CN117829018A - Method and system for improving cold spray simulation result based on hot spray effect - Google Patents
Method and system for improving cold spray simulation result based on hot spray effect Download PDFInfo
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- CN117829018A CN117829018A CN202311797782.1A CN202311797782A CN117829018A CN 117829018 A CN117829018 A CN 117829018A CN 202311797782 A CN202311797782 A CN 202311797782A CN 117829018 A CN117829018 A CN 117829018A
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- 238000007751 thermal spraying Methods 0.000 claims abstract description 83
- 238000010288 cold spraying Methods 0.000 claims abstract description 75
- 238000012937 correction Methods 0.000 claims abstract description 55
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Abstract
The embodiment of the specification provides a method and a system for improving a cold spray simulation result based on a hot spray effect, wherein the method comprises the following steps: calculating to obtain a relational expression of thermal spraying and cold spraying sensitive parameters according to the difference of the thermal spraying and cold spraying interference characteristics; determining a pneumatic disturbance load correction factor according to the relation between the hot spraying and cold spraying sensitive parameters, and improving a cold spraying simulation result according to the pneumatic disturbance load correction factor; the embodiment of the invention provides a correction method for a whirling body lateral jet flow interference thermal spray effect, which establishes an association relation between an interference range and simulation parameters, corrects a cold spray simulation result based on the association relation, reduces the difference between the cold jet flow simulation result and the hot jet flow simulation result, and solves the problem that the cold spray simulation result cannot reflect the influence of the thermal spray effect.
Description
Technical Field
The present document relates to the field of computational fluid dynamics, and in particular, to a method and system for improving a cold spray simulation result based on a hot spray effect.
Background
The Reaction Control System (RCS) is a direct force control system for quickly changing the attitude or orbit of an aircraft by utilizing the side-mounted engine jet flow to generate reaction force, and has the advantages of supplementing the insufficient efficiency of a pneumatic control surface and quickly changing the flight state.
The RCS engine is usually a gas engine, the actual gas jet flow gas is high-temperature mixed gas comprising multiple components with different thermodynamic characteristics, mass, momentum and energy are transported and exchanged between the gas components, when the jet flow is mixed with outflow air, secondary combustion can occur when the jet flow product which is not completely combusted encounters outflow air, meanwhile, complex physical phenomena such as multiphase flow interference and the like exist in an interference flow field, the jet flow interference flow mechanism is more complex due to the thermal jet interference effect of the jet flow, and the thermal jet wind tunnel experimental method and the numerical simulation technology are not mature, so that the cold jet simulation technology is mostly adopted in research, namely, the gas jet is converted into complete gas (cold jet) for simulation under the condition of meeting a limited number of similar parameters, the actual gas jet flow medium characteristics, the chemical unbalanced flow effect of secondary combustion, the two-phase flow effect and the like cannot be simulated, and the obtained jet flow interference aerodynamic/thermal characteristic prediction result is different from the actual flight, and the flight control accuracy can be seriously influenced (the problem of control failure is most probably caused), and how to consider the thermal jet effect is a great problem faced by engineering design.
Disclosure of Invention
The invention aims to provide a method and a system for improving a cold spray simulation result based on a hot spray effect, and aims to solve the problems in the prior art.
The embodiment of the invention provides a method for improving a cold spray simulation result based on a hot spray effect, which comprises the following steps:
calculating to obtain a relational expression of thermal spraying and cold spraying sensitive parameters according to the difference of the thermal spraying and cold spraying interference characteristics;
and determining a pneumatic disturbance load correction factor according to a relation between the hot spraying and cold spraying sensitive parameters, and improving a cold spraying simulation result according to the pneumatic disturbance load correction factor.
The embodiment of the invention provides a system for improving a cold spray simulation result based on a hot spray effect, which comprises the following steps:
the calculation module is used for calculating and obtaining a relational expression of the thermal spraying and cold spraying sensitive parameters according to the difference of the thermal spraying and cold spraying interference characteristics;
and the improvement module is used for determining a pneumatic disturbance load correction factor according to the relation between the hot spraying and cold spraying sensitive parameters and improving a cold spraying simulation result according to the pneumatic disturbance load correction factor.
The embodiment of the invention also provides electronic equipment, which comprises: a memory, a processor and a computer program stored on the memory and executable on the processor, which when executed by the processor, performs the steps of the above method of improving cold spray simulation results based on the hot spray effect.
The embodiment of the invention also provides a computer readable storage medium, wherein an information transmission implementation program is stored on the computer readable storage medium, and the program is executed by a processor to realize the steps of the method for improving the cold spray simulation result based on the hot spray effect.
The embodiment of the invention can have the following beneficial effects: the embodiment of the invention provides a correction method for a whirling body lateral jet flow interference thermal spray effect, which establishes an association relation between an interference range and simulation parameters, corrects a cold spray simulation result based on the association relation, reduces the difference between the cold jet flow simulation result and the hot jet flow simulation result, and solves the problem that the cold spray simulation result cannot reflect the influence of the thermal spray effect.
Drawings
For a clearer description of one or more embodiments of the present description or of the solutions of the prior art, the drawings that are necessary for the description of the embodiments or of the prior art will be briefly described, it being apparent that the drawings in the description that follow are only some of the embodiments described in the description, from which, for a person skilled in the art, other drawings can be obtained without inventive faculty.
FIG. 1 is a flow chart of a method for improving cold spray simulation results based on thermal spray effects in accordance with an embodiment of the present invention;
FIG. 2 is a schematic illustration of a spin-formed body with lateral jets according to an embodiment of the present invention;
FIG. 3 is a graph comparing the amount of cold and hot air dynamic coefficient disturbances before and after correction in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of a system for improving cold spray simulation results based on thermal spray effects in accordance with an embodiment of the present invention.
Detailed Description
In order to enable a person skilled in the art to better understand the technical solutions in one or more embodiments of the present specification, the technical solutions in one or more embodiments of the present specification will be clearly and completely described below with reference to the drawings in one or more embodiments of the present specification, and it is obvious that the described embodiments are only some embodiments of the present specification, not all embodiments. All other embodiments, which can be made by one or more embodiments of the present disclosure without inventive faculty, are intended to be within the scope of the present disclosure.
Method embodiment
According to an embodiment of the present invention, a method for improving a cold spray simulation result based on a thermal spray effect is provided, and fig. 1 is a flowchart of a method for improving a cold spray simulation result based on a thermal spray effect according to an embodiment of the present invention, as shown in fig. 1, the method for improving a cold spray simulation result based on a thermal spray effect according to an embodiment of the present invention specifically includes:
step S101, calculating a relation between thermal spraying and cold spraying sensitive parameters according to the difference between thermal spraying and cold spraying interference characteristics, wherein the relation specifically comprises the following steps:
according to the difference of the thermal spraying and cold spraying interference characteristics, calculating to obtain a relational expression of thermal spraying and cold spraying sensitive parameters through a formula 1;
wherein f Thermal spraying Is a sensitive parameter of thermal spraying, area Thermal spraying Interference space size for thermal spraying, L Thermal spraying For the interference length of thermal spraying, S Thermal spraying Area of interference zone for thermal spraying, f Cold spray Is a sensitive parameter of cold spraying, area Cold spray The size of the interference space for cold spraying, L Cold spray For the interference length of cold spraying, S Cold spray The area of the interference area is cold spraying;
the sensitive parameter is jet outlet mass flow rate;
step S102, determining a pneumatic disturbance load correction factor according to a relation between the thermal spraying and the cold spraying sensitive parameters, and improving a cold spraying simulation result according to the pneumatic disturbance load correction factor, wherein the method specifically comprises the following steps:
determining a pneumatic disturbance load correction factor according to a formula 2 through the relation between the hot spraying and cold spraying sensitive parameters, and improving a cold spraying simulation result by adopting a formula 3 according to the pneumatic disturbance load correction factor;
wherein k is a pneumatic disturbance load correction factor, S Thermal spraying Is the area of an interference area of thermal spraying, S Cold spray Area of interference zone for cold spraying, f Thermal spraying Is a sensitive parameter of thermal spraying, f Cold spray Is a sensitive parameter of cold spraying;
ΔCi correction ＝k*ΔCi Cold spray Equation 3;
where k is the aerodynamic disturbance load correction factor, ΔCi Correction For the corrected air-coefficient cold spray disturbance variable, ΔCi Cold spray The disturbance variable of the cold spray jet is a pneumatic coefficient, and i represents six components.
The above technical solutions of the embodiments of the present invention are described in detail below with reference to specific cases of the method for improving a cold spray simulation result based on a hot spray effect according to the embodiments of the present invention.
a) The whole interference area is assumed to be uniformly distributed in the direction of the rotating body flow, the direction of the expanding direction and the normal direction according to the characteristic interference length L, namely the space size of the whole interference area is as follows:
Area＝L 3
b) Let the area of the surface interference area be S, the surface interference area is determined by the flow direction and the spreading characteristic interference length (L)
S＝L 2 ＝Area 2/3
c) The difference between the hot and cold spray interference characteristics is mainly reflected in the difference in the size of the whole interference area, and this difference is determined by a certain sensitive parameter f, assuming that:
Area thermal spraying /Area Cold spray ＝f Thermal spraying /f Cold spray
Then, the relation between the surface interference area S and the sensitive parameter is as follows:
S thermal spraying /S Cold spray ＝(Area Thermal spraying /Area Cold spray ) 2/3 ＝(f Thermal spraying /f Cold spray ) 2/3
d) The difference in the sizes of the hot spray and cold spray surface disturbance areas determines the difference in the hot spray and cold spray dynamic disturbance loads, and therefore the dynamic disturbance load correction factor k is determined as follows:
k＝S thermal spraying /S Cold spray ＝(f Thermal spraying /f Cold spray ) 2/3
e) Correcting the cold spraying result based on the pneumatic disturbance load correction factor k:
ΔCi correction ＝k*ΔCi Cold spray
Where Δci represents the jet disturbance variable of the aerodynamic coefficient, and i represents the six components.
The specific implementation flow of the embodiment of the invention is as follows:
(1) Performing cold spraying simulation parameter analysis to determine sensitive parameters;
the most common cold spray simulation parameters of engineering are jet outlet pressure and jet outlet momentum, namely, the jet outlet pressure and jet outlet momentum are guaranteed to be the same as those of the hot spray simulation during cold spray simulation, in addition, the jet outlet temperature and jet outlet gas constant are mainly different in the cold spray and hot spray simulation parameters, and are related to the jet outlet mass flow rate, so that the jet outlet mass flow rate is used as a sensitive parameter;
(2) Calculating the sum of cold spraying and hot spraying sensitive parameter values respectively;
(3) Calculating a pneumatic disturbance load correction factor by the sensitive parameters;
(4) Correcting the cold jet coefficient disturbance variable based on the pneumatic disturbance load correction factor;
(5) And (3) finishing.
In the embodiment of the invention, a spin-formed body shape shown in fig. 2 is selected to respectively perform lateral jet flow interference cold jet flow calculation and thermal jet flow calculation, cold jet flow calculation results and thermal jet flow calculation results are obtained based on cold jet flow parameters and thermal jet flow parameters shown in table 1, the incoming flow Mach number is 8, the attack angle and the sideslip angle are 0 degree, and the flying height comprises four conditions of 20km, 25km, 30km and 35 km.
The correction factor k= 0.379911 is calculated from the mass flow rates of the cold spray and the hot spray, and the cold spray result is corrected, and fig. 3 shows a comparison chart of the disturbance variable of the cold spray coefficient and the disturbance variable of the hot spray coefficient before and after correction, and it can be seen that the difference between the cold spray result and the hot spray result before correction is larger, and the difference between the corrected cold spray result and the hot spray result is obviously reduced.
TABLE 1 jet outlet parameter table
In summary, the embodiment of the invention provides a correction method for interference thermal spraying effect of a spiral body lateral jet, which establishes an association relation between an interference range and simulation parameters according to the difference between the characteristics of a lateral jet interference cold spraying simulation and a thermal spraying simulation flow field, corrects a cold spraying simulation result based on the association relation, reduces the difference between the cold jet simulation result and the thermal jet simulation result, and further improves the reliability of the cold spraying simulation result.
System embodiment
According to an embodiment of the present invention, a system for improving a cold spray simulation result based on a thermal spray effect is provided, and fig. 4 is a schematic diagram of a system for improving a cold spray simulation result based on a thermal spray effect according to an embodiment of the present invention, as shown in fig. 4, where the system for improving a cold spray simulation result based on a thermal spray effect according to an embodiment of the present invention specifically includes:
the calculating module 40 is configured to calculate a relation between the thermal spraying and the cold spraying sensitivity parameter according to the difference between the thermal spraying and the cold spraying interference characteristics, and is specifically configured to:
according to the difference of the thermal spraying and cold spraying interference characteristics, calculating to obtain a relational expression of thermal spraying and cold spraying sensitive parameters through a formula 1;
wherein f Thermal spraying Is a sensitive parameter of thermal spraying, area Thermal spraying Interference space size for thermal spraying, L Thermal spraying For the interference length of thermal spraying, S Thermal spraying Area of interference zone for thermal spraying, f Cold spray Is a sensitive parameter of cold spraying, area Cold spray The size of the interference space for cold spraying, L Cold spray For the interference length of cold spraying, S Cold spray The area of the interference area is cold spraying;
the sensitive parameter is jet outlet mass flow rate;
the improvement module 42 is configured to determine a aerodynamic disturbance load correction factor according to the relation between the thermal spraying and the cold spraying sensitivity parameter, and improve a cold spraying simulation result according to the aerodynamic disturbance load correction factor, and specifically is configured to:
determining a pneumatic disturbance load correction factor according to a formula 2 through the relation between the hot spraying and cold spraying sensitive parameters, and improving a cold spraying simulation result by adopting a formula 3 according to the pneumatic disturbance load correction factor;
wherein k is a pneumatic disturbance loadCorrection factor, S Thermal spraying Is the area of an interference area of thermal spraying, S Cold spray Area of interference zone for cold spraying, f Thermal spraying Is a sensitive parameter of thermal spraying, f Cold spray Is a sensitive parameter of cold spraying;
ΔCi correction ＝k*ΔCi Cold spray Equation 3;
where k is the aerodynamic disturbance load correction factor, ΔCi Correction For the corrected air-coefficient cold spray disturbance variable, ΔCi Cold spray The disturbance variable of the cold spray jet is a pneumatic coefficient, and i represents six components.
The embodiment of the present invention is a system embodiment corresponding to the above method embodiment, and specific operations of each module may be understood by referring to the description of the method embodiment, which is not repeated herein.
In summary, the embodiment of the invention provides a method for correcting the influence of the thermal spraying effect based on the cold spraying simulation result based on the difference characteristics of the lateral spraying interference cold spraying simulation result and the thermal spraying simulation result and combining the flow mechanism analysis, thereby further improving the reliability of the cold spraying simulation result; based on jet flow interference flow field characteristics and cold spray simulation similar parameter selection, reasonable assumption is adopted, the interference flow field interference range is quantized, an association relation is established with sensitive parameters, and based on the association relation, thermal spray effect correction is carried out on the basis of a cold spray simulation result, so that the difference between the cold spray simulation result and the thermal spray simulation result is reduced, and the reliability of the cold spray simulation result is further improved, so that the embodiment of the invention has the following beneficial effects:
1. starting from the difference of flow characteristics, the correction method establishes a connection with the difference of pneumatic load based on sensitive parameters, has definite physical meaning and is reasonable in assumption;
2. the correction method is simple and convenient, and the thermal spray effect influence correction can be realized by simple data processing based on the cold spray simulation result, so that the method has stronger engineering application value.
Device embodiment 1
An embodiment of the present invention provides an electronic device, including: a memory, a processor and a computer program stored on the memory and executable on the process, which when executed by the processor performs the steps as described in the method embodiments.
Device example two
Embodiments of the present invention provide a computer-readable storage medium having stored thereon a program for realizing information transmission, which when executed by a processor realizes the steps as described in the method embodiments.
The computer readable storage medium of the present embodiment includes, but is not limited to: ROM, RAM, magnetic or optical disks, etc.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. A method for improving cold spray simulation results based on a hot spray effect, comprising:
calculating to obtain a relational expression of thermal spraying and cold spraying sensitive parameters according to the difference of the thermal spraying and cold spraying interference characteristics;
and determining a pneumatic disturbance load correction factor according to a relation between the hot spraying and cold spraying sensitive parameters, and improving a cold spraying simulation result according to the pneumatic disturbance load correction factor.
2. The method according to claim 1, wherein the calculating the relation between the thermal spray and the cold spray sensitivity parameter according to the difference between the thermal spray and the cold spray interference characteristics specifically comprises:
according to the difference of the thermal spraying and cold spraying interference characteristics, calculating to obtain a relational expression of thermal spraying and cold spraying sensitive parameters through a formula 1;
wherein f Thermal spraying Is a sensitive parameter of thermal spraying, area Thermal spraying Interference space size for thermal spraying, L Thermal spraying For the interference length of thermal spraying, S Thermal spraying Area of interference zone for thermal spraying, f Cold spray Is a sensitive parameter of cold spraying, area Cold spray The size of the interference space for cold spraying, L Cold spray For the interference length of cold spraying, S Cold spray Is the area of the interference area of the cold spray.
3. The method according to claim 1, wherein the determining the aerodynamic disturbance load correction factor by the relation between the thermal spray and the cold spray sensitivity parameter, and the improving the cold spray simulation result according to the aerodynamic disturbance load correction factor specifically comprises:
determining a pneumatic disturbance load correction factor according to a formula 2 through the relation between the hot spraying and cold spraying sensitive parameters, and improving a cold spraying simulation result by adopting a formula 3 according to the pneumatic disturbance load correction factor;
wherein k is a pneumatic disturbance load correction factor, S Thermal spraying Is the area of an interference area of thermal spraying, S Cold spray Area of interference zone for cold spraying, f Thermal spraying Is a sensitive parameter of thermal spraying, f Cold spray Is a sensitive parameter of cold spraying;
ΔCi correction ＝k*ΔCi Cold spray Equation 3;
where k is the aerodynamic disturbance load correction factor, ΔCi Correction For the corrected air-coefficient cold spray disturbance variable, ΔCi Cold spray The disturbance variable of the cold spray jet is a pneumatic coefficient, and i represents six components.
4. The method of claim 1, wherein the sensitive parameter is jet outlet mass flow rate.
5. A system for improving cold spray simulation results based on a hot spray effect, comprising:
the calculation module is used for calculating and obtaining a relational expression of the thermal spraying and cold spraying sensitive parameters according to the difference of the thermal spraying and cold spraying interference characteristics;
and the improvement module is used for determining a pneumatic disturbance load correction factor according to the relation between the hot spraying and cold spraying sensitive parameters and improving a cold spraying simulation result according to the pneumatic disturbance load correction factor.
6. The system of claim 5, wherein the computing module is specifically configured to:
according to the difference of the thermal spraying and cold spraying interference characteristics, calculating to obtain a relational expression of thermal spraying and cold spraying sensitive parameters through a formula 1;
wherein f Thermal spraying Is a sensitive parameter of thermal spraying, area Thermal spraying Interference space size for thermal spraying, L Thermal spraying For the interference length of thermal spraying, S Thermal spraying Area of interference zone for thermal spraying, f Cold spray Is a sensitive parameter of cold spraying, area Cold spray The size of the interference space for cold spraying, L Cold spray For the interference length of cold spraying, S Cold spray Is the area of the interference area of the cold spray.
7. The system of claim 5, wherein the improvement module is specifically configured to:
determining a pneumatic disturbance load correction factor according to a formula 2 through the relation between the hot spraying and cold spraying sensitive parameters, and improving a cold spraying simulation result by adopting a formula 3 according to the pneumatic disturbance load correction factor;
wherein k is a pneumatic disturbance load correction factor, S Thermal spraying Is the area of an interference area of thermal spraying, S Cold spray Area of interference zone for cold spraying, f Thermal spraying Is a sensitive parameter of thermal spraying, f Cold spray Is a sensitive parameter of cold spraying;
ΔCi correction ＝k*ΔCi Cold spray Equation 3;
where k is the aerodynamic disturbance load correction factor, ΔCi Correction For the corrected air-coefficient cold spray disturbance variable, ΔCi Cold spray The disturbance variable of the cold spray jet is a pneumatic coefficient, and i represents six components.
8. The system of claim 5, wherein the sensitive parameter is jet outlet mass flow rate.
9. An electronic device, comprising: memory, a processor and a computer program stored on the memory and executable on the processor, which when executed by the processor realizes the steps of the method of improving cold spray simulation results based on the hot spray effect as claimed in claims 1-4.
10. A computer-readable storage medium, characterized in that it has stored thereon a program for realizing information transfer, which program, when being executed by a processor, realizes the steps of the method for improving cold spray simulation results based on the hot spray effect as claimed in claims 1-4.
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| CN202311797782.1A CN117829018A (en) | 2023-12-25 | 2023-12-25 | Method and system for improving cold spray simulation result based on hot spray effect |
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| CN202311797782.1A CN117829018A (en) | 2023-12-25 | 2023-12-25 | Method and system for improving cold spray simulation result based on hot spray effect |
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