CN104441659B - A kind of pulse laser ablation polymer momentum generation device and method - Google Patents
A kind of pulse laser ablation polymer momentum generation device and method Download PDFInfo
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Abstract
The invention discloses a kind of pulse laser ablation polymer momentum generation device and method.Pulse laser ablation polymer momentum generation device, comprise for pulsing laser beam pulse laser beam generating means, for place polymer to be ablated and accept the momentum produced in ablation process momentum receiving panel, for derive ablation resultant tubular exhaust section and cover polymer top to be ablated and for induced plasma in ablation process produce metallic netted structural; Momentum receiving panel is located at the bottom of tubular exhaust section, metallic netted structural is arranged in tubular exhaust section and/or momentum receiving panel and the polymer top to be ablated be covered in momentum receiving panel, gap is left between metallic netted structural and polymer to be ablated, there is end and arrange towards momentum receiving panel in the pulse laser beam of pulse laser beam generating means, the pulse laser beam that pulse laser beam generating means is launched passes metallic netted structural and acts on the polymer to be ablated in momentum receiving panel.
Description
Technical field
The present invention relates to the pulse laser ablation technical field of polymer, especially, relate to a kind of pulse laser ablation polymer momentum generation device.In addition, the invention still further relates to a kind of pulse laser ablation polymer momentum production method comprising above-mentioned pulse laser ablation polymer momentum generation device.
Background technology
Need in various engineering application scenario in vacuum environment, make pulse laser irradiation polymer produce momentum.While this application requires to produce larger momentum in this process, consume polymer quality as far as possible little, the quality utilization ratio (producing momentum and ablation mass ratio) that namely momentum produces maximizes.
At present, the thinking improving quality utilization ratio lays particular emphasis on improvement polymer itself, i.e. the metal dust of blended micrometer or nanoscale in the polymer, to utilizing the laser absorption degree of depth of the strong absorbability reduction polymer of metal pair laser.But experiment up to now shows, the method for simple doping metals powder transformation polymer itself, make polymer microscopical structure very uneven, produce the mass loss of a large amount of mechanical sapling under pulse laser irradiation, quality utilization ratio reduces on the contrary.
Summary of the invention
The invention provides a kind of pulse laser ablation polymer momentum generation device and method, polymer microscopical structure can be made very uneven with the method solving existing pulse laser ablation polymer raising quality utilization ratio, the mass loss of a large amount of mechanical sapling is produced, the technical problem that quality utilization ratio reduces on the contrary under pulse laser irradiation.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of pulse laser ablation polymer momentum generation device, comprise for pulsing laser beam pulse laser beam generating means, for place polymer to be ablated and accept the momentum produced in ablation process momentum receiving panel, for deriving the tubular exhaust section of ablation resultant and covering polymer top to be ablated and the metallic netted structural produced for induced plasma in ablation process; Momentum receiving panel is located at the bottom of tubular exhaust section, metallic netted structural is arranged in tubular exhaust section and/or momentum receiving panel and the polymer top to be ablated be covered in momentum receiving panel, gap is left between metallic netted structural and polymer to be ablated, there is end and arrange towards momentum receiving panel in the pulse laser beam of pulse laser beam generating means, the pulse laser beam that pulse laser beam generating means is launched passes metallic netted structural and acts on the polymer to be ablated in momentum receiving panel.
Further, metallic netted structural is by the internal face for regulating the height adjustment mechanism in gap between metallic netted structural and polymer to be ablated to be installed on tubular exhaust section or momentum receiving panel.
Further, the mesh aperture size of metallic netted structural is adjustable; Mesh aperture is regulated by the mode that surrounding stretches or metal screen resilience is replied from metallic netted structural; Or the mode that mesh aperture, by superimposed mesh, dislocation movement occurs mutually regulates; Or mesh aperture is regulated by the mode of the metallic netted structural changing different mesh aperture size.
Further, metallic netted structural is flat netted board or curved netting plate.
Further, momentum receiving panel and tubular exhaust section adopt overall integrated machine-shaping; Or momentum receiving panel and tubular exhaust section are assembled into one after adopting processing respectively.
Further, pulse laser beam generating means pulse laser beam occur end with polymer to be ablated between gap adjustable; Or the distance between the focus of the pulse laser beam of pulse laser beam generating means injection and polymer to be ablated is adjustable.
According to a further aspect in the invention, additionally provide a kind of pulse laser ablation polymer momentum production method, it comprises above-mentioned pulse laser ablation polymer momentum generation device; For the laser pulse shape of pulse laser beam, the course of work of paired pulses laser ablation of polymer momentum generation device carries out numerical simulation, in order to obtain the mesh aperture parameter of metallic netted structural and the gap parameter between metallic netted structural and polymer; According to the mesh aperture parameter obtained and gap parameter, metallic netted structural is set.Pulse laser beam ablate metals network structure generates high electron number densitiy product, high electron number densitiy product is for strengthening to the absorption of the pulse laser beam of incidence and for making metallic netted structural present position form high pressure, the motion of the input polymer ablation resultant of high electron number densitiy product retardance polymer ablation resultant plume porch, makes to form low speed heavy pressure region between the ablation face of metallic netted structural and polymer simultaneously; After stopping exports pulse laser beam, the high pressure in the low speed heavy pressure region formed between the high pressure utilizing the present position of metallic netted structural to be formed and the ablation face of metallic netted structural and polymer slows down the weak speed of the ablation face pressure of polymer, thus obtains efficient momentum performance and improve the quality utilization ratio in polymer ablation process.
Further, the course of work of paired pulses laser ablation of polymer momentum generation device is carried out numerical simulation and is comprised the following steps: step one, the initial parameter of the polymer ablation resultant plume that the initial parameter of setting polymeric inner and polymer ablation produce; Step 2, in each time step, obtains polymer ablation parameters and obtains polymer ablation resultant plume, the light intensity at the ablation face place of Real-time Obtaining polymer, dynamic pressure and static pressure; Step 3, repeats step 2, until terminate when terminating when ablation face pressure and environmental stress balance or reach the preset stopping time; Step 4, carries out time integral according to the dynamic pressure of ablation face and static pressure, obtains the momentum value produced, and obtains quality utilization ratio thus; Step 5, divide parameter level, carry out numerical experiment by the method for Orthogonal Experiment and Design, certain pulses laser beam condition can be obtained and be issued to the mesh aperture parameter of the metallic netted structural of high-quality utilization ratio and the gap parameter between metallic netted structural and polymer.
Further, in step 2, obtain polymer ablation parameters, comprise: at polymeric inner grid division, adopt heat transfer and Polymer-pyrolysis chemical kinetics equation, the change considering thermal decomposition product component and macroscopic property and the Trans-critical cycle temperature ablation therefore produced, obtain ablation mass loss and ablation resultant initial parameter; After calculating, export suction parameter to plume, comprise product component and state parameter, state parameter comprises pressure, density and speed.
Further, in step 2, obtain polymer ablation resultant plume, comprise: obtaining the flow region grid division of polymer ablation resultant plume, multicomponent Two Dimensional Unsteady hydrodynamics governing equation is adopted to carry out numerical simulation, wherein consider that the decay of laser in plume and the ablation resultant ionization caused thus and plasma develop, and according to the laser intensity because of arrival metallic netted structural place actual after the attenuation by absorption of ablation resultant plume, obtain the electron number densitiy inspired herein, thus the plume obtained under metallic netted structural intervention develops.
The present invention has following beneficial effect:
Pulse laser ablation polymer momentum generation device of the present invention, by adding metallic netted structural in momentum generation device, cover the top by irradiation polymerization thing, metal surface is utilized easily to produce the character inductive formation plasma of free electron, and the position of plasma and intensity have an impact to the follow-up ablation of polymer and plume development process, thus the time and space distribution regulating laser energy to deposit in polymer working medium and ablation resultant, reduce polymer ablation quality, reach the object controlling momentum and produce and improve quality utilization ratio.
Meanwhile, metallic netted structural is as a part for momentum generating means structure, and what avoid that prior art doping metals powder causes degrades problem, thus obtains higher momentum generation performance.
Pulse laser ablation polymer momentum generation device of the present invention, for obtaining accurate momentum.Can be applicable to the various occasion needing precise moment thrust in the fields such as Aero-Space, Industry Control, Laser Processing.
Except object described above, feature and advantage, the present invention also has other object, feature and advantage.Below with reference to figure, the present invention is further detailed explanation.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of the pulse laser ablation polymer momentum generation device of the preferred embodiment of the present invention;
Fig. 2 is the sectional view of Fig. 1;
Fig. 3 is metallic netted structural (t) schematic diagram of the course of work of changing in time under specific laser pulse condition (I) in the pulse laser ablation polymer momentum generation device of the preferred embodiment of the present invention;
Fig. 4 is the Numerical Simulation Results figure of typical flow fields of the laser ablation of polymer under the metallic netted structural of the preferred embodiment of the present invention regulates;
Fig. 5 is the aperture of the metallic netted structural of the preferred embodiment of the present invention and the graph of a relation of quality utilization ratio;
Fig. 6 is the graph of a relation that the metallic netted structural of the preferred embodiment of the present invention and gap, ablation face and quality utilization ratio change.Marginal data:
1, pulse laser beam generating means; 2, momentum receiving panel; 3, tubular exhaust section; 4, metallic netted structural; 5, polymer to be ablated.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail, but the present invention can by the multitude of different ways that limits and cover implement.
Fig. 1 is the structural representation of the pulse laser ablation polymer momentum generation device of the preferred embodiment of the present invention; Fig. 2 is the sectional view of Fig. 1; Fig. 3 is metallic netted structural (t) schematic diagram of the course of work of changing in time under specific laser pulse condition (I) in the pulse laser ablation polymer momentum generation device of the preferred embodiment of the present invention; Fig. 4 is the Numerical Simulation Results figure of typical flow fields of the laser ablation of polymer under the metallic netted structural of the preferred embodiment of the present invention regulates; Fig. 5 is the graph of a relation that the aperture of the metallic netted structural of the preferred embodiment of the present invention and quality utilization ratio change; Fig. 6 is the graph of a relation that the metallic netted structural of the preferred embodiment of the present invention and gap, ablation face and quality utilization ratio change.
As depicted in figs. 1 and 2, the pulse laser ablation polymer momentum generation device of the present embodiment, comprise for pulsing laser beam pulse laser beam generating means 1, for place polymer 5 to be ablated and accept the momentum produced in ablation process momentum receiving panel 2, for derive ablation resultant tubular exhaust section 3 and cover polymer 5 top to be ablated and for induced plasma in ablation process produce metallic netted structural 4; Momentum receiving panel 2 is located at the bottom of tubular exhaust section 3, metallic netted structural 4 is arranged in tubular exhaust section 3 and/or momentum receiving panel 2 and polymer to be ablated 5 top be covered in momentum receiving panel 2, gap h is left between metallic netted structural 4 and polymer to be ablated 5, there is end and arrange towards momentum receiving panel 2 in the pulse laser beam of pulse laser beam generating means 1, the pulse laser beam that pulse laser beam generating means 1 is launched passes metallic netted structural 4 and acts on the polymer to be ablated 5 in momentum receiving panel 2.Pulse laser beam generating means 1 bag pulse laser and beam shaping device.Beam shaping device is located at the transmitting terminal of pulse laser.Beam shaping device acts on the approximately parallel laser beam that laser instrument is launched, and produces the effects such as focusing, compression, to realize arriving the different light intensity in polymer surfaces place to be ablated.Beam shaping device can adopt set of lenses or speculum group to realize.Pulse laser ablation polymer momentum generation device of the present invention, by adding metallic netted structural in momentum generation device, cover the top by irradiation polymerization thing, metal surface is utilized easily to produce the character inductive formation plasma of free electron, and the position of plasma and intensity have an impact to the follow-up ablation of polymer and plume development process, thus the time and space distribution regulating laser energy to deposit in polymer working medium and ablation resultant, reduce polymer ablation quality, reach the object controlling momentum and produce and improve quality utilization ratio.Meanwhile, metallic netted structural is as a part for momentum generating means structure, and what avoid that prior art doping metals powder causes degrades problem, thus obtains higher momentum generation performance.Pulse laser ablation polymer momentum generation device of the present invention, for obtaining accurate momentum.Can be applicable to the various occasion needing precise moment thrust in the fields such as Aero-Space, Industry Control, Laser Processing.
As depicted in figs. 1 and 2, in the present embodiment, metallic netted structural 4 is by the internal face for regulating the height adjustment mechanism in gap between metallic netted structural 4 and polymer to be ablated 5 to be installed on tubular exhaust section 3 or momentum receiving panel 2.
As depicted in figs. 1 and 2, in the present embodiment, the mesh aperture d size of metallic netted structural 4 is adjustable.Mesh aperture d is regulated by the mode that surrounding stretches or metal screen resilience is replied from metallic netted structural 4.The mode that mesh aperture d, by superimposed mesh, dislocation movement occurs mutually regulates.Mesh aperture d is regulated by the mode of the metallic netted structural 4 changing different mesh aperture size.
As depicted in figs. 1 and 2, in the present embodiment, metallic netted structural 4 is flat netted board or curved netting plate.
As depicted in figs. 1 and 2, in the present embodiment, momentum receiving panel 2 and tubular exhaust section 3 adopt overall integrated machine-shaping.Momentum receiving panel 2 and tubular exhaust section 3 are assembled into one after adopting processing respectively.
As depicted in figs. 1 and 2, in the present embodiment, the gap h that the pulse laser beam of pulse laser beam generating means 1 occurs between end and polymer to be ablated 5 is adjustable.Distance between the focus of the pulse laser beam that pulse laser beam generating means 1 penetrates and polymer to be ablated 5 is adjustable.
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5 and Fig. 6, the pulse laser ablation polymer momentum production method of the present embodiment, adopts above-mentioned pulse laser ablation polymer momentum generation device; For the laser pulse shape of pulse laser beam, the course of work of paired pulses laser ablation of polymer momentum generation device carries out numerical simulation, in order to obtain the mesh aperture parameter of metallic netted structural 4 and the gap parameter between metallic netted structural 4 and polymer; According to the mesh aperture parameter obtained and gap parameter, metallic netted structural 4 is set.Pulse laser beam ablate metals network structure 4 generates high electron number densitiy product, high electron number densitiy product is for strengthening to the absorption of the pulse laser beam of incidence and for making metallic netted structural 4 present position form high pressure, the motion of the input polymer ablation resultant of high electron number densitiy product retardance polymer ablation resultant plume porch, makes to form low speed heavy pressure region between metallic netted structural 4 and the ablation face of polymer simultaneously; After stopping exports pulse laser beam, the high pressure utilizing the present position of metallic netted structural 4 to be formed and the high pressure in low speed heavy pressure region formed between metallic netted structural 4 and the ablation face of polymer slow down the weak speed of the ablation face pressure of polymer, thus obtain efficient momentum performance and improve the quality utilization ratio in polymer ablation process.
As shown in Figure 1, Figure 2, shown in Fig. 4, Fig. 5 and Fig. 6, in the present embodiment, the course of work of paired pulses laser ablation of polymer momentum generation device is carried out numerical simulation and is comprised the following steps: step one, the initial parameter of the polymer ablation resultant plume that the initial parameter of setting polymeric inner and polymer ablation produce; Step 2, in each time step, obtains polymer ablation parameters and obtains polymer ablation resultant plume, the light intensity at the ablation face place of Real-time Obtaining polymer, dynamic pressure and static pressure; Step 3, repeats step 2, until terminate when terminating when ablation face pressure and environmental stress balance or reach the preset stopping time; Step 4, carries out time integral according to the dynamic pressure of ablation face and static pressure, obtains the momentum value produced, and obtains quality utilization ratio thus; Step 5, divide parameter level, carry out numerical experiment by the method for Orthogonal Experiment and Design, certain pulses laser beam condition can be obtained and be issued to the mesh aperture parameter of the metallic netted structural 4 of high-quality utilization ratio and the gap parameter between metallic netted structural 4 and polymer.
In the present embodiment, in step 2, obtain polymer ablation parameters, comprise: at polymeric inner grid division, adopt heat transfer and Polymer-pyrolysis chemical kinetics equation, the change considering thermal decomposition product component and macroscopic property and the Trans-critical cycle temperature ablation therefore produced, obtain ablation mass loss and ablation resultant initial parameter; After calculating, export suction parameter to plume, comprise product component and state parameter, state parameter comprises pressure, density and speed.
In the present embodiment, in step 2, obtain polymer ablation resultant plume, comprise: obtaining the flow region grid division of polymer ablation resultant plume, multicomponent Two Dimensional Unsteady hydrodynamics governing equation is adopted to carry out numerical simulation, wherein consider that the decay of laser in plume and the ablation resultant ionization caused thus and plasma develop, and according to the laser intensity because of arrival metallic netted structural 4 place actual after the attenuation by absorption of ablation resultant plume, obtain the electron number densitiy inspired herein, thus the plume obtained under metallic netted structural 4 intervention develops.
In the present embodiment, compare with polymer, the little order of magnitude of momentum of metallic netted structural ablation resultant.When can think that metallic netted structural ablation resultant and polymer ablation resultant interact, metallic netted structural ablation resultant is on the momentum of polymer product without impact, and metallic netted structural ablation resultant spreads in polymer ablation resultant.As shown in Figure 3, comprise with the next stage: as shown in Fig. 3 (a), in the stage one, laser irradiation starts the course of work of pulse laser ablation polymer under metallic netted structural 4 participates in; As shown in Fig. 3 (b), in the stage two, there is ablation respectively and disperse respectively polymer ablation resultant and ablation of metals product in polymer and metallic netted structural 4, without interacting between polymer ablation resultant and ablation of metals product; As shown in Fig. 3 (c), stage three, polymer ablation resultant arrives metallic netted structural 4 present position, and ablation of metals product mixes mutually, and because polymer ablation resultant plume momentum is much larger than ablation of metals product plume momentum, polymer ablation resultant plume sweeps along ablation of metals product plume to continue to disperse; As shown in Fig. 3 (d), stage four, metallic netted structural 4 is wrapped up by polymer ablation resultant plume, the high electron number densitiy product that ablation of metals produces is distributed in metallic netted structural 4 surface and polymer ablation resultant rapid temperature increases near induction, dissociation and ionization, form plasma; As shown in Fig. 3 (e), in the stage five, the high temperature around metallic netted structural 4, high pressure plasma expand towards periphery, and continue to absorb incident laser energy, and the heating region that plasma is formed is developed in face of laser incident direction; Due to the shielding action of plasma, the laser energy arriving metallic netted structural 4 surface reduces, and the Recession rate of metallic netted structural 4 slows down; As shown in Fig. 3 (f), in the stage six, after laser pulse extinguishes, plasma around metallic netted structural 4 continues to expand toward surrounding, and collides with polymer ablation face and reflect; As shown in Fig. 3 (g), the stage seven, plasma extinguishment, polymer ablation resultant plume continues to disperse to vacuum; As shown in Fig. 3 (h), in the stage eight, pulse laser ablation polymer momentum generation device returns to original state.
In the present embodiment, during stage four and stage five, the high electron number densitiy product that metallic netted structural 4 ablation produces increases the electron number densitiy of polymer ablation resultant near it, the deposition of incident laser energy in polymer product is obviously increased, cause polymer product to ionize rapidly, form plasma.High temperature, high pressure plasma shield incident laser on the one hand, affect the follow-up ablation of metallic netted structural and polymer, change the VELOCITY DISTRIBUTION of ablation resultant on the other hand, and then affect momentum occurrence features.
During enforcement, by adding metallic netted structural in momentum generation device, the time and space distribution that can deposit in polymer working medium and working medium ablation resultant laser energy adjusts, and reduces polymer ablation quality, improves the quality utilization ratio of momentum generation device.Principle device in laboratory demonstrates above-mentioned characteristic and advantage.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a pulse laser ablation polymer momentum generation device, is characterized in that,
Comprise for pulsing laser beam pulse laser beam generating means (1), for place polymer to be ablated (5) and accept the momentum produced in ablation process momentum receiving panel (2), for derive ablation resultant tubular exhaust section (3) and cover described polymer to be ablated (5) top and for induced plasma in ablation process produce metallic netted structural (4);
Described momentum receiving panel (2) is located at the bottom of described tubular exhaust section (3),
Described metallic netted structural (4) is arranged on described tubular exhaust section (3) and/or described momentum receiving panel (2) goes up and is covered in polymer described to be ablated (5) top on described momentum receiving panel (2)
Gap is left between described metallic netted structural (4) and described polymer to be ablated (5),
There is end and arrange towards described momentum receiving panel (2) in the pulse laser beam of described pulse laser beam generating means (1),
The pulse laser beam that described pulse laser beam generating means (1) is launched passes described metallic netted structural (4) and acts on the polymer described to be ablated (5) on described momentum receiving panel (2).
2. pulse laser ablation polymer momentum generation device according to claim 1, it is characterized in that, described metallic netted structural (4) is by the internal face for regulating the height adjustment mechanism in gap between described metallic netted structural (4) and described polymer to be ablated (5) to be installed on described tubular exhaust section (3) or described momentum receiving panel (2).
3. pulse laser ablation polymer momentum generation device according to claim 1, is characterized in that,
The mesh aperture size of described metallic netted structural (4) is adjustable;
Described mesh aperture is regulated by the mode that surrounding stretches or metal screen resilience is replied from described metallic netted structural (4); Or
The mode that described mesh aperture, by superimposed mesh, dislocation movement occurs mutually regulates; Or
Described mesh aperture is regulated by the mode of the described metallic netted structural (4) changing different mesh aperture size.
4. pulse laser ablation polymer momentum generation device according to claim 1, is characterized in that, described metallic netted structural (4) is flat netted board or curved netting plate.
5. pulse laser ablation polymer momentum generation device according to any one of claim 1 to 4, is characterized in that,
Described momentum receiving panel (2) and described tubular exhaust section (3) adopt overall integrated machine-shaping; Or
Described momentum receiving panel (2) and described tubular exhaust section (3) are assembled into one after adopting processing respectively.
6. pulse laser ablation polymer momentum generation device according to any one of claim 1 to 4, is characterized in that,
The gap that the pulse laser beam of described pulse laser beam generating means (1) occurs between end and described polymer to be ablated (5) is adjustable; Or
Distance between the focus of the pulse laser beam that described pulse laser beam generating means (1) is penetrated and described polymer to be ablated (5) is adjustable.
7. a pulse laser ablation polymer momentum production method, is characterized in that,
Adopt the pulse laser ablation polymer momentum generation device according to any one of claim 1 to 6;
For the laser pulse shape of pulse laser beam, numerical simulation is carried out to the course of work of described pulse laser ablation polymer momentum generation device, in order to obtain the mesh aperture parameter of metallic netted structural (4) and the gap parameter between metallic netted structural (4) and polymer;
According to the described mesh aperture parameter obtained and described gap parameter, described metallic netted structural (4) is set;
Described in pulse laser beam ablation, metallic netted structural (4) generates high electron number densitiy product, described high electron number densitiy product is for strengthening to the absorption of the described pulse laser beam of incidence and for making described metallic netted structural (4) present position form high pressure, the motion of the input polymer ablation resultant of described high electron number densitiy product retardance polymer ablation resultant plume porch, makes to form low speed heavy pressure region between described metallic netted structural (4) and the ablation face of polymer simultaneously;
After stopping exports pulse laser beam, the high pressure utilizing the present position of described metallic netted structural (4) to be formed and the high pressure in low speed heavy pressure region formed between described metallic netted structural (4) and the ablation face of described polymer slow down the weak speed of the ablation face pressure of polymer, thus obtain efficient momentum performance and improve the quality utilization ratio in polymer ablation process.
8. pulse laser ablation polymer momentum production method according to claim 7, is characterized in that,
The course of work of paired pulses laser ablation of polymer momentum generation device is carried out numerical simulation and is comprised the following steps:
Step one, the initial parameter of the polymer ablation resultant plume that the initial parameter of setting polymeric inner and polymer ablation produce;
Step 2, in each time step, obtains polymer ablation parameters and obtains polymer ablation resultant plume, the light intensity at the ablation face place of Real-time Obtaining polymer, dynamic pressure and static pressure;
Step 3, repeats step 2, until terminate when terminating when ablation face pressure and environmental stress balance or reach the preset stopping time;
Step 4, carries out time integral according to the dynamic pressure of ablation face and static pressure, obtains the momentum value produced, and obtains quality utilization ratio thus;
Step 5, divide parameter level, carry out numerical experiment by the method for Orthogonal Experiment and Design, certain pulses laser beam condition can be obtained and be issued to the mesh aperture parameter of the metallic netted structural (4) of high-quality utilization ratio and the gap parameter between metallic netted structural (4) and polymer.
9. pulse laser ablation polymer momentum production method according to claim 8, is characterized in that,
In described step 2, obtain polymer ablation parameters, comprising:
At polymeric inner grid division, adopt heat transfer and Polymer-pyrolysis chemical kinetics equation, the change considering thermal decomposition product component and macroscopic property and the Trans-critical cycle temperature ablation therefore produced, obtain ablation mass loss and ablation resultant initial parameter;
After calculating, export suction parameter to plume, comprise product component and state parameter, state parameter comprises pressure, density and speed.
10. pulse laser ablation polymer momentum production method according to claim 8, is characterized in that,
In described step 2, obtain polymer ablation resultant plume, comprising:
Obtaining the flow region grid division of polymer ablation resultant plume, multicomponent Two Dimensional Unsteady hydrodynamics governing equation is adopted to carry out numerical simulation, wherein consider that the decay of laser in plume and the ablation resultant ionization caused thus and plasma develop, and according to the laser intensity because of arrival metallic netted structural (4) place actual after the attenuation by absorption of ablation resultant plume, obtain the electron number densitiy inspired herein, thus the plume obtained under metallic netted structural (4) intervention develops.
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| US11478853B2 (en) * | 2016-12-23 | 2022-10-25 | General Electric Company | Method for emissions plume monitoring in additive manufacturing |
| CN113252646B (en) * | 2021-06-16 | 2023-01-31 | 中国人民解放军战略支援部队航天工程大学 | Method and device for judging ablation impulse by using laser ablation plasma emission spectrum information |
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| CN1090803A (en) * | 1992-09-29 | 1994-08-17 | 博士伦有限公司 | Scanning technique for laser ablation |
| CN102325626A (en) * | 2009-03-09 | 2012-01-18 | Imra美国公司 | Pulsed laser micro-deposition pattern formation |
| CN102513431A (en) * | 2011-12-06 | 2012-06-27 | 江苏大学 | Laser shock high molecular polymer indirect micro-forming method and dedicated device thereof |
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| CN1090803A (en) * | 1992-09-29 | 1994-08-17 | 博士伦有限公司 | Scanning technique for laser ablation |
| CN102325626A (en) * | 2009-03-09 | 2012-01-18 | Imra美国公司 | Pulsed laser micro-deposition pattern formation |
| CN102513431A (en) * | 2011-12-06 | 2012-06-27 | 江苏大学 | Laser shock high molecular polymer indirect micro-forming method and dedicated device thereof |
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