长、短叶片式离心压缩机的优化与CFD分析

发布时间：2018-04-30 03:28

本文选题：离心压缩机 + CFD　；参考：《华中科技大学》2011年硕士论文

【摘要】：离心式压缩机有流量小、功率低、压力大、转速高、可靠性高等优点，在能源、化工、航空等领域有着越来越广泛的应用。现在的离心压缩机朝着小尺寸、高压比、高效率、低能耗方向发展，使得其设计要求越来越严格。在性能较高的离心压缩机叶轮中，普遍采用长、短叶片形式，其压比、效率等各项性能指标倍受人们的关注。为进一步开发更高性能的离心压缩机，需要深入研究叶轮机械内部的流动性能。在这一背景下，本文采用CFD技术对一个多级离心压缩机首级的内部流场进行了模拟，研究叶轮各几何参数对离心压缩机级性能的影响。文章主要分为5个部分，具体内容如下：首先介绍了课题的研究背景、目的及意义，论述了离心压缩机数值模拟以及实验研究的国内外进展情况;其次论述了数学计算方法，包括CFD一般的求解过程、目前应用较广泛的几种商用CFD软件。并结合FLUENT软件对叶轮机械内部流场计算的基本控制方程、湍流模型、网格划分技术、计算边界条件的设置等作了分析;然后给出了本文研究的离心压缩机模型和数值计算方法，为了验证本文计算方法的可靠性，对几何结构类似的叶轮进行了数值计算并与其实验值进行了对比，分析表明：本文计算方法是可靠的。本文运用了两种方法进行变型设计。第一种是通过改变长、短叶片的相对位置对叶轮部分进行了变型设计，对5种不同形式叶轮进行数值计算，对比了其外部性能和内部流场，为长、短叶片形式的离心压缩机的设计提供参考;第二种是通过叶轮外径切削的方法，，对3种不同的子午面型线叶轮进行模拟，为离心压缩机模型级的拓展和快速开发提供参考。
[Abstract]:Centrifugal compressor has many advantages, such as low flow rate, low power, high pressure, high speed and high reliability. It is widely used in the fields of energy, chemical industry, aviation and so on. The centrifugal compressor is developing towards the direction of small size, high pressure ratio, high efficiency and low energy consumption, which makes its design requirements more and more stringent. In the centrifugal compressor impeller with high performance, the long and short blades are widely used, the pressure ratio and the efficiency of the impeller are paid more and more attention. In order to further develop the centrifugal compressor with higher performance, it is necessary to study the internal fluidity of impeller machinery. Under this background, the internal flow field of a multistage centrifugal compressor is simulated by CFD technique, and the influence of various geometric parameters of impeller on the performance of centrifugal compressor stage is studied. The article is divided into five parts, the specific contents are as follows: Firstly, the research background, purpose and significance of the subject are introduced, and the progress of numerical simulation and experimental research of centrifugal compressor is discussed. Secondly, the mathematical calculation method, including the general solving process of CFD, is discussed. At present, several commercial CFD software are widely used. The basic governing equation, turbulence model, meshing technology and the setting of boundary conditions of the internal flow field calculation of impeller machinery are analyzed with FLUENT software, and the centrifugal compressor model and numerical calculation method studied in this paper are given. In order to verify the reliability of this method, the numerical calculation of impeller with similar geometric structure is carried out and compared with the experimental data. The analysis shows that the method is reliable. In this paper, two methods are used for variant design. The first is to modify the impeller part by changing the relative position of the long and short blades, and numerically calculate five different types of impellers, and compare their external performance and internal flow field. The design of centrifugal compressor with short blade form is provided with reference; the second is to simulate three different meridional profile impellers by cutting the outer diameter of impeller, which provides a reference for the expansion and rapid development of model stage of centrifugal compressor.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH452

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