CENTRAL ASIAN

Annotation: The article concerns the technology of thermal of working surfaces of soil – cutting tools manufactured from the composite of high – cutting steelP6M5. With construction steel Achievement of high working properties of the 35ГЛ sail – cutting tools at the lowering of their manufacturing cost is the application of bimetallic compositions with the simultaneous development of new methods of the thermal treatment the off real method allows increasing the parenteral of soil –cutting part in 8 – 10 times as to devising the devising the manufacturing in 2 – 3 times


Introduction
When solving a number of practical tasks, hydraulic equipment have to deal with flows variable flows along the path.Such tasks are observed in the study of filtering in irrigation channels, during water intake from the source, during design and operation, the count of the lecturers and drainage network, with drip irrigation, etc. [1-3].
The solution is higher than the specified tasks associated with the study of the flow of water flow with unsteadied flow.[4][5][6] This article discusses the movement of the flow of variable flows along the path in the closed horizontal pipeline, taking into account the slope and hydraulic resistance.The flow in a closed horizontal drainage is moving with an increase in the flow path due to the passing flow of water.The existing methods of hydraulic calculation of tubular drains are based on the constancy of the flow and do not take into account the passing inflow of water to drainage pipes, as well as the amount of suspended particles penetrating along with water through the gifts of drainage pipes.As the experience of operating the drainage system (in the Fergana region) shows, the effectiveness of their operation is very low and does not provide the necessary decrease in the level of groundwater (Fig. 1.).[7][8][9][10].The greatest value at the free movement of water in Drene [11].From the hydraulics of the non-pressure movement, it is known that the largest throughput of the pipeline with the smallest pressure is achieved with the ratio of the depth of the water and the diameter of the pipe H / D = 0.9.The rational use of the drainage pipe is possible when satisfying this ratio.
This can be achieved by changing the diameter of the pipeline and the slope .
If the drainage bottom slope is not zero, then, denoting the angle of inclination of the bottom of the pipe to the horizon through α1, we have [12][13][14].
When the flow of consumption along the path is uniform, then the equality takes place: where L is the length of the pipeline; QK -end flow.
Taking advantage of the equality from (1) and (2), we get

Applying the boundary condition (designations correspond to the designations of work
Substituting Ω from the equations shown before (3), we have [5].
The last formula after simple transformations will take the form Thus, a nonlinear integrodifferential equation ( 6) was obtained.[6].
The solution to this equation will allow you to record the nature of the speed change.
The latter equation can be replaced by an ordinary nonlinear equation of type [7].
We solve the last equation for the case of a small slope, then, according to [7], where is the solution of the equation of the problem without taking into account the resistance and slope of the drainage; -Small value [15].
Substituting ( 9) in ( 7) and neglecting members of the second order of smallness, we get [16].
The resulting equation is solved by a consistent approximation.
Find the function of the slope of the pipe and the diameter d.After some transformations from formula (18) we get [17].
Where we have for pipe diameter expression The resulting formulas (18) and (19) for the speed of water movement coincide well with the results of experiments.The results of the calculations are shown in the table.[18].026 Thus, the calculations on the resulting formula for the velocity of the water movement in horizontal drains (19) are well coincided with the results of experimental studies [19].The results of the research confirmed that the throughput capacity of the pipeline with the smallest pressure is achieved with the value of H / D = 0.9 the depth of water to the pipe diameter.

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