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Refinement Diagnostics of Solid Fuel Diffusion Combustion Burners

A solid fuel, diffusion combustion technology, used in machines/engines, rocket engine devices, jet propulsion devices, etc., can solve the problems of unthrottled devices, combustion chamber shell ablation, low oxygen utilization rate, etc. The effect of mixing degree, high reuse rate and improving utilization rate

Inactive Publication Date: 2020-07-03
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The combustion chamber adopts a metal shell and has no thermal protection measures. During the combustion process, the high-temperature gas is likely to cause ablation of the combustion chamber shell, which makes the combustion chamber unable to be reused. The combustion method is single-side charge combustion, and the oxygen utilization rate is low.
[0006] 2. The combustion chamber is directly connected to the atmosphere through the exhaust pipe, and there is no throttling device at the outlet. The pressure of the combustion chamber is always kept at atmospheric pressure
[0007] 3. The oxidant injection method is single, and it is impossible to observe the diffusion combustion phenomenon of solid fuel under different oxidant injection methods

Method used

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  • Refinement Diagnostics of Solid Fuel Diffusion Combustion Burners
  • Refinement Diagnostics of Solid Fuel Diffusion Combustion Burners
  • Refinement Diagnostics of Solid Fuel Diffusion Combustion Burners

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Embodiment 1: When center jet injection is adopted, the injector uses the center jet injector 4, the number of nozzles of the center jet injector 4 is designed to be 17, and the diameter of the nozzle is 3 mm. The fuel is cut into a number of long strips with a length of 20mm×20mm and a length of 60mm. Weigh absolute ethanol and polyvinyl butyral according to the mass fraction of 92% and 8% to configure the coating solution, slowly add polyvinyl butyral to absolute ethanol, place it in a water bath at 50°C, and use a glass rod to Stir continuously until the polyvinyl butyral is completely dissolved, and use the prepared coating solution to evenly coat the side of the solid fuel 18 to ensure that the charges burn in parallel layers. Use a twist drill with a diameter of 0.5mm to drill a hole on one of the solid fuel 18 rods and the graphite insulation layer C 14. The depth of the inner hole of the solid fuel is 2 / 3 of the height of the fuel (so that the solid fuel window ...

Embodiment 2

[0074] Embodiment 2: When swirl injection is used, the central jet injector 4 is replaced with a four-corner tangential circle centrifugal injector 5, and the quartz glass 15 is replaced with an arc-shaped quartz glass 26. The four-corner tangential circle centrifugal injector 5 has a tangential air inlet nozzle diameter D=6mm. Trimming the solid fuel 18 grains makes it have a π / 2 arc with the same radius as the curved quartz glass 26 to ensure the swirling environment of the oxidant in the combustion chamber 7 . Weigh absolute ethanol and polyvinyl butyral according to the mass fraction of 92% and 8% to configure the coating solution, slowly add polyvinyl butyral to absolute ethanol, place it in a water bath at 50°C, and use a glass rod to Stir continuously until the polyvinyl butyral is completely dissolved, and use the prepared coating solution to evenly coat the side of the solid fuel 18 to ensure that the charges burn in parallel layers. Use a twist drill bit with a diam...

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Abstract

The invention provides a solid fuel diffusive combustion fine diagnosis combustor which comprises a combustion chamber, a combustion chamber top cover and an ignition seat device. A first stepped through hole is formed in the gas inlet wall face of the combustion chamber and used for installing a gas inlet cavity in a coaxial mode. A second stepped through hole is formed in the gas outlet wall face of the combustion chamber and used for installing an effuser. Windows are formed in the wall faces on the two sides of the combustion chamber. Quartz glass is fixed to the windows of the combustion chamber through glass cover plates and used for observing the combustion process of a rocket engine in real time. Both the bottom face of the combustion chamber and the combustion chamber top cover are provided with filling grooves. Second heat insulating layers are arranged in the two filling grooves. Solid fuel is fixed to the second heat insulating layers. The filling grooves are additionally formed in the combustion chamber, the mixing degree between an oxidizing agent and the fuel is improved, and the oxygen utilization ratio in the combustion process is increased; and an effuser throttling device is additionally arranged, effusers with different throat diameters are changed according to different requirements, and the effect of combustion chamber pressure on solid fuel diffusive combustion can be effectively analyzed.

Description

technical field [0001] The invention belongs to the field of rocket engines, and in particular relates to a refined diagnosis burner for solid fuel diffusion combustion, which is used for optical diagnosis and mechanism research of the rocket engine combustion process. Background technique [0002] The solid-liquid hybrid rocket engine has the advantages of high safety and reliability, simple system, high specific impulse, and adjustable thrust, and has gradually become a research hotspot in aerospace propulsion systems. The thrust is difficult to meet the launch requirements. Due to the characteristics of separate storage of fuel and oxidant in the solid-liquid hybrid engine, the typical diffusion combustion occurs between the oxidant and fuel, and the scale of diffusion combustion is relatively large, and the combustion process directly affects the retreat of the combustion surface of the fuel. Observing the diffusion combustion process of fuel by using a fine-grained dia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02K9/34F02K9/30F02K9/95F02K9/96
CPCF02K9/30F02K9/34F02K9/95F02K9/96
Inventor 刘林林陈泽斌胡松启
Owner NORTHWESTERN POLYTECHNICAL UNIV
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