微型双击式水轮机流场数值仿真

发布时间：2018-08-08 16:39

【摘要】：能源是经济的命脉，在社会可持续发展中起着举足轻重的作用。然而，能源的消耗却在持续增长，不可再生资源也日益枯竭。为缓解这一问题，许多学者陆续对节能方式和方法进行了研究和开发。生活工作中浪费掉很多水动力，其实这些水动力可以通过微型的水轮机进行发电，作为一些耗电设备的电源充电器，这样就可以达到节能的目的。本文主要是根据水轮机的工作原理和传统双击式水轮机过流部件的设计方法，通过solidworks建立微型双击式水轮机的三维模型。由于现有条件的限制，在对三维模型进行数值模拟之前，利用gambit对微型双击式水轮机进行二维制图，先对二维模型进行数值模拟。在二维模拟的基础之上，对三维模型进行数值模拟。在运用fluent对二维模型进行数值模拟时，主要通过改变水轮机的部分参数和结构来研究该微型双击式水轮机的性能。在二维的研究基础之上，为进一步验证微型双击式水轮机的性能，在本文最后，对建立的三维微型双击式水轮机的几何模型进行数值模拟。对三维模型进行数值模拟时，采用同样的边界条件设置。本文经过大量的工作，通过模拟计算可以得出：（1）通过改变微型双击式水轮机的入口总压，得到水轮机的效率随入口压力的变化，并说明该微型双击式水轮机适合在40000Pa-120000Pa压力下工作。（2）通过改变微型双击式水轮机的叶片个数，可以得到水轮机的效率随叶片个数的变化情况，以及本文设定的微型双击式水轮机在叶片个数为18时，水轮机的效率达到最优。（3）通过改变水轮机的叶型，，得出水轮机效率相对叶片类型的变化趋势。在设计中可以探索通过水轮机的叶片类型，增加水轮机的效率。（4）改变微型双击式水轮机的转速，得出该微型双击式水轮机的转速特性曲线，以及最佳转速。（5）本微型双击式水轮机相比实际研究应用中的水电双击式水轮机的效率要低一些，主要是因为数值模拟的局限性、几何模型结构等一些因数影响。
[Abstract]:Energy is the lifeblood of economy and plays an important role in the sustainable development of society. However, energy consumption continues to grow and non-renewable resources are increasingly depleted. In order to alleviate this problem, many scholars have carried on the research and the development to the energy saving way and the method one after another. Life and work waste a lot of hydrodynamic power, in fact, these hydrodynamic power can be generated through a miniature turbine, as a power charger for some power consumption equipment, so as to achieve the purpose of energy saving. According to the working principle of the turbine and the design method of the traditional overflowing parts of the double-hammer turbine, the three-dimensional model of the micro-double-hammer turbine is established by solidworks in this paper. Due to the limitation of the existing conditions, before the 3D model is simulated, gambit is used to carry out the two-dimensional mapping of the micro-double-click turbine, and the two-dimensional model is numerically simulated. On the basis of two-dimensional simulation, the three-dimensional model is numerically simulated. In the numerical simulation of the two-dimensional model with fluent, the performance of the micro-double-tap turbine is studied by changing some parameters and structure of the turbine. Based on the two-dimensional research, in order to further verify the performance of the micro-double-hammer turbine, in the end of this paper, the geometric model of the three-dimensional micro-double-hammer turbine is numerically simulated. The same boundary conditions are used in the numerical simulation of the three-dimensional model. After a lot of work and simulation, the following conclusions can be obtained: (1) by changing the total inlet pressure of the micro-double-tap turbine, the efficiency of the turbine varies with the inlet pressure. It is also shown that the micro-double-tap turbine is suitable for working under 40000Pa-120000Pa pressure. (2) by changing the number of blades of the micro-double-tap turbine, the variation of turbine efficiency with the number of blades can be obtained. The turbine efficiency is optimized when the number of blades is 18:00. (3) the variation trend of turbine efficiency relative to blade type is obtained by changing the blade shape of the turbine. In the design, it can be explored to increase the efficiency of the turbine through the blade type of the turbine. (4) changing the speed of the micro-double-tap turbine, the speed characteristic curve of the micro-double-tap turbine can be obtained. (5) the efficiency of the micro double-hammer turbine is lower than that of the practical application, mainly because of the limitation of numerical simulation and the structure of geometric model.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TK735.3

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