FR3051908B1 - ANTI-BENDING DEVICE FOR TURBOMACHINE PROBE - Google Patents

Abstract

The invention relates to a device (7) for non-embedded acquisition of data in a vein (5) of a turbomachine (3). For this purpose, fixing means (19) hold a probe (9) to fix it towards an end radially remote from the vein and displacement means (21) make it possible to move the probe in the vein, radially, tangentially and in rotation around a radial direction. The means (19) for attaching the probe are located radially outside an outer casing (15) and a spacer (25) is fixed to the turbomachine between the inner (13) and outer casings where the probe passes through a passage (31) of a movable part (27) with a limited flexural amplitude.

Description

Anti-bending device for turbomachine probe

The present invention relates to an anti-bending device for a moving probe on a motor or a test motor part.

More specifically, is concerned an assembly comprising: - a turbomachine, or part of a turbomachine, functional test having a main axis (X) and comprising: - a vein of fluid, and - radially to said axis, an inner housing and an outer casing, and - an on-board data acquisition device in the vein, the device comprising: - a probe whose first end is disposed in the vein, for measuring aerodynamic performance, and which passes through openings of the inner and outer housings, - a holding frame of the probe vis-à-vis the turbomachine or turbine engine part, the frame comprising: - fixing means of the probe to fix it to a second end opposite to the first, and - means of movement of the probe relative to the vein, to move it radially, tangentially across the vein and rotating about a radial direction or sensiblem radial ent.

Note that in the present description: - "radially" has direction (overall) radially to the main axis (X) which is the axis of revolution of the turbomachine, or part of a turbomachine, and the axis along which flows generally upstream (AM) downstream (AV), the flow of fluid in the vein where the tests are to be conducted, and - "axially" has (broadly) direction following or parallel to the axis principal (X).

On an engine or part of a test engine, such as a turbomachine, or part of a turbomachine, a sensor (also called an instrumentation or meter) that is not on board must measure aerodynamic performance, such as pressures and / or temperatures, at least in a certain plane, that is to say at a location along the aforementioned main axis, and this typically for speeds of rotation between two predetermined terminals.

It may in particular be rotational speeds of the turbomachine turbine, or part of a turbomachine, between about 10,000 and 20000 rpm.

The sensor's ability to collect reliable information is paramount. This is the purpose of the test campaign.

The probe that takes the measurements is usually housed in the airflow of the vein where the test is conducted. The gaseous fluid circulating in the vein exerts mechanical forces on it. The probe is also subjected to the different vibrations generated by the test machine. These vibrations may interact with the eigen modes of the probe.

In addition, the probe typically has to acquire its data at different locations in the vein.

For this, the instrumentation must favorably be able to move during the test in: radial translation (slide substantially radially, in approximation or spacing with respect to said axis, hence along Z), tangential translation (to approach or to away in the 3rd dimension of Figure 1, so along Y), - radial rotation (rotate about a vertical axis in Figure 1).

Such a rotation will make it possible to obtain a skid angle so that the measurements take account of the flow of air that flows sideways, because of the blades present in the turbomachine, or part of the turbomachine, upstream of the probe. measurement.

To conduct the expected tests problems have been encountered, since a probe for such tests is typically in the form of a long rod with (at least) a point to take a measurement at its first end. .

Being mobile, the probe can not be maintained effectively today in place, if it is only at one place, towards its second end, by a kind of clamp belonging to said fixing means. It is then a kind of vertical overhang that is imposed on this probe. But this "overhang" between the first and second ends will be further amplified by vibrations occurring during the tests. This can lead to distorted measurements, rendering the test obsolete.

In addition, these vibrations may cause the rod of the probe to resonate on the modes specific to the latter (interaction motor frequency / eigen modes). The mechanical integrity of the probe can therefore be threatened. It could break, damage the machine, force the test to stop.

After having tested different other solutions, the inventors have found a solution to the above problem by proposing: that the fixing means of the probe, to fix it towards the said second end, are situated radially outside the outer casing; and that the holding frame of the probe, which is open towards the openings of the inner and outer casings, comprises: radially to said axis, between the inner and outer casings, a spacer which is fixed to the turbomachine, and a movable part that can move relative to the spacer, tangentially across the vein, the mobile part belonging to said means for moving the probe and having a passage through which the probe passes with a bending amplitude limited to screw or around said fixing means.

Thus, the natural amplitude of flexion of the probe that could lead to its destruction without this possibility of lateral stop in the passage will be limited via the passage through said moving part that will cross the probe, in at least one location, radially axis, between the inner and outer casings, this movable part being held in a guided manner by the spacer fixed to the turbomachine, or part of a turbomachine.

It will be understood that said natural amplitude of bending of the probe will be the amplitude of bending it can reach by beating freely around the fastening means which hold it at one end, if subjected to vibrations, and this until breaking or at least structural damage.

In this way, a relevant compromise has thus been found between a position of the probe fixing means, and a priori actuators of said displacement means, beyond the outer casing, imposing a large length of the probe, and a control vibrations in tests of it.

This solution will not hinder the aforementioned possible displacements of the probe necessary for the conduct of these tests, but on the other hand will significantly modify its vibration behavior.

In fact, the risks associated with the vibratory effects will be even more limited if: the amplitude of flexion of the probe, maintained only at its second end by said fixing means, and the respective lateral positions of this probe and of the passage in the mobile part are such that, during an operation of the turbomachine, or part of a turbomachine, under test, the probe can come to bear laterally against an inner wall of said passage, substantially perpendicular to the aforementioned axis, before the mechanical integrity of the probe is altered.

A mechanical effect on the vibrations will then be obtained.

In practice, in order to obtain a fully satisfactory result, it was also necessary to play on different parameters to find a good balance between the need to carry out the necessary movements of the probe and this control of the vibratory conditions. It is in this context that two more precise solutions are made to allow a translation of the probe, tangentially across the vein: - the first, with a said moving part comprising at least one slide located, radially auditing axis, between the inner and outer casings - the second, with a movable portion comprising at least one cylinder / cylinder connection, again located radially to said axis, between the inner and outer casings.

In the slide option, it may be preferred that the movable portion comprises two substantially tangential parallel rails, transverse to said axis and interconnected by uprights, each slide having a said passage for the probe.

Thus, it will be possible in particular to provide that these amounts are aligned along the Y axis, therefore perpendicular to the aforementioned axis X, so that in this direction of movement across the vein, there is a relevant control of the movements.

It will be noted moreover that, typically in this direction Y, the probe has not hitherto been maintained at all except towards its second end, and all the more so that oblong passages were reserved to it if, as typically, it had a general "L" shape, bent near its first measurement end.

In the cylinder / cylinder connection option, it may instead be preferred that said movable part comprises a tube: - which will form said passage through which the probe, - which may extend, radially to said axis, in a radially through opening of the spacer open to the openings of the inner and outer casings, and which will be rigidly secured to this cylinder / cylinder connection.

This solution will help limit the risk of hyperstatism.

In addition, it will then be possible: - that the tube extends radially to said axis, beyond the cylinder / cylinder connection, - the cylinder / cylinder link is located radially to said axis, between the inner and outer casings and that the means for moving the probe relative to the vein, tangentially across the vein, comprise an actuator slider which can extend radially to said axis, which will then be rigidly secured to the tube of the movable part and which will be crossed by the probe.

A significant length of guide of the probe along the Z axis can thus be provided, the length of the tube being substantially equal to, or close to, the radial distance between the housings.

Part of the vibration control of the probe passing through the stability of the holding frame associated with it, it may further be provided that, radially to said axis (X), between the inner and outer casings, the spacer comprises several parts. fastened together a portion, radially closest to the inner casing, which will be fixed to this inner casing.

Furthermore, if, as probably, the aforementioned means for moving the probe relative to the vein comprise respectively radial, tangential and rotational actuators, it may be found relevant that the tangential actuator acts on said movable part which can then slide the along a fixed structure with said portion of the spacer radially closest to the outer casing and which will be traversed by the probe.

Thus, the mechanical fastening chain will be: structure / part of the spacer radially closest to the outer casing / part of the spacer radially closest to the inner casing (fixed radially with the other part) / inner casing. The invention will, if necessary, be better understood and other details, characteristics and advantages of the invention will become apparent on reading the following description given by way of nonlimiting example with reference to the appended drawings, in which: FIG. 1 is a schematic partial longitudinal half-section of an aeronautical turbine engine part, here an area of the turbine; FIG. 2 is a section completed by symmetry along the line 11-11 of FIG. 1; FIG. a section identical to that of FIG. 2, in particular a first embodiment of the part of the data acquisition device situated between the inner and outer casings; FIG. 4 is a local perspective with the view of FIG. 3, and FIGS. 5, 6 are two views in local perspective with broken parts, in particular of a second embodiment of the part of the data acquisition device. between the inner and outer casings.

Figures 1-6, is thus shown an assembly 1 comprising a turbomachine, or a portion of a turbomachine, 3 functional test having a main axis X and having a vein 5 of fluid and a device 7 non-embedded data acquisition in vein 5, via at least one probe 9.

The probe 9 may allow measurements of pressure and / or temperature in the vein 5.

The device 7 is non-embedded in the sense that the probe 9 aims to provide results under test conditions. Consequently, the device 7 is not supposed to be on board an operational turbomachine, on a daily basis.

As illustrated in FIG. 1, the device 7 comprises the probe 9 and a frame 11 holding the probe with respect to the turbomachine or part of a turbomachine.

The probe 9 is axially elongated and has two axial ends 9a, 9b, the first 9a of which can be bent, so that, when the probe is placed axially in a direction Z that is radial to the X axis (FIG. 2), this first end 9a can be extend along the X axis, in particular with respect to the flow in the vein 5.

This first end 9a of the probe 9 is disposed in the vein 5 to measure aerodynamic performance, such as temperature and / or pressure parameters.

The probe 9 passes through openings 13a, 15a of radially inner casings 13 and outer casings 15, respectively, of the turbomachine, or part of a turbomachine, 3.

The vein 5 is defined, radially to the axis X (thus along the axis Z, figures 1,2 in particular), between a radially internal surface 130 of the inner casing 13 and a radially outer surface 170 of a central casing 17 of the turbomachine, or part of a turbomachine, 3.

The frame 11 comprises: means 19 for fixing the probe 9 to fix it towards a second end 9b radially opposite the first 9a, and - means 21 for moving the probe relative to the vein, in order to be able to move radially (double arrow 23a Figure 2), tangentially across the vein (double arrow 23b Figure 2, Y axis) and rotated about a radial direction or substantially radial Z (double arrow 23c Figure 2).

The means 19 for fixing the probe 9 may define a clamp which holds the rod 90 of the probe towards its radially outer end 9b.

The fixing means 19 move with the probe.

Thus blocked only at one end 9b radially distant from the vein 5, and besides it may be poorly guided in its movements, the probe 9, which has a natural amplitude (A1) of flexion around the fastening means 19, is strongly likely to enter significant vibrations around its axis of elongation (here the Z axis) during the tests, in particular because of the flow in the vein 5.

In addition, for example, FIG. 2 shows that the means 19 for attaching the probe are here located radially outside the outer casing 15.

This may be the consequence of the size of the turbomachine, or part of the turbomachine 3 which does not accommodate between the inner casing 13 and outer 15 part of the test device, as typically the displacement means 21.

To avoid these disadvantages and / or consequences of setting up certain means, such as the means 19 and / or 21, it is proposed that the frame 11 for holding the probe 9, which is open towards the openings of the inner and outer casings. 13,15, comprises: radially to said axis X, between these inner and outer casings, a spacer 25 which is fixed to the turbomachine, or part of a turbomachine 3, and a movable part 27 able to move on the spacer 25, tangentially across the vein (Y axis).

This mobile part 27 belongs to the means 21 for moving the probe 9.

And the movable portion 27 has (at least) a passage 31 through which the probe 9 so that its natural amplitude (A1) bending is limited, that is to say that the possible amplitude of bending (A2) here, around the Z axis, the probe passing through the passage (s) 31 is smaller than the amplitude A1 around the fixed point constituted by the fixing by the means 19. As detailed below, this is in particular established along the transverse axis Y and, along the X axis, from upstream to downstream, since the bending of the probe is, during the test, due to the flow of fluid in the vein 5.

In practice, this limitation of bending of the probe may be promoted, by ensuring that, if this probe is held only by said fastening means 19, beyond the outer casing 15, the respective lateral positions of the probe 9 and of the passage 31 in the movable part 21 are such that, during an operation of the turbomachine, or part of a turbomachine, under test, the probe can bear laterally against an inner wall 310 of said passage, substantially perpendicular to the axis X (hence here following Y), and this before its mechanical integrity is altered.

Two embodiments are more particularly presented hereinafter concerning the manner of controlling this amplitude in flexion along its axis of elongation of the probe, here around the axis Z along which the fixing clip of the means 19 is placed.

In the first embodiment of FIGS. 3,4, the movable portion 27 of the frame 11 holding the probe comprises two slides 33a, 33b located, radially to the X axis, between the inner casings 13 and outer 15, to allow a translation of the probe, tangentially across the vein 5, so here along the lateral axis Y.

A single slide, for example at half height would have been possible.

These two slides 33a, 33b are mutually parallel, substantially tangential, thus transverse to the X axis and interconnected by uprights 35a, 35b.

Each slide has, here along the Z axis, a passage 31 for the probe 9 which passes through it.

In addition, each slide 33a, 33b slides in two parallel lateral grooves of which only one is shown in the sectional views of FIGS. 3.4: upper groove 37a or lower 37b.

The amounts 35a, 35b are arranged side by side along the lateral axis Y, to promote the resistance to bending in the direction of movement of the slide (s), since it is necessary to be able to shift the measurement by the probe 9 on either side of the axis X, therefore along the lateral axis Y.

In FIG. 2, it may be noted that, radially to the axis X (hence here following Z) and between the inner casings 13 and outer casing 15, the spacer 25 comprises several parts, here three 25a, 25b, 25c fastened together ( for example by screwing 39, Figure 3).

One of these parts is attached to the turbomachine. Here, the one 25c radially closest to the inner casing 13 is fixed to this casing, in FIG.

In FIG. 4, it can be seen that the visible passage 31 is oblong along the Y axis because it is in this direction that the probe will have been first mounted with its terminal elbow 9a, before turning it into the vein 5 around the Z axis. The clearance with the probe in the cylindrical central portion of circular section 311, as is the elongate body of the probe, is weak.

In the second embodiment of FIGS. 5, 6, the movable portion 27 of the frame 11 holding the probe comprises (at least) a sliding cylinder / cylinder connection 43 located, radially to the axis X, between the inner casings 13 and outer 15, to allow the desired translation of the probe, tangentially across the vein, thus following the Y axis here.

In FIGS. 5, 6, the probe is not illustrated to better see the passage 31 along the axis Z.

Indeed, in this version, the movable portion 27 comprises a tube 45: - which has axially said passage 31 traversed by the probe, - which extends radially to the axis X, in a radially through opening 47 of the spacer, open towards the openings 13a and 15b of the inner and outer casings, and - which is rigidly secured to the cylinder / cylinder connection 43. In this respect, the tube 45 crosses tightly, along the Z axis, (without play) the slide 430 of the link 43.

And to promote the guidance and vibration control of the probe 9, in this version, this tube 45 extends, radially to the axis X, beyond the cylinder / cylinder connection 43, as can also be seen FIG. 2.

Moreover, this cylinder / cylinder connection 43 is located, always along Z, thus radially to the X axis, between the inner casings 13 and outer casing 15, in order to provide guidance and vibratory control for example substantially at mid-height. housings, so close enough to the free end 9a.

As for the means 21 for moving the probe relative to the vein 5, tangentially across this vein (hence here along the Y axis), they comprise an actuator slider 51 which can extend along the Y axis.

The actuator slide 51 is rigidly secured to the tube 45 of the movable portion 27 and is traversed by the probe 9 along the radial axis Z.

And to provide the other three desired movements to allow the probe 9 to record the necessary data from the vein 5, the means 21 of displacement comprise respectively radial 53, tangential 49 and rotational actuators 55. The tangential actuator 49 acts on the actuator slide 51, which can slide along a structure 57 extending along the Y axis and traversed by the probe 9.

This structure 57 and fixed, in FIG. 3, with the part of the spacer 25 radially closest to the outer casing 15.

The actuators 49, 53, 55 are located radially beyond the outer casing 15.

It is the same with the structure 57 which radially surmounts the spacer 25.

Thus, the movements of the probe 9 can be made as follows: - in radial (X axis), according to the arrows 23a, Tz translation: via the radial actuator 53, the probe, maintained by the fastening means 19, passing to through the actuator slide 51, via a radial guide tube 61 fixed to the slide 51 and to the means 19 on which the actuator 53 acts, - laterally or tangentially (Y axis), translation Ty: via the tangential actuator 49 which acts above the structure 57, on the actuator slider 51, thus driving the probe 9 according to the arrows 23b, - in rotation, about the Z axis, rotation Rz: via the actuator at 55 which can for example act on the fastening means 19, and thus rotate the probe around this axis.

In the second solution of FIGS. 5, 6, the radial tube 63 corresponds to the radial guide tube 61 and is fixed rigidly to the tube 45 of the mobile part 27, coaxially along the Z axis; see figure 6.

Among the advantages of the generic solution presented here, it is possible to note: a solution which limits the flexion of the probe without restricting its translation, a solution which provides this probe with degrees of freedom Tz, Ty, Rz., Without excessive complications or too risky approach, - a solution that avoids vibratory resonance regimes by dimensioning the parts so as to modify the eigen modes, - once the principle found, a solution that allows to have only one slide ( as shown in FIGS. 5,6 to simplify the assembly and reduce the risks of hyper-droop, - a solution that can integrate into the restricted space of the spacer.

Claims (10)

1. An assembly comprising: - a turbomachine, or part of a turbomachine, (3) functional test having a main axis (X) and comprising: - a vein (5) of fluid, and - radially to said axis, an internal casing (13) and an outer casing (15), and - a non-embedded data acquisition device (7) in the vein, the device comprising: - a measurement probe (9) having a first end (9a) disposed in the vein (5) and which passes through the openings of the inner and outer casings, - a frame (11) for holding the probe vis-à-vis the turbomachine or turbine engine part, the frame, which is open to the openings of the inner (13) and outer (15) housings, comprising: - means (19) for fixing the probe to fix it towards a second end (9b) opposite to the first one, said means (19) for fixing the probe being located radially outside the outer casing (15), and - radially to said axis, between the casings i external and external, a spacer (25) which is fixed to the turbomachine, characterized in that the frame (11) for holding the probeincludes: - means (21) for moving the probe relative to the vein, configured to being able to move it radially, tangentially across the vein and rotating about a radial or substantially radial direction, and - a movable portion (27) configured to move relative to the spacer, tangentially across the vein, the movable portion belonging to said probe moving means and having a passage (31) through which the probe passes so that the bending amplitude of the probe is limited around said fixing means (19). 2. Assembly (1) according to claim 1, wherein the bending amplitude of the probe (9), maintained only at its said second end (9b) by said fixing means (19), and the respective lateral positions of said probe and the passage (31) in the movable part (27) are such that, during an operation of the turbomachine, or part of a turbomachine, (3) under test, the probe can come to bear laterally against an inner wall of said passage (31), substantially perpendicular to said axis, before its mechanical integrity is altered. 3. Assembly (1) according to any preceding claim, wherein the movable portion (27) comprises at least one slide (43) located radially to said axis, between the inner casings (13) and outer (15), for allow a translation of the probe (9), tangentially across the vein (5). 4. Assembly (1) according to any one of the preceding claims, wherein the movable portion (27) comprises two rails (33a, 33b) substantially tangential parallel (35a, 35b), transverse to said axis and interconnected by uprights, each slide having a said passage (31) for the probe (9). 5. The assembly (1) according to claim 1, wherein the movable portion (27) comprises at least one cylinder / cylinder connection located radially to said axis, between the inner and outer casings, to allow a translation of the probe (9), tangentially across the vein (5). 6. The assembly (1) according to claim 5, wherein the movable portion (27) comprises a tube (45): - which forms said passage (31) traversed by the probe (9), - which extends radially to said axis in a radially through opening of the spacer (25) open towards the openings of the inner and outer casings, and - which is firmly fixed to the cylinder / cylinder connection, 7. Assembly (1) according to claim 6, wherein: - the tube (45) extends radially to said axis beyond the cylinder / cylinder connection, the cylinder / cylinder connection is located radially to said axis, between the inner and outer casings, and, - the means (21) for moving the probe (9) relative to the vein (5), tangentially across the vein, comprise an actuator slide which can extend radially to said axis, which is rigidly secured to the tube of the movable part (27) and which is traversed by the probe. 8. Assembly (1) according to any one of the preceding claims wherein, radially to said axis, between the inner and outer housings, the spacer (25) comprises a plurality of parts fixed together, a portion radially closest to the inner casing ( 13), which is fixed to said inner housing. 9. An assembly according to claim 8 attached to claim 1 or any one of claims 2 to 6, wherein the means (21) for moving the probe (9) relative to the vein (5) comprise actuators (49, 53, 55) respectively radial, tangential and in rotation, the tangential actuator acting on said movable part (27) which can slide along a structure (57) fixed with said part of the spacer (25) radially closest to the outer casing (15) and which is traversed by the probe. 10. Assembly (1) according to any one of the preceding claims, wherein the probe (9) measurements is a pressure measurement sensor (s) and / or temperature (s).