In 1936, in the laboratory of mine ventilation, associate professor V. B. Komarov and assistant A. A. Geskin carried out work to determine the resistance coefficients of turns of ventilation pipelines while simultaneously narrowing them. This work set itself the task of determining the resistance coefficients of turns of channels mine fans, designed in various ways. The work was divided into two parts: a) determination of the rotation coefficients with simultaneous compression of the air stream, b) determination of the rotation coefficient with simultaneous expansion of the air stream. This work presents the second part of determining the resistance coefficients of channel turns. The work done by the authors makes it possible to clarify a number of provisions related to the design of fan channels when fans operate to pump air into the shaft.
