Abstract
A new and unique measurement system is presented, based on microwave transmission interferometry. The system has been developed after successful experiments with re ection microwave interferometry and operates in the Ka-band (35 GHz). It is used for the direct and continuous measurement of the instantaneous burning rate of solid rocket propellants at different pressures and different gas ows over the burning surface in a solid rocket motor. The system consists of an experimental motor, microwave installation, hardware, and special software for data reduction. The software yields burning-rate data immediately after test runs. The principle of the measurement method and data reduction is given in this paper, together with a description of the test motor and microwave installation. Base and erosive burning rates are given for three types of ammonium perchlorate – polyvinyl chloride-based composite rocket propellant formulations. The results demonstrate that the transmission microwave interferometry system is a reliable tool for nonintrusive determination of instantaneous burning surface location of a centerperforated cylindrical propellant grain.
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