Sunflower is the main oil crop in Russia. Sunflower plantings occupy more than 95% of the area under oil crops and annually make 7.07% of the area under grain crops. The urgent problem is the loss of oilseeds behind the header during sunflower harvesting which, according to agro-technical requirements, should not exceed 2.5% of the actual yield. The article presents the average loss of oilseeds behind various sunflower harvesting attachments. The analysis of rationality of their use depending on the area under sunflower plantings is given. The design is offered and the scheme is substantiated of the performance of an auger-reel for sunflower harvesting attachment. The developed auger-reel is equipped with a winding, which allows reducing the acceleration of the sunflower head movement during the harvesting and minimizing the loss of oilseeds behind the header to 0.63%. The results of the production tests of the developed attachment with “Niva” SK-5-M-1 and ACROS 530 combine harvesters are presented. Their comparison with the average losses of oilseeds using different by design attachments is given.
The article presents the design of the rotary working body of a universal rotary cultivator. The effect of kinematic and design parameters of the proposed working body on the quality of tillage is considered and their mathematical dependencies are determined.
The paper presents the results of large-scale experimental and simulation study of the propagation of premixed near the lower flammability limit hydrogen–air spherical flame. Experiments were carried out in a cylindrical volume of 4.5 m3 covered with thin polyethylene film. The effect of buoyancy and stability of the flame ball in the unconfined volume are studied experimentally and numerically. Numerical analysis of the problem shows that the flame ball becomes unstable after some period of stable propagation that qualitatively corresponds with experimental results. The effect of chemistry in a flame ball propagation process is studied numerically. A comparison of experimental results and numerical simulations are presented. A comparison of numerical simulations with and without chemistry is shown. The subject and results of the study are of critical importance for the industrial explosion safety and hydrogen safety of nuclear power plants.
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