發(fā)布時(shí)間：2018-05-13 22:19

  本文選題：液力變矩器 + 葉片數(shù)��； 參考：《長(zhǎng)安大學(xué)》2017年碩士論文

【摘要】：液力變矩器作為液力傳動(dòng)的重要元件之一,在自動(dòng)變速器中得到了廣泛應(yīng)用。在對(duì)液力變矩器進(jìn)行設(shè)計(jì)時(shí),最核心的部分就是葉柵系統(tǒng),其設(shè)計(jì)的好壞直接影響著液力變矩器的使用性能。葉柵系統(tǒng)參數(shù)主要包括葉片進(jìn)口角、出口角、葉片數(shù)以及循環(huán)圓等參數(shù)。本文以某型號(hào)液力變矩器為研究對(duì)象,以CFD為載體,研究分析了葉片數(shù)和葉片進(jìn)、出口角度對(duì)液力變矩器性能的影響。首先分析了液力變矩器三個(gè)工作輪的工作特性,根據(jù)能量平衡建立了液力變矩器的數(shù)學(xué)模型,并對(duì)其靜態(tài)特性進(jìn)行了分析。借助三坐標(biāo)激光掃描儀得到了液力變矩器的各工作輪的整體點(diǎn)云和流道點(diǎn)云數(shù)據(jù),通過(guò)Imageware的后處理和UG的三維造型得到了液力變矩器的三維實(shí)體模型。將簡(jiǎn)化后的流道模型導(dǎo)入ICEM進(jìn)行網(wǎng)格劃分,并運(yùn)用CFD軟件FLUENT進(jìn)行三維流場(chǎng)數(shù)值模擬。在高速比工況下,對(duì)不同工作輪(泵輪、渦輪、導(dǎo)輪)葉片數(shù)的液力變矩器進(jìn)行三維流場(chǎng)數(shù)值模擬,得到了各工作輪進(jìn)出口面的速度和壓力變化并分析了原因,同時(shí)根據(jù)三維流場(chǎng)的計(jì)算結(jié)果分析了不同工作輪葉片數(shù)對(duì)液力變矩器特性的影響。對(duì)各個(gè)工作輪葉片數(shù)進(jìn)行了合理組合并選取四種典型方案進(jìn)行分析研究,并將計(jì)算結(jié)果與實(shí)驗(yàn)對(duì)比,驗(yàn)證了三維流場(chǎng)計(jì)算結(jié)果的準(zhǔn)確性。將不同葉片數(shù)組合的變矩器性能進(jìn)行對(duì)比分析,得到了不同葉片數(shù)組合對(duì)液力變矩器性能的影響。根據(jù)液力變矩器的數(shù)學(xué)模型,研究了不同轉(zhuǎn)速比時(shí)葉片角度對(duì)變矩器性能參數(shù)的影響。高速比工況下通過(guò)三維流場(chǎng)數(shù)值模擬,得到了不同進(jìn)、出口角度時(shí)各工作輪進(jìn)、出口面的速度和壓力分布的差異并闡明了原因。鑒于導(dǎo)輪和泵輪出口角對(duì)變矩器性能影響較大,根據(jù)三維流場(chǎng)計(jì)算結(jié)果對(duì)泵輪和導(dǎo)輪不同出口角時(shí)變矩器的特性進(jìn)行了對(duì)比分析,得到了出口角的變化對(duì)變矩器性能的影響。
[Abstract]:As one of the important components of hydraulic transmission, hydraulic torque converter has been widely used in automatic transmission. In the design of hydraulic torque converter, the most important part is cascade system, whose design directly affects the performance of hydraulic torque converter. The parameters of cascade system mainly include blade inlet angle, outlet angle, blade number and cycle circle. In this paper, the influence of blade number, blade inlet and outlet angle on the performance of hydraulic torque converter is studied with a certain type of hydraulic torque converter as the research object and CFD as the carrier. Firstly, the working characteristics of three working wheels of hydraulic torque converter are analyzed. According to the energy balance, the mathematical model of hydraulic torque converter is established, and its static characteristics are analyzed. The data of the whole point cloud and the flow path point cloud of each working wheel of the torque converter are obtained by means of the 3D laser scanner. The 3D solid model of the hydraulic torque converter is obtained by the post-processing of Imageware and the 3D modeling of UG. The simplified flow channel model is imported into ICEM to mesh and the 3D flow field is simulated by CFD software FLUENT. Under the condition of high speed ratio, the flow field of hydraulic torque converter with different blades of pump wheel, turbine and guide wheel is numerically simulated, and the velocity and pressure changes of the inlet and outlet surfaces of each working wheel are obtained and the reasons are analyzed. At the same time, the influence of the number of blades on the characteristics of hydraulic torque converter is analyzed according to the results of three-dimensional flow field. The number of blades of each working wheel is reasonably combined and four typical schemes are selected for analysis and study. The results of calculation are compared with those of experiments to verify the accuracy of the results of three-dimensional flow field calculation. The performance of torque converter with different blade number combinations is compared and analyzed, and the effect of different blade number combinations on the performance of hydraulic torque converter is obtained. According to the mathematical model of hydraulic torque converter, the influence of blade angle on the performance parameters of torque converter with different rotational speed ratio is studied. The difference of velocity and pressure distribution at different inlet and outlet angles is obtained by numerical simulation of three dimensional flow field under high speed ratio. In view of the great influence of the outlet angle of the guide wheel and the pump wheel on the performance of the torque converter, the characteristics of the time-varying moment converter at different outlet angles of the pump wheel and the guide wheel are compared and analyzed according to the results of three-dimensional flow field calculation, and the influence of the change of the outlet angle on the performance of the converter is obtained.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TH137.332

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