Abstract
This paper considers the issues of numerical modeling of nonstationary spatial gas dynamics in the pre-nozzle volume of the combustion chamber of a power plant with a cylindrical slot channel at the power plant of the mass supply surface. The numerical simulation for spatial objects is based on the solution conjugate problem of heat exchange by the control volume method in the open integrated platform for numerical simulation of continuum mechanics problems (openFoam). The calculation results for gas-dynamic and thermal processes in the power plant with a four-nozzle cover are presented. The analysis of gas-dynamic parameters and thermal flows near the nozzle cover, depending on the canal geometry, is given. The topological features of the flow structure and thermophysical parameters near the nozzle cap were studied. For the first time, the transformation of topological features of the flow structure in the pre-nozzle volume at changes in the mass channel’s geometry is revealed, described, and analyzed. The dependence of the Nusselt number in the central point of stagnation on the time of the power plants operation is revealed.
Highlights
Despite the high level and widespread use of mathematical modeling methods, there are no data on the assessment of unsteady heat exchanges of complex threedimensional flows in the flow paths of power plants
Changing geomeis associated a change of in the the energy characteristics flow and requires the additional try of the mass supply channels in the radial direction leads to an increase in the mass research
The presence of several types of topological features arising from the interaction of a three-dimensional flow with solid surfaces of the flow paths of power plants was revealed, described and analyzed
Summary
Despite the high level and widespread use of mathematical modeling methods, there are no data on the assessment of unsteady heat exchanges of complex threedimensional flows in the flow paths of power plants. The relationship of the flow structure in such devices with a local unsteady heat exchange is practically not studied. It should be noted that, in the case of the process unsteadiness, the transitions between unstable topological features are associated with nonstationary oscillations of flows, which may cause changes in flow characteristics and frequency disturbances. That is, they can lead to abnormal operating modes of such devices. A unified approach from a topological point of view is needed to assess such phenomena for three-dimensional flows in the channels of power plants
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