An experimental system for measuring a fuel spray field and its experimental device

Abstract

The present invention relates to a test system and a test device for measuring a fuel spray field. The test device for measuring a fuel spray field includes a test pipeline, and a front flange and a rear flange arranged at both ends of the test pipeline. The test pipeline includes a central body, and an air test flow channel runs through the central body; an oil circuit assembly, including an oil inlet pipe, an oil pipe flange and a nozzle. The oil pipe flange is fixed on the central body, the oil inlet pipe is fixedly fitted with the oil pipe flange, the oil inlet pipe passes through the oil pipe flange, and the nozzle is arranged at the tail end of the oil inlet pipe and falls into the air test flow channel; a window assembly for observing the fuel spray state of the nozzle, including a cover plate and a transparent sheet, and the transparent sheet is fixed on the central body through the cover plate. The present invention provides a test system and a test device for measuring a fuel spray field, which can simulate the continuous air flow environment of high air temperature and high air pressure in an aeroengine and perform various optical tests on the atomization performance of a fuel nozzle.

Description

Technical Field

[0001] The invention relates to the technical field of combustion testing of aircraft engines, and in particular to a testing system and a testing device for measuring a fuel spray field. Background Art

[0002] The fuel nozzle is one of the key components of the gas turbine engine combustion chamber. The atomization quality of the fuel nozzle directly determines the working performance of the combustion chamber. Measuring the nozzle oil mist characteristics plays an important role in the nozzle design, improvement and development of the combustion chamber. Therefore, domestic and foreign researchers have used advanced optical diagnostic measurement technology to measure and study the nozzle fuel atomization characteristics and have done a lot of work.

[0003] However, most of the measurements and tests are conducted under normal temperature and pressure, and only a few are conducted under high temperature and high pressure. Although these studies have certain guiding significance for the development of fuel nozzles, the actual working environment of fuel nozzles in the combustion chamber is mostly high temperature and high pressure or low temperature and low pressure. The existing test system cannot fully simulate the high temperature and high pressure or low temperature and low pressure environment in which the fuel nozzle actually works in the combustion chamber. The research on the spray characteristics of fuel nozzles cannot fully present the actual characteristics of the fuel nozzle spray and cannot truly reflect the nozzle spray quality.

[0004] In the field of internal combustion engines, the study of fuel nozzles under high temperature and high pressure conditions can be carried out in a constant volume bomb. In a constant volume bomb, the fuel is injected into the static gas by pre-inputting compressed gas to simulate the high pressure of the environment. However, when the nozzle of an aircraft engine is working, there is a constant flow of air around it, so the constant volume bomb test method cannot be directly applied to the environment with a large amount of air flow in the combustion chamber of an aircraft engine. Summary of the invention

[0005] In view of the above problems of the prior art, the present invention proposes a test system and a test device for measuring the fuel spray field, which can simulate the continuous airflow environment of high air temperature and high air pressure of an aircraft engine and perform various optical tests on the atomization performance of a fuel nozzle.

[0006] Specifically, the present invention proposes a test device for measuring a fuel spray field, comprising a test pipeline, and a front flange and a rear flange arranged at both ends of the test pipeline, wherein the test pipeline comprises:

[0007] A central body, wherein an air test flow channel runs through the central body;

[0008] The oil circuit assembly includes an inlet pipe, a pipe flange, and a nozzle. The pipe flange is fixed on the central body. The inlet pipe is fixedly fitted with the pipe flange and passes through the pipe flange. The nozzle is arranged at the tail end of the inlet pipe, and the nozzle falls into the air test flow channel.

[0009] The window assembly is used to observe the fuel spray state of the nozzle and includes a cover plate and a transparent sheet. The transparent sheet is fixed on the central body through the cover plate.

[0010] The flow channel adjustment assembly includes an adjustment plate arranged on the central body. The adjustment plate is used to set the cross-sectional area of the air test flow channel.

[0011] According to an embodiment of the present invention, the oil circuit assembly further includes a first fixing screw. A first mounting seat is provided on the central body. The first mounting seat forms a groove for accommodating the pipe flange. A first screw hole is provided at the bottom of the groove. The first fixing screw is in threaded fit with the first screw hole for fixation. The pipe flange is fixed on the central body through the first fixing screw.

[0012] According to an embodiment of the present invention, the inlet pipe is fixedly welded to the pipe flange.

[0013] According to an embodiment of the present invention, the oil circuit assembly further includes an adjustment seat arranged at the tail end of the inlet pipe. The nozzle is fixed at the tail end of the inlet pipe through the adjustment seat. The adjustment seat can adjust the fuel injection direction of the nozzle.

[0014] According to an embodiment of the present invention, it further includes a first sealing ring. A sealing groove is formed at the inner edge of the groove of the first mounting seat. The first sealing ring is placed in the sealing groove, and the pipe flange is closely attached to the first sealing ring.

[0015] According to an embodiment of the present invention, it further includes a second fixing screw. A second mounting seat is provided on the central body. The second mounting seat forms a groove for accommodating the cover plate. The transparent sheet is arranged at the bottom of the groove. A second screw hole is provided on the central body. The second fixing screw is in threaded fit with the second screw hole for fixation. The cover plate is fixed on the central body through the second fixing screw so that the cover plate presses the transparent sheet.

[0016] According to an embodiment of the present invention, it further includes a second sealing ring and a third sealing ring. The second sealing ring is arranged between the transparent sheet and the cover plate and is located on the top surface of the edge of the transparent sheet. The third sealing ring is arranged between the transparent sheet and the central body.

[0017] According to an embodiment of the present invention, it further includes a third fixing screw. A third screw hole is formed on the central body, and the third fixing screw is threadedly engaged and fixed with the third screw hole. The adjusting plate is fixed to the central body by the third fixing screw.

[0018] According to an embodiment of the present invention, it further includes a film-forming body disposed on the central body. A plurality of cavities are formed in the film-forming body, and small holes communicating with the cavities are formed on the outer side of the film-forming body facing the air test flow channel.

[0019] According to an embodiment of the present invention, it further includes a temperature-measuring wire and a heating wire that penetrate the small holes and extend into the cavities. A thermometer and a controller are respectively connected to one ends of the temperature-measuring wire and the heating wire.

[0020] According to an embodiment of the present invention, a step is provided on one side of the film-forming body facing the air test flow channel.

[0021] According to an embodiment of the present invention, a rectifying section is formed at the top of the step. In the air inlet direction of the air test flow channel, the height of the rectifying section gradually rises.

[0022] The present invention also provides a test system for measuring a fuel spray field, including a laser light source, a camera, a computer, and the aforementioned test device. The laser light source projects laser light into the air test flow channel through the window assembly, the camera takes a spray image of the nozzle through the window assembly, and the computer is connected to the camera for storing digital records of the spray image.

[0023] According to an embodiment of the present invention, it further includes a compressor, a gas storage cylinder, a pressure regulating valve, a flow meter, a heater, a front measurement section, a back pressure valve, and an exhaust gas processor. The high-pressure air produced by the compressor is stored in the gas storage cylinder, and the set-pressure air flow is directed to the heater and the flow meter through the pressure regulating valve. Subsequently, the high-temperature and high-pressure air flow enters the front measurement section and then enters the test device. After the high-temperature and high-pressure air flow forms an oil-gas mixture with the fuel, it enters the exhaust gas processor through the back pressure valve.

[0024] A test system for measuring a fuel spray field and its test device provided by the present invention can simulate the continuous air flow environment of high air temperature and high air pressure in an aeroengine and perform various optical tests on the atomization performance of a fuel nozzle.

[0025] It should be understood that the above general description and the following detailed description of the present invention are both exemplary and explanatory, and are intended to provide further explanation of the present invention as claimed. Brief Description of the Drawings

[0026] The accompanying drawings are provided to offer a further understanding of the present invention, and they are incorporated into and constitute a part of this application. The drawings illustrate embodiments of the present invention and, together with this specification, serve to explain the principles of the present invention.

[0027] In the drawings:

[0028] Figure 1 It shows a schematic structural diagram of a test device for measuring a fuel spray field according to an embodiment of the present invention.

[0029] Figure 2 is Figure 1 a partial cross-section of Figure 1 .

[0030] Figure 3 is Figure 1 a partial cross-section of Figure 2 .

[0031] Figure 4 It shows a schematic structural diagram of a central body according to an embodiment of the present invention.

[0032] Figure 5 It shows a schematic structural diagram of an oil circuit assembly according to an embodiment of the present invention.

[0033] Figure 6 It shows a schematic structural diagram of a window assembly according to an embodiment of the present invention.

[0034] Figure 7 It shows a schematic structural diagram of a central body and an adjusting plate according to an embodiment of the present invention.

[0035] Figure 8 It shows a schematic structural diagram of a test device for measuring a fuel spray field according to another embodiment of the present invention.

[0036] Figure 9 It shows a schematic structural diagram of a film-forming body according to an embodiment of the present invention.

[0037] Figure 10 It shows a schematic structural diagram of a test device for measuring a fuel spray field according to another embodiment of the present invention.

[0038] Figure 11 is Figure 10 a three-dimensional view of the oil circuit assembly and the film-forming body in

[0039] Figure 12 is Figure 10 a schematic structural diagram of the film-forming body in

[0040] Figure 13 It shows a schematic structural diagram of a test system for measuring a fuel spray field according to an embodiment of the present invention.

[0041] Among them, the above-mentioned drawings include the following drawing reference numerals:

[0042] Test device 100, test pipeline 101

[0043] Front flange 102, rear flange 103

[0044] Central body 104, oil circuit assembly 105

[0045] Viewing window assembly 106, flow channel adjustment assembly 107

[0046] Air test flow channel 108, oil inlet pipe 109

[0047] Oil pipe flange 110, nozzle 111

[0048] Cover plate 112, transparent sheet 113

[0049] Adjusting plate 114, first fixing screw 115

[0050] First mounting seat 116, first screw hole 117

[0051] Adjusting seat 118, first sealing ring 119

[0052] Sealing groove 120, second mounting seat 121

[0053] Second screw hole 122, second sealing ring 123

[0054] Third sealing ring 124, third fixing screw 125

[0055] Film-forming body 126, cavity 127

[0056] Small hole 128, temperature measuring wire 129

[0057] Heating wire 130, thermometer 131

[0058] Controller 132, spraying 133, 133'

[0059] Second fixing screw 134, third screw hole 135

[0060] Step 136, oil film 137

[0061] Rectifying section 138

[0062] Test system 200, laser light source 201

[0063] Camera 202, computer 203

[0064] Compressor 204, gas storage cylinder 205

[0065] Pressure regulating valve 206, Flowmeter 207

[0066] Front measurement section 208, Back pressure valve 209

[0067] Tail gas processor 210, Control unit 211

[0068] Heater 212 Specific implementation manners

[0069] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments may be combined with each other.

[0070] Next, the technical solutions in the embodiments of this application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restricts this application and its application or use. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of this application.

[0071] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary embodiments according to this application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0072] Unless otherwise specifically stated, the relative arrangements of the components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of this application. At the same time, it should be understood that for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0073] In the description of this application, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description. Without contrary instructions, these orientation words do not indicate and imply that the device or component referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of this application; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0074] For ease of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above-mentioned", etc. can be used here to describe the spatial positional relationship between a device or feature shown in the drawings and other devices or features. It should be understood that spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations are made for the spatial relative descriptions used here.

[0075] In addition, it should be noted that the use of terms such as "first", "second", etc. to limit components is only for the convenience of differentiating the corresponding components. Without additional statements, the above terms have no special meanings. Therefore, it should not be construed as a limitation on the protection scope of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant according to his or her judgment, and their detailed meanings are described in the relevant parts of this description. In addition, it is required to understand this application not only through the actual terms used, but also through the meanings implied by each term.

[0076] Figure 1 The structural schematic diagram of the test device for measuring the fuel spray field according to an embodiment of the present invention is shown. Figure 2 is Figure 1 a partial cross-section of Figure 1 . Figure 3 is Figure 1 a partial cross-section of Figure 2 . Figure 4 The structural schematic diagram of the central body in an embodiment of the present invention is shown. As Figure 1 and Figure 2As shown in the figure, a test device 100 for measuring a fuel spray field includes a test pipeline 101, and a front flange 102 and a rear flange 103 provided at both ends of the test pipeline 101. Among them, the test pipeline 101 mainly includes a central body 104, an oil circuit assembly 105, a window assembly 106, and a flow channel adjustment assembly 107.

[0077] An air test flow channel 108 runs through the central body 104. The gas that has been heated and pressurized enters the air test flow channel 108 from one side of the front flange 102, and the mixed gas after combustion is discharged from one side of the rear flange 103.

[0078] The oil circuit assembly 105 includes an oil inlet pipe 109, an oil pipe flange 110, and a nozzle 111. The oil pipe flange 110 is fixed on the central body 104, and the oil inlet pipe 109 is fixedly fitted with the oil pipe flange 110. The oil inlet pipe 109 passes through the oil pipe flange 110, and the nozzle 111 is provided at the tail end of the oil inlet pipe 109. The nozzle 111 falls into the air test flow channel 108. The fuel sprayed by the nozzle 111 forms a spray 133 and burns in the air test flow channel 108.

[0079] The window assembly 106 is mainly used to observe the state of the fuel spray 133 of the nozzle 111. The window assembly 106 includes a cover plate 112 and a transparent sheet 113. The transparent sheet 113 is fixed on the central body 104 through the cover plate 112. In one embodiment, the transparent sheet 113 is made of quartz glass. Refer to Figure 3 , the bottom surface of the transparent sheet 113 cooperates with the central body 104 so that the cross-section of the air test flow channel 108 is a flat rectangle, ensuring that the air test flow channel 108 is not affected by the opening of the window assembly 106, that is, there is no additionally introduced window area recirculation zone and corner vortex zone.

[0080] The flow channel adjustment assembly 107 is used to set the cross-sectional area of the air test flow channel 108. The flow channel adjustment assembly 107 includes an adjustment plate 114 provided on the central body 104. According to the test requirements, adjustment plates 114 with different thicknesses are replaced to change the cross-sectional area of the air test flow channel 108.

[0081] Figure 5 The structural schematic diagram of the oil circuit assembly in an embodiment of the present invention is shown. Preferably, the oil circuit assembly 105 further includes a first fixing screw 115. Combining Figure 2 and Figure 4As shown, a first mounting seat 116 is provided on the central body 104. The first mounting seat 116 forms a groove for accommodating the oil pipe flange 110. A first screw hole 117 is provided at the bottom of the groove. The first fixing screw 115 is threadedly engaged and fixed with the first screw hole 117. A through hole is provided on the oil pipe flange 110, and the first fixing screw 115 passes through the through hole and is engaged and fixed with the first screw hole 117. The oil pipe flange 110 is fixed on the central body 104 by the first fixing screw 115, so that the nozzle 111 is positioned within the air test flow path 108. More preferably, the inlet oil pipe 109 is fixedly welded to the oil pipe flange 110 to enhance the structural stability of the oil circuit assembly 105.

[0082] Preferably, the oil circuit assembly 105 further includes an adjustment seat 118 provided at the tail end of the inlet oil pipe 109. The nozzle 111 is fixed to the tail end of the inlet oil pipe 109 through the adjustment seat 118, and the adjustment seat 118 can adjust the oil injection direction of the nozzle 111 to adapt to different test requirements.

[0083] Preferably, the oil circuit assembly 105 further includes a first sealing ring 119. A sealing groove 120 is formed at the inner edge of the groove of the first mounting seat 116. The first sealing ring 119 is placed in the sealing groove 120, the oil pipe flange 110 is in close contact with the first sealing ring 119, and a sealing structure is formed between the oil pipe flange 110 and the central body 104.

[0084] Figure 6 The structural schematic diagram of the window assembly 106 in an embodiment of the present invention is shown. Preferably, the window assembly 106 further includes a second fixing screw 134. Combining Figure 2 and Figure 4 As shown, a second mounting seat 121 is provided on the central body 104. The second mounting seat 121 forms a groove for accommodating the cover plate 112. The transparent sheet 113 is provided at the bottom of the groove. A second screw hole 122 is provided on the central body 104, and the second fixing screw 134 is threadedly engaged and fixed with the second screw hole 122. A through hole is provided on the cover plate 112, and the second fixing screw 134 passes through the through hole and is engaged and fixed with the second screw hole 122. The cover plate 112 is fixed on the central body 104 by the second fixing screw 134, so that the cover plate 112 presses the transparent sheet 113. More preferably, the longitudinal section of the transparent sheet 113 is T-shaped, which is convenient for assembly and its bottom surface is adapted to the central body 104 to ensure that the cross-section of the air test flow path 108 is a flat rectangle.

[0085] Preferably, the window assembly 106 further includes a second sealing ring 123 and a third sealing ring 124. The second sealing ring 123 is disposed between the transparent sheet 113 and the cover plate 112, and is located on the top surface of the edge of the transparent sheet 113. The third sealing ring 124 is disposed between the transparent sheet 113 and the central body 104, and is located on the bottom surface of the edge of the transparent sheet 113. The transparent sheet 113 is clamped between the cover plate 112 and the central body 104, and the transparent sheet 113 is spaced apart by the second sealing ring 123 and the third sealing ring 124 and does not directly contact the cover plate 112 and the central body 104, so as to improve the observation effect.

[0086] Figure 7 The structural schematic diagram of the central body 104 and the adjusting plate 114 in an embodiment of the present invention is shown. Preferably, the flow path adjusting assembly 107 further includes a third fixing screw 125. A third screw hole 135 is formed in the central body 104, and the third fixing screw is threadedly engaged and fixed with the third screw hole 135. The adjusting plate 114 is fixed to the central body 104 by the third fixing screw 125. In this embodiment, two adjusting plates 114 are included, which are respectively disposed on both sides of the central body 104 close to the front flange 102 and the rear flange 103, and are fixed by the third fixing screw 125. More preferably, a sealant is applied between the contact surfaces of the adjusting plate 114 and the central body 104 to reduce heat loss and improve airtightness.

[0087] It should be noted that, in this embodiment, the central body 104 is rectangular, and the window assembly 106 can be disposed on four surfaces in the length direction of the central body 104 to observe the spraying 133 state of the nozzle 111.

[0088] Figure 8 The structural schematic diagram of the test device for measuring the fuel spray field in another embodiment of the present invention is shown. Figure 9 The structural schematic diagram of the film-forming body in an embodiment of the present invention is shown. Preferably, the test device 100 for measuring the fuel spray field further includes a film-forming body 126 disposed on the central body 104. A plurality of cavities 127 are formed in the film-forming body 126, and small holes 128 communicating with the cavities 127 are formed on the outer side of the film-forming body 126 facing the air test flow path 108. The film-forming body 126 is mainly used to study and measure the spray 133 trajectory and wet wall characteristics in the cross-flow. More preferably, the test device 100 further includes a temperature measuring wire 129 and a heating wire 130 that penetrate into the small holes 128 and extend into the cavities 127. A thermometer 131 and a controller 132 are respectively connected to one ends of the temperature measuring wire 129 and the heating wire 130 to respectively perform temperature measurement and heating control on the cavities 127 of the film-forming body 126, so as to realize the monitoring or manual control of the temperature of the spray impact wall surface, and form a controllable temperature difference between the impact wall surface, the flowing air flow, and the fuel temperature. As Figure 8As shown, when observing the trajectory of the spray 133 and the wet wall characteristics, the injection direction of the nozzle 111 is adjusted so that the central axis of the spray 133 forms an angle with the lateral intake air direction, which helps to quickly conduct the test. In this embodiment, the film-forming body 126 is arranged at the bottom of the central body 104. By way of example and not limitation, the film-forming body 126 can also be arranged on the side of the central body 104, or the film-forming body 126 can replace the window assembly 106. For example, the film-forming body 126 is fixedly engaged with the second mounting seat 121 to complete the measurement of the shape of the spray 133, the wet wall characteristics, and the flow characteristics of the fuel film on the wall surface.

[0089] Figure 10 The structural schematic diagram of the test device for measuring the fuel spray field according to another embodiment of the present invention is shown. Figure 11 is Figure 10 the three-dimensional view of the middle oil circuit assembly and the film-forming body. Figure 12 is Figure 10 the structural schematic diagram of the film-forming body in. As Figure 10 shown, a step 136 is arranged on the side of the film-forming body 126 facing the air test flow channel 108. At the position of the step 136, along the intake air direction (the direction indicated by the black arrow), the cross-section of the air test flow channel 108 gradually becomes larger. The test device 100 is used to measure the process of the fuel film flowing on the wall surface and separating at the step after the spray 133 wets the wall. The spray 133 formed by the nozzle 111 forms an oil film 137 on the surface of the film-forming body 126. The oil film 137 moves downstream under the blowing of the air flow and separates at the step 136 to form a new spray 133'.

[0090] Preferably, referring to Figure 11 and Figure 12 , a rectifying section 138 is formed at the top of the step 136. In the air inlet direction (the direction indicated by the black arrow) of the air test flow channel 108, the height of the rectifying section 138 gradually rises, and the tail end of the rectifying section 138 is integrated with the top edge of the step 136. The function of the rectifying section 138 is to make the air flow as smooth as possible before reaching the drop position of the step 136.

[0091] Figure 13 The structural schematic diagram of the test system 200 for measuring the fuel spray field according to an embodiment of the present invention is shown. As shown in the figure, the present invention also provides a test system 200 for measuring the fuel spray field, including a laser light source 201, a camera 202, a computer 203, and the aforementioned test device 100. The laser light source 201 projects laser light into the air test flow channel 108 through the window assembly 106 of the test device 100. The camera 202 takes images of the spray 133 of the nozzle 111 through the window assembly 106. The computer 203 is connected to the camera 202 and is used to store the digital records of the images of the spray 133.

[0092] Preferably, the test system 200 further includes a compressor 204, a gas storage cylinder 205, a pressure regulating valve 206, a flow meter 207, a heater 212, a front measurement section 208, a back pressure valve 209, and an exhaust gas processor 210. The high-pressure air produced by the compressor 204 is stored in the gas storage cylinder 205. The set-pressure air flow is directed to the heater 212 and the flow meter 207 through the pressure regulating valve 206. Subsequently, the high-temperature and high-pressure air flow enters the front measurement section 208 and then enters the test device 100. After the high-temperature and high-pressure air flow forms an oil-gas mixture with the fuel, it enters the exhaust gas processor 210 through the back pressure valve 209.

[0093] More preferably, the test system 200 further includes a control unit 211. The control unit 211 is connected to the test device 100 and is used to measure the spray pattern and the spray wetting wall characteristics of the test device under high inlet temperature and high inlet pressure conditions.

[0094] The test system and the test device for measuring a fuel spray field provided by the present invention have the following beneficial effects:

[0095] 1. Achieve multiple optical tests in a continuous air flow under high air temperature and high air pressure environments. The laser light source and the camera can be flexibly arranged in four mutually perpendicular directions according to requirements; the optical paths in these four directions are connected, and various types of spray field tests can be carried out, including: spray field pattern, axial / longitudinal spatial distribution of droplets, liquid film formed by the interaction between droplets and the wall, etc.;

[0096] 2. The fuel or liquid injection can be adjusted in terms of nozzle type and injection direction by replacing the oil circuit components according to actual needs, which helps to quickly carry out the test and reduce the test cost;

[0097] 3. The cross-sectional area of the air test flow channel can be adjusted by changing the thickness of the transparent sheet of the window assembly or the height of the film-forming body, supplemented by an adapted adjustment plate, so as to improve the test efficiency;

[0098] 4. When studying the wetting wall characteristics of nozzle sprays, different impingement wall distances of the spray can be achieved by selecting a suitable film-forming body and adjustment plate, and the wall temperature can be monitored and controlled;

[0099] 5. On the basis of ensuring that the internal flow field cross-section of the test channel is smooth and flat, the opening of the window assembly can be realized. The flatness of the inner wall surface of the measurement section is achieved by using a window glass with a T-shaped cross-section, ensuring that the internal flow field is not affected by the opening of the window assembly, that is, there are no additional introduced window area recirculation zones and corner vortex zones;

[0100] 6. The temperature of the wall hit by the liquid can be freely adjusted. The impingement wall temperature is adjusted through the controller, supporting the study of the influence of different wall temperatures on the wetting wall effect of nozzle sprays, and realizing a controllable temperature difference between the impingement wall surface, the flowing air flow, and the fuel temperature;

[0101] 7. It can have the function of testing the flow, separation and breakup of the liquid film after the liquid impacts the wall surface, and can realize the measurement and research on the characteristics of the oil film movement blown by the air flow and the separation and further atomization characteristics at the step after spraying and wetting the wall surface of the film-forming body.

[0102] It will be apparent to those skilled in the art that various modifications and variations can be made to the above exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Accordingly, it is intended that the present invention cover modifications and variations of the present invention falling within the scope of the appended claims and their equivalent technical solutions.

Claims

1. A test device for measuring a fuel spray field, comprising a test pipeline, and a front flange and a rear flange arranged at both ends of the test pipeline. The test pipeline includes a central body with an air test flow passage penetrating therethrough; an oil circuit assembly including an oil inlet pipe, an oil pipe flange and a nozzle. The oil pipe flange is fixed on the central body. The oil inlet pipe is fixedly fitted with the oil pipe flange. The oil inlet pipe passes through the oil pipe flange. The nozzle is arranged at the tail end of the oil inlet pipe, and the nozzle falls into the air test flow passage; a window assembly for observing the fuel spray state of the nozzle, including a cover plate and a transparent sheet. The transparent sheet is fixed on the central body through the cover plate; a flow passage adjusting assembly including an adjusting plate arranged on the central body. The adjusting plate is used for setting the cross-sectional area of the air test flow passage.

2. The test device for measuring a fuel spray field according to claim 1, characterized in that, The oil circuit assembly further includes a first fixing screw. A first mounting seat is formed on the central body. The first mounting seat forms a groove for accommodating the oil pipe flange. A first screw hole is formed at the bottom of the groove. The first fixing screw is in threaded fit with the first screw hole to fix the oil pipe flange on the central body.

3. The test device for measuring a fuel spray field according to claim 2, characterized in that, The oil inlet pipe is fixedly welded to the oil pipe flange.

4. The test device for measuring a fuel spray field according to claim 2, characterized in that, The oil circuit assembly further includes an adjusting seat arranged at the tail end of the oil inlet pipe. The nozzle is fixed at the tail end of the oil inlet pipe through the adjusting seat, and the adjusting seat can adjust the fuel injection direction of the nozzle.

5. The test device for measuring the fuel spray field according to claim 2, characterized in that, It further includes a first sealing ring. A sealing groove is formed at the inner edge of the groove of the first mounting seat. The first sealing ring is placed in the sealing groove, and the oil pipe flange is in close contact with the first sealing ring.

6. The test device for measuring the fuel spray field according to claim 1, wherein It further includes a second fixing screw. A second mounting seat is formed on the central body. The second mounting seat forms a groove for accommodating the cover plate. The transparent sheet is arranged at the bottom of the groove. A second screw hole is formed on the central body. The second fixing screw is in threaded fit with the second screw hole to fix the cover plate on the central body so that the cover plate presses the transparent sheet.

7. The test device for measuring the fuel spray field according to claim 6, wherein It further includes a second sealing ring and a third sealing ring. The second sealing ring is arranged between the transparent sheet and the cover plate and is located on the top surface of the edge of the transparent sheet. The third sealing ring is arranged between the transparent sheet and the central body.

8. The test device for measuring a fuel spray field according to claim 1, wherein, It further includes a third fixing screw. A third screw hole is formed on the central body. The third fixing screw is in threaded fit with the third screw hole to fix the adjusting plate on the central body.

9. The test device for measuring the fuel spray field according to claim 1, wherein, It further includes a film-forming body arranged on the central body. A plurality of cavities are formed in the film-forming body, and small holes communicating with the cavities are formed on the outer side of the film-forming body facing the air test flow passage.

10. The test device for measuring the fuel spray field according to claim 9, characterized in that, It further includes a temperature measuring wire and a heating wire penetrating into the small holes and extending into the cavities. A thermometer and a controller are respectively connected to one ends of the temperature measuring wire and the heating wire.

11. The test device for measuring the fuel spray field according to claim 9, wherein A step is arranged on one side of the film-forming body facing the air test flow passage.

12. The test device for measuring a fuel spray field according to claim 11, characterized in that, A rectifying section is formed at the top of the step. In the air inlet direction of the air test flow passage, the height of the rectifying section gradually rises.

13. An experimental system for measuring a fuel spray field, comprising a laser light source, a camera and a computer, and the experimental device according to any one of claims 1 to 10. The laser light source projects laser light through the window assembly into the air test flow channel, the camera takes a spray image of the nozzle through the window assembly, and the computer is connected to the camera and is used for storing digital records of the spray image.

14. The test system for measuring a fuel spray field according to claim 13, wherein, It further comprises a compressor, a gas storage cylinder, a pressure regulating valve, a flowmeter, a heater, a front measurement section, a back pressure valve and an exhaust gas processor. The high-pressure air produced by the compressor is stored in the gas storage cylinder, and the set-pressure air flow is directed to the heater and the flowmeter through the pressure regulating valve. Subsequently, the high-temperature and high-pressure air flow enters the front measurement section and then enters the experimental device. After the high-temperature and high-pressure air flow forms an oil-gas mixture with the fuel, it enters the exhaust gas processor through the back pressure valve.

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