Abstract
A centrifugal carbon dioxide compressor is a kind of general machine with extensive applications. The geometry of the side chambers of the compressors can be determined by studying the rotor-stator cavity with centripetal through-flow. In this paper, numerical simulations were conducted to predict the characteristics of flow and heat transfer. Three different speeds of rotation and two axial gap widths were considered. The correlations of the core swirl ratios were determined by fitting the results for two axial gap widths. The amounts of the moment coefficients of the disk were predicted. In order to better analyze the temperature field, the radial distributions of the local heat transfer coefficient were numerically investigated. According to the simulation results, the average Nusselt number was found to be dominated by the turbulent flow parameter. It also seemed to be proportional to the moment coefficient at a fixed circumferential Reynolds number.
Highlights
The main application fields of centrifugal carbon dioxide compressors are at oil exploitation sites as the supplies of injection gas or at carbon capture and storage power plants for carbon dioxide compression [1]
In order to design the geometry rationally, it is of great significance to investigate the characteristics of the flow and the heat transfer within the cavity
Θ are in good agreement with the experimental data, which proves that the numerical simulation set-ups are reasonable
Summary
The main application fields of centrifugal carbon dioxide compressors are at oil exploitation sites as the supplies of injection gas or at carbon capture and storage power plants for carbon dioxide compression [1]. To transport more fluid and to lower the energy consumption, the rotational speed of the impeller in a large centrifugal carbon dioxide compressor increases rapidly, whose circumferential. The first method, which is extensively studied, is to optimize the geometry of the impeller. The other method is to conduct the geometry optimization of the side chambers (both the front chamber and the back chamber in Figure 1), which is not sufficiently researched. The design of the side chambers in such a centrifugal compressor is becoming one of the focuses of study. In order to design the geometry rationally, it is of great significance to investigate the characteristics of the flow and the heat transfer within the cavity
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