CFD SIMULATION OF THE STRENGTH CHARACTERISTICS OF HELICAL TUBES UNDER NON-ISOTHERMAL CONDITIONS OF THE INTERNAL FLOW

The article is devoted to the analysis of the strength characteristics of a helical tube, with the flow inside it in non-isothermal conditions. Such tubes are planned to be used as heating surfaces for condensers, steam heaters, air heaters of industrial boilers, for example E-50-4-440G. The relevance of the article material is inextricably linked with the problem of upgrading existing heat exchange equipment. The most metal-intensive part in the mentioned equipment is the heat exchange section, which usually consists of traditional round or round-finned tubes. It is possible to reduce metal consumption, possibly using methods of intensification of heat exchange both from the side of the flow moving in the middle of the tubes and from the side of the flow, washing these tubes from the outside. These requirements are met by those developed at KPI. Igor Sikorsky spiral tubes with a so-called equally developed surface. A study was made of the strength of a brass helical tube with an equally developed surface during internal flow of air by means of CFD modeling. The aim of the work is to determine the stresses and deformations of the helical tubes under the influence of the internal pressure of the non-isothermal flow. Geometric characteristics of helical tubes, under which the balance between the thermal-hydraulic characteristics is observed, is selected on the basis of the previous works of the authors. The verification of CFD-modeling data was carried out using a comparison with a test task known from the literature.