“The effect of the nozzle blade pitch on the velocity coefficient of the inflow turbine with partial blading of the runner

A numerical experiment with three groups of low-consumption inflow turbine with partial blading of the runner is considered in the paper. Geometric models of turbine stages with partial flapping of the runner with different grid spacing of the nozzle diaphragm have been developed. The object of this study is centripetal turbine stages with partial flapping of the impeller. The subject of the study is the efficiency coefficient and the velocity coefficient of the nozzles of the inflow turbine. The research method is numerical simulation of the working fluid flow using elements of computational gas dynamics. The aim of the study is to determine the effect of the nozzle blade pitch on the efficiency of the nozzle diaphragm of low-consumption inflow turbine with partial blading of the runner. The main objectives of the study are creating geometric models of turbine stages with different nozzle pitch, determining the boundary conditions of the experiment, conducting and processing the results of the experiment. The graphs of the dependence of the nozzle velocity coefficient and the efficiency of the low-consumption inflow turbine stage are provided. A comparative analysis of the nozzle velocity coefficient and the efficiency coefficient of three turbine stages with different grid spacing of the nozzle diaphragm is carried out. The velocity fields of the flow part of the turbine stages and the integral values of the parameters necessary for the three-dimensional calculation are obtained. The influence of the nozzle blade pitch on the velocity coefficient of the nozzle diaphragm and the efficiency coefficient of the turbine stage is determined. The nature and dependence of this geometric parameter on the efficiency of the study object is established, conclusions on further improvement of turbine stages with partial blading of the runner are made. 

1. Soloviev, Alexey Valerievich, Margarita Makarovna Chirkova, and Nikolay Frolovich Popov. “Improving the efficiency of ship power plants.” Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 4 (2018): 101–106. DOI: 10.24143/2073-1574-2018-4-101-106.

2. Erofeyev, Valentin L., Vladimir A. Zhukov, and Olesya V. Melnik. “On the possibilities of using secondary energy resources in marine engine.” Vestnik Gosudarstvennogo universiteta morskogo i rechnogo flota imeni admirala S. O. Makarova 9.3 (2017): 570–580. DOI: 10.21821/2309-5180-2017-9-3-570-580.

3. Abul, Kalam Azad. “Estimation of possibilities of heat recovery plants of the propulsion engines of largecapacity vessels of transport fleet.” Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 1 (2019): 121–125.

4. Matviienko, Valerii T., Volodymyr A. Ocheretianyi, and Andrey V. Dologlonyan. “Characteristics of operational processes of air independent single-circuit micro gas-turbine installations for underwater technology.” Vestnik Gosudarstvennogo universiteta morskogo i rechnogo flota imeni admirala S. O. Makarova 9.3 (2017): 612–618. DOI: 10.21821/2309-5180-2017-9–3-612-618.

5. Epifanov, A.A., A. I. Kirillov, and V. A. Rassohin. “Raschet trehmernogo techenija v stupenjah malorashodnyh turbin.” Nauchno-tekhnicheskie vedomosti Sankt-Peterburgskogo gosudarstvennogo politekhnicheskogo universiteta 1(142) (2012): 65–70.

6. Zabelin, N.A., G. L. Rakov, V. A. Rassokhin, A. A. Sebelev, and M. V. Smirnov. “Research of flow characteristics in low flow rate LPI turbine stages.” St. Petersburg State Polytechnical University Journal 1(166) (2013): 45–53.

7. Nguyen, A.Q., and K. L. Lapshin. “Characteristics and structure of the flow in a turbine stage with a negative gradient of the degree of reactivity.” St. Petersburg State Polytechnical University Journal 2(243) (2016) 163–173. DOI: 10.5862/JEST.243.17

8. Rassokhin, V., N. Zabelin, H. Kunte, J. Seume, S. Olennikov, M. Cherkasova, and A. Sebelev. “The design of microturbine units with low-consumed turbines constructed by LPI for heat recovery of exhaust gases of internal combustion engines.” Results of joint research activity of scientists from Saint-Petersburg State Polytechnical University and Leibniz University of Hannover. Polytechnical University Publishing House, 2014. 139–155.

9. Rakov, Gennadiy, Viktor Rassokhin, Nikolay Zabelin, Sergey Olennikov, Aleksandr Sebelev, Aleksandr Sukhanov, and Sergey Schislyaev. “A Low Emission Axial-Flow Turbine for the Utilization of Compressible Natural Gas Energy in the Gas Transport System of Russia.” International Journal of environmental & science education 11.18 (2016): 11721–11733.

10. Kryukov, Aleksey A. “Numerical simulation of the velocity coefficient of the nozzle diaphragm of a lowconsumption turbine.” Vestnik Gosudarstvennogo universiteta morskogo i rechnogo flota imeni admirala S. O. Makarova 13.6 (2021): 849–857. DOI: 10.21821/2309-5180-2021-13-6-849-857.

11. Kryukov, Aleksey A., and Sergei V. Chekhranov. “Comparison of the velocity coefficients values in the turbine stage with partial blading of the runner.” Vestnik Gosudarstvennogo universiteta morskogo i rechnogo flota imeni admirala S. O. Makarova 13.2 (2021): 257–265. DOI: 10.21821/2309-5180-2021-13-2-257-265.

12. Kriukov, Aleksei Alekseevich, and Sergei Valentinovich Chekhranov. “Three-dimensional numerical simulation of low-consumption inflow turbine with partial blading of runner.” Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 1 (2021): 74–80. DOI: 10.24143/2073-1574- 2021-1-74-80.