A molding die and molding process for a paraffin-containing fuel grain column

Abstract

The invention discloses a paraffin fuel containing propellant grain forming mould and a forming process, a funnel is designed at the upper end of the propellant grain forming mould, more than 30% of aslurry is prepared and poured in the funnel, the loading height of the hopper is regulated, and the amount of shrinkage of a paraffin fuel containing propellant grain is controlled in the hopper in the curing process. The paraffin fuel containing slurry is poured in the mould through a sectional rapid cooling method, the mould loaded with the slurry is placed in a low-temperature alcohol container to be cooled rapidly, the liquid paraffin on the upper layer automatically fills a solidification shrinkage gap of the paraffin at the lower end; a layer of vegetable parchment is adhered to the surface of a core mould and a release agent is sprayed before the placement of the mould, the core mould is isolated from the slurry, and the integrity of the geometrical shape of the paraffin fuel containing propellant grain is guaranteed. The paraffin fuel containing propellant grains with different geometrical shapes of inner holes are prepared by changing the core mould of the mould, the mould isrepeatedly used for multiple times by changing a ceramic tube, the operation is convenient and reliable, the preparation period of the experiment is shortened, and the experiment cost is reduced at the same time.

Description

technical field [0001] The invention relates to the propellant technology of a solid-liquid mixed rocket engine, in particular to a molding die and a molding process of a paraffin-containing fuel grain column. Background technique [0002] The solid-liquid hybrid engine uses solid fuel and liquid oxidant as propellants, and the fuel and oxidant are stored separately, so it has the advantages of high safety, adjustable thrust, multiple starts, and non-toxic gas. It is a very developed and applied engine. Potential aerospace engine. From pages 621 to 630 of the American magazine Journal of Propulsion & Power, Volume 18, No. 3, 2002, Karabeyoglu M A and Cantwell B J. published an article entitled Combustion of Liquefying Hybrid Propellants, the second part of Stability of Liquid Films. The Arif team of the University invented paraffin-containing fuel. Under the action of high-speed gas flow dynamics, the melting layer of the paraffin burning surface is unstable, and is entrain...

AI Technical Summary

Problems solved by technology

This method can only prepare paraffin-containing fuel grains with round holes on the burning surface, and cannot prepare special burning surface medicines; the geometric size of the inner hole of the grains cannot be guaranteed stably and accurately; due to the centrifugal force, this method cannot prepare medicines containing additives. column; the structural integrity of the column cannot be guaranteed because the air bubbles in the column cannot be removed; the preparation device of the column is complicated, the operation controllability is low, and the preparation efficiency is low

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