本文選題：變排量齒輪泵 + 流場仿真　； 參考：《上海工程技術大學》2016年碩士論文

【摘要】：變排量齒輪式機油泵因其潤滑效率高、燃油消耗率低等優(yōu)點,成為發(fā)動機機油泵的主要趨勢。但是由于變排量齒輪泵非全嚙合狀態(tài)的存在,造成了其與傳統(tǒng)定排量齒輪式機油泵的不同,使定量泵存在的空化和困油問題在變量泵中更加突出,從而導致潤滑效果降低。為提高變排量齒輪泵的總體性能,并為進一步的優(yōu)化設計提供借鑒。本文建立變排量齒輪泵CFD模型,分析了變排量齒輪泵的空化特性及流量特性,對其困油區(qū)域卸荷槽進行了優(yōu)化,并研究了齒輪副設計參數對流體輸運特性的影響規(guī)律。主要研究工作包括:第一,針對變排量齒輪泵在不同轉速時齒輪對應不同嚙合長度的特點,運用定量分析的方法對變排量齒輪泵建模并進行仿真分析,得出變排量齒輪泵在不同轉速工況時的嚙合寬度公式,并通過試驗對模型及公式進行驗證�；隍炞C的變排量齒輪泵模型進行仿真計算,對其空化特性進行分析,得出變排量齒輪泵的空化區(qū)域主要發(fā)生在進油腔齒輪嚙合區(qū)域,并進一步研究不同影響因素對其空化的影響。然后,針對變排量齒輪泵三種主要的間隙泄露進行分析,研究不同的間隙對泵流場的影響,并得出軸向間隙泄露對流場的影響最大。第二,重點研究變排量齒輪泵的困油現(xiàn)象,并對卸荷槽進行了優(yōu)化。通過分析變排量齒輪泵的困油過程,對困油容積進行求解,為變排量齒輪泵的困油分析提供理論依據。通過對變排量齒輪泵CFD模型的仿真計算,對困油區(qū)域的壓力脈動進行分析,同時研究不同影響因素對困油區(qū)域壓力脈動的影響。基于變量泵的運行機理設計契形卸荷槽結構,并運用正交實驗方法選出最優(yōu)卸荷槽形位,通過對比加新卸荷槽前后的仿真計算結果驗證了卸荷槽的有效性。結果顯示在相同的流量情況下,靠近吸油腔的困油區(qū)域壓力脈動降低9.9%,靠近排油腔的困油區(qū)域壓力脈動降低8.3%。第三,通過研究變排量齒輪泵的齒數、模數、壓力角、嚙合齒寬、重疊系數、變位系數以及齒頂高系數等齒輪副參數對泵流體輸運特性的影響,得出齒輪副參數對流體輸運特性的影響規(guī)律。并根據規(guī)律重新設計齒輪副,通過仿真計算分析重新設計齒輪副的變排量齒輪泵,計算結果得出新齒輪副使泵的排量提升3.3%,流量脈動系數降低2.1%。本文旨在建立變排量齒輪泵的流體仿真和優(yōu)化流程,所提出的方法與得出的結論,可推廣應用于其它類似變排量齒輪泵的設計,能夠為變排量齒輪泵的理論研究與設計提供一定的技術支持。
[Abstract]:Variable displacement gear pump has become the main trend of engine oil pump because of its high lubricating efficiency and low fuel consumption. However, because of the incomplete meshing state of variable displacement gear pump, it is different from the traditional constant displacement gear engine oil pump, which makes the cavitation and trapped oil problems of the quantitative pump more prominent in the variable pump, resulting in the reduction of lubricating effect. In order to improve the overall performance of variable displacement gear pump and provide reference for further optimization design. In this paper, the CFD model of variable displacement gear pump is established, the cavitation and flow characteristics of variable displacement gear pump are analyzed, the unloading slot in the oil trapped area is optimized, and the influence of gear pair design parameters on the fluid transport characteristics is studied. The main research work includes: first, according to the characteristics of variable displacement gear pump with different gear speed corresponding to different meshing length, a quantitative analysis method is used to model and simulate the variable displacement gear pump. The meshing width formula of variable displacement gear pump under different rotational speed conditions is obtained, and the model and formula are verified by experiments. Based on the verified model of variable displacement gear pump, the cavitation characteristics of variable displacement gear pump are analyzed, and the cavitation region of variable displacement gear pump is obtained. The influence of different factors on cavitation is further studied. Then, the three main clearance leaks of variable displacement gear pump are analyzed, and the influence of different clearance on the flow field of the pump is studied, and the effect of axial clearance leakage on the flow field is found to be the greatest. Secondly, the oil trap of variable displacement gear pump is studied, and the unloading slot is optimized. By analyzing the process of oil trap of variable displacement gear pump, the volume of trapped oil is solved, which provides a theoretical basis for the analysis of oil trap of variable displacement gear pump. Through the simulation of CFD model of variable displacement gear pump, the pressure pulsation in the oil trapped area is analyzed, and the influence of different factors on the pressure pulsation in the oil trapped area is studied at the same time. Based on the operation mechanism of the variable pump, the structure of the unloaded slot is designed, and the optimal unloading slot configuration is selected by orthogonal experiment. The effectiveness of the unloading slot is verified by comparing the simulation results before and after the new unloading tank is added. The results show that under the same flow rate, the pressure pulsation in the oil trapped area near the suction chamber is decreased by 9. 9%, and the pressure fluctuation in the oil trapped area near the drain chamber is decreased by 8. 3%. Thirdly, the influence of gear pair parameters, such as tooth number, modulus, pressure angle, mesh width, overlap coefficient, displacement coefficient and tooth top height coefficient, on the fluid transport characteristics of variable displacement gear pump is studied. The influence of gear pair parameters on fluid transport characteristics is obtained. According to the law, the gear pair is redesigned, and the variable displacement gear pump is redesigned by simulation calculation. The result shows that the new gear pair can increase the displacement of the pump by 3.3% and decrease the flow pulsation coefficient by 2.1%. The purpose of this paper is to establish fluid simulation and optimization flow of variable displacement gear pump. The proposed method and conclusions can be extended to other similar variable displacement gear pump design. It can provide some technical support for the theoretical research and design of variable displacement gear pump.
【學位授予單位】：上海工程技術大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：U464.137.1

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本文編號：1895861