_ propellant in the vacuum system application

in vacuum system by vacuum casting propellant slurry. The propellant slurry is viscoelastic fluid. Composite viscosity with proppant types, recipe features and frequency range. Composite modulus, loss modulus and storage modulus with the increase of frequency; Loss modulus, usually it is higher than the corresponding energy storage modulus is about one order of magnitude. Several storage modulus attenuation peak; And loss Angle tangent attenuation peak alignment. Analyses the applicable period of propellant slurry and the propellant properties.

1. Higher than impulse;

2。 Dense;

3。 The products of combustion gas ( Or steam) Small molecular weight, degree of dissociation of small, non-toxic, smokeless, non-corrosive, and excluding condensate;

4。 The flame temperature is unfavorable and exorbitant, lest ablation nozzle; 5 should has a wide range of temperature adaptation;

6。 Easy ignition, stable combustion, the combustion speed can be adjusted in a wide range.

7。 The physical and chemical stability is good, can be preserved for a long time;

8, low mechanical sensitivity, in the production, processing, transportation in the safe and reliable;

9。 The economic cost is low, rich in raw materials;

10。 If it is a solid propellant, it should also have good mechanical properties, and has higher tensile strength and elongation. Commonly used main is solid and liquid propellant, also is testing a small amount of solid-liquid mixture.

the application of the propellant slurry phase refers to at the end of the mixing process or after adding curing agent, solid propellant slurry allowed into the time in the process of engine. Pulp can be dumped and flow leveling performance to meet the design requirements, during the use of paper pulp can be dumped and flow leveling time in shorter time as applicable period, formulation of curing characteristics are the main factors affect the applicable period.

vacuum system is to ensure that the water hole, small and have excellent mechanical properties and combustion stability is an important skill.

ingredients: composition in strict accordance with the requirements of composition, accurate measurement.

temperature: strictly control the temperature of each process.

degassing: to ensure a thorough clean.

final mix: ensure that within the prescribed time to complete. Mix, but should not be too long. Otherwise, the viscosity of the mixture will not increase as expected, this will affect the process is complete.

curing: must meet the specified time and temperature in the process. Control mold temperature and mixture of relative is important.

curing is complete, can't completely cooling temperature, otherwise it will affect the quality of the product.

good propellant water tower must be constructed. Water column of the internal and external should not have holes, cracks and loose spongy arrangement. Water column with the combination of the interface between before and after the burning chamber cover can not have degumming flash, otherwise it will affect the inside of the initiator. The ballistic characteristics of serious will cause of detonator explosion. Under the condition of vacuum, the use of vacuum system in propellant slurry is through plate scatter propellant slurry into multiple thin, mixed gas in the propellant slurry can effectively discharge at any time, and then pour into the incinerator room. And then produced the minimum water column in the hole. In pouring process, will be the initiator of the shell is placed in the vacuum tube. By casting technology, the slurry can be continuous degassing, and vacuum casting can improve the quality of the propellant water column. Repeatability of vacuum degree but also to ensure the quality of the water column.