【摘要】：雙渦輪液力變矩器在工程機(jī)械行業(yè)應(yīng)用越來越廣泛,作為液力傳動系統(tǒng)的核心部件之一,提高液力變矩器的效率是關(guān)鍵。本文結(jié)合“浙江臨海機(jī)械有限公司”委托的科研項目,利用計算流體力學(xué)軟件,對雙渦輪液力變矩器的內(nèi)部流場及性能進(jìn)行了數(shù)值計算分析,在此基礎(chǔ)上分別對泵輪、一級渦輪和二級渦輪進(jìn)行了多種方案的優(yōu)化改型,并詳細(xì)分析改型結(jié)果,得出一種最佳優(yōu)化方案,提高了雙渦輪液力變矩器的轉(zhuǎn)矩比和效率。主要研究內(nèi)容如下:1、根據(jù)廠家提供的液力變矩器木模圖數(shù)據(jù),利用SolidWorks造型軟件建立幾何模型,并將幾何模型導(dǎo)入Bladegen中建立計算流道模型,然后利用CFX計算軟件進(jìn)行數(shù)值模擬計算,根據(jù)數(shù)值模擬計算結(jié)果詳細(xì)的分析了各個轉(zhuǎn)速比工況下泵輪、一級渦輪、二級渦輪和導(dǎo)輪的內(nèi)部流動情況,并預(yù)測得到雙渦輪液力變矩器的原始特性,與試驗結(jié)果對比驗證了此方法的正確性;2、針對一級渦輪進(jìn)出口流動情況,在改變一級渦輪的厚度,數(shù)量和進(jìn)口角度的基礎(chǔ)上模擬多種改型方案,找出一級渦輪的最佳改型方案,使得啟動工況下的轉(zhuǎn)矩比由3.9提高到4.12,在轉(zhuǎn)速比(0.3~0.703)工況下效率提高了2%~5%。3、根據(jù)二級渦輪的進(jìn)出口流動情況,在調(diào)整二級渦輪的進(jìn)口安放角的基礎(chǔ)上計算多種改型方案,從而確定二級渦輪的最佳改型方案,使得效率在轉(zhuǎn)速比(0.3~0.673)工況下比改型前提高了1%~2%;4、通過把一級渦輪和二級渦輪的最優(yōu)研究方案組合,進(jìn)行數(shù)值模擬計算并對計算結(jié)果進(jìn)行分析得出,啟動工況下,轉(zhuǎn)矩比由改進(jìn)前的3.9提高到4.16,在轉(zhuǎn)速比(0.3~0.703)工況下效率比改型前提高了3%~6%;通過對泵輪的出口的改型,使得泵輪出口的射流/尾流、回流、漩渦等不利流動特征得到了改善,根據(jù)數(shù)值模擬結(jié)果可以得出,啟動工況下,轉(zhuǎn)矩比由改進(jìn)前的3.9提高到4.28,在轉(zhuǎn)速比(0.3~0.646)工況下,效率較改進(jìn)前提高了4%~6.5%。
[Abstract]:Twin-turbine torque converter is more and more widely used in construction machinery industry. As one of the core components of hydraulic transmission system, improving the efficiency of hydraulic torque converter is the key. Based on the numerical calculation and analysis of the performance of the pump wheel, the first stage turbine and the second stage turbine, a variety of optimization modifications were carried out, and the results of modification were analyzed in detail. An optimal optimization scheme was obtained, which improved the torque ratio and efficiency of the double turbine torque converter. The geometric model of torque converter is established by SolidWorks modeling software. The geometric model is imported into Bladegen to establish the computational runner model. Then the numerical simulation is carried out by CFX software. According to the numerical simulation results, the pump wheel, the first turbine, the second turbine and the guide wheel are analyzed in detail under various speed ratios. The original characteristics of the twin-turbine torque converter are predicted and compared with the experimental results to verify the correctness of the method. 2. According to the inlet and outlet flow of the first-stage turbine, a variety of modification schemes are simulated on the basis of changing the thickness, quantity and inlet angle of the first-stage turbine, and the best modification scheme of the first-stage turbine is found. The torque ratio is increased from 3.9 to 4.12 under start-up condition, and the efficiency is increased by 2%~5% under speed ratio (0.3~0.703). 3. According to the inlet and outlet flow of the secondary turbine, various modification schemes are calculated on the basis of adjusting the inlet and outlet angle of the secondary turbine, so as to determine the best modification scheme of the secondary turbine and make the efficiency at the speed ratio (0.3~0.703). 4. By combining the optimal research scheme of the first stage turbine and the second stage turbine, the numerical simulation and analysis of the calculation results show that the torque ratio increases from 3.9 to 4.16, and the efficiency increases by 3% to 6% under the speed ratio (0.3 to 0.703). Through the modification of the outlet of the pump wheel, the unfavorable flow characteristics such as jet/wake, backflow and vortex at the outlet of the pump wheel are improved. According to the numerical simulation results, the torque ratio is increased from 3.9 to 4.28 under the starting condition, and the efficiency is increased by 4%-6.5% under the rotational speed ratio (0.3-0.646).
【學(xué)位授予單位】：河北工程大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU603

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 馬珂婧;何林;何立萍;陳明強(qiáng);;液力變矩器三維瞬態(tài)流場分析[J];現(xiàn)代機(jī)械;2016年02期

2 吳光強(qiáng);陳潔;;液力變矩器優(yōu)化設(shè)計研究現(xiàn)狀與展望[J];液壓與氣動;2016年04期

3 蔣勇;侯天強(qiáng);呂浩;劉光隆;;基于ANSYS-CFX的液力變矩器內(nèi)流場數(shù)值仿真分析[J];工程機(jī)械;2016年02期

4 劉城;閆清東;魏巍;;液力變矩器導(dǎo)輪葉片造型及優(yōu)化設(shè)計[J];哈爾濱工業(yè)大學(xué)學(xué)報;2016年01期

5 朱文杰;吳光強(qiáng);;扁平化液力變矩器循環(huán)圓設(shè)計及液力性能分析[J];機(jī)械傳動;2015年10期

6 王安麟;程偉;曹巖;劉偉國;;液力變矩器葉柵環(huán)向勻加速環(huán)量分配方法[J];華南理工大學(xué)學(xué)報(自然科學(xué)版);2015年09期

7 楊玨;崔薇;張文明;范慧方;;液力變矩器的循環(huán)圓設(shè)計[J];科學(xué)技術(shù)與工程;2015年03期

8 劉光隆;侯天強(qiáng);呂浩;蔣勇;;液力變矩器的系列化設(shè)計方法研究[J];工程機(jī)械;2014年11期

9 吳光強(qiáng);王立軍;;基于CFD的液力變矩器等效參數(shù)性能預(yù)測模型[J];同濟(jì)大學(xué)學(xué)報(自然科學(xué)版);2013年01期

10 馬文星;劉春寶;雷雨龍;劉偉輝;宋斌;;工程機(jī)械液力變矩器現(xiàn)代設(shè)計方法及應(yīng)用[J];液壓氣動與密封;2012年10期

，

本文編號：2246042