acquisition device 1 includes a trailing part 4 opposed to the attack part 3 with respect to the support 2. The trailing part 4 is mounted on the support 2 by a second sliding connection, in a manner detachable with respect to the support 2. The second sliding connection can be made along the translation direction Y defined by the first sliding connection.

[0074] Preferably, the leading portion 3 and the trailing portion 4 are independently detachable. This increases the modularity of the measurement acquisition device 1. In the event of a defect in the trailing portion 4, or during a change in test configuration, for example, the trailing portion 4 can be removed from the support 2 by translation along the sliding joint and replaced with a new trailing portion. Generally, the leading portion 3 can be modified without affecting the trailing portion 4.

[0075] To form the sliding connection between the trailing portion 4 and the support 2, the trailing portion 4 may define a second groove, and the support 2 may include a second rail extending into the second groove. The second groove may extend over a portion or the entire length of the trailing portion 4 in the radial direction Y. Similarly, the second rail may extend over all or part of the support 2. The rail and the groove have external surfaces adapted to be in contact and guide the translation of the trailing portion 4 relative to the support 2 in the translational direction Y, preventing relative movement in any other direction.

[0076] The trailing edge 4 has an external surface 41 defining the trailing edge of the aerodynamic profile of the measurement acquisition device 1. In order to reduce the intrusiveness of the measurement acquisition device 1 and to limit the uncertainty of the measurements, the external surface 31 of the leading edge 3 delimiting the leading edge of the measurement acquisition device 1 and the external surface 41 of the trailing edge The trailing edge of the device exhibits aerodynamic continuity at the junction. Asperities and discontinuities on the external surface of the measurement acquisition device 1 may alter the gas flow.

[0077] The sliding joint defines lines extending along the translational direction Y on the external surface of the measurement acquisition device 1. Preferably, the support 2, the leading portion 3, and the trailing portion 4 have complementary external surfaces that extend continuously. Advantageously, the external surface 41 of the trailing portion 4 extends tangentially from the external surface 31 of the leading portion 3.

[0078] Preferably, the leading edge 3 and the trailing edge 4 completely cover the support 2. In this embodiment, the external surface of the leading edge 3 and the external surface of the trailing edge 4 fully define the aerodynamic profile of the measurement acquisition device 1. The structure of the support 2 does not directly affect the aerodynamic profile. The support 2 plays a structural role by transmitting forces to the principal axis X of the turbomachine test bench 10. This also reduces the manufacturing and design costs of the measurement acquisition device 1. For different tests, the support 2 can be retained, while the aerodynamic profile of the measurement acquisition device 1 can be varied by modifying the leading edge 3 and / or the trailing edge 4.

[0079] With reference to [Fig. 5], the support 2 has a structure symmetrical with respect to the axis of symmetry passing through the leading and trailing edges of the measurement acquisition device 1. The support 2 has a first rail formed by the second hook 23 and the fourth hook 24. The support 2 further has a second rail opposite the first rail. The second rail comprises a hook 25 facing the second hook 23 and a hook 26 facing the fourth hook 24.

[0080] The hooks 23 and 25 have an end extending substantially in a first direction in opposite directions. The trailing portion 4 comprises a first side and a second side opposite the first side with respect to the trailing edge. The first side of the trailing portion 4 extends the first side of the leading portion 3, in a tangential direction parallel to the first direction in which the hooks 23 and 25 extend. This increases the mechanical strength of the measurement acquisition device 1 by compensating for external forces.

[0081] The hooks 24 and 26 have an end extending substantially in a second direction in opposite directions. The second side of the trailing portion 4 extends the second side of the leading portion 3, in a tangential direction parallel to the second direction in which the hooks 24 and 26 extend. This allows increasing the mechanical resistance of the device by compensating for 1 of the intrados forces.

[0082] Generally, the support 2, the leading edge 3, and the trailing edge 4 may have complementary geometries, including, for example, one or more axes of symmetry. This allows for better compensation of aerodynamic forces, particularly tensile forces due to low pressure on the upper and lower surfaces of the measurement acquisition device 1.

[0083] Preferably, the leakage portion 4 includes a locking element 53 for preventing translation of the leakage portion 4 relative to the support 2. The locking element 53 may be a pressure screw screwed into the leakage portion 4 so as to press against the support 2. Such a locking element allows the leakage portion 4 to be easily removed if necessary, while rigidly holding the leakage portion 4 in contact with the leading edge 3 and the support 2 during testing. Several locking elements may be arranged on the leakage portion 4 to distribute the stresses.

[0084] The other features of the measurement acquisition device 1 described above in relation to [Fig.4] are included in the embodiment shown in [Fig.5].

[0085] The leading edge 3 is made of a resistant material, for example a metal alloy. The leading edge can be produced, without limitation, by extrusion or molding. A rigid material provides sufficient structure to the measurement acquisition device 1. Preferably, the material composing the leading edge 3 is less rigid than the material composing the support 2. This allows the support 2 to compensate for a significant portion of the mechanical stresses.

[0086] The leakage portion 4 may be made of a resistant material, for example a metal alloy. The leakage portion 4 may be made of the same material as the attack portion 3.

[0087] The support 2 and the attack part 3 can be dimensioned independently or in combination with the leakage part 4 in vibration to prevent the measurement acquisition device 1 from resonating on a reference operating regime of the test bench for turbomachine 10.

[0088] To increase the modularity of the measurement acquisition device 1, the attack portion 3 can be composed of several removable attack portions, which translate along the sliding joint. Similarly, the escape portion 4 can be composed of several removable escape portions, which translate along the sliding joint.

[0089] The measurement acquisition device 1, as described in this disclosure, is to be placed in a turbomachine test bench 10 in order to perform measurements of the characteristics of a gas flow circulating in the turbomachine test bench 10. During a test, the measurement acquisition device 1 is fixed on the test bench for turbomachine 10 so that the attack part 3 faces the gas flow.

[0090] For example, in the configuration illustrated in [Fig.1], the measurement acquisition device 1 is placed in the vein 13 downstream of the blower 11.

[0091] One advantage of the device as described in this disclosure is that it facilitates assembly and disassembly between different tests. For example, when evaluating the performance of a turbomachine geometry at different operating speeds, it is beneficial to adapt the aerodynamic profile of the measurement acquisition device 1. Indeed, a particular leading-edge profile of the device 1, defined by the leading portion 3, may be more or less effective for a given turbomachine operating speed. A highly streamlined aerodynamic profile at low turbomachine operating speeds minimizes the impact on the gas flow but is less mechanically robust. A different profile, more resistant to aerodynamic disturbances, may be better suited at high operating speeds.

[0092] This disclosure also relates to a method of using the measurement acquisition device 1, comprising the steps of detaching the attacking part 3 from the support 2 by translating the attacking part 3 relative to the support 2 via the sliding link, and then reattaching another attacking part to the support 2 by translating the other attacking part relative to the support 2 via the sliding link.

[0093] If the measurement acquisition device 1 needs to be modified, for example due to a change in requirements or following damage, the outer annular casing delimiting the upper part of the turbomachine test bench can be removed. One end of the support 2 is free to allow passage of the leading edge 3. To remove the leading edge 3, the fastening element 52 can be removed. The leading edge 3 is detached from the support 2 by sliding it towards the free end of the support 2 via the sliding joint.

[0094] Another attack element can be attached to the support 2 by translating it relative to the support, from the free end of the support, via the sliding joint. When requirements change, this other attack element differs from the attack element 3. For example, it may have a different number of sensors or a different aerodynamic profile. If the attack element 3 is damaged, it can be replaced with an identical one.

[0095] According to the measurement plane where the measurement acquisition device 1 is fixed, and if the dimension of the test bench for turbomachine 10 allows it, the attack part 3 can be detached from the support by translation without requiring the removal of the outer annular envelope 24.

[0096] In the configuration where the measurement acquisition device 1 includes a leakage part 4 that is removable independently of the attack part 3, the method of dismantling and reassembling the leakage part 4 is carried out in a similar manner.

[0097] The method of using the device 1 may include the steps of detaching the leaky part 4 from the support 2 by translating the leaky part 4 relative to the support 2 via the sliding link, and reattaching another leaky part to the support 2 by translating the other leaky part relative to the support 2 via the sliding link, so as to preserve an aerodynamic continuity of the measurement acquisition device 1.

[0098] Indeed, a first attack part and a second attack part can be interchangeable with the same trailing part 4. However, in order to guarantee good aerodynamic continuity of the trailing part 4 with the second attack part 3, the trailing part 4 can also be replaced.

[0099] To increase the adaptability of the measurement acquisition device 1, the sensor type can be changed without disassembling the drive unit. The sensor's sensing element 62 can be removed from the nozzle 61 and replaced with another sensing element, for example, if the sensor is defective or unsuitable. The presence of the cable 7 at the orifice 63 eliminates the need to disassemble the drive unit 3 and the support 2, thus reducing the time and cost of sensor changes.

Claims

Demands

1. Measurement acquisition device (1) comprising: • a support (2) adapted to be attached to a turbomachine test bench (10), • a leading part (3) adapted to face a gas flow circulating in the turbomachine test bench (10), when the support (2) is attached to the turbomachine test bench (10), • a sensor (6) arranged on the leading part (3) to acquire a characteristic measurement of the gas flow, when the support (2) is attached to the turbomachine test bench (10), characterized in that the leading part (3) delimits a groove (30), and the support (2) includes a rail (20) extending in the groove (30) so as to form a sliding connection, the leading part (3) being mounted detachably relative to the support (2).

2. Measurement acquisition device (1) according to claim 1, wherein • the sliding link permits translation of the attacking part (3) relative to the support (2) in a translation direction (Y), • the attacking part (3) comprises a first hook (33) curved upon itself in a transverse plane which is orthogonal to the translation direction (Y), • the support (2) comprises a second hook (23) curved upon itself in the transverse plane, the second hook (23) being engaged with the first hook (33).

3. Measurement acquisition device (1) according to the preceding claim, in which: • The attacking part (3) has an external surface (31), the external surface (31) comprising a first side, • the first hook (33) delimits the first side.

4. Device (1) according to any one of claims 2 and 3, wherein: • the attacking part (3) includes a third hook (34) curved on itself in the transverse plane, • the support (2) includes a fourth hook (24) curved on itself in the transverse plane, the fourth hook (24) being engaged with the third hook (34).

5. Measurement acquisition device (1) according to the preceding claim, wherein the third hook (34) is symmetrical to the first hook (33) and / or the fourth hook (24) is symmetrical to the second hook (23).

6. Device (1) for acquiring measurements according to any one of claims 4 and 5 in their dependence on claim 3, wherein: • the external surface (31) comprises a leading edge and a second side opposite to the first side with respect to the leading edge, • the third hook (34) delimits the second side.

7. Measurement acquisition device (1) according to any one of the preceding claims, wherein the support (2) delimits a channel (21) for the passage of an electrical cable (7) connecting the sensor (6) to another piece of equipment.

8. Measurement acquisition device (1) according to any one of the preceding claims, comprising a blocking element (52) for blocking a translation of the attacking part (3) relative to the support (2).

9. Measurement acquisition device (1) according to any one of claims 1 to 8, comprising a trailing part (4) opposed to the attack part (3) with respect to the support (2), the trailing part (4) being mounted on the support (2) by a second sliding connection, in a manner detachable from the support (2).

10. Measurement acquisition device (1) according to claim 9, wherein the attacking part (3) and the leakage part (4) are independently detachable.

11. A measurement acquisition device (1) according to any one of claims 9 and 10, wherein • the trailing portion (4) defines a groove, and • the support (2) comprises a rail extending in the groove defined by the trailing portion (4), the second connection slide being formed by the groove delimited by the trailing part and the support rail (2).

12. Measurement acquisition device (1) according to any one of claims 9 to 11, • the attacking part (3) has an external surface (31), • the trailing part (4) has a second external surface (41) which extends tangentially from the external surface (31).

13. Device (1) for acquiring measurements according to any one of claims 9 to 12, • the sliding link allows a translation of the attacking part (3) relative to the support (2) in a direction of translation, • in a transverse plane which is orthogonal to the direction of translation, the attacking part (3) and the trailing part (4) completely cover the support (2).

14. Assembly comprising: • A test bench for turbomachine (10), • a measurement acquisition device (1) according to any one of the preceding claims, the measurement acquisition device (1) being fixed to the test bench for turbomachine (10) such that the driving part (5) faces a flow of gas circulating in the test bench for turbomachine (10).

15. A method using a measurement acquisition device (1) according to any one of claims 1 to 13 or an assembly according to claim 14, the method comprising: • detaching the attacking part (3) from the support (2) by translating the attacking part (3) relative to the support (2) via the sliding link, • attaching another attacking part to the support (2) by translating the other attacking part relative to the support (2) via the sliding link, wherein the other attacking part is different from the attacking part (3).

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