A microcombustor outlet measurement device

Abstract

The present application relates to the technical field of aero-engine testing, and specifically relates to a micro combustion chamber outlet measuring device, which comprises: a casing assembly, which comprises an inner casing and an outer casing that are sleeved and installed, a cooling interlayer is reserved between the inner casing and the outer casing, a gas passage is formed in the inner side of the inner casing in the axial direction, an installation notch is arranged on the inner casing, and a combustion chamber test piece is adapted to be fixedly installed at the installation notch; a measuring driving mechanism is fixedly installed on the outer casing, a rotary measuring assembly is installed on the driving end of the measuring driving mechanism, the rotary measuring assembly is installed at the installation notch, the rotary measuring assembly is arranged towards the exhaust port of the combustion chamber test piece, and an overflow gap is reserved at the edge of the rotary measuring assembly and the installation notch. The casing assembly is formed by sleeving the inner casing and the outer casing, the probe lead can be led out from the cooling interlayer. The problem that the cable cannot be arranged due to the narrow outlet flow channel of the micro combustion chamber can be effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of aero-engine testing technology, and specifically to a miniature combustion chamber outlet measuring device. Background Technology

[0002] Micro gas turbine engines have shown broad application prospects due to their advantages such as low cost, high performance, small size, light weight, and easy maintenance. As one of the core components of a micro gas turbine engine, the performance of the combustion chamber directly affects the engine's overall efficiency, stability, and emissions levels. Therefore, conducting combustion chamber component tests to accurately obtain characteristic parameters such as the temperature, pressure, and pollutant distribution of the outlet gas is crucial for combustion chamber design optimization and performance verification.

[0003] In conventional full-annular combustion chamber component testing, the commonly used measurement device consists of a rotatable sensing plate mounted at the combustion chamber outlet, on which various test probes, such as temperature probes, pressure probes, and fuel composition probes, are installed. The mounting plate is driven by a hollow drive shaft extending from the cold end of the test section, enabling scanning measurements of parameters across the entire circumference of the combustion chamber outlet. The hollow drive shaft serves two purposes: transmitting torque and providing a path for the test probe cables leading from the mounting plate to transmit signals to an external data acquisition system. This forward-drive layout places the drive system and cable leads on the lower-temperature intake side, ensuring reliable operation.

[0004] However, for micro gas turbine engines, the combustion chamber structure is extremely compact, with very limited inner diameter and height dimensions of the outlet flow channel. When using the conventional forward-drive measurement device described above, the extremely small space at the combustion chamber outlet results in a severe mismatch between the inner diameter of the combustion chamber outlet and the radial dimensions of the test probe and its lead wires. It is impossible to machine a hollow drive shaft with a sufficient inner diameter to pass through it while ensuring structural strength. Even if the probe and wiring harness dimensions are forcibly reduced, insufficient strength and signal attenuation will significantly reduce test reliability. This means that existing measurement devices cannot achieve real-time, accurate, and reliable measurement of the entire annular surface parameters of the micro-combustion chamber outlet, hindering the smooth conduct of performance tests on the entire annular component of the micro-combustion chamber. Summary of the Invention

[0005] In view of this, the present invention provides a micro combustion chamber outlet measuring device to solve the problem of low testing reliability when testing micro combustion chambers using the forward-transmission measuring device scheme in the prior art.

[0006] This invention provides a miniature combustion chamber outlet measuring device, comprising:

[0007] The casing assembly includes an inner casing and an outer casing that are installed together, with a cooling jacket reserved between the inner casing and the outer casing. The inner casing has an axially formed gas passage, and the inner casing has an installation notch. The combustion chamber test piece is suitable for fixed installation at the installation notch. The measuring drive mechanism is fixedly installed on the outer casing. A rotating measuring component is installed at the drive end of the measuring drive mechanism. The rotating measuring component is installed at the mounting notch and is arranged facing the exhaust port of the combustion chamber test piece. An overflow gap is reserved at the edge of the rotating measuring component and the mounting notch.

[0008] The miniature combustion chamber outlet measuring device operates by fixing the combustion chamber test piece at the mounting notch of the inner casing. The high-temperature gas generated by the combustion chamber test piece flows along the gas passage inside the inner casing and exits from the exhaust port at the end of the gas passage. A measuring drive mechanism, fixedly mounted on the outer casing, is activated, driving a rotating measuring component mounted at the same mounting notch to measure the gas parameters flowing through its vicinity. During this process, the cooling jacket between the inner and outer casings, and the flow gap between the rotating measuring component and the edge of the mounting notch, can be used to circulate cooling medium for thermal protection of the casing assembly. By using an inner and outer casing assembly to form a jacketed structure, integrating the combustion chamber test piece and the rotating measuring component at the mounting notch of the inner casing, and fixing the measuring drive mechanism to the outer casing, a compact measuring device layout with external drive, internal measurement, and thermal protection is constructed, allowing the probe leads on the rotating measuring component to be led out from the cooling jacket. It can effectively avoid the problem of the inability to arrange the drive shaft and cable in the traditional center-through-shaft measurement scheme due to the extremely narrow size of the outlet flow channel of the micro combustion chamber, thus enabling the measurement of the gas parameters at the outlet of the micro combustion chamber.

[0009] In one alternative embodiment, the measuring drive mechanism is arranged perpendicular to the axis of the gas passage, and the drive end of the measuring drive mechanism is installed in conjunction with the rotating measuring component through a steering linkage component.

[0010] The rotational power of the measuring drive mechanism is transmitted vertically through the steering linkage assembly, converting it into torque that drives the rotating measuring component to rotate around the gas passage axis. This allows the drive unit to be positioned outside the casing assembly, away from the high-temperature gas area, thus protecting the measuring drive mechanism from the influence of the high-temperature gas and ensuring its operational reliability.

[0011] In one optional embodiment, the steering linkage assembly includes a first bevel gear and a second bevel gear. The first bevel gear is installed at the output end of the measuring drive mechanism, and the second bevel gear is fixedly connected to the rotating measuring assembly. The first bevel gear and the second bevel gear mesh and drive each other, and the first bevel gear and the second bevel gear are arranged perpendicular to each other.

[0012] The measuring drive mechanism drives the first bevel gear to rotate. The first bevel gear, through meshing with the second bevel gear, transmits rotational motion about a direction perpendicular to the gas passage axis to the second bevel gear, causing the second bevel gear and its fixedly connected rotating measuring component to rotate about the gas passage axis. This achieves reliable vertical steering and efficient torque transmission of the rotational motion. The bevel gear structure has high load-bearing capacity and a compact arrangement, enabling power transmission between the radially arranged measuring drive mechanism and the axially arranged rotating measuring component within a limited cooling space.

[0013] In one alternative embodiment, the steering linkage assembly further includes a driven mounting shaft rotatably mounted on the inner side wall of the outer casing, and a second bevel gear fixedly mounted on the driven mounting shaft.

[0014] The driven mounting shaft is rotatably supported on the inner wall of the outer casing via bearings and other structures. The second bevel gear is fixedly mounted on the driven mounting shaft, and the rotating measuring assembly is mounted on one end of the driven mounting shaft. When the first bevel gear drives the second bevel gear, torque is transmitted to the driven mounting shaft through the second bevel gear, causing the driven mounting shaft and the rotating measuring assembly to rotate together. The driven mounting shaft, as the connection and support component between the second bevel gear and the rotating measuring assembly, provides a stable axis of rotation for the second bevel gear and transmits the radial and axial loads of the rotating component to the outer casing through bearing support. This effectively reduces the non-torsional load on the second bevel gear, improving the meshing accuracy, transmission smoothness, and service life of the bevel gear pair. Simultaneously, the independent support structure of the driven mounting shaft ensures a higher coaxiality between the rotation center of the rotating measuring assembly and the axis of the combustion chamber test piece, improving the accuracy of the test probe's measurement position.

[0015] In one alternative embodiment, the rotating measurement assembly includes a sensing part mounting plate and at least one measurement probe, the measurement probe being detachably mounted on the sensing part mounting plate.

[0016] During the measurement process, the sensing plate rotates under the drive, and the measuring probe mounted on the sensing plate rotates synchronously, thereby periodically scanning the gas flow field at the outlet of the combustion chamber test piece and collecting parameters such as temperature, pressure or gas composition.

[0017] In one optional embodiment, a mounting groove is provided on the sensing part mounting plate, the depth direction of the mounting groove is arranged along the axial direction of the gas passage, and the measuring probe is installed in the mounting groove.

[0018] During installation, the measuring probe is inserted into the mounting slot on the sensing plate and fixed in place. As the sensing plate rotates, the sensitive end of the measuring probe extends axially into the gas passage to measure the gas parameters.

[0019] In one optional embodiment, the sensing part mounting plate is an annular structure, and a sealing baffle is fixedly installed on the inner ring of the sensing part mounting plate. An exhaust gap is reserved between the sealing baffle and the combustion chamber test piece, and an overflow gap is reserved between the sealing baffle and the inner casing.

[0020] After the high-temperature combustion gas flows out of the combustion chamber test piece outlet, the majority enters the downstream gas passage through the exhaust gap between the sealing baffle and the combustion chamber test piece. Simultaneously, a small amount of gas may attempt to leak from the gap between the rotating measuring component and the stationary component. The flow gap between the sealing baffle and the inner casing can be used to form a cooling gas barrier through a cooling medium to prevent leakage of high-temperature gas to the rear of the mounting plate and the drive mechanism area, protecting components such as the measuring drive mechanism from high-temperature damage and improving the safety and durability of the device in harsh thermal environments.

[0021] In one alternative embodiment, a cold air jacket is provided in the cooling jacket downstream of the mounting notch, and an air vent is provided on the inner casing, the air vent connecting the cold air jacket to the gas passage.

[0022] Under pressure, cooling gas seeps into or is injected into the combustion gas passage through vents in the inner casing wall. This achieves directional cooling of the inner casing wall downstream of the mounting notch. The cooling gas entering the combustion gas passage through the vents forms a gas film on the high-temperature wall surface, isolating the high-temperature combustion gas and reducing the wall temperature. This enhances the thermal protection of critical components of the inner casing, preventing overheating, deformation, or ablation.

[0023] In one alternative embodiment, a coolant jacket is provided in the cooling jacket downstream of the mounting notch. The coolant jacket includes an inlet jacket and a return jacket along the radial direction of the casing assembly, and an overflow hole is provided between the inlet jacket and the return jacket.

[0024] Coolant flows in from the inlet of the inlet jacket, absorbs heat from the combustion chamber during the flow, and the heated coolant flows into the return jacket through the flow holes, and finally flows out from the outlet of the return jacket, forming a forced circulation path for the coolant.

[0025] In one alternative embodiment, the liquid inlet jacket is arranged close to the gas passage, and the return jacket is located on the side of the liquid inlet jacket away from the gas passage.

[0026] The coolant first enters the inlet jacket located near the combustion chamber, absorbing heat transferred from the inner casing. The heated coolant then flows through the flow holes connecting the inlet and return jackets to the return jacket located outside the inlet jacket, and finally exits from the return jacket, completing one cooling cycle. The use of a coolant jacket divided into inlet and return layers creates a highly efficient forced convection cooling circulation path. The coolant directly contacts the high-temperature area in the inlet jacket, resulting in high heat absorption efficiency; the flow holes guide it to the return jacket for discharge, achieving an orderly organization of hot and cold fluids, avoiding coolant short-circuiting or stagnation, and improving cooling efficiency. It is particularly suitable for areas with extremely high heat loads, effectively controlling wall temperature, and its cooling capacity is higher than that of air-cooled systems. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of the miniature combustion chamber outlet measuring device provided in an embodiment of the present invention.

[0029] Figure 2 This is a schematic diagram of the steering linkage component provided in an embodiment of the present invention.

[0030] Figure 3 This is a schematic diagram of the structure of the rotation measurement component provided in an embodiment of the present invention.

[0031] Figure 4 for Figure 3 A schematic diagram of the mounting groove in the middle K direction.

[0032] Figure 5 This is a schematic diagram of the coolant jacket structure provided in an embodiment of the present invention.

[0033] Figure 6 This is a schematic diagram of the structure of the cooling air interlayer provided in an embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures: 1. Casing assembly; 101. Inner casing; 102. Outer casing; 103. Cooling jacket; 104. Gas passage; 105. Flow gap; 106. Cold air jacket; 107. Vent hole; 108. Coolant jacket; 1081. Inlet jacket; 1082. Return jacket; 109. Flow hole; 2. Measurement drive mechanism; 201. Drive component; 202. Drive shaft; 3. Steering linkage assembly; 301. 1. Bevel gear; 302. Second bevel gear; 303. Driven mounting shaft; 3031. Stator; 3032. Rotor; 3033. Bearing; 3034. Flexible fitting ring; 4. Rotary measuring assembly; 401. Sensing part mounting plate; 4011. Mounting plate body; 4012. Mounting groove; 4013. Pressing cover plate; 4014. Sealing baffle; 402. Measuring probe; 5. Combustion chamber test piece; 6. Probe lead wire. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] The following is combined Figures 1 to 6 The following describes embodiments of the present invention.

[0037] According to an embodiment of the present invention, a miniature combustion chamber outlet measuring device is provided, comprising a casing assembly 1 and a measuring drive mechanism 2.

[0038] like Figure 1As shown, the casing assembly 1 adopts a double-layer mounting structure, including an inner casing 101 and an outer casing 102. The inner casing 101 is coaxially fitted into the internal space of the outer casing 102, and an annular cooling jacket 103 is formed between the outer side of the inner casing 101 and the inner side of the outer casing 102. The cooling jacket 103 extends along the axial direction of the entire casing assembly 1 to form a flow space for cooling gas. The inner space of the inner casing 101 forms a gas passage 104. The gas passage 104 is formed along the axial direction of the casing assembly 1 and runs through the entire inner casing 101. The gas passage 104 has an installation notch on the cylinder of the inner casing 101 at the installation position of the combustion chamber test piece 5. The installation notch is a through hole structure that runs through the wall thickness of the inner casing 101. The shape and size of the installation notch are adapted to the outer contour of the combustion chamber test piece 5. An installation edge is machined on the edge of the inner casing 101 upstream of the installation notch. The combustion chamber test piece 5 is suitable for being fixedly installed on the installation edge upstream of the installation notch by interference fit, bolt connection or welding, forming a sealed fit with the installation edge.

[0039] The measuring drive mechanism 2 is fixedly installed on the outer wall of the outer casing 102 by welding, bolting, or flange connection. The installation position of the measuring drive mechanism 2 is located upstream of the installation position of the rotating measuring component 4. The drive end of the measuring drive mechanism 2 is connected to the input end of the rotating measuring component 4 through a coupling or gear transmission pair. The rotating measuring component 4 is arranged as a whole in the space corresponding to the installation notch, and the installation position of the rotating measuring component 4 is directly opposite the exhaust port of the combustion chamber test piece 5. There is a predetermined axial distance between the measuring end face of the rotating measuring component 4 and the exhaust port end face of the combustion chamber test piece 5. An annular flow gap 105 is reserved between the outer periphery of the rotating measuring component 4 and the edge of the installation notch. The flow gap 105 connects the cooling jacket 103 and the gas passage 104, and the cooling medium can flow between the cooling jacket 103 and the gas passage 104 through the flow gap 105.

[0040] The miniature combustion chamber outlet measuring device operates as follows: The combustion chamber test piece 5 is fixedly installed at the mounting notch of the inner casing 101. The combustion chamber test piece 5 is sealed to the edge of the mounting notch of the inner casing 101 via its mounting edge. Combustion occurs inside the combustion chamber test piece 5, generating high-temperature gas. This high-temperature gas flows along the gas passage 104 inside the inner casing 101 and is finally discharged from the exhaust port at the end of the gas passage 104 to downstream components. The measuring drive mechanism 2, fixedly installed on the outer casing 102, starts operating. The drive end of the measuring drive mechanism 2 outputs rotational torque, driving the rotating measuring component 4, installed at the same mounting notch, to rotate. During rotation, the rotating measuring component 4 continuously measures and collects the temperature, pressure, and composition parameters of the gas flowing near the exhaust port of the combustion chamber test piece 5. During operation, a cooling medium is continuously introduced into the pre-reserved cooling interlayer 103 between the inner casing 101 and the outer casing 102. The cooling medium absorbs heat from the casing assembly 1, achieving thermal protection. Meanwhile, part of the cooling medium in the cooling jacket 103 flows through the flow gap 105 reserved at the edge of the rotating measuring component 4 and the mounting notch, and performs convective cooling on the probe, mounting plate and transmission components of the rotating measuring component 4.

[0041] The casing assembly 1 is constructed by using an inner casing 101 and an outer casing 102 installed in an inner and outer manner. A cooling interlayer 103 is formed between the inner casing 101 and the outer casing 102. An installation notch is made on the inner casing 101 and the combustion chamber test piece 5 is fixedly installed at the installation notch. The measurement drive mechanism 2 is fixedly installed on the outer casing 102 and the rotating measurement component 4 is installed at the installation notch, with the rotating measurement component 4 facing the exhaust port of the combustion chamber test piece 5. A flow gap 105 is reserved at the edge of the rotating measurement component 4 and the installation notch. This creates a compact measurement device layout with external drive, internal measurement, and interlayer cooling function. The probe lead 6 on the rotating measurement component 4 can be led out through the cooling interlayer 103, which can effectively avoid the problem that the drive shaft and cable cannot be arranged in the traditional center through-shaft measurement scheme due to the extremely narrow size of the outlet flow channel of the micro combustion chamber itself. This enables the measurement of the gas parameters at the outlet of the micro combustion chamber.

[0042] In one embodiment, the measuring drive mechanism 2 is arranged perpendicular to the axis of the gas passage 104, and the drive end of the measuring drive mechanism 2 is installed in conjunction with the rotating measuring component 4 via a steering linkage assembly 3. In this embodiment, the overall installation direction of the measuring drive mechanism 2 is perpendicular to the central axis of the gas passage 104, and the rotational axis of the drive end of the measuring drive mechanism 2 forms a 90° spatial angle with the central axis of the gas passage 104. The input side of the steering linkage assembly 3 is fixedly connected to the drive end of the measuring drive mechanism 2 via a coupling or spline, and the output side of the steering linkage assembly 3 is fixedly connected to the central hub of the rotating measuring component 4 via bolts or welding. The rotational power of the drive end of the measuring drive mechanism 2 is converted into torque to drive the rotating measuring component 4 to rotate around the central axis of the gas passage 104 through the vertical steering transmission mechanism inside the steering linkage assembly 3.

[0043] The measurement drive mechanism is arranged perpendicular to the axis of the gas passage 104, allowing the drive motor, which serves as the drive component 201, to be positioned outside the casing assembly 1, away from the high-temperature gas area. This avoids the risk of the measurement drive mechanism 2 being directly exposed to the high-temperature gas, ensuring that the motor, reducer, and other electrical and mechanical components of the measurement drive mechanism 2 operate at relatively low ambient temperatures, thus improving the reliability and service life of the measurement drive mechanism 2. Simultaneously, the vertical arrangement saves axial space in the gas passage 104, making the entire measurement device more compact axially, which is particularly suitable for miniature combustion chamber test devices with limited axial length.

[0044] Furthermore, such as Figure 2 As shown, the steering linkage assembly 3 includes a first bevel gear 301 and a second bevel gear 302. The first bevel gear 301 is installed at the output end of the measuring drive mechanism 2, and the second bevel gear 302 is fixedly connected to the rotating measuring assembly 4. The first bevel gear 301 and the second bevel gear 302 mesh and drive each other, and the first bevel gear 301 and the second bevel gear 302 are arranged perpendicular to each other.

[0045] Specifically, the inner bore of the first bevel gear 301 is coaxially fixed to the outer cylindrical surface of the output end of the measuring drive mechanism 2 via a key connection or interference fit, with the conical tooth surface of the first bevel gear 301 facing the axial direction of the gas passage 104. The inner bore of the second bevel gear 302 is coaxially fixed to the outer cylindrical surface of the central hub of the rotating measuring assembly 4 via a key connection or interference fit, with the conical tooth surface of the second bevel gear 302 facing the output end of the measuring drive mechanism 2. The conical tooth surfaces of the first bevel gear 301 and the second bevel gear 302 contact each other in a perpendicularly intersecting meshing plane to form a gear pair. The number of teeth of the first bevel gear 301 and the second bevel gear 302 can be matched according to the transmission ratio requirements. The rotation axis of the first bevel gear 301 and the rotation axis of the second bevel gear 302 intersect each other perpendicularly in space.

[0046] The measuring drive mechanism 2 drives the first bevel gear 301 to rotate around a horizontal axis perpendicular to the axis of the gas passage 104. The bevel teeth of the first bevel gear 301 push the bevel teeth of the second bevel gear 302 in the meshing area, converting the rotational motion output by the measuring drive mechanism 2 around the horizontal axis into rotation of the second bevel gear 302 and its fixedly connected rotating measuring component 4 around the axis of the gas passage 104 through gear meshing. The bevel gear transmission structure achieves reliable vertical steering of the rotational motion and efficient torque transmission. The bevel gear structure has high load-bearing capacity and a compact arrangement, enabling power transmission between the radially arranged measuring drive mechanism 2 and the axially arranged rotating measuring component 4 within the limited space of the cooling jacket 103.

[0047] In this embodiment, the tooth profile of the bevel gear can be a straight bevel gear, a helical bevel gear, or a spiral bevel gear, selected according to the requirements of transmission smoothness and load-bearing capacity. The materials of the first bevel gear 301 and the second bevel gear 302 can be high-strength alloy steel, stainless steel, or high-temperature alloy, and the gear surface can be carburized, quenched, nitrided, or plated to improve wear resistance and corrosion resistance. In an alternative embodiment, the steering linkage assembly 3 can also be a worm gear pair, with the worm installed at the output end of the measuring drive mechanism 2, and the worm gear fixedly connected to the rotating measuring assembly 4.

[0048] In this embodiment, to ensure the stability of the rotation of the rotating measuring component 4, the driven mounting shaft 303 is rotatably mounted on the inner wall of the outer casing 102, and the second bevel gear 302 is fixedly mounted on the driven mounting shaft 303. The driven mounting shaft 303 adopts a combination structure of stator 3031 and rotor 3032. The stator 3031 is a cylindrical shell with a central through hole. The outer periphery of the stator 3031 extends radially outward to form a flange mounting edge. The flange mounting edge is fixedly connected to the inner wall of the outer casing 102 by circumferentially distributed bolts. A flexible mating ring 3034 is installed in the middle region of the inner cylindrical surface of the stator 3031, and bearing seat holes 3033 are machined at both ends of the inner cylindrical surface of the stator 3031. The rotor 3032 is a hollow shaft with open ends for cooling gas flow. The outer cylindrical surfaces at both ends of the rotor 3032 are machined as bearing mounting journals for the rotor 3033. The rotor 3032 is coaxially mounted in the central through-hole of the stator 3031, forming an annular rotational clearance between the outer cylindrical surface of the rotor 3032 and the inner cylindrical surface of the stator 3031. Two angular contact ball bearings 3033 are used, installed between the bearing housings at both ends of the stator 3031 and the bearing mounting journals at both ends of the rotor 3032. The inner ring of the bearing 3033 is interference-fitted with the rotor 3032 journal, and the outer ring is interference-fitted with the bearing housing in the stator 3031. The bearings 3033 provide combined radial and axial support for the rotor 3032. The flexible fitting ring 3034 is made of a high-temperature resistant elastic alloy plate with an annular open structure. The flexible fitting ring 3034 is embedded in the annular groove on the inner cylindrical surface of the stator 3031. The inner cylindrical surface of the flexible fitting ring 3034 and the outer cylindrical surface in the middle of the rotor 3032 form an interference fit.

[0049] The inner bore of the hub of the second bevel gear 302 is fixedly fitted onto the end of the rotor 3032 of the driven mounting shaft 303 via a keyway connection. One end face of the hub of the second bevel gear 302 abuts against the shoulder of the rotor 3032 for axial positioning, while the other end face is axially locked in place by a lock nut and a locking washer. The center hub of the rotation measuring assembly 4 is bolted to the flange edge at the end of the rotor 3032 of the driven mounting shaft 303. When the first bevel gear 301 drives the second bevel gear 302 to rotate, the second bevel gear 302 drives the rotor 3032 of the driven mounting shaft 303 to rotate relative to the stator 3031. The rotor 3032 of the driven mounting shaft 303 then drives the rotation measuring assembly 4 to rotate around the axis of the combustion chamber test piece 5 at the mounting notch.

[0050] The driven mounting shaft 303 serves as the connection and support component between the second bevel gear 302 and the rotary measuring assembly 4. It provides a stable rotation axis for the second bevel gear 302 and, through the connection between the stator 3031 and the outer casing 102, transmits the radial and axial loads of the rotating component to the outer casing 102, effectively reducing the non-torsional loads on the second bevel gear 302. This structure improves the meshing accuracy, transmission smoothness, and service life of the bevel gear pair. Simultaneously, the independent support structure of the driven mounting shaft 303 ensures a higher coaxiality between the rotation center of the rotary measuring assembly 4 and the axis of the combustion chamber test piece 5, enhancing the accuracy and repeatability of the test probe's measurement position. The stator 3031 provides a fixed support for the entire driven mounting shaft 303 through the connection between the mounting edge and the outer casing 102. The rotor 3032 rotates inside the stator 3031 through the bearing 3033 to realize the transmission of rotational motion. The flexible fitting ring 3034 compensates for the coaxiality deviation between the stator 3031 and the rotor 3032 through interference fit and provides appropriate rotational damping to prevent the rotor 3032 from vibrating at high speed.

[0051] In one embodiment, such as Figure 3 and Figure 4 As shown, the rotating measuring assembly 4 includes a sensing element mounting plate 401 and at least one measuring probe 402, which is detachably mounted on the sensing element mounting plate 401. The sensing element mounting plate 401 has a disc-shaped or annular structure. The central hub of the sensing element mounting plate 401 is fixedly connected to the output end of the steering linkage assembly 3 via a key or bolt connection. Driven by the steering linkage assembly 3, the sensing element mounting plate 401 rotates around the axis of the combustion chamber test piece 5 downstream of the mounting notch in the gas passage 104. Multiple mounting slots 4012 are evenly distributed circumferentially on the surface of the sensing element mounting plate 401. The measuring probes 402 are detachably mounted on the mounting slots 4012 of the sensing element mounting plate 401 in a radially extending manner. The number of measuring probes 402 is determined according to the required measurement point density and can be one, two, three, or more. The base of the measuring probe 402 is detachably connected to the sensing part mounting plate 401 by means of threaded connection, snap-fit ​​connection or wedge clamping. The measuring end of the measuring probe 402 is close to the outer wall surface of the outlet end of the combustion chamber test piece 5 for parameter measurement.

[0052] During the measurement process, the sensing element mounting plate 401 rotates under drive, and the measuring probe 402 mounted on the sensing element mounting plate 401 rotates synchronously, thereby periodically scanning the gas flow field at the outlet of the combustion chamber test piece 5 and collecting parameters such as temperature, pressure, or gas composition. When it is necessary to replace or repair the measuring probe 402, the measuring probe 402 can be removed from the sensing element mounting plate 401; when it is necessary to adjust the type of measurement parameter, different types of measuring probes 402 can be installed on the sensing element mounting plate 401.

[0053] In this embodiment, a mounting groove 4012 is provided on the sensing part mounting plate 401. The depth direction of the mounting groove 4012 is arranged along the axial direction of the gas passage 104, and the measuring probe 402 is installed in the mounting groove 4012. Specifically, a plurality of mounting grooves 4012 penetrating the plate body are evenly distributed circumferentially on the plate body of the sensing part mounting plate 401. The extension direction of each mounting groove 4012 is parallel to the axial direction of the gas passage 104. The mounting groove 4012 forms an opening on the upstream end face of the plate body. The cross-sectional shape of the mounting groove 4012 can be rectangular, dovetail-shaped, or trapezoidal. The base of the measuring probe 402 is embedded in the mounting groove 4012, and the measuring end of the measuring probe 402 extends radially inward and faces the outlet end of the combustion chamber test piece 5. The clamping cover plate 4013 is fixed to the downstream end face of the sensing part mounting plate 401 by countersunk screws. The inner end face of the clamping cover plate 4013 axially presses the base of the measuring probe 402 into the bottom of the mounting groove 4012 to prevent the measuring probe 402 from slipping axially during the rotation measurement process.

[0054] During installation, the measuring probe 402 is inserted into the mounting groove 4012 on the sensing part mounting plate 401 from the upstream side and fixed by the axial clamping of the clamping cover plate 4013. When the sensing part mounting plate 401 rotates, the sensitive end of the measuring probe 402 extends axially into the gas passage 104 to measure the gas parameters. The depth direction of the mounting groove 4012 is arranged along the axial direction of the gas passage 104, so that the installation direction of the measuring probe 402 is consistent with the direction of the rotation axis. This facilitates reliable axial fixation of the measuring probe 402 by the clamping cover plate 4013, avoiding problems such as probe deformation, stress concentration, or installation difficulties that may be caused by radial fixation. At the same time, the structure of the mounting groove 4012 can automatically wed the measuring probe 402 to the two side walls of the mounting groove 4012 under the action of rotational centrifugal force, improving the stability and reliability of the measuring probe 402 on the sensing part mounting plate 401, ensuring that the measuring probe 402 will not loosen or shift during high-speed rotation measurement, and ensuring the accuracy and consistency of the measurement data.

[0055] In one embodiment, the sensing element mounting plate 401 is an annular plate structure. An annular sealing baffle 4014 is coaxially fixed to the inner ring region of the sensing element mounting plate 401 by bolts or welding. The sealing baffle 4014 is located downstream of the outlet end of the combustion chamber test piece 5. A predetermined radial distance is maintained between the inner periphery of the sealing baffle 4014 and the outer cylindrical surface of the outlet end of the combustion chamber test piece 5 to form an exhaust gap. The radial width of the exhaust gap is determined according to the exhaust flow rate and pressure loss requirements of the combustion chamber test piece 5. A predetermined axial distance is maintained between the upstream end face of the sealing baffle 4014 and the edge of the mounting notch of the inner casing 101 to form a flow passage gap 105.

[0056] After the high-temperature gas flows out from the outlet of the combustion chamber test piece 5, the majority of it enters the downstream gas passage 104 through the exhaust gap between the sealing baffle 4014 and the combustion chamber test piece 5. Simultaneously, a small amount of gas may attempt to leak from the gap between the rotating measuring component 4 and the stationary component. The flow gap 105 between the sealing baffle 4014 and the inner casing 101 can be used to form a cooling barrier through the cooling medium to prevent leakage of high-temperature gas to the rear of the mounting plate and the drive mechanism area, protecting components such as the measuring drive mechanism 2 from high-temperature damage and improving the operational safety and durability of the device in harsh thermal environments. As a transitional sealing element between the rotating and stationary components, the sealing baffle 4014 not only prevents high-temperature gas from directly impacting the rotating measuring component 4 but also utilizes the cooling medium to continuously cool and protect itself, improving the thermal protection capability and operational reliability of the measuring device and extending the service life of the sealing baffle 4014.

[0057] In one embodiment, such as Figure 5 As shown, in the axial direction of the gas passage 104, the cooling jacket 103 corresponding to the downstream area of ​​the installation notch is separated by an annular baffle to form a coolant jacket 108. The coolant jacket 108 is divided into inner and outer layers by the annular baffle in the radial direction of the casing assembly 1. The layer closer to the gas passage 104 is the inlet jacket 1081, and the layer farther away from the gas passage 104 is the return jacket 1082. Multiple flow holes 109 are evenly distributed circumferentially on the annular baffle between the inlet jacket 1081 and the return jacket 1082. The flow holes 109 are through holes that penetrate the wall thickness of the annular baffle, and the diameter of the flow holes 109 is determined according to the coolant flow rate and pressure drop requirements. Coolant flows in from the inlet of the inlet jacket 1081, absorbs heat from the gas passage 104 during the flow process, and the temperature rises. The coolant flows into the return jacket 1082 through the flow hole 109 and finally flows out from the outlet of the return jacket 1082, forming a forced circulation path for the coolant.

[0058] By setting radially layered inlet jacket 1081 and return jacket 1082 in the cooling jacket 103, a forced circulation flow path for the coolant is formed. After the coolant directly absorbs the heat from the gas passage 104 in the inlet jacket 1081, it flows into the return jacket 1082 through the flow hole 109 and is discharged. This achieves orderly flow and efficient heat exchange of the coolant, avoids the problem of coolant stagnation and local overheating in the jacket, improves the cooling capacity and heat exchange efficiency of the cooling jacket 103, effectively protects the outer casing 102 and the measurement drive mechanism 2 from damage caused by high-temperature gas heat radiation, and improves the overall thermal protection performance of the measuring device.

[0059] In the radial layout of the coolant jacket 108, the inlet jacket 1081 is directly attached to the outer wall of the inner casing 101, separated from the gas passage 104 only by the wall thickness of the inner casing 101. The inner wall of the inlet jacket 1081 is the outer wall of the inner casing 101, and the radial thickness of the inlet jacket 1081 is determined according to the coolant flow rate and velocity requirements. The return jacket 1082 is located outside the inlet jacket 1081, that is, the inlet jacket 1081 is located between the return jacket 1082 and the gas passage 104. The outer wall of the return jacket 1082 is the inner wall of the outer casing 102, and the radial thickness of the return jacket 1082 is determined according to the coolant discharge requirements. The annular partition between the inlet jacket 1081 and the return jacket 1082 is fixedly connected to the inner casing 101 and the outer casing 102.

[0060] The coolant first enters the inlet jacket 1081 located near the gas passage 104, absorbing the heat transferred from the inner casing 101. The heated coolant then flows through the flow hole 109 connecting the inlet jacket 1081 and the return jacket 1082 to the return jacket 1082 located outside the inlet jacket 1081, and finally exits the coolant jacket 108 from the return jacket 1082, completing one cooling cycle. The inlet jacket 1081 is positioned on the side closest to the gas passage 104, allowing the coolant to absorb heat from the high-temperature gas exiting the combustion chamber test piece 5 immediately. The flow path of the coolant from the inlet jacket 1081 to the return jacket 1082 is consistent with the direction of heat transfer, which conforms to the basic principle of heat exchange and maximizes the utilization of the coolant's heat absorption capacity. At the same time, the return jacket 1082 is located on the outside, and its higher-temperature coolant has less thermal impact on the outer casing 102, improving the surface temperature uniformity and structural safety of the outer casing 102, reducing the impact of high temperature on the measurement drive mechanism 2, and improving cooling efficiency. It is particularly suitable for areas with extremely high heat loads, effectively controlling the wall temperature, and has a cooling capacity higher than that of air cooling.

[0061] In another embodiment, such as Figure 6 As shown, in the axial direction of the gas passage 104, the cooling jacket 103 corresponding to the downstream area of ​​the installation notch is separated by a partition plate to form an independent cold air jacket 106. The axial length of the cold air jacket 106 is determined according to the cooling requirements. The inner casing 101 has multiple radially penetrating air passages 107 evenly distributed circumferentially on the wall surface corresponding to the cold air jacket 106. The inlets of the air passages 107 communicate with the cold air jacket 106, and the outlets of the air passages 107 communicate with the gas passage 104. The diameter and number of the air passages 107 are determined according to the flow rate and pressure requirements of the cooling gas. The cooling gas in the cold air jacket 106 flows into the gas passage 104 through the air passages 107 under the action of the internal and external pressure difference.

[0062] Under pressure, cooling gas seeps into or is injected into the gas passage 104 through the vent 107 on the inner casing 101 wall, achieving directional cooling of the inner casing 101 wall downstream of the mounting notch. The cooling gas entering the gas passage 104 through the vent 107 forms a gas film on the high-temperature wall surface, isolating the high-temperature gas and reducing the wall temperature. This enhances the thermal protection of critical parts of the inner casing 101, preventing overheating, deformation, or ablation. By setting a cooling gas jacket 106 downstream of the installation gap, cooling gas can be concentrated and supplied to the measurement area. The air passage 107 directly introduces the cooling gas from the cooling gas jacket 106 into the gas passage 104. On the one hand, it provides directional convection cooling for high-temperature components such as the sensing part mounting plate 401, the measuring probe 402, and the sealing baffle 4014. On the other hand, it creates a positive pressure difference at the gap between the sealing baffle 4014 and the combustion chamber test piece 5, effectively preventing the leakage of high-temperature gas into the cooling jacket 103. This improves the sealing effect and cooling efficiency of the measuring device and ensures the normal operation of the rotating measuring component 4 in a high-temperature environment.

[0063] The sandwich-type miniature full-ring combustor component test and measurement device design provided in this application can meet the needs of miniature full-ring combustor component testing. It adopts a bushing-type casing structure, ensuring the installation and driving of the combustor outlet sensing component. This enables real-time and accurate testing of the full-ring surface performance parameters of the miniature combustor component outlet. The test and measurement device also features convenient assembly and disassembly and high operational reliability. Key features include: the driven shaft of the measurement drive mechanism 2 is designed with a large diameter structure, with the combustor test piece 5 encased in its center. The probe lead does not need to be led out from the center of the driven shaft, solving the problems of combustor component size limitations, the inability to design a suitable hollow driven shaft, and the difficulty of probe lead penetration. The combustor test piece 5 is located inside the test and measurement device. The test and measurement device casing mainly supports the combustor test piece 5 and the test piece measurement drive mechanism 2, and also forms a cooling air cavity. The partition between the test and measurement device and the combustor test piece 5 is filled with room temperature air, effectively protecting the test probe and probe mounting plate, and improving the reliability of the test and measurement device.

[0064] A sandwich-type micro combustion chamber outlet measuring device mainly consists of an inner casing 101, an outer casing 102, a measuring drive mechanism 2, a test probe, and a combustion chamber test piece 5. The cooling sandwich 103 is divided into an intake section, a transmission section, and an exhaust section along the flow direction of the cooling gas.

[0065] The intake section and the combustion chamber test piece 5 are connected by mounting edges. The front and rear mounting edges of the transmission section are connected to the intake section and the exhaust section, respectively, thus forming the entire combustion chamber test and measurement device. Reasonable centering methods, such as precision stops and precision positioning pins, are used between the mounting edges to ensure good coaxiality between the combustion chamber test piece 5 and the casing assembly 1. This ensures the accurate and reliable installation positions of the first bevel gear 301, the drive device of the measurement drive mechanism 2, the drive shaft 202 of the measurement drive mechanism 2, the second bevel gear 302, the driven mounting shaft 303, the sensing part mounting plate 401, the test probe, and other structures.

[0066] The driven mounting shaft 303 is divided into two parts: a stator 3031 and a rotor 3032. The stator 3031 is fixed to the inner wall of the outer casing 102 via a mounting edge, providing fixation and support for the entire driven mounting shaft 303. The rotor 3032 is located at the center of the stator 3031, and the two are rotated together through structures such as a bearing 3033 and a flexible mating ring 3034. The second bevel gear 302 is connected to the rotor 3032 via a mounting edge and other structures, and its positioning and support are mainly controlled by the rotor 3032. Through the above structure, the fixation, support, and rotation requirements of the second bevel gear 302 are ensured. Based on this, the drive device drives the drive shaft and the first bevel gear 301. Through the meshing and torque transmission of the first bevel gear 301 and the second bevel gear 302, the rotation requirements of the measuring drive mechanism 2 are achieved.

[0067] The sensing unit mounting plate 401 consists of a mounting plate body 4011, probe mounting slots 4012, a clamping cover plate 4013, and a sealing baffle plate 4014. The mounting plate body 4011 is connected to the second bevel gear 302. Multiple probe mounting slots 4012 are formed on the mounting plate body 4011. The mounting slots 4012 are generally wedge-shaped. The test probes are installed in the slots, forming a small clearance fit with the mounting slots 4012, and are pressed and fixed by the clamping cover plate 4013. This probe installation method not only facilitates the installation and removal of probes, but also ensures that the probes are stable and reliable when the measurement drive mechanism 2 is running.

[0068] During the test, a cooling air stream is introduced into the cooling jacket 103 of the micro combustion chamber outlet measuring device. This serves two main purposes: sealing and cooling. The sensing element mounting plate 401 is located between the combustion chamber test piece 5 outlet and the exhaust section inlet. To prevent high-temperature combustion gas from leaking through the gap between these three points and damaging the various test leads in the jacket, a sealing baffle 4014 structure is designed inside the sensing element mounting plate 401. The sealing baffle 4014 forms a small clearance fit with the combustion chamber test piece 5 outlet and the exhaust section inlet, and simultaneously works with the cooling air in the measuring device jacket to seal and prevent high-temperature gas leakage. Cooling. To prevent the high-temperature gas from burning the sealing baffle 4014 and test probes, which are exposed to high-temperature components in the combustion gas, a certain number and diameter of small air inlets are provided on both the sealing baffle 4014 and the test probes to provide cooling protection.

[0069] The exhaust section is located in a high-temperature area. To prevent the exhaust section from burning or deforming, it needs to be designed with cooling protection. There are usually two methods: the exhaust section is water-cooled, which is designed as a sandwich structure. Cooling water enters from the inner layer, enters the outer layer through small holes in the sandwich wall, and is discharged to achieve cooling protection of the exhaust section; or the exhaust section is air-cooled, which is designed with an air intake cavity inside. A certain number and size of cooling holes are opened on the inner wall of the exhaust section, so that the cold air forms a protective air film on the inner wall of the exhaust section.

[0070] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A miniature combustion chamber outlet measuring device, characterized in that, include: The casing assembly (1) includes an inner casing (101) and an outer casing (102) installed together. A cooling jacket (103) is reserved between the inner casing (101) and the outer casing (102). A gas passage (104) is axially formed on the inner side of the inner casing (101). An installation notch is provided on the inner casing (101). The combustion chamber test piece (5) is suitable for fixed installation at the installation notch. The measuring drive mechanism (2) is fixedly installed on the outer casing (102). The driving end of the measuring drive mechanism (2) is equipped with a rotating measuring component (4). The rotating measuring component (4) is installed at the mounting notch and is arranged facing the exhaust port of the combustion chamber test piece (5). An overflow gap (105) is reserved between the rotating measuring component (4) and the edge of the mounting notch.

2. The miniature combustion chamber outlet measuring device according to claim 1, characterized in that, The measuring drive mechanism is arranged perpendicular to the axis of the gas passage (104), and the drive end of the measuring drive mechanism (2) is installed in cooperation with the rotating measuring component (4) through the steering linkage component (3).

3. The miniature combustion chamber outlet measuring device according to claim 2, characterized in that, The steering linkage assembly (3) includes a first bevel gear (301) and a second bevel gear (302). The first bevel gear (301) is installed at the output end of the measuring drive mechanism (2), and the second bevel gear (302) is fixedly connected to the rotating measuring assembly (4). The first bevel gear (301) and the second bevel gear (302) mesh and drive each other. The first bevel gear (301) and the second bevel gear (302) are arranged perpendicular to each other.

4. The miniature combustion chamber outlet measuring device according to claim 3, characterized in that, The steering linkage assembly (3) further includes a driven mounting shaft (303), which is rotatably mounted on the inner side wall of the outer casing (102), and the second bevel gear (302) is fixedly mounted on the driven mounting shaft (303).

5. The miniature combustion chamber outlet measuring device according to any one of claims 1 to 4, characterized in that, The rotating measurement assembly (4) includes a sensing part mounting plate (401) and at least one measurement probe (402), the measurement probe (402) being detachably mounted on the sensing part mounting plate (401).

6. The miniature combustion chamber outlet measuring device according to claim 5, characterized in that, The sensing part mounting plate (401) has a mounting groove (4012) with the depth direction of the mounting groove (4012) arranged along the axial direction of the gas passage (104), and the measuring probe (402) is installed in the mounting groove (4012).

7. The miniature combustion chamber outlet measuring device according to claim 6, characterized in that, The sensor mounting plate (401) is an annular structure. A sealing baffle (4014) is fixedly installed on the inner ring of the sensor mounting plate (401). An exhaust gap is reserved between the sealing baffle (4014) and the combustion chamber test piece (5). A flow gap (105) is reserved between the sealing baffle (4014) and the inner casing (101).

8. The miniature combustion chamber outlet measuring device according to any one of claims 1 to 4, characterized in that, A cold air jacket (106) is provided in the cooling jacket (103) downstream of the installation notch, and an air passage (107) is provided on the inner casing (101), which connects the cold air jacket (106) to the gas passage (104).

9. The miniature combustion chamber outlet measuring device according to any one of claims 1 to 4, characterized in that, A coolant jacket (108) is provided in the cooling jacket (103) downstream of the installation notch. The coolant jacket (108) includes an inlet jacket (1081) and a return jacket (1082) along the radial direction of the casing assembly (1). An overflow hole (109) is provided between the inlet jacket (1081) and the return jacket (1082).

10. The miniature combustion chamber outlet measuring device according to claim 9, characterized in that, The liquid inlet jacket (1081) is arranged close to the gas passage (104), and the return jacket (1082) is located on the side of the liquid inlet jacket (1081) away from the gas passage (104).

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