【作者】 邹涛；

【导师】 陈刚； 赵斌瑞；

【作者基本信息】 西安理工大学 ， 水利工程， 2007， 硕士

【摘要】 离心泵在国民经济各部门与日常生活中发挥着举足轻重的作用，本文以离心泵内部的三维流动为研究对象，应用适合于求解离心泵内部数值流动的有效算法，对离心泵内动静耦合的定常和非定常三维流动进行了详细的数值研究。主要完成以下几方面的工作：本文详细介绍了基于MDT的离心泵过流部件三维实体造型的求解方法及处理技术，并利用MDT三维实体造型技术软件建立了离心泵内部过流部件进口管、叶轮、蜗壳和扩散管的三维实体。进一步采用多块网格技术，根据离心泵结构特点，把复杂的离心泵结构划分成几个简单的块，采用对复杂结构适应性强的非结构化网格对计算域进行离散，然后采用网格生成软件完成离心泵过流部件内部的网格生成，为数值计算打下基础。采用Frozen-Rotor冻结转子模式和Rotor-Stator滑移界面模式系统开展了不同工况下离心泵内叶轮与蜗壳耦合的定常和非定常流动研究，结果表明由于叶轮与蜗壳的干扰蜗壳进口周向流动的不均匀性是非常强烈的，特别是叶轮与蜗舌间的相互干扰最为强烈，一直影响到叶轮进口和蜗壳扩散管出口的流场；在蜗壳内整个流动是以旋涡形式向出口推进的，并随着包角的变化旋涡表现出十分复杂的产生、发展和耗散的演化过程，导致蜗壳内较大的流动损失。更多还原

【Abstract】 The centrifugal pump is playing a very important role in every department of national economy and daily life. In this paper the numerical investigation on three-dimensional steady and unsteady rotor-stator interaction flow fields in a centrifugal pump were performed. The following aspects were studied mainly.The resolution methods and treatment technology of three-dimensional entity’s modeling of the through-flow components of the centrifugal pump based on MDT were introduced in detail in this paper and the three-dimensional entity’s modeling software based on MDT was utilized to create the three-dimensional entity of the through flow components of the pump include inlet tube, impeller, volute and diffuser.According to the structure characteristic of the through-flow components of the centrifugal pump and adopting multi-block grids generating technique further, the complicated centrifugal pump structure topology was divided into several simple blocks, and then the grids generating was achieved in these blocks of the centrifugal pump by adopting a unstructured grid generating software which has a good and strong adaptability to the complicated geometry. It is available to carry out numerical simulation and fluid dynamic analysis further.Based on Frozen-Rotor Approach and Rotor-Stator Approach, the numerical simulation was carried out in the centrifugal pump and the numerical results showed that the flow in the impeller and volute of centrifugal pump is periodically unsteady. Due to the interaction between impeller and volute the flow is characterized by pressure fluctuations and it is the strongest at impeller outlet and at the vicinity of the tongue. The unsteady pressure fluctuations are also one of the most important reasons to induce vibration and noise. Secondly, the flow field of the volute is characteristic of the vortex flow, and the vortex flow presents very complicated developing process which is creating, increasing and dissipating every now and then. All these lead to very large flow loss in the volute.更多还原