Direct initiation device under two different ventilation modes and test method

A detonation device, a direct technology, applied in the direction of combustion method, material explosiveness, ignition by electric spark, etc., can solve the problems of large ignition energy, increase system complexity, large engineering cost, etc., to reduce detonation ignition energy and reduce distance , Improve the effect of explosion pressure and velocity

Pending Publication Date: 2021-04-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, the direct detonation of gas phase detonation requires huge ignition energy, and the engineering cost i

Method used

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  • Direct initiation device under two different ventilation modes and test method
  • Direct initiation device under two different ventilation modes and test method
  • Direct initiation device under two different ventilation modes and test method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0042] Using the air flow of the air compressor to pass the powder into the device will increase the change of the initial pressure in the device, so the first step is to test the influence of the change of the initial pressure on the detonation parameters.

[0043]The device and material parameters used in the test are as follows: the volume of the experimental device is V=20.09L, the inner diameter is d=180mm, the distance between adjacent sensors / ion probes is L=225mm, and the ignition energy E=0.2J. The experiment was carried out under airtight conditions, the reaction medium was 99.9% high-purity acetylene, and the combustion aid was air. During the experiment, the volume of acetylene injected once was 2.04L (equivalent ratio η≈1).

[0044] Table 1 Detonation theoretical parameters of acetylene-air mixture

[0045]

[0046] As shown in Table 1, the detonation pressure and detonation velocity of the acetylene-air mixture reaching the theoretical detonation state solved ...

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Abstract

The invention discloses a direct initiation device under two different ventilation modes, which comprises a top cover, a tank body and a bottom cover, and is characterized in that the top cover and the bottom cover are respectively fixed at the top and the bottom of the tank body to form an integrally sealed cavity; an air inlet system, an exhaust system, a safety valve and an igniter are arranged on the top cover, the air inlet system and the exhaust system are both communicated with the interior of the tank body, and the air inlet system is connected with a powder spraying system; and a plurality of pressure sensors and ion probes are arranged on the side wall of the tank body. The device and the method are applied to a detonation experiment, the combustible gas explosion pressure and speed under the same condition can be increased, the detonation ignition energy is reduced, the detonation forming distance is reduced, the purpose of direct detonation is achieved, and the device and the method have positive significance in detonation engineering application.

Description

technical field [0001] The invention belongs to the technical field of detonation test devices, in particular to a test device and method for direct detonation technology in the form of powder-assisted detonation. Background technique [0002] Today, detonation technology is used in all aspects of industry. Such as: detonation engine, preparation of nano-materials by detonation method, material surface spraying and sandblasting process, gas blowing fire extinguishing device and boiler slag removal, detonation initiation has always been an important topic of research by modern scholars. However, the direct detonation of the gas phase detonation requires huge ignition energy, and the engineering cost is too high; the indirect detonation requires the addition of auxiliary devices, which increases the complexity of the system. Powder explosion has always been one of the important factors that endanger social security. It emits light and heat at the moment of explosion, consumes...

Claims

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Application Information

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IPC IPC(8): G01N25/54F23Q3/00
CPCF23Q3/006G01N25/54
Inventor 唐豪刘畅高鹤
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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