Method and device for testing ignition voltage of ignition electric nozzle of aero-engine

Abstract

The invention relates to the technical field of ignition electric nozzle tests, and discloses a method and device for testing the ignition voltage of an ignition electric nozzle of an aero-engine, and the method comprises the steps: enabling fuel oil to drop on the discharge end of the ignition electric nozzle to be tested in a drop manner; and the minimum ignition voltage of the measured ignition electric nozzle is obtained by increasing the ignition voltage step by step. Through oil dripping ignition voltage testing, the extreme condition that fuel oil in an engine combustion chamber is condensed into oil drops and drips and overfills the discharge end of the ignition electric nozzle is simulated, the actual ignition voltage when the ignition electric nozzle is assembled on an engine is tested, and the testing result is more accurate and higher in feasibility compared with the ignition voltage testing of the ignition electric nozzle of an aero-engine in the prior art; by arranging the mounting base, the clamping assembly, the supporting assembly and the oil dripping assembly, ignition electric nozzles of different specifications and ignition electric nozzles under different working conditions can be tested, and the application range is wide; meanwhile, an ignition electric nozzle experiment scene is stabilized, and the reliability of test data is improved.

Description

Technical Field

[0001] The invention relates to the technical field of ignition nozzle testing, in particular to a method and a device for testing the ignition voltage of an ignition nozzle of an aircraft engine. Background Art

[0002] The ignition nozzle is installed in the engine combustion chamber, and converts the transmitted high-voltage electrical pulse into an electric spark to ignite the fuel in the combustion chamber. If the ignition nozzle ignition voltage is too high or too low, it will cause the ignition nozzle to fail to ignite, thus causing the engine to fail to start. Therefore, the minimum ignition voltage of the ignition nozzle is an important indicator of the ignition nozzle, and it must be tested.

[0003] Conventional ignition nozzle ignition voltage test only tests the ignition voltage in the laboratory environment, while the fuel in the combustion chamber is normally in an atomized state, and in extreme cases it will condense into oil droplets. Therefore, there is a big difference between the test environment in the laboratory and the actual environment in the engine combustion chamber. This may cause the ignition voltage tested to be inconsistent with the actual working ignition voltage, resulting in ignition failure when the ignition nozzle is actually used. Summary of the invention

[0004] The purpose of the present invention is to provide a method and device for testing the ignition voltage of an aircraft engine ignition nozzle, so as to solve the problem that the ignition data tested by the existing test method is inconsistent with the ignition data required by the actual environment of the engine combustion chamber.

[0005] The present invention is realized by the following technical scheme: a method for testing the ignition voltage of an aircraft engine ignition nozzle, wherein the fuel is dripped on the discharge end of the ignition nozzle to be tested in units of drops; the minimum ignition voltage of the ignition nozzle to be tested is obtained by increasing the ignition voltage step by step; the initial voltage is V i , the ignition voltage is V i+n , the V i+n =V i +N*V step , where V step is the step size, and N is the number of times the voltage is increased.

[0006] In order to better implement the present invention, further, the specific steps of the test are: Step S1, before dripping the fuel, the ignition nozzle to be tested needs to be mounted on the fuel dripping device through a fixture; Step S2, connecting the ignition nozzle to be tested to a power supply with adjustable voltage; Step S3, operating the oil dripping device to make the fuel drip onto the discharge end of the ignition nozzle to be tested; Step S4: Set the power supply output initial voltage V i , supply power to the ignition nozzle under test and observe whether the ignition is successful; Step S5: Increase the power supply output voltage to V i+1 , observe whether the ignition is successful; Step S6, repeat step S5 until the ignition nozzle under test is observed to be ignited successfully, at which point the voltage V i+n That is the ignition voltage.

[0007] In order to better implement the present invention, further, in the step S3, before the oil is officially dripped onto the discharge end of the ignition nozzle to be tested, the oil dripping speed and the oil dripping diameter are adjusted according to the experimental conditions.

[0008] A device for testing the ignition voltage of an aircraft engine ignition nozzle comprises a mounting seat, a sliding rod, an oil dripping assembly, a clamping assembly and a plurality of supporting assemblies. The oil dripping assembly comprises an oil cup and an oil dripping nozzle connected thereto. The sliding rod is mounted on the mounting seat, and the supporting assembly is movably connected to the sliding rod. The top supporting assembly is used for placing the oil dripping assembly, the middle supporting assembly is used for controlling the oil dripping nozzle, and the bottom supporting assembly is used for placing the clamping assembly.

[0009] In order to better realize the present invention, further, the support assembly includes a fixing screw, a sleeve, a support plate, and a connecting plate. The fixing screw is threadedly connected to the sleeve, the sleeve is slidably connected to the sliding rod, and the connecting plate is fixedly connected to the sleeve through the support plate; the connecting plate in the top support assembly is support plate B, the connecting plate in the middle support assembly is support plate A, and the connecting plate in the bottom support assembly is a fixed plate; the oil cup is installed on the support plate B, the oil drip nozzle is installed on the support plate A, and the clamping assembly is installed on the fixed plate.

[0010] In order to better realize the present invention, further, the oil drip assembly also includes a connector A, an electric regulating valve, and a connector B. The oil cup includes a cover and a cup body. The cup body and the electric regulating valve are connected through the connector A. The oil drip nozzle and the electric regulating valve are connected through the connector B.

[0011] In order to better realize the present invention, further, the clamping assembly includes a product clamp, a pin, a movable bolt, a knurled nut, a retaining ring, and a sealing rubber ring. A sealing rubber ring is installed at the bottom of the product clamp, and multiple pins are installed on the wall of the product clamp. The retaining ring is inserted from the bottom of the product clamp; multiple movable bolts are slidably connected on the fixed plate, and a knurled nut is threadedly connected on the movable bolt.

[0012] In order to better realize the present invention, further, the mounting seat includes a base, a nut, a spring washer, a flat washer, and a hexagonal bolt. The sliding rod is installed on the base, and a plurality of hexagonal bolts are installed on the base. The fixing plate is provided with a flat washer and a spring washer, and the nut is threadedly connected to the hexagonal bolt.

[0013] Compared with the prior art, the present invention has the following advantages and beneficial effects: (1) The present invention uses the oil dripping ignition voltage test to simulate the extreme situation that the fuel in the engine combustion chamber condenses into oil droplets, drips and soaks the discharge end of the ignition nozzle, so as to simulate the engine combustion chamber environment to the greatest extent, and test the actual ignition voltage of the ignition nozzle when it is assembled on the engine. The test result is more accurate and reliable than the previous aircraft engine nozzle ignition voltage test; (2) The present invention adopts a step-by-step method to increase the ignition voltage, thereby avoiding applying an excessively high voltage to the ignition nozzle and reducing the risk of damage; (3) The present invention can test ignition nozzles of different specifications and ignition nozzles under different working conditions by providing a mounting seat, a clamping assembly, a supporting assembly, and an oil dripping assembly, and has a wide range of applications. At the same time, the ignition nozzle experimental scene is stabilized to improve the reliability of the test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the test method flow chart.

[0015] Figure 2 This is a schematic diagram of the overall structure of the test device.

[0016] Figure 3 Schematic diagram of the mounting base structure.

[0017] Among them: 101-base; 102-slide rod; 103-fixing screw; 104-fixing plate; 105-sleeve; 106-support plate A; 107-support plate; 108-support plate B; 109-cover; 110-cup body; 111-connector A; 112-electric regulating valve; 113-connector B; 114-drip nozzle; 115-product fixture; 116-pin; 117-movable bolt; 118-knurled nut; 119-clamp ring; 120-sealing rubber ring; 121-nut; 122-spring washer; 123-flat washer; 124-hexagonal bolt. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] Embodiment 1: This embodiment provides a method for testing the ignition voltage of an aircraft engine ignition nozzle. Figure 1 As shown, the fuel is dripped onto the discharge end of the ignition nozzle under test in units of drops; the minimum ignition voltage of the ignition nozzle under test is obtained by increasing the ignition voltage step by step.

[0021] The initial voltage is V i , the ignition voltage is V i+n , the V i+n =V i +N*V step , where V step is the step size, that is, the voltage increase each time, and N is the number of times the voltage is increased.

[0022] The oil dripping ignition voltage test simulates the extreme situation of the fuel in the engine combustion chamber condensing into oil droplets. At this time, the fuel drips and soaks the discharge end of the ignition nozzle, and the ignition voltage of the ignition nozzle is tested. The extreme environment of the engine combustion chamber is simulated to the greatest extent, and the actual ignition voltage of the ignition nozzle used in the engine is tested. The test results are more accurate and reliable than the previous aviation engine nozzle ignition voltage test. At the same time, the step-by-step increase in ignition voltage can avoid applying too high a voltage to the ignition nozzle and reduce the risk of damage.

[0023] Embodiment 2: This embodiment further expands the test steps based on embodiment 1, specifically as follows Figure 1 As shown, the specific steps of the test are: Step S1, before dripping the fuel, the ignition nozzle to be tested needs to be mounted on the fuel dripping device through a fixture; Step S2, connecting the ignition nozzle to be tested to a power supply with adjustable voltage; Step S3, operating the oil dripping device to make the fuel drip onto the discharge end of the ignition nozzle to be tested; Step S4: Set the power supply output initial voltage V i , supply power to the ignition nozzle under test and observe whether the ignition is successful; Step S5: Increase the power supply output voltage to V i+1, observe whether the ignition is successful; Step S6, repeat step S5 until the ignition nozzle under test is observed to be ignited successfully, at which point the voltage V i+n That is the ignition voltage.

[0024] The purpose of using the fixture is to place the ignition nozzle stably. The ignition nozzle will shake during the experiment, which will affect the experimental data. The oil dripping device can make the fuel drip evenly, which is also to improve the reliability of the experimental data.

[0025] The other parts of this embodiment are the same as those of the above embodiment and will not be described in detail.

[0026] Embodiment 3: This embodiment further expands the test steps based on Embodiment 2. Figure 1 As shown, in step S3, before the oil is officially dripped onto the discharge end of the ignition nozzle to be tested, the oil dripping speed and oil dripping diameter are adjusted according to the experimental conditions. The oil dripping speed is 10 drops to 100 drops / min; the oil droplet diameter is Φ2mm to Φ5mm.

[0027] Before the experiment, the debugging preparation work is carried out according to the experimental conditions, so as to test the different ignition voltages of the ignition nozzle under different specifications of injection amount and different injection speed conditions, so as to make the test range wider.

[0028] The other parts of this embodiment are the same as those of the above embodiment and will not be described in detail.

[0029] Embodiment 4: This embodiment provides a device for testing the ignition voltage of an aircraft engine ignition nozzle, specifically, Figure 2 , Figure 3 As shown, it includes a mounting seat, a slide rod 102, an oil dripping assembly, a clamping assembly and a plurality of supporting assemblies. The oil dripping assembly includes an oil cup and an oil dripping nozzle 114 connected thereto.

[0030] The slide bar 102 is mounted on the mounting seat, and the support assembly is movably connected to the slide bar 102. The top support assembly is used to place the oil drip assembly, the middle support assembly is used to control the oil drip nozzle 114, and the bottom support assembly is used to place the clamping assembly.

[0031] Before conducting the oil drip ignition voltage test, first adjust the spacing between the supporting components on the slide bar 102 according to the specifications of the ignition nozzle, then use the clamping component to fix the ignition nozzle, and then start the oil drip assembly so that the oil drip nozzle 114 drips fuel on the discharge end of the ignition nozzle at a uniform speed to start the test.

[0032] The other parts of this embodiment are the same as those of the above embodiment and will not be described in detail.

[0033] Embodiment 5: This embodiment further expands the support assembly based on the embodiment 4. Figure 2 As shown, the support assembly includes a fixing screw 103, a sleeve 105, a support plate 107, and a connecting plate. The fixing screw 103 is threadedly connected to the sleeve 105, the sleeve 105 is slidably connected to the slide rod 102, and the connecting plate is fixedly connected to the sleeve 105 through the support plate 107; the connecting plate in the top support assembly is the support plate B108, the connecting plate in the middle support assembly is the support plate A106, and the connecting plate in the bottom support assembly is the fixed plate 104; the oil cup is installed on the support plate B108, the oil drip nozzle 114 is installed on the support plate A106, and the clamping assembly is installed on the fixed plate 104.

[0034] When adjusting the position of the support assembly, first loosen the fixing screw 103, then manually move the sliding sleeve 105 to slide on the sliding rod 102, and after the position is adjusted, tighten the fixing screw 103, and then the position of the sliding sleeve 105 is fixed; the adjustment is convenient and the operation is simple.

[0035] The other parts of this embodiment are the same as those of the above embodiment and will not be described in detail.

[0036] Embodiment 6: This embodiment further expands the oil dripping component on the basis of embodiment 5, specifically as follows Figure 2 As shown, the oil drip assembly also includes a connector A111, an electric regulating valve 112, and a connector B113. The oil cup includes a cover 109 and a cup body 110. The cup body 110 is connected to the electric regulating valve 112 via the connector A111, and the oil drip nozzle 114 is connected to the electric regulating valve 112 via the connector B113.

[0037] The opening and cross-sectional area of ​​the electric regulating valve 112 are controlled by accessing the electrical interface and the program, so as to achieve the purpose of regulating the flow of the electric regulating valve 112 .

[0038] The other parts of this embodiment are the same as those of the above embodiment and will not be described in detail.

[0039] Embodiment 7: This embodiment further expands the clamping assembly based on Embodiment 5. Figure 2 As shown, the clamping assembly includes a product clamp 115, a pin 116, a movable bolt 117, a knurled nut 118, a retaining ring 119, and a sealing rubber ring 120. A sealing rubber ring 120 is installed at the bottom of the product clamp 115, and multiple pins 116 are installed on the wall of the product clamp 115. The retaining ring 119 is inserted from the bottom of the product clamp 115; multiple movable bolts 117 are installed and slidably connected on the fixed plate 104, and the movable bolts 117 are threadedly connected with knurled nuts 118.

[0040] When installing the ignition nozzle, first rotate the knurled nut 118 to make the movable bolt 117 move radially along the fixed plate 104, and then place the retaining ring 119 flat on the multiple movable bolts 117, and then insert the product fixture 115 equipped with the pin 116 into the center of the retaining ring 119. Due to the limiting effect of the pin 116 and the movable bolt 117 on the retaining ring 119, the product fixture 115 is stably supported and the ignition nozzle is installed in the product fixture 115; the oil droplets dripping during the experiment are collected by the product fixture 115 to prevent the oil from contaminating the work surface.

[0041] The other parts of this embodiment are the same as those of the above embodiment and will not be described in detail.

[0042] Embodiment 8: This embodiment further expands the mounting base on the basis of Embodiment 4. Figure 3 As shown, the mounting base includes a base 101, a nut 121, a spring washer 122, a flat washer 123, and a hexagonal bolt 124. The sliding rod 102 is installed on the base 101. A plurality of hexagonal bolts 124 are installed on the base 101. The fixing plate 104 is sleeved with a flat washer 123 and a spring washer 122. The nut 121 is threadedly connected to the hexagonal bolt 124.

[0043] When installing the device, first unscrew the nut 121, and then pass the hexagonal bolt 124 through the work surface. At this time, the spring washer 122 between the work surface and the base 101 begins to be compressed, and then the nut 121 is screwed on the hexagonal bolt 124. By tightening different flat washers 123 to different degrees, the inclination angle of the base 101 is adjusted, that is, the product fixture 115 is adjusted to be coaxial and vertical with the oil drip nozzle 114. Prevent the deviation of the oil dripping position at the oil drip nozzle 114 caused by the uneven work surface.

[0044] The other parts of this embodiment are the same as those of the above embodiment and will not be described in detail.

[0045] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A method for testing the ignition voltage of an aircraft engine ignition nozzle, characterized in that: The fuel is dripped onto the discharge end of the ignition nozzle under test in units of drops; the minimum ignition voltage of the ignition nozzle under test is obtained by increasing the ignition voltage step by step; The initial voltage is V i , the ignition voltage is V i+n , the V i+n =V i +N*V step , where V step is the step size, and N is the number of times the voltage is increased.

2. A method for testing the ignition voltage of an aircraft engine ignition nozzle according to claim 1, characterized in that: The specific steps of the test are: Step S1, before dripping the fuel, the ignition nozzle to be tested needs to be mounted on the fuel dripping device through a fixture; Step S2, connecting the ignition nozzle to be tested to a power supply with adjustable voltage; Step S3, operating the oil dripping device to make the fuel drip onto the discharge end of the ignition nozzle under test; Step S4: Set the power supply output initial voltage V i , supply power to the ignition nozzle under test and observe whether the ignition is successful; Step S5: Increase the power supply output voltage to V i+1 , observe whether the ignition is successful; Step S6, repeat step S5 until the ignition nozzle under test is observed to be ignited successfully, at which point the voltage V i+n That is the ignition voltage.

3. A method for testing the ignition voltage of an aircraft engine ignition nozzle according to claim 2, characterized in that: In step S3, before the oil is officially dripped onto the discharge end of the ignition nozzle to be tested, the oil dripping speed and the oil dripping diameter are adjusted according to the experimental conditions.

4. A device for testing the ignition voltage of an aircraft engine ignition nozzle, used in the test method according to any one of claims 1 to 3, characterized in that: It comprises a mounting seat, a sliding rod (102), an oil dripping assembly, a clamping assembly and a plurality of supporting assemblies, wherein the oil dripping assembly comprises an oil cup and an oil dripping nozzle (114) connected thereto; The slide bar (102) is mounted on a mounting seat, the support assembly is movably connected to the slide bar (102), the top support assembly is used to place the oil drip assembly, the middle support assembly is used to control the oil drip nozzle (114), and the bottom support assembly is used to place the clamping assembly.

5. The device for testing the ignition voltage of an aircraft engine ignition nozzle according to claim 4, characterized in that: The support assembly comprises a fixing screw (103), a sliding sleeve (105), a support plate (107), and a connecting plate; the fixing screw (103) is threadedly connected to the sliding sleeve (105); the sliding sleeve (105) is slidably connected to the sliding rod (102); and the connecting plate is fixedly connected to the sliding sleeve (105) via the support plate (107); the connecting plate in the top support assembly is a support plate B (108); the connecting plate in the middle support assembly is a support plate A (106); and the connecting plate in the bottom support assembly is a fixed plate (104); the oil cup is mounted on the support plate B (108); the oil drip nozzle (114) is mounted on the support plate A (106); and the clamping assembly is mounted on the fixed plate (104).

6. The device for testing the ignition voltage of an aircraft engine ignition nozzle according to claim 5, characterized in that: The oil drip assembly further comprises a joint A (111), an electric regulating valve (112), and a joint B (113); the oil cup comprises a cover (109) and a cup body (110); the cup body (110) and the electric regulating valve (112) are in communication via the joint A (111); and the oil drip nozzle (114) and the electric regulating valve (112) are in communication via the joint B (113).

7. The device for testing the ignition voltage of an aircraft engine ignition nozzle according to claim 5, characterized in that: The clamping assembly comprises a product clamp (115), a pin (116), a movable bolt (117), a knurled nut (118), a retaining ring (119), and a sealing rubber ring (120). The sealing rubber ring (120) is installed at the bottom of the product clamp (115). A plurality of pins (116) are installed on the wall surface of the product clamp (115). The retaining ring (119) is inserted from the bottom of the product clamp (115). A plurality of movable bolts (117) are installed on the fixed plate (104) in a sliding connection. The movable bolts (117) are threadedly connected with the knurled nuts (118).

8. The device for testing the ignition voltage of an aircraft engine ignition nozzle according to claim 4, characterized in that: The mounting seat comprises a base (101), a nut (121), a spring washer (122), a flat washer (123), and a hexagonal bolt (124); the sliding rod (102) is mounted on the base (101); a plurality of hexagonal bolts (124) are mounted on the base (101); a flat washer (123) and a spring washer (122) are sleeved on the fixing plate (104); and the nut (121) is threadedly connected to the hexagonal bolt (124).

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