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In order to realize the technology of mechanized mulching planting in paddy field, the flow of surface soil in paddy field was simulated by using Fluent software, and the flow of air and mud during parallel slide of equipment in two-phase fluid medium of air and mud was studied. The simulation method of the two-phase flow was determined, and the two-phase diagram of air and mud and velocity and pressure diagrams of fluid around the model were obtained. The mud around the model was divided into four regions Mq, Mc, Mx, Ms. Based on this, the structural parameters of the mulching system were optimized. At the speed of 1.65 m / s and the viscous coefficient of 2.72kg/m·s, Fluent was used in simulation analysis and experimental verification of the four models of soil-engaging equipment in the optimized paddy field mulching system. The results show that: the increase of α, β (vertical inclination angle α = 150 ° and end embedded angle β = 150 °) can significantly improve the traction resistance and mud obstruction of the equipment. The relative error of the traction resistance of four models of cylindrical roller, elliptical roller, ejector plate and ship plate was 8.3%, 10.27%, 6.67% and 13.74% respectively. The simulation results are in good agreement with the experimental data, which verifies the reliability of the model and provides a new research method for the study on surface soil of paddy field.
numerical simulation, CFD, paddy field machiner, experiment
[1] Tong J, Zhang QZ, et al (2014). Finite element analysis and experimental verification of bionic press roller in reducing adhesion and resistance. Transaction of the Chinese Society for Agricultural Machinery 45(7): 135-140. https://doi.org/10.6041/j.issn.1000-1298.2014.07.014
[2] Firuziaan M, Estorff OV. (2003). Simulation of the Dyn-amic Behavior of Bedding-Foundation-Soil in the Time Domain. 41(2): 385-391. https://doi.org/10.1007/978-3-540-45476-2_21.
[3] Karmakar S, Kushwaha RL. (2005). Dynamic modeling of soil tool interaction: an overview from a fluid flow perspective. Terramechanics 43(3): 411-425. https://doi.org/10.1016/j.jterra.2005.05.001.
[4] Jin T, Zhang QZ, et al. (2017). Effects of bionic geometric structure press rollers on reducing rolling resistance and adhesion against soil. Applied Mechanics and Materials 461: 63-72. https://doi.org/10.4028/www.scientific.net/amm.461.63
[5] Kumar K, Delenne JY, Soga K. (2017). Mechanics of gr-anular column collapse in fluid at varying slope angles. Hydrodynamics Research and Progress 29(4): 529-541. https://doi.org/10.1016/s1001-6058(16)60766-7.
[6] Meguid MA, Ahmed MR, Hussein MG, Omeman Z. (2017). Earth pressure distribution on a rigid box covered with U-shaped geofoam wrap. International Journal of Geosynthetics & Ground Engineering 3(2): 11-21. https://doi.org/10.1007/s40891-017-0088-4.
[7] Park KM, Yoon HS, Min IK. (2017). CFD-DEM based numerical simulation of liquid-gas-particle mixture flow in dam break. Communications in Nonlinear Science & Numerical Simulation 65(1): 125-132. https://doi.org/10.1016/j.cnsns.2017.11.010.
[8] Asaf Z, Rubinstein D, Shmulevich I. (2007). Determination of discrete element model parameters required for soil tillage. Soil & Tillage Research 92(1): 227-242. https://doi.org/10.1016/j.still.2006.03.006.
[9] Borreani W, Bruzzone M, Chersola D, Firpo G, Lomonaco G, Palmero M, Panza F, Ripani M, Saracco P, Viberti CM. (2017). Preliminary thermal-fluid-dynamic assessment of an ADS irradiation facility for fast and slow neu-trons. International Journal of Heat & Technology 35(Special Issue 1): S186-S190. https://doi.org/10.18280/ijht.35sp0126.
[10] Borreani W, Chersola D, Lomonaco G, Misale M. (2017). Assessment of a 2D CFD model for a single phase natural circulation loop. International Journal of Heat & Technology 35(Special Issue 1): S300-S306. https://doi.org/10.18280/ijht.35sp0141.
[11] Bottarelli M, Bortoloni M, Bottarelli M, Bortoloni M. (2017). On the heat transfer through roof tile coverings. International Journal of Heat & Technology 35(Special Issue 1): S316-S321. https://doi.org/10.18280/ijht.35sp0143.
[12] Erkinaci T, Baytas F. (2017). CFD investigation of a sensible packed bed thermal energy storage system with different porous materials. International Journal of Heat & Technology 35(Special Issue1): S281-S287. https://doi.org/10.18280/ijht.35sp0138.
[13] Ibrahmi A, Bentaher H, Maalej A. (2014). Soil-blade or-ientation effect on tillage forces determined by 3d finite e-lement models. Spanish Journal of Agricultural Research 12(4): 941-951. https://doi.org/10.5424/sjar/2014124-5766.
[14] Xue Z, Liu Q, Emmanuel P, Qin J, Liu D, Gao W, Gong Y, Bai X. (2017). Analysis on the effects of pre-heating temperature on mechanical properties of pellets made fr-om corn stalk powder. International Journal of Heat & Technology 35(2): 421-425. https://doi.org/10.18280/ijht.350227.
[15] Caldwell RA, Feeny BF. (2016). Smooth complex orthogonal decomposition applied to traveling waves in elastic media. Springer International Publishing. https://doi.org/10.1007/978-3-319-30084-9_26.
[16] Caldwell RA, Feeny BF. (2016). Characterizing wave behavior in a beam experiment by using complex orthogonal decomposition. Journal of Vibration & Acoustics 138(4): 431-438. https://doi.org/10.1115/1.4033268.
[17] Kumar K, Delenne JY, Soga K. (2017). Mechanics of granular column collapse in fluid at varying slope angles. Hydrodynamics Research and Progress 29(4): 529-541. https://doi.org/10.1016/s10016058(16)60766-7.
[18] Meguid MA, Ahmed MR, Hussein MG, Omeman Z. (2017). Earth pressure distribution on a rigid box covered with U-Shaped geofoam wrap. International Journal of Geosynthetics & Ground Engineering 3(2): 11-20. https://doi.org/10.1007/s40891-017-0088-4.
[19] Obermayr M, Dressler K, Vrettos C, Eberhard P. (2011). Prediction of draft forces in cohesionless soil with the discrete element method. Journal of Terramechanics 48(5): 347-358. https://doi.org/10.1016/j.jterra.2011.08.003.
[20] Park KM, Yoon HS, Min IK. (2017). CFD-DEM based numerical simulation of liquid-gas-particle mixture flow in dam break. Communications in Nonlinear Science & Numerical Simulation 42(3): 10-21. https://doi.org/10.1016/j.cnsns.2017.11.010.
[21] Rashad A. (2017). Unsteady nanofluid flow over an inclined stretching surface with convective boundary condition and anisotropic slip impact. International Journal of Heat & Technology 35(1): 82-90. https://doi.org/10.18280/ijht.350111.
[22] Srinivasacharya D, Shafeeurrahman M. (2017). Joule heating effect on entropy generation in MHD mixed convection flow of chemically reacting nanofluid between two concentric cylinders. International Journal of Heat & Technology 35(3): 487-497. https://doi.org/10.18280/ijht.350305.