Mathematical model of the gas turbine engine combustor fueling on ethanol

Mykhailo Shevchenko, Maya Ambrozhevich, Oleh Selezen

Abstract


Ethanol is one of the most promising alternative fuels for Ukraine. To convert existing projects of power and cogeneration plants based on gas turbine engines (GTEs) operating on petroleum products and natural gas to ethanol, as well as for their design and performance calculation, it is necessary to have a mathematical model of the working process of GTE combustor. The object of the study is the working process of the GTE combustor fueling on ethanol. The subject of the study is a mathematical model of the working process of GTE combustor fueling on ethanol. The work aims to improve a mathematical model of the working process of a GTE combustor fueling on ethanol by changing the algorithm for calculation of the fuel air ratio, considering thermal dissociation, and a correctly formulated equivalent chemical reaction path of the combustion process. To achieve the aim, the following tasks were solved: based on the use of experimental values of specific isobaric heat capacities of combustion products, which are a function of temperature and pressure, a mathematical model of the working process of the GTE combustor was improved ("simplified" mathematical model); based on the solution of the system of equations of chemical thermodynamics, a mathematical model of the working process of the GTE combustor was developed ("complex" mathematical model); the results of calculation by "simplified" mathematical model of the working process of the GTE combustor were compared with the "complex" one. The following results were obtained: the difference in the calculation of the combustion products' thermodynamic parameters between the developed mathematical models was less than 1.2% for the three modes of the General Electric CF6-80A engine. Conclusion: the "simplified" mathematical model of the working process of the GTE combustor fueling on ethanol was improved. A feature of the model is the implicit consideration of the effect of thermal dissociation and correctly formulated equivalent chemical reaction path of the combustion process by using experimental values of specific isobaric heat capacities of combustion products. This will improve the accuracy of fuel air ratio calculation and other thermodynamic parameters of GTE combustor mathematical models fueling on ethanol, without significantly complicating the model algorithm.

Keywords


fuel air ratio; combustor; ethanol; isobaric heat capacity (specific heat at constant pressure); enthalpy; combustion products; mathematical model of the combustor

References


Elektrostantsiyi hazoturbinni [Gas turbine power plants]. JSC «MOTOR SICH» Available at https://motorsich.com/ukr/products/land/vrazrabotke/elektorstancii/ (аccessed: 15.08.2024). (In Ukrainian).

Shelestyuk, A. I. Shirokoe vnedrenie GTU NPKG «Zorya»-«Mashproekt» – naibolee effektivnyi put' modernizatsii teploenergetiki Ukrainy [Widespread implementation of the Zorya-Mashproekt gas turbine plant is the most effective way to modernize the thermal power industry of Ukraine] Naukovі pratsі. Serіya «Tekhnogenna bezpeka», 2004, vol. 18. pp. 130–134. (In Russian).

Dubov, V. A. Primenenie al'ternativnykh vidov topliva, poluchennykh iz vozobnovlyaemykh istochnikov energii, v kogeneratsionnykh ustanovkakh [Application of alternative fuels obtained from renewable energy sources in cogeneration plants] Naukovі pratsі. Serіya «Tekhnogenna bezpeka», 2010, vol. 137, no. 124. pp. 125-126. Available at: http://nbuv.gov.ua/UJRN/Npchdutb_2010_137_124_22. (accessed: 15.08.2024). (In Russian).

Skoruk, O. P. Vyrobnytstvo ta perspektyvy vykorys-tannya biopalyva u Vinnyts'kiy oblasti. [Production and Prospects of Using Biological Fuel in Vinnytsia Region] Oblik i finansy – Accounting and Finance, 2017, no. 2 (76), pp. 153-162. Available at: http://repository.vsau.org/getfile.php/16604.pdf. (accessed: 15.08.2024). (In Ukrainian).

Bіoetanol – praktika ta zastosuvannya [Bioethanol – practice and application]. PJSC "Ukrainian technology company". Available at: https://uabio.org/wp-content/uploads/2020/10/bioethanol_utc_experience-1.pdf (аccessed 15.08.2024). (In Ukrainian).

Cherednichenko, O., Havrysh, V., Shebanin, V., Kalinichenko, A., Mentel, G., & Nakonieczny, J. Local Green Power Supply Plants Based on Alcohol Regenerative Gas Turbines: Economic and Environmental Aspects. Energies, 2020, vol. 13, iss. 9, article no. 2156. DOI: 10.3390/en13092156.

Suchocki, A., Kazimierski, P., Lampart, K., Januszewicz, T., Białecki, B., Gawron, A., & Janicka, A. A comparative study of pentanol (C5 alcohol) and kerosene blends in terms of gas turbine engine performance and exhaust gas emission. Fuel, 2023, vol. 334, part 2, article no. 126741. DOI: 10.1016/j.fuel.2022.126741.

Andoga, R., Fozo, L., Schrötter, M., & Szabo, S. The Use of Ethanol as an Alternative Fuel for Small Turbojet Engines. Sustainability, 2021, vol. 13, article no. 2541. DOI: 10.3390/su13052541.

Kislov, O, Ambrozhevich, M. & Shevchenko, M. Development of a method to improve the calculation accuracy of specific fuel consumption for performance modeling of air-breathing engines. Eastern-European Journal of Enterprise Technologies, 2021, vol. 2, iss. 8 (110), pp. 23–30. DOI: 10.15587/1729-4061.2021.229515.

Shevchenko, M., Ambrozhevich, M., & Fesenko K. Working process model development of the gas turbine engine combustor fueling on methanol. Eastern-European Journal of Enterprise Technologies, 2024, vol. 2, iss. 1 (128), pp. 49–54. DOI: 10.15587/1729-4061.2024.301325.

Ambrozhevich, M. V., & Shevchenko, M. A. Analiticheskoe opredelenie udel'noi izobarnoi teploemkosti produktov sgoraniya s uchetom vliyaniya davleniya i effekta termicheskoi dissotsiatsii [Analytical Determination of Isobaric Heat Capacity of Air and Combustion Gases with Influence of Pressure and Effect of Thermal Dissociation]. Aviacijno-kosmicna tehnika i tehnologia – Aerospace technic and technology, 2019. no. 1/158, pp. 4-17. DOI: 10.32620/aktt.2019.1.01. (In Russian).

Ambrozhevich, M. V., & Shevchenko, M. A. Equations of Average Isobaric Heat Capacity of Air and Combustion Gases with Influence of Pressure and Effect of Thermal Dissociation. Aviacijno-kosmicna tehnika i tehnologia – Aerospace technic and technology, 2019. no. 2/154, pp. 18-29. DOI: 10.32620/aktt.2019.2.02.

Bonnie, J., Sanford, G., & Martin, A. Coefficients for Calculating Thermodynamic and Transport Properties of Individual Species. NASA Report, 1993, no. 4513. 94 р. Available at https://ntrs.nasa.gov/citations/19940013151. (accessed: 15.08.2024).

Bücker, D., Span, R., & Wagner, W. Thermodynamic Property Models for Moist Air and Combustion Gases. ASME, Journal of Engineering for Gas Turbine and Power, 2003, vol. 125, no. 1, pp. 374-384. Available at https://asmedigitalcollection.asme.org/gasturbinespower/article-abstract/125/1/374/461821/Thermodynamic-Property-Models-for-Moist-Air-and?redirectedFrom=fulltext. (accessed: 15.08.2024).




DOI: https://doi.org/10.32620/aktt.2024.5.01