低转速比可调式液力变矩器优化设计研究
发布时间：2019-07-05 20:20
【摘要】：大功率液力机械调速系统具有成本低、寿命长的优点，并且可以在较恶劣的环境下工作，应用在风力发电传动装置上实现自动控制，可以保证输出转速不变，从而使用同步电机。风力发电液力机械传动装置需要变矩器的高效区范围宽，设计转速比低。国内的低转速比可调式变矩器尚没有成型产品，仅有一种低转速比离心涡轮液力变矩器，即NY5型起动液力变矩器。但该变矩器效率较低，高效区范围窄，应用在风力发电液力机械传动会使得整套装置效率较低。本文将对该变矩器进行优化，提高其最高效率和高效区范围，将其二级导轮改成可调导轮，设计成可调式变矩器。 本文使用数值模拟计算方法对NY5型起动液力变矩器进行优化设计。先对NY5型起动液力变矩器进行建模划分网格定义物理条件，进行流场计算提取结果，和实验结果对比分析，验证了数值模拟结果的准确程度。再分两步进行优化：第一步将一级导轮的柱状叶片改为空间扭曲叶片，并分析改后的流场结构，分析出现一些流场状态较差例如回流，脱流的原因；第二步，针对第一次改后的结果确定叶栅改型方案，即改变一级涡轮、二级涡轮的叶片角以及重新设计二级导轮的叶型，并对优化后的变矩器进行计算，对比优化前后的流场分析优化效果。 本文确定了可调导轮的旋转轴和最大开度导叶所处位置。在确定可调导轮的参数之后本文对100%开度，，84%开度，60%开度下变矩器进行不同工况的计算模拟，分析流场特性。最后分别应用一元流计算方法和数值模拟计算可调式变矩器的轴向力，对轴向力计算的方法进行了探讨，对比两者所得的结果，为轴承选型提供参考，并给出减小轴向力的方法。 通过本文设计的可调式变矩器最高效率为82.2%，高效区范围达到了2.26，适合用于风力发电传动装置上。优化过程中发现了造成基型变矩器效率较低的原因是一级涡轮进口处液流的偏离以及二级导轮入口处较大的冲击损失。
文内图片：
图片说明：行星齿轮速度叠加原理
[Abstract]:High power hydraulic mechanical speed regulation system has the advantages of low cost and long life, and can work in harsh environment. It can be used in wind power transmission to realize automatic control, which can ensure that the output speed remains unchanged, so that synchronous motor can be used. The hydraulic mechanical transmission of wind power generation needs the high efficiency range of torque converter and the design speed ratio is low. There is no molding product of adjustable torque converter with low speed ratio in China, and there is only one kind of centrifugal turbine torque converter with low speed ratio, that is, NY5 starting torque converter. However, the efficiency of the torque converter is low and the range of high efficiency area is narrow. The application of the torque converter in the hydraulic mechanical transmission of wind power generation will make the efficiency of the whole device lower. In this paper, the torque converter is optimized to improve its maximum efficiency and high efficiency range, and its two-stage guide wheel is changed into adjustable guide wheel, and an adjustable torque converter is designed. In this paper, the numerical simulation method is used to optimize the design of NY5 starting hydraulic torque converter. Firstly, the NY5 starting hydraulic torque converter is modeled and divided into grid to define the physical conditions, and the flow field calculation and extraction results are carried out. The results are compared with the experimental results, and the accuracy of the numerical simulation results is verified. Then the optimization is carried out in two steps: the first step is to change the cylindrical blade of the first guide wheel into the spatial twisted blade, and to analyze the structure of the modified flow field, and to analyze the causes of some poor flow field states, such as reflux and deflow. In the second step, according to the results of the first modification, the cascade modification scheme is determined, that is, the blade angle of the first turbine and the secondary turbine is changed and the blade shape of the secondary guide wheel is redesigned, and the optimized torque converter is calculated, and the optimization effect of the flow field analysis before and after optimization is compared. In this paper, the position of the rotating shaft and the maximum opening guide vane of the adjustable guide wheel is determined. After determining the parameters of the adjustable guide wheel, the torque converter with 100% opening, 84% opening and 60% opening is calculated and simulated under different operating conditions, and the flow field characteristics are analyzed. Finally, the method of calculating axial force of adjustable torque converter is discussed by using single flow calculation method and numerical simulation respectively. the results obtained by the two methods are compared to provide reference for bearing selection, and the method of reducing axial force is given. The maximum efficiency of the adjustable torque converter designed in this paper is 82.2%, and the range of high efficiency area is 2.26, which is suitable for wind power transmission. In the process of optimization, it is found that the low efficiency of the base torque converter is due to the deviation of liquid flow at the inlet of the first turbine and the large impact loss at the entrance of the two-stage guide wheel.
【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】：2012
【分类号】：TH137.332
本文编号：2510786
文内图片：
图片说明：行星齿轮速度叠加原理
[Abstract]:High power hydraulic mechanical speed regulation system has the advantages of low cost and long life, and can work in harsh environment. It can be used in wind power transmission to realize automatic control, which can ensure that the output speed remains unchanged, so that synchronous motor can be used. The hydraulic mechanical transmission of wind power generation needs the high efficiency range of torque converter and the design speed ratio is low. There is no molding product of adjustable torque converter with low speed ratio in China, and there is only one kind of centrifugal turbine torque converter with low speed ratio, that is, NY5 starting torque converter. However, the efficiency of the torque converter is low and the range of high efficiency area is narrow. The application of the torque converter in the hydraulic mechanical transmission of wind power generation will make the efficiency of the whole device lower. In this paper, the torque converter is optimized to improve its maximum efficiency and high efficiency range, and its two-stage guide wheel is changed into adjustable guide wheel, and an adjustable torque converter is designed. In this paper, the numerical simulation method is used to optimize the design of NY5 starting hydraulic torque converter. Firstly, the NY5 starting hydraulic torque converter is modeled and divided into grid to define the physical conditions, and the flow field calculation and extraction results are carried out. The results are compared with the experimental results, and the accuracy of the numerical simulation results is verified. Then the optimization is carried out in two steps: the first step is to change the cylindrical blade of the first guide wheel into the spatial twisted blade, and to analyze the structure of the modified flow field, and to analyze the causes of some poor flow field states, such as reflux and deflow. In the second step, according to the results of the first modification, the cascade modification scheme is determined, that is, the blade angle of the first turbine and the secondary turbine is changed and the blade shape of the secondary guide wheel is redesigned, and the optimized torque converter is calculated, and the optimization effect of the flow field analysis before and after optimization is compared. In this paper, the position of the rotating shaft and the maximum opening guide vane of the adjustable guide wheel is determined. After determining the parameters of the adjustable guide wheel, the torque converter with 100% opening, 84% opening and 60% opening is calculated and simulated under different operating conditions, and the flow field characteristics are analyzed. Finally, the method of calculating axial force of adjustable torque converter is discussed by using single flow calculation method and numerical simulation respectively. the results obtained by the two methods are compared to provide reference for bearing selection, and the method of reducing axial force is given. The maximum efficiency of the adjustable torque converter designed in this paper is 82.2%, and the range of high efficiency area is 2.26, which is suitable for wind power transmission. In the process of optimization, it is found that the low efficiency of the base torque converter is due to the deviation of liquid flow at the inlet of the first turbine and the large impact loss at the entrance of the two-stage guide wheel.
【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】：2012
【分类号】：TH137.332
【参考文献】
相关期刊论文 前10条
1 洪汉池;马朝臣;;车用涡轮增压器轴向力数值计算[J];车辆与动力技术;2006年02期
2 董泳 ,张奇峰 ,闫国军;基型参照的液力变矩器叶栅系统优化设计方法研究[J];工程机械;2003年10期
3 陈曙光;吴光强;王欢;;液力变矩器叶栅参数的优化研究[J];工程机械;2008年08期
4 何平;孙志刚;郭宝亭;谭春青;;开式向心涡轮背部间隙流动特性的研究[J];工程热物理学报;2011年08期
5 潘彦平,余志勇,Andreas Fecht;高效变速液力驱动[J];国外石油机械;1997年01期
6 董泳;闫国军;周绪强;;多级液力变速传动装置的工作特性与功率分流原理分析[J];机床与液压;2008年10期
7 刘春宝;马文星;许睿;;液力变矩器轴向力的CFD计算与分析[J];吉林大学学报(工学版);2009年05期
8 黄建勋;吴光强;王立军;;液力变矩器轴向力计算与优化[J];佳木斯大学学报(自然科学版);2012年01期
9 蒲朝阳;袁辉;高岗荣;安许良;;高压注浆泵用可调式液力变矩器的研制[J];煤炭科学技术;2010年05期
10 洪汉池;胡辽平;黄红武;吴金镇;;车用涡轮增压器转子轴向力试验研究[J];农业装备与车辆工程;2010年04期
本文编号：2510786
本文链接：https://www.wllwen.com/kejilunwen/jixiegongcheng/2510786.html
