Analyzing Ways to Improve the Efficiency of the Leontiev Tube

The working principles of a gas-dynamic energy separation device known as the Leontiev tube are examined. Possible ways to improve the efficiency of the device are analyzed. It is shown that for gases with the values of the Prandtl number of around 0.7, it is possible to increase the amount of transferred heat by utilizing vortex heat transfer enhancement mechanisms and by using the influence of the condensed phase on the heat-transfer intensification. The existing methods for calculating this class of devices were refined to account for the condensed phase influence on the heat-transfer intensification. The refined methods take into account not only the heat of the phase change during condensation but also the effect of Mach shocks generated by the condensed phase flow on the temperature recovery factor on the wall of the supersonic flow channel. The calculation methods were verified against the experimental results obtained with natural gas. The results of numerical calculations show that in the presence of condensable components in the working gas supersonic flow, it is possible to increase the efficiency of the gas-dynamic energy separation device by 1.3–1.7 times without a significant rise of total pressure losses in the supersonic flow channel of the energy separation device.

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