Modelling of the heating process massive batch
At technological processes of metallurgy and machine industry is metals heating one of the most important operations have influence on production in term of the efficiency, quality and costs. Charge inner temperature is an important variable in the heating process, because allows to determine the phase of the material treatment (change in the structure of the material). Currently, charge inner temperature is not measured for the following reasons: the design of the furnace (moving charge), destruction of a sensor during the process, the increased cost of furnace operation etc. This article describes a method for modelling the temperature in the charge, which is a steel coil. The method calculates the charge inner temperature by measured charge surface temperature in the annealing process. The resulting accuracy is evaluated by statistical methods.
Graphic presentation of selected thermochemical properties of substances in Matlab using service oriented architecture
This contribution deals with the disclosure of the thermochemical properties of individual substances by using a service-oriented architecture through a web service that is implemented in the client environment MATLAB. The basic principles of service-oriented architecture and its use by web service are described and a specific web service that provides different thermochemical properties such as molar heat capacity, enthalpy, entropy, and the like is listed. The following describes the design and implementation of functions for the MATLAB client environment, which makes it easy to obtain, to elaborate and to make available the thermochemical properties provided by the web service. Solution of application interface is based on taking advantage of graphic user interface support MATLAB and mentioned web service. Application interface consists of parameters for identification of substance, temperature's scope and step, graph size and x-axis ticketing density as well as if appropriate of file name in which calculated graph course is in graphics format. Finally, specific examples are shown using created functions and graphics interface. Possibilities of potential uses are discussed.
Reduction of gas flow nonuniformity in gas turbine engines by means of gas-dynamic methods
Gas flow nonuniformity is one of the main sources of rotor blade vibrations in the gas turbine engines. Usually, the flow circumferential nonuniformity occurs near the annular frames, located in the flow channel of the engine. This leads to the increased dynamic stresses in blades and as a consequence to the blade damage. The goal of the research was to find an acceptable method of reducing the level of gas flow nonuniformity as the source of dynamic stresses in the rotor blades. Two different methods were investigated during this research. Thus, this study gives the ideas about methods of improving the flow structure in gas turbine engine. On the basis of existing conditions (under development or existing engine) it allows the selection of the most suitable method for reducing gas flow nonuniformity.