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COMPARISON OF THE VELOCITY COEFFICIENTS VALUES IN THE TURBINE STAGE WITH PARTIAL BLADING OF THE RUNNER

https://doi.org/10.21821/2309-5180-2021-13-2-257-265

Abstract

Modern marine turbine units are distinguished by a variety of purposes, types, structural differences, materials and working bodies. This diversity is ensured by the use of innovative information technologies from the preproduction process to the production of final products. It is noted that at the design stage of the turbomachine, it is necessary to take into account the external characteristics of the stage - power, angular velocity, shaft torque, efficiency, etc. It is emphasized that in an effort to reduce the losses in the stage, engineers resort to creating low-consumption partial turbines, in which a significant part of the losses from the partiality decreases due to changes in design parameters. An example of such a design is a turbine with partial blading of the runner. The object of the study is a low-consumption inflow turbine with partial blading of the runner with different admission intensity. The subject of the study is the gas-dynamic characteristics of the flow part of the nozzle diaphragm and the runner of the low-consumption inflow turbine. The main objective of the study is to compare the values of the velocity coefficients of the nozzle diaphragm and the runner of the turbine stage. It is noted that low-consumptions are characterized by small dimensions that do not allow to properly conducting a physical experiment. The method of research in the proposed work is numerical simulation of gas flow using computational gas dynamics. The graphs of the dependence of the velocity coefficients of the nozzle diaphragm and the runner at different admission intensity on u1/C0 are presented in the paper. The unsatisfactory convergence of the coefficients values is established and recommendations for improving the convergence of the gas-dynamic calculation are proposed.

About the Authors

A. A. Kryukov
Far Eastern State Technical Fisheries University
Russian Federation


S. V. Chekhranov
Far Eastern State Technical Fisheries University
Russian Federation


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Review

For citations:


Kryukov A.A., Chekhranov S.V. 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. 2021;13(2):257-265. (In Russ.) https://doi.org/10.21821/2309-5180-2021-13-2-257-265

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