农业工程学报
農業工程學報
농업공정학보
2014年
4期
54-61
,共8页
数值模拟%模型%润滑%两相流%流固耦合%分动器
數值模擬%模型%潤滑%兩相流%流固耦閤%分動器
수치모의%모형%윤활%량상류%류고우합%분동기
numerical simulation%models%lubrication%two-phase flow%fluid-structure interaction%transfer case
针对分动器齿轮啮合传动中，润滑油运动过程缺乏研究和油压油速等相关参数不确定的问题，应用数值模拟与试验相结合的方法进行了详细的分析。建立分动器齿轮流场三维模型，基于流固耦合理论，应用Fluent UDF命令设定齿轮动网格运动，建立VOF两相流模型进行数值模拟，结果表明：0～0.5T（小齿轮以400 r/min速度旋转一周耗时为1T）时刻，从动大齿轮旋转带油对啮合区润滑起主要作用、速度流线在啮合区附近出现明显的漩涡现象、啮合齿面间压力值相对较大、两相流模型的改变对齿轮带油润滑效果有较大影响；应用高速摄影技术，对透明分动器壳体内流场流动情况进行观察试验，其油面波动与数值模拟结果作对比，最大误差为12.2%，误差较小，表明试验与数值模拟的分析结果相吻合。研究成果为下一步改善分动器齿轮润滑方面的工作提供参考。
針對分動器齒輪齧閤傳動中，潤滑油運動過程缺乏研究和油壓油速等相關參數不確定的問題，應用數值模擬與試驗相結閤的方法進行瞭詳細的分析。建立分動器齒輪流場三維模型，基于流固耦閤理論，應用Fluent UDF命令設定齒輪動網格運動，建立VOF兩相流模型進行數值模擬，結果錶明：0～0.5T（小齒輪以400 r/min速度鏇轉一週耗時為1T）時刻，從動大齒輪鏇轉帶油對齧閤區潤滑起主要作用、速度流線在齧閤區附近齣現明顯的漩渦現象、齧閤齒麵間壓力值相對較大、兩相流模型的改變對齒輪帶油潤滑效果有較大影響；應用高速攝影技術，對透明分動器殼體內流場流動情況進行觀察試驗，其油麵波動與數值模擬結果作對比，最大誤差為12.2%，誤差較小，錶明試驗與數值模擬的分析結果相吻閤。研究成果為下一步改善分動器齒輪潤滑方麵的工作提供參攷。
침대분동기치륜교합전동중，윤활유운동과정결핍연구화유압유속등상관삼수불학정적문제，응용수치모의여시험상결합적방법진행료상세적분석。건립분동기치륜류장삼유모형，기우류고우합이론，응용Fluent UDF명령설정치륜동망격운동，건립VOF량상류모형진행수치모의，결과표명：0～0.5T（소치륜이400 r/min속도선전일주모시위1T）시각，종동대치륜선전대유대교합구윤활기주요작용、속도류선재교합구부근출현명현적선와현상、교합치면간압력치상대교대、량상류모형적개변대치륜대유윤활효과유교대영향；응용고속섭영기술，대투명분동기각체내류장류동정황진행관찰시험，기유면파동여수치모의결과작대비，최대오차위12.2%，오차교소，표명시험여수치모의적분석결과상문합。연구성과위하일보개선분동기치륜윤활방면적공작제공삼고。
In order to investigate the characteristics of air-oil two-phase turbulent flow inside the shell of transfer case, the research method to combine test and numerical simulation is proposed to take analysis. The fluid-structure interaction theory (FSI) is a science to research the interaction and influence between fluid and structure fields, and is applied to research single-direction influencing characteristic from gears rotation to air-oil field flow. The gears of the transfer case transfer power via meshing and rotating, their movement is imitated by dynamic mesh technology is fluent. Fluent UDF definition is used to define the parameters of dynamic mesh control. The fluid field inside the shell of the transfer case has two phases:air and oil. It starts to move and show its fluid characteristics in close relationship with the motion trail of gears. The air-oil fluid field belongs to a two-phase model. It is simulated by the VOF model is fluent. The interface of gas and liquid is defined by fluent UDF definition. High speed photography is the application of advanced photographic technology for high-speed motion characteristics of a clear picture. It is used to observe high-speed motion characteristics. With a transparent shell, the transfer case assembly is installed on the test bench for the observation test. The movement of air-oil fluid field has been observed after high speed photography. The results show that, during 0-0.5T moment, driven gear to rotate with oil plays a main role in the meshing zone lubrication;at 0.25T moment, gears start to mesh and rotate, oil fluid field wave;at 0.375T moment, the gear meshing area is filled with lubricating oil;at 0.5T moment, the continuous oil inflow meshing zone above, and cover the gear meshing area of tooth surface, achieve initial lubrication. The vortex phenomenon appears near the meshing zone in the velocity streamline. The speed near the wall is higher than the other zone. The velocity streamlines into and out of the meshing zone more effectively. After the pressure field stabilizes, the flow field pressure maximum value appeared in the gear meshing area;two phases of flow field in the shell are uniform, the middle of the fluid pressure is relatively small; negative pressure appears below the driven gear part. The numerical simulation results coincide with the test. The analysis results are true and valuable.
