Pipeless ventilation of blind roadways
The way of bestrubny airing of deadlock excavations with the description of its advantages and shortcomings is presented. On the basis of studying and the analysis of materials the conclusion is drawn on a zavyshennost of estimates of efficiency of this way of supply of fresh air in a face. The mathematical model for determination of the maximum length of airing by the fan placed on the combine or in the mouth of development is offered. When modeling provisions of the theory of turbulent streams and mathematical methods of the solution of the differential equations are used. It is shown that the dalnoboynost of an air stream is limited to the mechanism of hashing of counter flows as a result of which the consumption of air decreases with distance under the exponential law. It is established that the results received on the basis of mathematical modeling of bestrubny airing of deadlock developments, will be coordinated with experimental data and testify to possibility of effective use of the presented way of supply of fresh air on the small distances, about 20 meters for potash mines and 70 meters - for plaster mines.