A Burner Used to Study Oscillating Combustion Characteristics of Metal Particles

Abstract

The invention relates to a burner for researching an oscillation combustion characteristic of metal particles, in particular to combustion of the metal particles in oscillation air currents, and belongs to the field of unstable combustion. The burner consists of a horn sounder, a horn port cover, an opposite hole joint, a metal joint, a porous medium, a stainless steel cold pipe and the like. The burner uniquely adopts the horn generator to provide external acoustic excitation, and can simulate the combustion condition of aluminum powder under a low-frequency oscillation environment; and as the combustion of the aluminum powder in a solid engine is in a low-frequency acoustic oscillation environment, the simulation environment is more appropriate, and the obtained result provides more reliable theory basis for unstable combustion analysis in the solid engine. The burner adopts a premixed fuel to replace a propellant, so that the safety is improved; the combustion condition of the added aluminum powder can be directly observed in the burner; and the burner can be repeatedly experimented. The burner is excellent in use value on future research of unstable combustion of the metal parts in the oscillation air currents.

Description

technical field [0001] The invention relates to a burner used for studying the oscillating combustion characteristics of metal particles, in particular to the combustion of metal particles in an oscillating air flow, and belongs to the field of micro-unstable combustion. Background technique [0002] With the development of aerospace science and technology, solid rocket motors have technical advantages such as large thrust-to-weight ratio and easy operation compared to liquid engines, making them highly sought after. However, the instability of propellant combustion in solid motors will cause pressure in the combustion chamber The shock will lead to catastrophic consequences when it is severe, so the requirements for the working stability of solid motors are getting higher and higher. [0003] One way to solve the solid engine is to add fine metal particles to viscously damp the vibration of the sound pressure. Metal particles can not only increase the energy density of the ...

AI Technical Summary

Problems solved by technology

However, the combustion instability of metal particles under oscillating airflow is highly destructive, highly complex, and highly random, which causes great trouble to the working performance of the engine. When the sound pressure frequency and amplitude reach a certain state even damage the combustion chamber of the engine

[0004] Existing Rijke burners are only suitable for self-excited oscillating combustion tests

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