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| Trajectory Analysis of High-speed Lachrymatory Jet and Experimental Research on Its Wind-resistant Performance |
| Received:March 07, 2024 Revised:April 23, 2024 |
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| DOI：10.7643/issn.1672-9242.2024.07.009 |
| KeyWord:high-speed lachrymatory jet transient collection jet trajectory wind-resistant performance target performance effectiveness evaluation |
| Author | Institution |
| CHEN Lei |
The Third Research Institute of Ministry of Public Security, Shanghai , China |
| LI Haipeng |
The Third Research Institute of Ministry of Public Security, Shanghai , China |
| YANG Guangming |
The Third Research Institute of Ministry of Public Security, Shanghai , China |
| LI Zhihao |
The Third Research Institute of Ministry of Public Security, Shanghai , China |
| WANG Zheng |
The Third Research Institute of Ministry of Public Security, Shanghai , China |
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| Abstract: |
| The work aims to explore high-speed lachrymatory jet trajectory and the effect of external wind environment on the target performance of lachrymator. A high-speed jet transient collection and wind resistance test platform was built to systematically study the jet’s dynamic characteristics and wind-resistant performance, and compare it with the current spray with lachrymator. Results showed that the high-speed lachrymatory jet presented regular column shape at the beginning with an initial diameter of 5.5 mm and an initial speed of 138.9 m/s; At 1 m, the jet had an obvious characteristic of clustering in the center with cavitation occurred around it , and the speed decreased to 88.3 m/s; At 3 m, the jet trajectory presented a divergent filamentous pattern, and the speed decreased to 42.9 m/s. While the speeds of the general lachrymatory jet were 7.9 m/s, 20.7 m/s and 7.5 m/s at 0.2 m, 1 m and 3 m respectively. The jet gradually dispersed into small granular liquid beads during the advancing process, and the overall trajectory moved downward at 3 m. In terms of wind-resistant performance, a 600 mm×900 mm target simulating the upper torso of the human body (aiming at the face) was used. Under the actions of level 0~4 side winds, the target rates of the high-speed lachrymatory jet were 85.2% to 57.4%, the center lateral deviation was less than 10 cm; While for the general lachrymatory jet, the target rates were 78.8% to 4.2% and the center lateral deviation was more than 20 cm. The high-speed lachrymatory jet trajectory has better characteristics of clustering and directionality compared with the general lachrymatory jet, meanwhile the speeds are higher overall. On the wind-resistant performance, the high-speed lachrymatory jet has obvious advantages also. In addition, it indicates that the dynamic characteristics of jet trajectory play a key role in wind stability. |
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