Microwave resonator method of dynamic measurement of mass of the samples of gasifying solid fuel

Victor V Perov,Vladimir E Zarko,G.V Kuznetsov,P.A Strizhak,A.O Zhdanova

doi:10.1051/matecconf/20179201004

Abstract

The paper describes novel contactless method of determining instantaneous gasification rate of solid materials under intensive blowing the reacting (gasified) surface. Method is based on dynamic measurement of the mass of dielectric substance within specially designed microwave resonator. The attenuation of passing through the resonator signal is proportional to the actual value of the sample mass. Before firing experiments the setup is calibrated using samples of studied material with different channel radius. With the proper choice of data acquisition system one can achieve the web sample thickness resolution around few microns and time resolution higher than 1 kHz. The examples of preliminary tests with paraffin samples blown by air jets with temperatures of 350-1500 K and speeds of 375–700 m/s are presented.

Highlights

The paper describes novel contactless method of determining instantaneous gasification rate of solid materials under intensive blowing the reacting surface
The sensor is executed in the form of system of two connected coaxial resonators excited on antiphase type of fluctuations through one of two ports
The first change of the characteristic is connected with the shift of resonant frequency of an antiphase type of the fluctuations, which is caused by increase in magnitude of connection between coaxial resonators at the expense of insertion of dielectric material

Summary

Problem statement

Existing microwave techniques are intended for exploring the linear burning rate of energetic material (EM) samples [1]. They are based on registration of amplitude and phase of the microwave signal passing through a sample and reflected from the burning surface of solid fuel at the expense of sharp change of dielectric properties on the interface of between the fuel and air. Known techniques do not allow investigating the dynamic gasification processes of bored samples of solid fuel at intensive blowing the channel surface

Microwave sensor

Sensor calibration

Experiments

Conclusions