Development of a Three-Point Analog-to-Digital Device for Contactless Measurement of Cylindrical Channel Wear

• Published in: Journal of friction and wear Vol. 43; no. 2; pp. 135 - 139
• Main Authors: Burakov, V. A., Zorin, V. D., D’yachkovskiy, A. S., Ishchenko, A. N., Sidorov, A. D., Chupashev, A. V.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.04.2022; Springer Nature B.V
• Subjects: Apexes; Classical and Continuum Physics; Diameters; Entrainment; Gas dynamics; Gas flow; Measuring instruments; Melt temperature; Metal particles; Physics; Physics and Astronomy; Shear stress; Software packages; Temperature; Triangles; wear; internal ballistics; experiment; barrel systems; measurement; measuring device
• ISSN: 1068-3666; 1934-9386
• DOI: 10.3103/S1068366622020039

— The erosion of a straight cylindrical tube by the example of a small caliber (30 mm) laboratory smoothbore ballistic unit during experimental gas dynamics studies is considered. For its diagnostics a non-contact analog-to-digital measuring device allowing for determination of the coordinate of the measured section and a software package for processing the obtained data were developed. A geometric model of the detecting unit with the location of three distance sensors in the vertices of a regular triangle is presented. A prototype of the device was assembled and tested, which allows measuring the internal diameter of the smooth bore channel of any length with a caliber of 30 mm and to record the results in the computer memory in real time. Quantitative erosion of the breech face after a series of tests is given. To compare the results, a comparison is given with the readings of a certified bore micrometer. The results of gas-dynamic analysis of one of the experiments are presented in the form of diagrams of maximum pressure, gas temperatures, and the inner surface of the barrel. The highest pressure and temperature values occur at the breech face compared to the entire length of the barrel, which confirms the erosion profile. In this case, the temperature of the inner surface of the channel is much lower than the melting temperature of steel. However, in some experiments, the internal surface temperature reached a value of 980 K and higher. At this value, the strength of the steel becomes comparable to the shear stresses of the gas flow, which causes detachment and entrainment of metal particles. The use of the developed device and software package makes it possible to improve operational safety, as well as to reduce time and material costs for repair and maintenance of installations.