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DOI 10.21440/2307-2091-2017-1-62-64

Choosing a construction of junction point of mining turbomachines and a collector pdf

V. T. Dmitriev, D. R. Gabidullin, G. A. Boyarskikh, A. O. Kochanov

Authors consider three original variants of construction of a junction point of turbomachine and collector. Junction points look like tees and include both straight sections of constant cross section and diffusers, and lead-in arc-shaped elements. The criteria for comparison is value of the coefficient of local aerodynamic resistance. This article presents the expressions for determining the optimal geometric characteristics of inlet branches and diffusers, ensuring a minimum local resistance of each of the proposed tees. One can also see minimum values of resistance coefficients for different angles between the axes of inlet branches and collector. In order to assess combined influence of joints on the loss of energy flow in the air duct authors introduced the concept of reduced coefficient of local resistance. The article contains factors that reduce the accuracy of theoretical calculations due to the lack of experimental data on aerodynamics of air-conducting tract. Authors also calculated the theoretical values of reduced coefficients of local resistance of air ducts equipped with different junction points of compressors, giving the possibility of approximate determination of energy costs of the connecting elements.

Keywords: compressor; turbo machine; air duct; junction point; tee; aerodynamic resistance; local resistance.

 

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