液力变矩器逆向造型及流场数值分析

发布时间：2018-09-06 19:55

【摘要】：随着大功率、高转速机泵设备的发展,研发适用于机泵等流体机械的调速设备成为节能的有效途径。液力行星齿轮复合传动装置具有传递功率大、效率高、寿命长以及无级调速等优点,主要用于大型机泵的调速节能。液力行星齿轮复合传动装置调速和控制的核心部件是导叶可调式液力变矩器,目前我国拥有性能良好的导叶可调式液力变矩器水力模型较少,不能满足高端技术产品研发的要求。本文以某型号液力变矩器为研究对象,采用逆向造型技术对变矩器泵轮叶片进行三维模型构建,并利用CFX软件对变矩器内流场进行数值计算,探究了变矩器流场特性,在此基础上对泵轮叶片进行优化设计,研究了变矩器流场压力脉动规律。首先,本文使用Pro/e软件对变矩器泵轮叶片进行了逆向造型,并使用Bladegen软件对得到的泵轮叶片进行平滑与修型处理。其次,基于变矩器流场定常计算结果,分析了变矩器各叶轮流场特性,在此基础上,研究泵轮进、出口叶片角对变矩器特性的影响以及改型为柱面叶片变矩器特性变化。结果表明,泵轮叶片出口角改为95°时,最优工况时变矩器效率提高0.66%,起动工况变矩系数提高1.03%;过流断面轴面速度按反势流分布规律对泵轮叶片进口角进行优化时,低速比(i=0.3)工况变矩器效率提高3.8%;泵轮叶片改型为柱面叶片,导叶开度30%、速比i=0.3时,变矩器效率比原模型提高1.2%,泵轮力矩系数降低0.96%,最优工况改型前后效率变化不大,泵轮力矩系数降低12%。最后,对变矩器流场进行非定常计算,分析各叶轮流场压力脉动规律,得出在牵引工况时,速比越大,压力脉动幅值越小,频率越低;而超越制动工况则相反,速比越大,压力脉动幅值越大,频率越高;泵轮出口及涡轮进口附近流场压力脉动严重,表明泵轮、涡轮动静干涉严重。
[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 掳, 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.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH137.332

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