Device and method for measuring and positioning spray cone angle of fuel nozzle

Abstract

The invention belongs to the technical field of aero-engine fuel nozzle flow tests, and relates to a fuel nozzle spray cone angle measuring and positioning device and method.The spray cone angle measuring and positioning device is of a circular truncated cone structure, a step inner hole is machined in the center of the device, and a conical hole with a conical surface is machined in the bottom of the step inner hole; the spray angle test positioning device comprises a large outer cylinder and a small outer cylinder, and the small outer cylinder is located at the bottom of the large outer cylinder; the small outer cylinder is matched with a tester positioning hole; and the step inner hole is matched with the outer circle of the nozzle of the fuel nozzle. The spray angle measuring and positioning device effectively avoids the problems of high cost, long period and inaccurate positioning caused by manufacturing a special complex positioning device, improves the test efficiency and accuracy of the spray cone angle of the fuel nozzle, and greatly solves the problems of high manufacturing cost and unreliable positioning.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation engine fuel nozzle flow rate testing, and relates to a fuel nozzle spray cone angle measurement and positioning device and method. Background Art

[0002] Fuel nozzles are core components of aircraft engine combustion chambers. Their spray quality, spray angle, and flow rate directly impact the overall engine's start-up time and efficiency. Fuel nozzle performance tests include flow rate testing, spray cone angle testing, and fuel distribution unevenness testing. Currently, spray cone angle is typically measured using a manual probe method. This involves two pointers positioned adjacent to the spray cone, each designed to penetrate the spray cone. When the pointers intersect the conical spray surface, the distance the probes penetrate is used to calculate the spray cone angle using trigonometric calculations.

[0003] The spray cone angle test requires that the spray cone angle be measured on two mutually perpendicular planes at an axial position of Lmm from the nozzle end face. The angle at which the center line of the spray cone angle deviates from the nozzle axis , angle measurement uses a stylus type measuring device, such as Figure 1 When measuring the spray cone angle, the positional tolerance between the nozzle centerline and the zero-degree line of the spray angle measurement pointer should be within Φ0.3mm, and the positioning deviation of the nozzle head end face should be within ±0.15mm.

[0004] In order to ensure the measurement of spray cone angle, it is necessary to design and manufacture a special installation and positioning fixture for testing. When installing the nozzle, the traditional method is to locate the nozzle installation end face and the installation hole. The installation and positioning device structure is as follows: Figure 2 This installation and positioning device has the following disadvantages: the fixture structure is complex, the manufacturing cost is high, and the positioning accuracy is low due to the large dimensional tolerance of the distance between the nozzle installation position and the nozzle outlet position. Summary of the Invention

[0005] In response to the problems existing in the prior art, the present invention provides a fuel nozzle spray cone angle measurement and positioning device and method, which effectively avoids the high cost, long cycle and inaccurate positioning problems caused by manufacturing dedicated complex positioning devices, improves the test efficiency and accuracy of the fuel nozzle spray cone angle, and greatly solves the problems of high manufacturing cost and unreliable positioning.

[0006] The present invention is achieved through the following technical solutions: A fuel nozzle spray cone angle test positioning device, the spray cone angle test positioning device is a frustum-shaped structure, the center portion of which is processed with a stepped inner hole, and the bottom of the stepped inner hole is processed into a tapered hole with a tapered surface; The spray cone angle test positioning device comprises a large outer cylinder and a small outer cylinder, wherein the small outer cylinder is located at the bottom of the large outer cylinder; the small outer cylinder is matched with the positioning hole of the tester; and the inner hole of the step is matched with the outer circle of the fuel nozzle nozzle.

[0007] Preferably, the diameter of the large outer circle of the spray cone angle test positioning device is D1, the diameter of the small outer circle is D2, the height of the small outer circle is L3, and D1 is greater than D2.

[0008] Preferably, the taper size of the outer conical surface of the tapered hole is α, the depth of the tapered hole is L1; and the diameter of the tapered hole is D5.

[0009] Preferably, the taper dimension α is 80-90°.

[0010] Preferably, the diameter of the lower end of the step inner hole is D4, and the diameter of the lower end is D3. The total height of the spray cone angle test positioning device is L4, the length of the tapered hole is L2, and the depth of the step inner hole is (L4-L2); Preferably, the angle test positioning device ensures that the end face of the fuel nozzle nozzle fits with the end face of the inner hole by controlling the height dimension L4 and the depth of the inner hole (L4-L2), so that the distance between the nozzle and the measuring probe is the set value L.

[0011] Preferably, the set value L satisfies the relationship: L=H-L0 Where H is the distance from the large end face of the tester to the measuring probe, and L0 is the distance from the large end face of the tester to the end face of the middle hole of the positioning device.

[0012] Preferably, the distance between the nozzle and the measuring probe is set to a value L of 8-10 mm.

[0013] Preferably, the angular test positioning device is a disc-shaped rotating metal structure with steps.

[0014] A method for measuring the spray cone angle of a fuel nozzle, using the cone angle test positioning device, comprises the following steps: Assemble the cone angle test positioning device in the positioning hole of the tester; Install the fuel nozzle in the positioning device so that the outer circle of the nozzle fits with the inner hole of the step and the end face fits with the bottom surface of the inner hole; The spray cone angle is measured by adjusting the height and hole depth of the cone angle test positioning device and controlling the distance between the nozzle and the measuring probe.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides a fuel nozzle spray cone angle test positioning device with a simple structure and reliable positioning. By controlling the height and hole depth of the positioning device, the distance between the fuel nozzle nozzle and the measuring probe is directly guaranteed, thereby avoiding the high cost and long cycle problems caused by manufacturing a dedicated complex positioning device, and improving the efficiency of the fuel nozzle spray cone angle test. The positioning device has a simple structure, low manufacturing cost, short cycle, and reliable positioning; it can accurately locate the nozzle position and measure the fuel spray cone angle.

[0016] The positioning device of the present invention has a simple and reliable structure. By cooperating with the positioning hole of the tester through the outer circle and the end surface, the nozzle is accurately positioned. This overcomes the problem of low positioning accuracy caused by the large dimensional tolerance of the distance between the nozzle installation position and the nozzle nozzle position in traditional positioning devices, thereby improving the accuracy of spray cone angle measurement. When the positioning device of the present invention is assembled on a tester, the distance between the nozzle orifice end face and the stylus can be precisely adjusted by controlling the size of each stepped hole of the positioning device. This effectively solves the problem in the prior art of changes in the spray cone angle caused by the passive lifting or rotation of the fuel nozzle, thereby ensuring the reliability of the measurement results. The positioning device of the present invention has a reasonable structural design. By providing a bottom structure of the tapered hole, it can effectively guide the alignment of the fuel nozzle nozzle and the measurement probe, thereby improving the operational convenience and measurement accuracy during the measurement process. The positioning device of the present invention is suitable for flow rate tests of various types of fuel nozzle spray cone angles, has strong versatility and practicality, and can significantly improve the efficiency and accuracy of fuel nozzle spray cone angle measurement.

[0017] Tests have proven that one embodiment of the present invention effectively avoids the high cost, long production cycles, and inaccurate positioning associated with manufacturing complex, specialized positioning devices. This improves the efficiency and accuracy of fuel nozzle spray cone angle testing, significantly resolving the issues of high manufacturing costs and unreliable positioning. This test solution has been applied to flow rate testing of various fuel nozzle spray cone angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic diagram of the spray cone angle stylus measurement requirements. α=2tg -1 (X / H) ; X is the reading of the touch rod position during measurement; H is the distance between the nozzle end face and the probe; Figure 2 A diagram of a positioning device used in the prior art; Figure 3 A structural diagram of the fuel nozzle that needs to be measured in the present invention; Figure 4 A fuel nozzle flow rate test positioning device of the present invention; Figure 5 This is a schematic diagram of the installation of the positioning device, tester, and fuel nozzle of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] The invention aims to provide a nozzle spray cone angle test positioning device which is simple, reliable and has high positioning accuracy.

[0022] The spray cone angle test positioning device is a frustum-shaped structure with a stepped inner hole in the center and a tapered hole with a tapered surface at the bottom. The spray cone angle test positioning device comprises a large outer circle and a small outer circle, wherein the small outer circle is located at the bottom of the large outer circle; the small outer circle is matched with the positioning hole of the tester; The inner hole of the center step includes an inner hole and a bottom hole. The inner hole is located at the large outer circle, the bottom hole is located at the small outer circle, and the tapered hole is located at the bottom of the small outer circle. The inner hole matches the outer circle of the fuel nozzle nozzle.

[0023] The typical nozzle structure measured by the fuel nozzle spray cone angle measurement and positioning device is as follows Figure 3 As shown, the nozzle head size is D4, and the distance from the nozzle mounting hole to the nozzle end face is L±0.5. Before the implementation of the present invention, the positioning device is installed to position the nozzle mounting hole, and the positioning tolerance is large. To solve this problem, a new structure flow test positioning device is designed, such as Figure 4 and Figure 5As shown, its structural appearance is a disc-shaped rotating metal structural part with a step, which is processed with a stepped inner hole [A1] and a metal structural device with a tapered hole with a tapered surface at the bottom. The positioning device is installed in the positioning hole of the tester during use, and the outer circle and end face of the positioning device match the positioning hole of the tester. The positioning device of the present invention has a simple and reliable structure. By matching the outer circle and end face with the positioning hole of the tester, the precise positioning of the nozzle is achieved, overcoming the problem of low positioning accuracy of traditional positioning devices due to the large dimensional tolerance of the distance from the nozzle installation position to the nozzle nozzle position, thereby improving the accuracy of spray cone angle measurement; The distance L between the nozzle orifice end face and the measuring needle is ensured by controlling the size of each step hole of the positioning device.

[0024] The specific size conversion formula is: L is equal to the distance from the upper end face of the tester to the stylus minus the distance from the lower end face of the positioning device mounting plate to the bottom of the middle hole, the expression is: H-L0=L; The purpose of the invention is achieved through the following technical solution: the large outer circle of the positioning device is D1, the total height is L4, the small outer circle of the step is D2 and matches the positioning hole of the tester, and the height of the small outer circle of the step is L3[A2]; (it can be one step hole or two, and if there are two, there is D3) The spray angle positioning device features a central stepped inner hole with a tapered hole at the bottom, measuring D5 in diameter, L1 in thickness, and L2 in length. The outer surface of the tapered hole has a tapered surface with a taper dimension of α. The inner hole, with a diameter of D4, matches the outer diameter of the fuel nozzle orifice. The hole depth is L4-L2[A3]. During nozzle assembly, the nozzle orifice end face aligns with the end face of the D4 diameter hole. By controlling the L1 dimension and the hole depth, the nozzle orifice distance from the measuring needle is maintained at Lmm. When the positioning device is assembled on the tester, the outer diameter and end face of the positioning device align with the tester's positioning hole. The distance from the tester's large end face to the probe is H, and the distance from the end face of the positioning device's central hole is L0. When the dimension H-L0=L, the distance from the fuel nozzle orifice to the measuring needle is fully measured.

[0025] The present invention uses a positioning device with a simple structure and low manufacturing cost. By controlling the height and hole depth of the positioning device, the distance between the fuel nozzle nozzle and the measuring probe is directly guaranteed. This avoids the high cost and long production cycle associated with manufacturing a dedicated and complex positioning device, and improves the efficiency of the fuel nozzle spray cone angle test. When the positioning device of the present invention is assembled on a tester, the distance between the nozzle orifice end face and the stylus can be accurately guaranteed by controlling the size of each stepped hole of the positioning device. This effectively solves the problem in the prior art of changes in the spray cone angle caused by the passive lifting or rotation of the fuel nozzle, thereby ensuring the reliability of the measurement results. The bottom structure of the tapered hole can effectively guide the alignment of the fuel nozzle nozzle and the measurement probe, improving the convenience of operation and measurement accuracy during the measurement process; Example 1 In order to test the spray cone angle of a certain type of aircraft engine fuel nozzle, it is necessary to design and manufacture a test positioning device. During the test, the test positioning device is first assembled in the positioning hole of the tester, and the fuel nozzle is assembled in the test positioning device. The outer circle of the fuel nozzle nozzle matches the inner hole of the positioning device, and the end face matches the bottom surface of the inner hole.

[0026] The positioning device body is a disc-shaped rotating metal structure part with steps, made of stainless steel, with a large outer diameter of Φ55mm and a total height of 18mm. The small outer diameter of the step is 38mm and the height is 13mm, which matches the positioning hole of the tester.

[0027] The positioning device is processed with a central step inner hole, the diameter of the step inner hole is 16mm, which matches the outer circle of the fuel nozzle nozzle, and the depth of the step inner hole is 16mm.

[0028] The bottom is machined into a tapered hole with a diameter of 10 mm and a thickness of 1 mm, and a tapered surface with a taper size of 90°.

[0029] During nozzle assembly, the nozzle orifice end face aligns with the end face of a small 38mm diameter outer diameter. By controlling the positioning device's height of 18mm and the stepped inner hole's depth of 16mm, the nozzle orifice distance from the measuring needle is maintained at 10mm. When the positioning device is assembled on the tester, the outer diameter and end face of the positioning device mate with the tester's positioning hole. The distance from the tester's large end face to the probe is 21mm, and from the end face of the positioning device's central hole is 11mm. A value of 21-11 = 10 indicates the full fuel nozzle nozzle-to-probe distance.

[0030] The specific working process is: assemble the test positioning device in the positioning hole of the tester, assemble the fuel nozzle in the test positioning device, the outer circle of the fuel nozzle nozzle matches the inner hole of the positioning device, and the end face matches the bottom surface of the inner hole to ensure that the distance between the nozzle end face and the tester measuring probe is 10mm, which can accurately measure the spray angle of the fuel nozzle.

[0031] The present invention provides a fuel nozzle spray cone angle test positioning device with a simple structure and reliable positioning. The positioning device has a simple structure, low manufacturing cost, short cycle time, and reliable positioning. It can accurately locate the nozzle position and measure the fuel spray cone angle. One embodiment of the present invention has been proven through experiments to effectively avoid the high cost, long cycle time, and inaccurate positioning problems associated with manufacturing dedicated complex positioning devices, improve the efficiency and accuracy of fuel nozzle spray cone angle testing, and significantly resolve the problems of high manufacturing cost and unreliable positioning. This test scheme has been applied to flow rate testing of multiple types of fuel nozzle spray cone angles.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. When a component is referred to as being "fixed to" another component, it can be directly on the other component or there can also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there can be an intermediate component at the same time. When a component is considered to be "set on" another component, it can be directly set on the other component or there can be an intermediate component at the same time.

[0035] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0036] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in this industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with this profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. A fuel nozzle spray cone angle test positioning device, characterized in that: The spray cone angle test positioning device is a truncated cone structure, the center of which is processed with a stepped inner hole, and the bottom of the stepped inner hole is processed into a tapered hole with a tapered surface; The spray cone angle test positioning device comprises a large outer cylinder and a small outer cylinder, wherein the small outer cylinder is located at the bottom of the large outer cylinder; the small outer cylinder is matched with the positioning hole of the tester; and the inner hole of the step is matched with the outer circle of the fuel nozzle nozzle.

2. A fuel nozzle spray cone angle test positioning device according to claim 1, characterized in that: The diameter of the large outer cylinder of the spray cone angle test positioning device is D1, the diameter of the small outer cylinder is D2, the height of the small outer cylinder is L3, and the diameter D1 of the large outer cylinder is greater than the diameter D2 of the small outer cylinder.

3. The fuel nozzle spray cone angle test positioning device according to claim 1, characterized in that: The taper dimension of the outer tapered surface of the tapered hole is α.

4. A fuel nozzle spray cone angle test positioning device according to claim 3, characterized in that: The taper dimension α is 80-90°.

5. A fuel nozzle spray cone angle test positioning device according to claim 3, characterized in that: The diameter of the upper end of the step inner hole is D4, and the diameter of the lower end is D3; the total height of the spray cone angle test positioning device is L4, the length of the tapered hole is L2, and the depth of the step inner hole is (L4-L2).

6. A fuel nozzle spray cone angle test positioning device according to claim 5, characterized in that: The spray cone angle test positioning device ensures that the end face of the fuel nozzle nozzle fits the end face of the inner hole by controlling the height dimension L4 of the spray cone angle test positioning device and the depth (L4-L2) of the step inner hole, so that the distance between the nozzle and the measuring probe is the set value L.

7. A fuel nozzle spray cone angle test positioning device according to claim 6, characterized in that: The set value L satisfies the relationship: L=H-L0 Where H is the distance from the large end face of the tester to the measuring probe, and L0 is the distance from the large end face of the tester to the end face of the middle hole of the positioning device.

8. The fuel nozzle spray cone angle test positioning device according to claim 7, characterized in that: The distance between the nozzle and the measuring probe is set to a value L of 8-10 mm.

9. The fuel nozzle spray cone angle test positioning device according to claim 1, characterized in that: The spray cone angle test positioning device is a disc-shaped rotating metal structure with steps.

10. A method for measuring the spray cone angle of a fuel nozzle, using the cone angle test positioning device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Assemble the cone angle test positioning device in the positioning hole of the tester; Install the fuel nozzle in the positioning device so that the outer circle of the nozzle fits with the inner hole of the step and the end face fits with the bottom surface of the inner hole; The spray cone angle is measured by adjusting the height and hole depth of the cone angle test positioning device and controlling the distance between the nozzle and the measuring probe.

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