Development and Assessment of the Applicability of a 1D Procedure for Analyzing the Performance of a Radial Turboexpander Operating on Mixed Working Fluids
DOI:
https://doi.org/10.24160/1993-6982-2025-5-72-82Keywords:
turboexpander, CFD, calculation procedure, velocity pattern, gas mixtures, thermal gas dynamicsAbstract
The article addresses the development and assessment of the applicability of a quasi 1D design methodology for analyzing the performance of a radial turboexpander stage operating on mixed working fluids without considering phase transitions. The applicability of the proposed methodology is assessed by comparing the results obtained using the newly developed approach with the results of CFD calculations carried out in a cyclosymmetric formulation with periodic boundary conditions. Comparison with CFD calculations is adopted in view of complexity of setting up a full-scale experiment, as well as an insufficient scope of materials available in open sources. The developed calculation procedure is based on well-known approaches, but differs from them in offering the possibility of using the equations of state of real gases, considering a mixed working fluid, as well as the transition to the direct setting of isentropic efficiencies of stage elements instead of iterative determination of flow coefficients. This made it possible to simplify the procedure without loss of accuracy. The calculation procedure and its software implementation were tested using the example of constructing the characteristics of a stage for a mixed working fluid (dry air was chosen as an example). A design calculation was carried out, and the geometric and thermal gas dynamic characteristics were determined, which were used as initial conditions for the CFD calculation. Good agreement between the two calculation methods has been obtained; the maximum difference in the characteristics is within 3%, which does not exceed the numerical method uncertainty. Velocity patterns determined using both the approaches (1D calculation and CFD application) have been constructed, the results of which are in good agreement with each other. Based on the CFD calculation results, the pressure and temperature distributions in the radial and meridional sections have been constructed, and the values along the meridional section central line are also given. The consistency of the results with the expanding process physical principles is shown. A non-uniform distribution of temperatures along the height of the guide vane and impeller channels has been revealed. Further development of the procedure is aimed at taking into account possible phase transitions (bulk condensation) in the flow path.
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Для цитирования: Сидоров А.А., Ястребов А.К. Разработка одномерной методики и оценка ее применимости при определении характеристик радиального турбодетандера для смесевых рабочих тел // Вестник МЭИ. 2025. № 5. С. 72—83. DOI: 10.24160/1993-6982-2025-5-72-82
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Работа выполнена при поддержке Российского научного фонда (проект № 23-29-00540)
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Конфликт интересов: авторы заявляют об отсутствии конфликта интересов
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For citation: Sidorov A.A., Yastrebov A.K. Scientific Development and Assessment of the Applicability of a 1D Procedure for Analyzing the Performance of a Radial Turboexpander Operating on Mixed Working Fluids. Bulletin of MPEI. 2025;5:72—83. (in Russian). DOI: 10.24160/1993-6982-2025-5-72-82
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The Work was Carried Out Russian Science Foundation (Project No. 23-29-00540)
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Conflict of interests: the authors declare no conflict of interest
