The Experimental Study On The Law Of Prorellant Flow In A Non-Blade Mixer

As power supply of the solid rocket, solid composite propellant has gotten great attention by every powerful country on its research and production. Many of the research results have been kept as secret, advanced mixing and casting technique haven't been reported.The mixing process is a key segment in the propellant's product, western countries mainly use the vertical-vacuum mixer, our country also almost all use this type of mixer. Because there is friction between the blade and propellant, additionally, the technical index arm has always been improved recent years, and the dangerous superfine oxidant is keep increasing, risk of product the solid composite propellant is increasing quickly.As there is no agitating in the non-blade mixer, friction decreases extraordinarily. Compared with other mixers, it's safer to use the non-blade mixer under the same mix qualification. With the develop of the aerospace industry, the non-blade mixer will get more and more attention and application. Our country's research on the non-blade mixer has just started recent years, at present, many work is on the very beginning.The non-blade mixer's research can be divided into two main parts: the mechanics of the non-blade mix process and the mixing-pouring technology research, this paper mainly focus on the first part and study the flow law of the propellant. Because there is no experience and material on the non-blade mixer, this paper begins with some basic researches, and mainly works on the rheological characteristics and the flow pattern of the propellant.Based on the changing rheological characteristics of the propellant, designed the Rheological parameters test experiment for the high-plasticity propellant, and tested the rheological data. Designed and implemented the database program for different solid composite propellants, the program can save and retrieve the rheological data with the help of Access. This database program makes a base for the compute and deduce of every stage's constitutive equation of the propellant.The procedure of the propellant's mix continues for more than 3hours, by the observation of the propellant's shape through the internal stops, the shape changes sharply during the mix procedure. It needs to know the basic law of the change of the propellant's flow pattern before model and simulate the mix process. This paper combined the internal observation and theory analysis to study the change of the flow pattern.Designed and build the test system for the vibration signals of the non-blade's axe with the sensors and the DAQ card. Programmed the corresponding analysis software, analyzed the spectrum change of the vibration signal, and gets the relationship between the plow patter and spectrum of every stage during the mix procedure. The law of the flow pattern change has been studied in this paper.The research work of this paper is the base for the non-blade mixer's design, and it has also made a solid base for the later research.