Аuthors
1*, 2**1. Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia
2. ,
*e-mail: kochnevkirillvl@gmail.com
**e-mail: nenarokomovav@mai.ru
Abstract
The article describes the process of a prototype setup creating for conducting experiments on sintering under terrestrial conditions. Solar concentrator is the main working tool of the prototype. The article depicts both optical unit and the principle of its operation.
The initial parameters of the prototype were obtained from the design model of an automatic lunar apparatus for testing the lunar regolith sintering process under the impact of concentrated sunlight. In their previous works the authors performed an analysis of chemical and granulometric composition of the lunar regolith. Conditions under which the apparatus should perform its task on the Moon were studied as well. Based on this data, the design image of the lunar apparatus was formed. The main attention was paid to the optical unit design and characteristics being the basic instrument of the device. Sources studying revealed that the best option for a concentrator is a parabolic mirror with an aperture of about 60° with a reflective surface coated with protected aluminum. The optical block consists of three mirrors. The first mirror is parabolic. It collects and focuses the sunlight. The second mirror directs the flow of rays into the installation and increase es the distance to their intersection point. The third mirror is necessary for the Sun rays always fall into the sintering zone.
The prototype was created for testing theoretical calculations of sintering processes. As for now, the activities on the prototype continue. Thus, an analysis of possible deviations of its characteristics from the calculated ideal ones was performed. Three reasons for the prototype characteristics degradation were identified. They are the quality of the mirrors’ surface, insufficient reflection coefficients of the mirror surfaces coatings, inaccuracies in the optical system elements installing. A plan for the effectiveness evaluation of the optical system has been developed. For this, the authors proposed creating additional equipment that will help tracking the sunlight propagation inside the optical system.
Keywords:
lunar regolith, sintering, additive technologies, solar concentrator, heat transfer inverse problem, parametric identificationReferences
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