【摘要】：隨著大功率、高轉(zhuǎn)速機(jī)泵設(shè)備的發(fā)展,研發(fā)適用于機(jī)泵等流體機(jī)械的調(diào)速設(shè)備成為節(jié)能的有效途徑。液力行星齒輪復(fù)合傳動裝置具有傳遞功率大、效率高、壽命長以及無級調(diào)速等優(yōu)點(diǎn),主要用于大型機(jī)泵的調(diào)速節(jié)能。液力行星齒輪復(fù)合傳動裝置調(diào)速和控制的核心部件是導(dǎo)葉可調(diào)式液力變矩器,目前我國擁有性能良好的導(dǎo)葉可調(diào)式液力變矩器水力模型較少,不能滿足高端技術(shù)產(chǎn)品研發(fā)的要求。本文以某型號液力變矩器為研究對象,采用逆向造型技術(shù)對變矩器泵輪葉片進(jìn)行三維模型構(gòu)建,并利用CFX軟件對變矩器內(nèi)流場進(jìn)行數(shù)值計(jì)算,探究了變矩器流場特性,在此基礎(chǔ)上對泵輪葉片進(jìn)行優(yōu)化設(shè)計(jì),研究了變矩器流場壓力脈動規(guī)律。首先,本文使用Pro/e軟件對變矩器泵輪葉片進(jìn)行了逆向造型,并使用Bladegen軟件對得到的泵輪葉片進(jìn)行平滑與修型處理。其次,基于變矩器流場定常計(jì)算結(jié)果,分析了變矩器各葉輪流場特性,在此基礎(chǔ)上,研究泵輪進(jìn)、出口葉片角對變矩器特性的影響以及改型為柱面葉片變矩器特性變化。結(jié)果表明,泵輪葉片出口角改為95°時,最優(yōu)工況時變矩器效率提高0.66%,起動工況變矩系數(shù)提高1.03%;過流斷面軸面速度按反勢流分布規(guī)律對泵輪葉片進(jìn)口角進(jìn)行優(yōu)化時,低速比(i=0.3)工況變矩器效率提高3.8%;泵輪葉片改型為柱面葉片,導(dǎo)葉開度30%、速比i=0.3時,變矩器效率比原模型提高1.2%,泵輪力矩系數(shù)降低0.96%,最優(yōu)工況改型前后效率變化不大,泵輪力矩系數(shù)降低12%。最后,對變矩器流場進(jìn)行非定常計(jì)算,分析各葉輪流場壓力脈動規(guī)律,得出在牽引工況時,速比越大,壓力脈動幅值越小,頻率越低;而超越制動工況則相反,速比越大,壓力脈動幅值越大,頻率越高;泵輪出口及渦輪進(jìn)口附近流場壓力脈動嚴(yán)重,表明泵輪、渦輪動靜干涉嚴(yán)重。
[Abstract]:With the development of high power and high speed pump equipment, it is an effective way to develop the speed regulating equipment suitable for fluid machinery such as pump. The hydraulic planetary gear compound transmission device has the advantages of high transmission power, high efficiency, long life and stepless speed regulation, etc. It is mainly used for the speed regulation and energy saving of the mainframe pump. The key component of the speed regulation and control of the hydraulic planetary gear compound drive device is the guide vane adjustable hydraulic torque converter. At present, there are few hydraulic models of the guide vane adjustable hydraulic torque converter in our country. Can not meet the high-end technical product R & D requirements. This paper takes a certain type of hydraulic torque converter as the research object, uses the reverse modeling technology to construct the three-dimensional model of the torque converter pump blade, and uses CFX software to numerically calculate the flow field in the torque converter, and probes into the flow field characteristics of the torque converter. On this basis, the flow field pressure pulsation of the torque converter is studied by optimizing the design of the pump blade. Firstly, this paper uses Pro/e software to carry on the reverse modeling to the torque converter pump vane, and uses the Bladegen software to carry on the smooth and the modification processing to the obtained pump wheel blade. Secondly, based on the steady calculation results of the torque converter flow field, the flow field characteristics of each impeller of the torque converter are analyzed. On this basis, the influence of the inlet and outlet vane angle of the pump on the torque converter characteristics and the change of the modified cylinder blade torque converter characteristics are studied. The results show that when the outlet angle of the pump wheel blade is changed to 95 擄, the efficiency of the time-varying moment converter in the optimal working condition is increased by 0.66 and the torque coefficient of the starting condition is increased by 1.03.The axial velocity of the cross flow section is optimized according to the distribution law of the reverse potential flow, and the inlet angle of the pump wheel blade is optimized according to the distribution law of the reverse potential flow. The efficiency of torque converter under low speed ratio (I / O 0.3) is increased by 3.8. when the impeller blade is modified to cylindrical blade, the guide vane is 30, and the speed ratio is 0.3, the torque converter efficiency is 1.2 higher than that of the original model, the torque coefficient of pump wheel is reduced by 0.96, and the efficiency before and after the modification of the optimal working condition is not changed much. The torque coefficient of pump wheel is reduced by 12. Finally, the unsteady calculation of the flow field of the torque converter is carried out, and the law of pressure pulsation in each impeller flow field is analyzed. It is concluded that the greater the speed ratio, the smaller the amplitude of pressure pulsation and the lower the frequency, while the higher the speed ratio is, the higher the speed ratio is. The greater the amplitude of pressure pulsation, the higher the frequency, and the more serious the pressure fluctuation in the flow field near the outlet of pump wheel and the inlet of turbine, which indicates that the static and static interference of pump wheel is serious.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TH137.332

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本文編號：2227382