CN-115730477-B - Ship exhaust device infrared characteristic simulation method, device and equipment

CN115730477BCN 115730477 BCN115730477 BCN 115730477BCN-115730477-B

Abstract

The application discloses a ship exhaust device infrared characteristic simulation method, which can improve the running speed of infrared radiation data simulation result production, greatly reduce the time complexity, gradually refine the application layer by layer, improve the detection efficiency, and solve the problems of high computer memory consumption, high computer overhead, reduced precision after model simplification and calculation errors introduced by the difference of orders of magnitude in the process of mapping flow field parameters to infrared grids.

Inventors

ZhuanSun Xiaobo
ZHANG YANGYANG
XU FEI
CHEN ZHONGWEI
MA XIAO
ZHANG SHUAI
NI JIAZHENG
SUO JUN
TANG XINGJI
TANG SIMI
LI XIBIN

Assignees

中国人民解放军92942部队

Dates

Publication Date: 20260512
Application Date: 20221021

Claims (10)

1. The infrared characteristic simulation method of the ship exhaust device is characterized by comprising the following steps of: acquiring a three-dimensional model of a smoke plume field of an exhaust device of a target ship; According to the temperature field distribution condition of the exhaust device, carrying out grid division on the three-dimensional model to obtain a plurality of model grids, and determining infrared radiation data of each model grid; generating a hierarchical bounding box corresponding to each model grid aiming at each model grid; Determining the infrared ray paths of the background area according to the infrared ray paths of the hierarchical bounding boxes corresponding to all the model grids; generating an infrared radiation data simulation result of the exhaust device of the target ship according to the infrared radiation data of each model grid and the infrared ray path of the background area; The step of conducting mesh division on the three-dimensional model according to the temperature field distribution condition of the exhaust device to obtain a plurality of model meshes and determining infrared radiation data of each model mesh comprises the following steps: dividing the three-dimensional model into a target core area and an outer flow area according to the temperature field distribution condition of the exhaust device; dividing the target core region based on a tetrahedral mesh with a preset first size aiming at the target core region to obtain a plurality of model meshes corresponding to the target core region; determining target model grids meeting a first preset condition in a plurality of model grids corresponding to the target core area, and carrying out grid local encryption processing on the target model grids meeting the first preset condition to obtain a first target model network; for each model grid corresponding to the outer flow domain, grid local adjustment is carried out on the model grid according to the distance between the model grid and the target core area to obtain a second target model grid, wherein the size of the tetrahedral grid with the preset second size is larger than that of the tetrahedral grid with the preset first size; And carrying out grid transient temperature calculation on each model grid in the combined multiple model grids to obtain grid transient temperature data corresponding to the model grid, and determining infrared radiation data of the model grid according to the grid transient temperature data corresponding to the model grid.
2. The method of claim 1, wherein the merging the first object model mesh and the second object model mesh to obtain a plurality of merged model meshes comprises: and merging the first target model grid and the second target model grid positioned at the interface position to obtain a merged model grid.
3. The method of claim 1, wherein the calculating the grid transient temperature for each of the plurality of combined model grids to obtain the grid transient temperature data corresponding to the model grid comprises: and calculating the grid transient temperature by utilizing Fluent software aiming at each model grid in the combined multiple model grids to obtain grid transient temperature data corresponding to the model grids.
4. The method of claim 1, wherein for each model mesh, generating a hierarchical bounding box corresponding to the model mesh comprises: And according to a preset merging strategy, merging the bounding boxes corresponding to all the basic geometric elements of the model network to obtain a hierarchical bounding box corresponding to the model network.
5. The method according to claim 1, wherein calculating the infrared ray path of the hierarchical bounding box corresponding to the model mesh comprises: extracting the gas transparent boundary surface element of the layer bounding box corresponding to the model grid; constructing a surface grid model corresponding to the model grid according to the gas transparent boundary surface element of the hierarchical bounding box corresponding to the model grid; determining a hierarchical bounding box corresponding to the surface grid model according to the surface grid model corresponding to the model grid; determining the intersection point of the light ray and the model grid according to the acceleration structure of the hierarchical bounding box corresponding to the surface grid model; And determining the infrared ray paths of the hierarchical bounding boxes corresponding to the model grids according to the intersection points.
6. The method according to claim 1, wherein determining the infrared ray paths of the background area according to the infrared ray paths of the hierarchical bounding boxes corresponding to all the model grids comprises: and performing coordinate transformation on the infrared ray paths of the hierarchical bounding boxes corresponding to all the model grids by utilizing the periodic symmetry characteristic of Fourier change to determine the infrared ray paths of the background area, wherein the intersection points of the infrared ray paths of the hierarchical bounding boxes corresponding to all the model grids and the background area are in the background area.
7. The method of claim 1, wherein generating infrared radiation data simulation results of the exhaust of the target vessel based on the infrared radiation data of each model grid and the infrared path of the background area comprises: based on an atmospheric attenuation equation, determining infrared radiation data of the background area according to the infrared radiation data of each model grid and the infrared ray path of the background area; and generating an infrared radiation data simulation result of the exhaust device of the target ship according to the infrared radiation data of each model grid and the infrared radiation data of the background area.
8. The utility model provides a naval vessel exhaust apparatus infrared characteristic simulation device which characterized in that includes: The acquisition unit is used for acquiring the exhaust device of the target ship and a three-dimensional model of a smoke plume field of the exhaust device; The subdivision unit is used for carrying out grid subdivision on the three-dimensional model according to the temperature field distribution condition of the exhaust device to obtain a plurality of model grids, and determining infrared radiation data of each model grid; the method comprises the steps of conducting grid division on the three-dimensional model according to the temperature field distribution situation of the exhaust device to obtain a plurality of model grids, determining infrared radiation data of each model grid, dividing the three-dimensional model into a target core area and an outer flow field according to the temperature field distribution situation of the exhaust device, dividing the target core area according to the target core area based on a preset first size tetrahedron grid to obtain a plurality of model grids corresponding to the target core area, determining the target model grids with temperature and pressure data change meeting a first preset condition in the plurality of model grids corresponding to the target core area, conducting grid local encryption processing on the target model grids meeting the first preset condition to obtain a first target model network, dividing the outer flow field according to the outer flow field to obtain a plurality of model grids corresponding to the outer flow field, combining the second size tetrahedron the second model grid according to the distance between the model and the target core area, conducting local encryption processing on the target model grids meeting the first preset condition to obtain a first target model network, combining the second size tetrahedron the second model network and the second size tetrahedron the second model network, combining the first size tetrahedron the second model network and the second size tetrahedron the second model network, performing grid transient temperature calculation on each model grid in the combined multiple model grids to obtain grid transient temperature data corresponding to the model grid, and determining infrared radiation data of the model grid according to the grid transient temperature data corresponding to the model grid; The calculation unit is used for generating a layer bounding box corresponding to each model grid according to each model grid; the determining unit is used for determining the infrared ray paths of the background area according to the infrared ray paths of the hierarchical bounding boxes corresponding to all the model grids; And the simulation unit is used for generating an infrared radiation data simulation result of the exhaust device of the target ship according to the infrared radiation data of each model grid and the infrared ray path of the background area.
9. A ship exhaust infrared characteristic simulation device, characterized in that it comprises a processor and a memory storing program instructions, wherein the processor is configured to execute the ship exhaust infrared characteristic simulation method according to any one of claims 1 to 7 when executing the program instructions.
10. An apparatus comprising the ship exhaust infrared characteristic simulation device of claim 9.

Description

Ship exhaust device infrared characteristic simulation method, device and equipment Technical Field The application relates to the technical field of simulation, in particular to a method, a device and equipment for simulating infrared characteristics of a ship exhaust device. Background The infrared radiation characteristic numerical calculation relates to multidisciplinary theory and technology such as computational fluid mechanics, computational heat transfer science, computational radiology, computer graphics and the like, and mainly solves the problem of transmission of radiation energy in a three-dimensional space. The common discrete transfer method, the finite volume method and the like need to solve the problems of large memory consumption, high calculation cost and the like for infrared radiation calculation of targets with complex structures such as targets by solving the angle coefficient and large-scale effective radiation matrix equation sets among the microelements of the high-temperature solid wall surface, the problems of low calculation accuracy and the like can be generally solved only by simplifying a target model and reducing the number of the microelements at the present stage, and the problem of low calculation accuracy is generally caused, so that good compromise is difficult to be obtained between the two methods, and secondly, because parameters such as the temperature, the pressure and the concentration of gas components are needed to be used as input for calculation of high-temperature gas and jet flow radiation of a ship exhaust device, accurate flow field calculation is needed in advance. When radiation calculation is carried out by adopting a discrete transmission method and a finite volume method, secondary grid subdivision is also required for a target, and the number of infrared grids is generally lower than two orders of magnitude of the flow field grids, so that calculation errors are introduced due to the difference of orders of magnitude in the process of mapping flow field parameters to the infrared grids. The existing infrared characteristic simulation method of the exhaust device comprises the steps of 1, conducting grid subdivision on a three-dimensional model of the exhaust device and a smoke plume field, conducting temperature assignment on the split grids, 2, conducting secondary grid subdivision on a target when radiation calculation is conducted through a discrete transmission method and a limited volume method, wherein the number of the infrared grids is generally lower than two orders of magnitude of the grid of the field, 3, calculating infrared radiation and secondary radiation characteristics of the exhaust device and the exhaust smoke plume through the discrete transmission method such as an angle coefficient between each microcell of a high-temperature solid wall surface and a large-scale effective radiation matrix equation set and the like through the limited volume method, and 4, reflecting the atmospheric transmission characteristics of the infrared radiation of the ship exhaust device through calculating the atmospheric passing rate parameter. However, the existing discrete transfer method, finite volume method and the like have the problems of large computer memory consumption, high computer cost, reduced precision after model simplification and calculation errors introduced by the difference of orders of magnitude in the process of mapping flow field parameters to the infrared grid when processing complex structure targets. Disclosure of Invention The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows. The embodiment of the disclosure provides a ship exhaust device infrared characteristic simulation method, device and equipment, so as to realize that the running speed of infrared radiation data simulation result production can be improved, the time complexity is greatly reduced, the method is approximated layer by layer in application, the method is gradually thinned, the detection efficiency is improved, and the problems that the computer memory consumption is high, the computer overhead is high, the accuracy is reduced after model simplification, and calculation errors are introduced due to the difference of orders of magnitude in the process of mapping flow field parameters to infrared grids are solved. In some embodiments, a method for simulating infrared characteristics of a ship exhaust device comprises: acquiring a three-dimensional model of a smoke plume field of an exhaust device of a target ship; According to the temperature field distribution condition of the exhaust device, carrying out grid division on the three-dimensional model to obtain a p