Liquid ammonia / diesel oil dual-fuel spray optical diagnosis device and method

Abstract

The invention discloses a liquid ammonia / diesel oil dual-fuel spray optical diagnosis device and method. A laser beam emitted by a first laser passes through a first beam expander and a first reflector, is processed by a second harmonic separator and enters a constant volume combustion bomb; wherein laser beams emitted by the second laser and the third laser pass through the first harmonic separator, then are processed by the second harmonic separator and enter the constant volume combustion bomb; sheet laser emitted by the fourth laser enters the constant-volume combustion bomb; a laser beam passes through the constant volume combustion bomb, passes through the third harmonic separator, passes through the first convex lens and the first BPF and then is shot by the first CCD camera, passes through the second convex lens and the second BPF and then is shot by the second CCD camera, passes through the third convex lens and the third BPF and then is shot by the third CCD camera, and passes through the fifth harmonic separator and the fourth BPF and then is shot by the fourth CCD camera. According to the invention, the concentration of the mixed gas of the liquid ammonia spray and the diesel oil / liquid ammonia mixed spray is accurately measured.

Description

Technical Field

[0001] The invention relates to the technical field of engine optical diagnosis, in particular to synchronous measurement of gas / liquid two-phase concentration distribution and velocity distribution of liquid ammonia / diesel dual fuel. Background Art

[0002] In the current low-carbon and zero-carbon context, ammonia, as a zero-carbon fuel, has the advantages of high alkyl number and good anti-knock performance. It can use high compression ratio to improve the thermal efficiency of the engine, achieve efficient combustion, and reduce carbon emissions. It is one of the ideal green fuels for achieving "carbon neutrality".

[0003] Ammonia fuel has problems such as high ignition temperature and lower flammable limit concentration, difficulty in ignition, slow flame propagation speed and poor combustion stability. Adopting a dual-fuel mode based on existing diesel engines is a feasible strategy. Liquid ammonia / diesel high-pressure dual direct injection engines have significant advantages in volumetric energy efficiency, flexible and controllable injection strategy, reducing NOx emissions and ammonia slip, and increasing ammonia fuel substitution rate. However, due to its different physical properties from diesel, liquid ammonia has a complex atomization and evaporation process, making the precise control of liquid ammonia / diesel mixed spray mixture extremely challenging.

[0004] At present, there is no optical diagnosis technology for the concentration of liquid ammonia spray mixed gas, and the optical diagnosis technology for the concentration of liquid ammonia / diesel dual fuel mixed gas spray is even more blank. Therefore, it is extremely important to develop a precise measurement technology for the concentration of liquid ammonia spray and diesel / liquid ammonia mixed gas spray. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a liquid ammonia / diesel dual-fuel spray optical diagnostic device and method, so as to accurately measure the concentration of liquid ammonia spray and diesel / liquid ammonia mixed spray mixed gas.

[0006] The present invention achieves the above technical objectives through the following technical means.

[0007] A liquid ammonia / diesel dual-fuel spray optical diagnostic device comprises a first laser, a second laser, a third laser and a fourth laser; the first laser, the second laser, the third laser and the fourth laser are connected in parallel, wherein the laser beam emitted by the first laser is processed by a first beam expander and a first reflector and a second harmonic separator before entering a constant volume combustion bomb;

[0008] The laser beam emitted by the second laser passes through the second beam expander and the second reflector; the laser beam emitted by the third laser passes through the third beam expander and the diffusion film; wherein, the laser beams emitted by the second laser and the third laser pass through the first harmonic separator and then are processed by the second harmonic separator and enter the constant volume incendiary bomb; the sheet laser emitted by the fourth laser enters the constant volume incendiary bomb; the laser beam passes through the constant volume incendiary bomb, then the third harmonic separator, then the first convex lens and the first BPF, then is photographed by the first CCD camera, then passes through the second convex lens and the second BPF, then is photographed by the second CCD camera, then passes through the third convex lens and the third BPF, then is photographed by the third CCD camera, and then passes through the fifth harmonic separator and the fourth BPF, then is photographed by the fourth CCD camera.

[0009] In the above solution, the first BPF bandwidth is 193nm, the second BPF bandwidth is 266nm, the third BPF bandwidth is 632.8nm, and the fourth BPF bandwidth is 532nm.

[0010] In the above scheme, the first laser is an excimer laser, the second laser is an Nd:YAG laser, the third laser is a helium-neon laser, and the fourth laser is an Nd:YAG laser.

[0011] A detection method for a liquid ammonia / diesel dual-fuel spray optical diagnostic device, wherein when the diesel injector is working, the second laser, the third laser and the fourth laser are turned on, wherein the second laser emits 266nm ultraviolet light, the third laser emits 632.8nm visible light, and the fourth laser emits 532nm visible light;

[0012] The 266nm ultraviolet light passes through the second beam expander and then the second reflector, and merges with the 632.8nm visible light that passes through the third beam expander and the diffusion film and then passes through the first harmonic separator. The laser after the 266nm ultraviolet light and the 632.8nm visible light merge passes through the second harmonic separator and then passes through the diesel spray in the constant volume combustion bomb;

[0013] The 532nm visible light emitted by the fourth laser passes through the diesel spray in the constant volume combustion bomb, and the 266nm ultraviolet light, the 632.8nm visible light and the 532nm visible light are merged. The merged laser passes through the third harmonic separator and then passes through the fourth harmonic separator. The 266nm ultraviolet light is emitted through the second convex lens and then passes through the second BPF, and then is received by the second CCD camera; the 632.8nm and 532nm visible light pass through the fourth harmonic separator, of which the 532nm visible light passes through the fourth BPF and then is received by the fourth CCD camera, and the 632.8nm visible light passes through the third convex lens and then passes through the third BPF, and then is received by the third CCD camera.

[0014] In the above scheme, the distribution of gas / liquid two-phase concentration of diesel spray when the diesel injector is working is processed, and the gas and liquid mixed image of diesel is obtained by 266nm ultraviolet light, and the liquid phase image of diesel is obtained by 632.8nm visible light. The gas phase image is subtracted from the liquid phase image by the mixed image of the gas and liquid phases to obtain the gas phase image, and then the Bouguer-Lambert-Beer's law is used to obtain the gas phase concentration distribution, and the liquid phase mass is obtained by subtracting the gas phase mass from the total diesel mass, thereby obtaining the liquid phase concentration distribution.

[0015] A detection method for a liquid ammonia / diesel dual-fuel spray optical diagnostic device, wherein when the liquid ammonia injector is working, the first laser, the third laser and the fourth laser are turned on, the first laser emits 193nm ultraviolet light, the third laser emits 632.8nm visible light, and the fourth laser emits 532nm visible light;

[0016] The 193nm ultraviolet light passes through the first beam expander and then the first reflector, and merges with the 632.8nm visible light that passes through the third beam expander, the diffusion film, the first harmonic separator and the second harmonic separator; the laser light after the 193nm and 632.8nm convergence passes through the second harmonic separator and then passes through the liquid ammonia spray in the constant volume combustion bomb;

[0017] At the same time, the 532nm visible light emitted by the fourth laser passes through the liquid ammonia spray in the constant volume combustion bomb, and 193nm, 632.8nm and 532nm are merged. The merged laser passes through the third harmonic separator, and the 193nm ultraviolet light passes through the first convex lens and then passes through the first BPF, and is then received by the first CCD camera; the 632.8nm and 532nm visible light pass through the second harmonic separator and the fifth harmonic separator, among which the 532nm visible light passes through the fourth BPF and is received by the fourth CCD camera, and the 632.8nm visible light passes through the third convex lens and then passes through the third BPF, and is then received by the third CCD camera.

[0018] In the above scheme, the distribution of gas / liquid two-phase concentration of liquid ammonia spray is processed when the liquid ammonia injector is working. The mixed image of gas and liquid phases of liquid ammonia is obtained by 193nm ultraviolet light, and the liquid phase image of liquid ammonia is obtained by 632.8nm visible light. The mixed image of gas and liquid phases is subtracted from the liquid phase image to obtain the gas phase image, and then the Bouguer-Lambert-Beer's law is used to obtain the gas phase concentration distribution. The liquid phase mass is obtained by subtracting the gas phase mass from the total liquid ammonia mass, thereby obtaining the liquid phase concentration distribution.

[0019] The detection method of the liquid ammonia / diesel dual-fuel spray optical diagnostic device is as follows: when the diesel injector and the liquid ammonia injector are working at the same time, the first laser, the second laser, the third laser and the fourth laser are turned on, the first laser emits 193nm ultraviolet light, the second laser emits 266nm ultraviolet light, the third laser emits 632.8nm visible light, and the fourth laser emits 532nm visible light;

[0020] The 193nm ultraviolet light passes through the first beam expander and then the first reflector. At the same time, the 266nm ultraviolet light passes through the second beam expander and then the second reflector and the 632.8nm visible light passes through the third beam expander and the diffusion film and then passes through the first harmonic separator to merge. The 193nm, 266nm and 632.8nm lasers merge in the second harmonic separator, and the merged lasers pass through the liquid ammonia / diesel mixed spray in the constant volume combustion bomb.

[0021] At the same time, the 532nm visible light emitted by the fourth laser passes through the liquid ammonia / diesel mixed spray in the constant volume combustion bomb, and 193nm, 266nm, 632.8nm and 532nm are merged. The merged laser passes through the third harmonic separator, the 193nm ultraviolet light passes through the first convex lens and then passes through the first BPF, and is then received by the first CCD camera, the 266nm, 632.8nm and 532nm lasers pass through the fourth harmonic separator, the 266nm ultraviolet light passes through the second convex lens and then passes through the second BPF, and is then received by the second CCD camera; the 632.8nm and 532nm lasers pass through the fifth harmonic separator, of which the 532nm visible light passes through the fourth BPF and is received by the fourth CCD camera, and the 632.8nm visible light passes through the third convex lens and then passes through the third BPF, and is then received by the third CCD camera.

[0022] In the above scheme, the distribution of gas / liquid two-phase concentration of liquid ammonia / diesel dual-fuel spray is processed when the diesel injector and the liquid ammonia injector work simultaneously, and the gas and liquid phase mixed image of diesel is obtained by 266nm ultraviolet light, the liquid phase image of diesel and liquid ammonia is obtained by 632.8nm visible light, and the gas and liquid phase mixed image of diesel and liquid ammonia is obtained by 193nm ultraviolet light; the liquid phase image of diesel is separated from the liquid phase image of diesel and liquid ammonia, and the diesel gas phase image is obtained by subtracting the diesel liquid phase image from the mixed image of diesel gas and liquid phase, and then the diesel gas phase concentration distribution is obtained by using Bouguer-Lambert-Beer's law, and the diesel liquid phase mass is obtained by subtracting the diesel gas phase mass from the total diesel mass, thereby obtaining the diesel liquid phase concentration distribution.

[0023] Beneficial effects:

[0024] 1. The present invention uses Nd:YAG laser (266nm) and He-Ne laser (632.8nm) to achieve the gas / liquid phase concentration distribution of diesel through laser absorption and scattering method.

[0025] 2. In the present invention, an excimer laser (193 nm) and a helium-neon laser (632.8 nm) are used to achieve the gas / liquid phase concentration distribution of liquid ammonia through laser absorption and scattering method.

[0026] 3. In the present invention, an excimer laser (193 nm), an Nd:YAG laser (266 nm) and a helium-neon laser (632.8 nm) are used to realize the gas / liquid phase concentration distribution of liquid ammonia / diesel dual fuels through a three-image separation method.

[0027] 4. In the present invention, the velocity field is measured by using Nd:YAG laser (532nm), and the velocity distribution of the spray is obtained while obtaining the gas / liquid phase concentration distribution of the liquid ammonia / diesel dual fuel. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the liquid ammonia / diesel dual-fuel optical testing system of the present invention;

[0029] Figure 2 It is a schematic diagram of the collision of diesel spray, liquid ammonia spray, and liquid ammonia / diesel spray according to the present invention;

[0030] Figure 3 It is a flow chart of diesel single fuel gas / liquid two-phase concentration distribution processing (laser absorption scattering method) in the liquid ammonia / diesel dual-fuel optical test system of the present invention;

[0031] Figure 4 It is a flow chart of the gas / liquid two-phase concentration distribution processing (laser absorption scattering method) of liquid ammonia single fuel in the liquid ammonia / diesel dual-fuel optical test system of the present invention;

[0032] Figure 5 The present invention provides a flow chart of the gas / liquid two-phase concentration distribution processing (three-image separation method) of the liquid ammonia / diesel dual-fuel in the liquid ammonia / diesel dual-fuel optical test system.

[0033] The reference numerals are as follows:

[0034] 1-first laser; 2-second laser; 3-third laser; 4-first beam expander; 5-second beam expander; 6-third beam expander; 7-diffusion film; 8-first reflector; 9-second reflector; 10-first harmonic separator; 11-second harmonic separator; 12-fourth laser; 13-diesel injector; 14-liquid ammonia injector; 15-constant volume combustion bomb; 16-third harmonic separator; 17-first convex lens; 18-first BPF; 19-first CCD camera; 20-fourth harmonic separator; 21-second convex lens; 22-second BPF; 23-second CCD camera; 24-fifth harmonic separator; 25-third convex lens; 26-third BPF; 27-third CCD camera; 28-fourth BPF; 29-fourth CCD camera; 30-diesel spray; 31-liquid ammonia spray; 32-liquid ammonia / diesel mixed spray. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like indicate positions or positional relationships based on the positions 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 cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0037] 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 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.

[0038] This case provides a liquid ammonia / diesel dual-fuel spray optical diagnostic device, in which the diesel is replaced by a mixture of 97.5% n-tridecane and 2.5% α-methylnaphthalene. For the convenience of writing, the word diesel is used uniformly.

[0039] The first laser 1 is a 193 nm excimer laser, the second laser 2 is a Nd:YAG laser, the third laser 3 is a helium-neon laser and the fourth laser 12 is a Nd:YAG laser.

[0040] (1) Figure 1 and Figure 2 As shown, when only the diesel injector 13 is working, the second laser 2, Nd:YAG laser, the third laser 3, helium-neon laser and the fourth laser 12, Nd:YAG laser are turned on; the second laser 2, Nd:YAG laser emits 266nm ultraviolet light, the third laser 3, helium-neon laser emits 632.8nm visible light, and the fourth laser 12, Nd:YAG laser emits 532nm visible light.

[0041] The 266nm ultraviolet light passes through the second beam expander 5 and then the second reflector 9, and merges with the 632.8nm visible light that passes through the third beam expander 6 and the diffusion film 7 and then the first harmonic separator 10. The laser beams after the merging of 266nm and 632.8nm pass through the second harmonic separator 11 and then pass through the diesel spray 30 in the constant volume combustion bomb 15.

[0042] The bandwidth of the first BPF18 is 193nm, and the bandwidth of the second BPF22 is 266nm. Image intensifiers are installed between the first BPF18 and the first CCD camera 19 and between the second BPF22 and the second CCD camera 23. The bandwidth of the third BPF26 ​​is 632.8nm, and the bandwidth of the fourth BPF28 is 532nm.

[0043] At the same time, the 532nm visible light emitted by the fourth laser 12, the Nd:YAG laser, passes through the diesel spray 30 in the constant volume combustion bomb 15, and the 266nm, 632.8nm and 532nm are combined. The combined laser passes through the harmonic separator 16, and then passes through the fourth harmonic separator 20. The 266nm ultraviolet light is emitted through the second convex lens 21, then passes through the second BPF 22 and the image intensifier, and then is received by the second CCD camera 23. The 632.8nm and 532nm visible lights pass through the fifth harmonic separator 24, wherein the 532nm visible light passes through the fourth BPF 28 and is received by the fourth CCD camera 29, and the 632.8nm visible light passes through the third convex lens 25 and then passes through the third BPF 26, and then is received by the third CCD camera 27.

[0044] like Figure 3The figure shows the distribution processing of the gas / liquid two-phase concentration of the diesel spray when only the diesel injector is working. The gas and liquid mixed image of the diesel is obtained by 266nm ultraviolet light, and the liquid phase image of the diesel is obtained by 632.8nm visible light. The gas phase image is obtained by subtracting the liquid phase image from the mixed image of the gas and liquid phases. Subsequently, the gas phase concentration distribution is obtained by using Bouguer-Lambert-Beer's law. The liquid phase mass is obtained by subtracting the gas phase mass from the total diesel mass, thereby obtaining the liquid phase concentration distribution.

[0045] (2) Figure 1 and Figure 2 As shown, when only the liquid ammonia injector 14 is working, the first laser 1, the excimer laser, the third laser 3, the helium-neon laser and the fourth laser 12, the Nd:YAG laser are turned on. The first laser 1, the excimer laser emits 193nm ultraviolet light, the third laser 3, the helium-neon laser emits 632.8nm visible light, and the fourth laser 12, the Nd:YAG laser emits 532nm visible light.

[0046] The 193nm ultraviolet light passes through the first beam expander 4 and then through the first reflector 8, and merges with the 632.8nm visible light that passes through the third beam expander 6 and the diffusion film 7 and then through the first harmonic separator 10 and the second harmonic separator 11. The laser beam after the 193nm and 632.8nm merge passes through the second harmonic separator 11 and then through the liquid ammonia spray 31 in the constant volume combustion bomb 15.

[0047] At the same time, the 532nm visible light emitted by the fourth laser 12, the Nd:YAG laser, passes through the liquid ammonia spray 31 in the constant volume combustion bomb 15, and the 193nm, 632.8nm and 532nm are combined. The combined laser passes through the third harmonic separator 16, and the 193nm ultraviolet light passes through the first convex lens 17, then passes through the first BPF 18 and the image intensifier, and is then received by the first CCD camera 19. The 632.8nm and 532nm visible lights pass through the fourth harmonic separator 20 and the fifth harmonic separator 24, wherein the 532nm visible light passes through the fourth BPF 28 and is then received by the fourth CCD camera 29, while the 632.8nm visible light passes through the third convex lens 25, then passes through the third BPF, and is then received by the third CCD camera 27.

[0048] like Figure 4The figure shows the distribution processing of the gas / liquid two-phase concentration of the liquid ammonia spray when only the liquid ammonia injector is working. The gas and liquid mixed image of liquid ammonia is obtained by 193nm ultraviolet light, and the liquid phase image of liquid ammonia is obtained by 632.8nm visible light. The gas phase image is subtracted from the liquid phase image by the mixed image of the gas and liquid phases to obtain the gas phase image, and then the Bouguer-Lambert-Beer's law is used to obtain the gas phase concentration distribution. The liquid phase mass is obtained by subtracting the gas phase mass from the total liquid ammonia mass, thereby obtaining the liquid phase concentration distribution.

[0049] (3) Figure 1 and Figure 2 As shown, when the diesel injector 13 and the liquid ammonia injector 14 work at the same time, the first laser 1, the excimer laser, the second laser 2, the Nd:YAG laser, the third laser 3, the helium-neon laser and the fourth laser 12, the Nd:YAG laser are turned on. The first laser 1, the excimer laser emits 193nm ultraviolet light, the second laser 2, the Nd:YAG laser emits 266nm ultraviolet light, the third laser 3, the helium-neon laser emits 632.8nm visible light, and the fourth laser 12, the Nd:YAG laser emits 532nm visible light.

[0050] The 193nm ultraviolet light passes through the first beam expander 4 and then through the first reflector 8. At the same time, the 266nm ultraviolet light passes through the second beam expander 5 and then through the second reflector 9 and the 632.8nm visible light passes through the third beam expander 6 and the diffusion film 7 and then through the first harmonic separator 10 to be combined. The 193nm, 266nm and 632.8nm lasers are combined in the second harmonic separator 11, and the combined lasers pass through the liquid ammonia / diesel mixed spray 32 in the constant volume combustion bomb 15.

[0051] At the same time, the 532nm visible light emitted by the fourth laser 12, the Nd:YAG laser, passes through the liquid ammonia / diesel mixed spray 32 in the constant volume combustion bomb 15, and the 193nm, 266nm, 632.8nm and 532nm are combined. The combined laser passes through the third harmonic separator 16, and the 193nm ultraviolet light passes through the first convex lens 17, then passes through the first BPF 18 and the image intensifier, and is then received by the first CCD camera 19. The 266nm, 632.8nm and 532nm lasers pass through the fourth harmonic separator 20, and the 266nm ultraviolet light passes through the second convex lens 21, then passes through the second BPF 22 and the image intensifier, and is then received by the second CCD camera 23. The 632.8nm and 532nm lasers pass through the fifth harmonic separator 24 , wherein the 532nm visible light passes through the fourth BPF 28 and is received by the fourth CCD camera 29 , while the 632.8nm visible light passes through the third convex lens 25 and then passes through the third BPF 26 and is then received by the third CCD camera 27 .

[0052] like Figure 5 The figure shows the distribution processing of the gas / liquid two-phase concentration of the liquid ammonia / diesel dual-fuel spray when the diesel injector and the liquid ammonia injector are working at the same time. The mixed image of the gas and liquid phase of diesel is obtained by 266nm ultraviolet light, the liquid phase image of diesel and liquid ammonia is obtained by 632.8nm visible light, and the mixed image of the gas and liquid phase of diesel and liquid ammonia is obtained by 193nm ultraviolet light. The liquid phase image of diesel is separated from the liquid phase image of diesel and liquid ammonia, and the diesel liquid phase image is subtracted from the mixed image of the gas and liquid phase of diesel to obtain the diesel gas phase image, and then the Bouguer-Lambert-Beer's law is used to obtain the diesel gas phase concentration distribution, and the diesel liquid phase mass is obtained by subtracting the diesel gas phase mass from the total diesel mass, thereby obtaining the diesel liquid phase concentration distribution.

[0053] The mixed image of the gas phase and liquid phase of diesel and liquid ammonia is subtracted from the mixed image of the liquid phase of diesel and liquid ammonia to obtain the gas phase image of diesel and liquid ammonia, and the gas phase image of diesel is subtracted again to obtain the gas phase of liquid ammonia. At the same time, the mixed image of the gas phase and liquid phase of diesel and liquid ammonia is subtracted from the mixed image of the gas phase and liquid phase of diesel to obtain the mixed image of the gas phase and liquid phase of liquid ammonia, and then the gas phase image of liquid ammonia is subtracted from the mixed image of the gas phase and liquid phase of liquid phase to obtain the liquid phase image of liquid ammonia, and then the Bouguer-Lambert-Beer's law is used to obtain the gas phase concentration distribution of liquid ammonia, and the liquid phase mass of liquid ammonia is obtained by subtracting the gas phase mass of liquid ammonia from the total liquid ammonia mass, thereby obtaining the liquid phase concentration distribution of liquid ammonia.

[0054] It should be noted that the present invention is not limited to the exemplary case details described above. Without violating the basic features of the present invention and the effects produced in the application field, the present invention can be expressed in various forms and can implement the content of the present invention in other specific schemes and forms. Therefore, all changes within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0055] The present invention is described in this specification using specific examples, which are only used to understand the technical core of the present invention. The content of this specification should not be understood as limiting the present invention.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0057] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A liquid ammonia / diesel dual-fuel spray optical diagnostic device, characterized in that: The invention comprises a first laser (1), a second laser (2), a third laser (3) and a fourth laser (12); the first laser (1), the second laser (2), the third laser (3) and the fourth laser (12) are connected in parallel, wherein the laser beam emitted by the first laser (1) is processed by a first beam expander (4) and a first reflector (8) and a second harmonic separator (11) and enters a constant volume incendiary bomb (15); the laser beam emitted by the second laser (2) is processed by a second beam expander (5) and a second reflector (9); the laser beam emitted by the third laser (3) is processed by a third beam expander (6) and a diffusion film (7); wherein the laser beams emitted by the second laser (2) and the third laser (3) are After passing through the first harmonic separator (10), the laser beam is processed by the second harmonic separator (11) and enters the constant volume incendiary bomb (15); the laser beam emitted by the fourth laser (12) enters the constant volume incendiary bomb (15); after passing through the constant volume incendiary bomb (15), the laser beam passes through the third harmonic separator (16), the first convex lens (17) and the first BPF (18), and is photographed by the first CCD camera (19); after passing through the second convex lens (20) and the second BPF (22), the laser beam is photographed by the second CCD camera (23); after passing through the third convex lens (25) and the third BPF (28), the laser beam is photographed by the third CCD camera (27); after passing through the fifth harmonic separator (24) and the fourth BPF (28), the laser beam is photographed by the fourth CCD camera (29).

2. The liquid ammonia / diesel dual-fuel spray optical diagnostic device according to claim 1, characterized in that: The bandwidth of the first BPF (18) is 193 nm, the bandwidth of the second BPF (22) is 266 nm, the bandwidth of the third BPF (26) is 632.8 nm, and the bandwidth of the fourth BPF (28) is 532 nm.

3. The liquid ammonia / diesel dual-fuel spray optical diagnostic device according to claim 1, characterized in that: The first laser (1) is an excimer laser, the second laser (2) is an Nd:YAG laser, the third laser (3) is a helium-neon laser, and the fourth laser (12) is an Nd:YAG laser.

4. The detection method of the liquid ammonia / diesel dual-fuel spray optical diagnostic device according to claim 1, characterized in that: When the diesel fuel injector (13) is in operation, the second laser (2), the third laser (3) and the fourth laser (12) are turned on, wherein the second laser (2) emits 266nm ultraviolet light, the third laser (3) emits 632.8nm visible light, and the fourth laser (12) emits 532nm visible light; The 266nm ultraviolet light passes through the second beam expander (5) and then through the second reflector (9), and is combined with the 632.8nm visible light that passes through the third beam expander (6) and the diffusion film (7) and then through the first harmonic separator (10). The laser beam obtained by combining the 266nm ultraviolet light and the 632.8nm visible light passes through the second harmonic separator (11) and then passes through the diesel spray (30) in the constant volume combustion bomb (15); The 532nm visible light emitted by the fourth laser (12) passes through the diesel spray (30) in the constant volume combustion bomb (15), the 266nm ultraviolet light, the 632.8nm visible light and the 532nm visible light are combined, and the combined laser passes through the third harmonic separator (16) and then passes through the fourth harmonic separator (20). The 266nm ultraviolet light is emitted through the second convex lens (21) and then passes through the second BPF (22) and then is received by the second CCD camera (23); the 632.8nm and 532nm visible light pass through the fourth harmonic separator (20), wherein the 532nm visible light passes through the fourth BPF (28) and then is received by the fourth CCD camera (29), and the 632.8nm visible light passes through the third convex lens (25) and then passes through the third BPF (26) and then is received by the third CCD camera (27).

5. The detection method of the liquid ammonia / diesel dual-fuel spray optical diagnostic device according to claim 4, characterized in that: The distribution of gas / liquid two-phase concentration of diesel spray when the diesel injector is working is processed. The mixed image of gas and liquid phases of diesel is obtained by 266nm ultraviolet light, and the liquid phase image of diesel is obtained by 632.8nm visible light. The gas phase image is subtracted from the liquid phase image by the mixed image of gas and liquid phases to obtain the gas phase image. Subsequently, the gas phase concentration distribution is obtained by using Bouguer-Lambert-Beer's law. The liquid phase mass is obtained by subtracting the gas phase mass from the total diesel mass, thereby obtaining the liquid phase concentration distribution.

6. The detection method of the liquid ammonia / diesel dual-fuel spray optical diagnostic device according to claim 1, characterized in that: When the liquid ammonia injector (14) is in operation, the first laser (1), the third laser (3) and the fourth laser (12) are turned on, the first laser (1) emits ultraviolet light of 193 nm, the third laser (3) emits visible light of 632.8 nm, and the fourth laser (12) emits visible light of 532 nm; The 193nm ultraviolet light passes through the first beam expander (4) and then through the first reflector (8), and merges with the 632.8nm visible light that passes through the third beam expander (6) and the diffusion film (7) and then through the first harmonic separator (10) and the second harmonic separator (11); the laser beam after the 193nm and 632.8nm merge passes through the second harmonic separator (11) and then passes through the liquid ammonia spray (31) in the constant volume combustion bomb (15); At the same time, the 532nm visible light emitted by the fourth laser (12) passes through the liquid ammonia spray (31) in the constant volume combustion bomb (15), and the 193nm, 632.8nm and 532nm are merged. The merged laser passes through the third harmonic separator (16), the 193nm ultraviolet light passes through the first convex lens (17) and then passes through the first BPF (18), and is then received by the first CCD camera (19); the 632.8nm and 532nm visible light pass through the second harmonic separator (20) and the fifth harmonic separator (24), wherein the 532nm visible light passes through the fourth BPF (28) and then is received by the fourth CCD camera (29), and the 632.8nm visible light passes through the third convex lens (25) and then passes through the third BPF (26), and is then received by the third CCD camera (27).

7. The detection method of the liquid ammonia / diesel dual-fuel spray optical diagnostic device according to claim 6, characterized in that: The distribution of gas / liquid two-phase concentration of liquid ammonia spray when the liquid ammonia injector is working is processed. The mixed image of gas and liquid phases of liquid ammonia is obtained by 193nm ultraviolet light, and the liquid phase image of liquid ammonia is obtained by 632.8nm visible light. The gas phase image is subtracted from the mixed image of gas and liquid phases to obtain the gas phase image. Subsequently, the gas phase concentration distribution is obtained by using Bouguer-Lambert-Beer's law. The liquid phase mass is obtained by subtracting the gas phase mass from the total liquid ammonia mass, thereby obtaining the liquid phase concentration distribution.

8. The detection method of the liquid ammonia / diesel dual-fuel spray optical diagnostic device according to claim 1, characterized in that: When the diesel fuel injector (13) and the liquid ammonia fuel injector (14) are working simultaneously, the first laser (1), the second laser (2), the third laser (3) and the fourth laser (12) are turned on, the first laser (1) emits 193nm ultraviolet light, the second laser (2) emits 266nm ultraviolet light, the third laser (3) emits 632.8nm visible light, and the fourth laser (12) emits 532nm visible light; The 193nm ultraviolet light passes through the first beam expander (4) and then through the first reflector (8). At the same time, the 266nm ultraviolet light passes through the second beam expander (5) and then through the second reflector (9) and the 632.8nm visible light passes through the third beam expander (6), the diffusion film (7) and then through the first harmonic separator (10) to be combined. The 193nm, 266nm and 632.8nm lasers are combined in the second harmonic separator (11), and the combined lasers pass through the liquid ammonia / diesel mixed spray (32) in the constant volume combustion bomb (15). At the same time, the 532nm visible light emitted by the fourth laser (12) passes through the liquid ammonia / diesel mixed spray (32) in the constant volume combustion bomb (15), and the 193nm, 266nm, 632.8nm and 532nm lasers are combined. The combined laser passes through the third harmonic separator (16), the 193nm ultraviolet light passes through the first convex lens (17) and then passes through the first BPF (18), and is then received by the first CCD camera (19). The 266nm, 632.8nm and 532nm lasers pass through the fourth harmonic separator (16). The 266nm ultraviolet light passes through the second convex lens (21) and then through the second BPF (22), and is then received by the second CCD camera (23); the 632.8nm and 532nm lasers pass through the fifth harmonic separator (24), wherein the 532nm visible light passes through the fourth BPF (28) and is then received by the fourth CCD camera (29), while the 632.8nm visible light passes through the third convex lens (25) and then through the third BPF (26), and is then received by the third CCD camera (27).

9. The detection method of the liquid ammonia / diesel dual-fuel spray optical diagnostic device according to claim 8, characterized in that: The distribution of gas / liquid two-phase concentration of liquid ammonia / diesel dual-fuel spray when the diesel injector and liquid ammonia injector work at the same time is processed. The mixed image of gas and liquid phase of diesel is obtained by 266nm ultraviolet light, the liquid phase image of diesel and liquid ammonia is obtained by 632.8nm visible light, and the mixed image of gas and liquid phase of diesel and liquid ammonia is obtained by 193nm ultraviolet light; the liquid phase image of diesel is separated from the liquid phase image of diesel and liquid ammonia, and the liquid phase image of diesel is subtracted from the mixed image of gas and liquid phase of diesel to obtain the diesel gas phase image, and then the Bouguer-Lambert-Beer's law is used to obtain the diesel gas phase concentration distribution, and the diesel liquid phase mass is obtained by subtracting the diesel gas phase mass from the total diesel mass, thereby obtaining the diesel liquid phase concentration distribution.

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