CN-121633184-B - High-pressure gas explosion test system in porous digital scorch test system

CN121633184BCN 121633184 BCN121633184 BCN 121633184BCN-121633184-B

Abstract

The invention belongs to the technical field of explosion mechanics and experimental stress analysis, and particularly discloses a high-pressure gas explosion test system in a porous digital scorching and scattering test system. The system comprises four subsystems of high-pressure gas explosion occurrence, multi-hole Jiao Sanguang chemical measurement, data acquisition and processing, integrated control and synchronous triggering. The FPGA module is used for carrying out real-time segmentation and feature extraction on the image to compress data, and the synchronous triggering is used for ensuring the accurate synchronization of the explosion, illumination and acquisition time sequence, so that the high-efficiency, reliable and automatic observation and analysis of the explosion transient physical field are realized. The system is not only suitable for standard explosion wave research, but also can be flexibly adapted to the front-edge scientific problems of simulating complex turbulent flow fields, researching wave system interaction and the like, and expands the application boundary and scientific research value of the porous digital focusing and scattering technology.

Inventors

GONG XUDONG
YAN MINHAO
HE JINCHENG
LIU XINGXIN
REN YI
ZHU YUNYAO

Assignees

绵阳科技城新区特种材料产业技术研究院

Dates

Publication Date: 20260505
Application Date: 20260204

Claims (8)

1. The high-pressure gas explosion test system in the porous digital coke powder test system is characterized by comprising: The high-pressure gas explosion generation subsystem is used for generating a controllable high-pressure gas explosion source and comprises a high-pressure gas chamber, a quick release valve, an explosion cavity, a pressure sensor array and a safety protection cover; the multi-aperture Jiao Sanguang optical measurement subsystem is used for performing space multi-point synchronous optical observation on a transient physical field generated by explosion and comprises an extended light source, a collimating lens group, a multi-aperture plate, an imaging lens group and a high-speed image sensor; The data acquisition and processing subsystem is used for carrying out high-efficiency acquisition, compression and real-time analysis on the observed image and comprises an image acquisition card, a field programmable gate array preprocessing module and an upper computer analysis unit; The integrated control and synchronous triggering subsystem is used for coordinating the time sequence actions and the safety interlocking of all subsystems and comprises a main control unit, a distributed slave control unit and a synchronous signal generator; light emitted by the expansion light source sequentially passes through the collimating lens group to form parallel light, and the parallel light vertically passes through the explosion cavity and a transient flow field in the explosion cavity; The porous plate is of a planar array structure, and is etched with a micropore array in regular matrix arrangement, wherein the diameter of each micropore is 50-200 micrometers, and the center distance of adjacent micropores is 3-5 times of the aperture; The multi-path sub-beams formed after passing through the porous plate are converged by the imaging lens group, and corresponding multi-focal speckle array images are formed on the target surface of the high-speed image sensor; The image preprocessing logic executed by the field programmable gate array preprocessing module is specifically as follows: carrying out real-time region segmentation and feature extraction on an input high-speed image data stream; The image preprocessing logic firstly divides an image subarea corresponding to each independent focal speckle from each frame of original image according to a pre-stored space coordinate template of the multi-focal speckle array; Then, executing an edge detection algorithm based on gray gradient on each image subarea in parallel to extract a contour pixel coordinate set of the focal speckle; and finally, packaging the extracted contour coordinate sets of all the focal speckles and the corresponding time stamps, generating a compressed characteristic data packet, and transmitting the compressed characteristic data packet to the upper computer analysis unit.
2. The high-pressure gas explosion test system in the porous digital scorch experiment system according to claim 1, wherein the high-pressure gas chamber is connected with the inlet of the quick release valve through a high-pressure pipeline; the outlet of the quick release valve is rigidly connected with the air inlet of the explosion cavity; The explosion cavity is a closed container made of transparent materials, and a turbulence structure for forming a specific flow field is preset in the explosion cavity; The pressure sensor array is embedded into the inner wall of the explosion cavity in a space grid form and is used for monitoring the pressure dynamics in the cavity at multiple points; the safety protection cover is coated outside the explosion cavity, is made of high-strength transparent composite materials, and is provided with a reserved window for the light path to pass through.
3. The high-pressure gas explosion test system in the porous digital focus-dispersion test system according to claim 1, wherein the image acquisition card is directly connected with a data output interface of the high-speed image sensor and is responsible for receiving an original image data stream; The field programmable gate array preprocessing module is integrated in the image acquisition card, and image preprocessing logic is solidified in the field programmable gate array preprocessing module; The upper computer analysis unit is connected with the image acquisition card through a high-speed data bus, and runs the focus-scatter image inversion analysis software.
4. The high-pressure gas explosion test system in the porous digital coke dispersion test system according to claim 1, wherein the main control unit is a human-computer interaction interface and a total logic controller; The distributed slave control unit comprises an air path control unit, a light source control unit and a camera control unit, which are respectively connected with the quick release valve, the extended light source and the high-speed image sensor through special control buses; The synchronous signal generator receives a trigger signal from the pressure sensor array or a manual trigger instruction from the main control unit, generates a plurality of synchronous pulse signals with accurate delay relation, and sends the synchronous pulse signals to the quick release valve, the extended light source and the high-speed image sensor respectively to ensure strict time sequence synchronization among explosion initiation, light source illumination and image acquisition.
5. The high-pressure gas explosion test system in the porous digital scorch experiment system according to claim 1, wherein the scorch image inversion analysis software operated by the upper computer analysis unit performs the following steps: receiving a characteristic data packet from the field programmable gate array preprocessing module; Fitting a contour coordinate set of each focal speckle in the data packet by using a focal scattered line equation based on geometrical optics, and calculating geometrical characteristic parameters of the focal speckle, including a main curvature radius and a focus offset; converting the geometric characteristic parameters into pressure values and density gradient values at corresponding space points according to the pre-calibrated mapping relation between the refractive index of the medium and the pressure and density; And reconstructing the physical quantity of all the space points into a full-field pressure distribution cloud image and a density gradient field of the explosion field at corresponding moments by combining the space position calibration data of the porous plate.
6. The high-pressure gas explosion test system in the porous digital coke dispersion test system according to claim 1, wherein a protective shutter capable of being opened and closed automatically is installed at a reserved window of the safety protective cover; The protection shutter is linked with the integrated control and synchronous triggering subsystem, and the control logic is that the protection shutter is kept in an open state from the time when the system enters a preparation state to the time when an explosion test is completed, and the protection shutter is automatically closed within 100 milliseconds after the test is completed or when the system detects abnormal vibration.
7. The high-pressure gas explosion test system in the porous digital coke dispersion test system according to claim 1, wherein the multi-channel synchronous pulse signal generated by the synchronous signal generator has a programmable delay sequence, and the delay sequence is defined as: the 1 st path pulse triggers the quick release valve to open, which is defined as time zero point ; Pulse 2 in Triggering the extended light source to reach preset light intensity at the moment, and changing the first time Presetting according to gas filling pressure and valve characteristics; Pulse 3 Triggering the high-speed image sensor to start acquisition at the moment, and obtaining the second time variation The time of arrival of the shock wave at the observation area is set according to the expected time of arrival of the shock wave, and the acquisition duration and frame rate of the high-speed image sensor are determined by the width and frequency of the pulse.
8. The high-pressure gas explosion test system in the porous digital coke breeder test system according to claim 1, wherein the system operation modes comprise a single-shot mode and a cyclic trigger mode; in a single trigger mode, a single explosion and data acquisition are executed by a single synchronization sequence; And in the cyclic triggering mode, the integrated control and synchronous triggering subsystem automatically controls the high-pressure air chamber to recharge after a single test is finished, and restarts the synchronous sequence after the pressure reaches a set value and the system state self-checking passes, so that unmanned continuous repeated tests are realized.

Description

High-pressure gas explosion test system in porous digital scorch test system Technical Field The invention belongs to the technical field of explosion mechanics and experimental stress analysis, and particularly relates to a high-pressure gas explosion test system in a porous digital coke dispersion test system. Background In the field of research of explosion mechanics and fluid dynamics, accurate observation and quantitative analysis of transient and high-pressure physical phenomena are key to revealing the inherent mechanism. The digital focal powder experimental system is used as an advanced optical measurement technology, and can acquire key physical parameters such as the form of an explosion impact wave front, the distribution of a pressure field and the like in a non-contact manner by recording and analyzing focal speckle images generated by refractive index gradient changes in a transparent medium, so that the digital focal powder experimental system becomes an indispensable research means in the field. The porous digital focus scattering experimental system aims to realize synchronous observation of a larger space range or higher space resolution of an explosion field by introducing a porous array structure so as to capture multipoint detail information of an explosion process. The basic principle of the system is that a high-speed camera is used for recording the evolution of the astigmatic focal beam after passing through a perforated plate, and then inversion is carried out to obtain the full-field dynamic physical quantity. In the prior art, in order to analyze transient physical processes such as explosion shock waves and the like in microsecond or even nanosecond levels, high-speed imaging equipment with extremely high sampling rate is required to be relied on. However, the extremely high sampling rate directly results in an extremely large amount of image data generated by a single experiment, and creates a great pressure on the data transmission bandwidth, the data storage medium, and the subsequent image processing computing resources. Meanwhile, the information capturing efficiency of the existing system is limited by the physical bottleneck of hardware performance, and when pursuing higher time resolution and larger space observation range, the capturing efficiency of effective information is difficult to consider, and the improvement of the capturing efficiency of effective information is faced with a barrier. In addition, aiming at the high-pressure gas explosion test, how to integrate the porous burnt scattered optical system with the test subsystems such as high-pressure gas quick release, safety protection, synchronous trigger control and the like in an efficient and reliable way, and ensure the stability and the precision of optical measurement under extreme conditions is a difficult problem which is not solved by the system in the prior art. Therefore, a high-pressure gas explosion test system capable of efficiently processing mass data, optimizing information capturing efficiency and realizing close coordination of subsystems is needed. Disclosure of Invention The invention aims to provide a high-pressure gas explosion test system in a porous digital coke breeder experiment system, which is used for solving the technical contradiction that the processing pressure is huge, the information capturing efficiency is limited by hardware bottleneck and the integration of a porous Jiao Sanguang system and a high-pressure gas explosion test subsystem is difficult and the cooperativity is poor due to mass data generated by high-speed imaging in the prior art. The invention provides a high-pressure gas explosion test system in a porous digital coke dispersion test system, which comprises: The high-pressure gas explosion generation subsystem is used for generating a controllable high-pressure gas explosion source and comprises a high-pressure gas chamber, a quick release valve, an explosion cavity, a pressure sensor array and a safety protection cover; the multi-aperture Jiao Sanguang optical measurement subsystem is used for performing space multi-point synchronous optical observation on a transient physical field generated by explosion and comprises an extended light source, a collimating lens group, a multi-aperture plate, an imaging lens group and a high-speed image sensor; The data acquisition and processing subsystem is used for carrying out high-efficiency acquisition, compression and real-time analysis on the observed image and comprises an image acquisition card, a field programmable gate array preprocessing module and an upper computer analysis unit; the integrated control and synchronous triggering subsystem is used for coordinating the time sequence actions and the safety interlocking of all subsystems and comprises a main control unit, a distributed slave control unit and a synchronous signal generator. Preferably, the high-pressure air chamber is connected with the inlet of th