本文選題：離心壓縮機(jī) + CFD��； 參考：《華中科技大學(xué)》2011年碩士論文

【摘要】：離心式壓縮機(jī)有流量小、功率低、壓力大、轉(zhuǎn)速高、可靠性高等優(yōu)點(diǎn)，在能源、化工、航空等領(lǐng)域有著越來(lái)越廣泛的應(yīng)用�，F(xiàn)在的離心壓縮機(jī)朝著小尺寸、高壓比、高效率、低能耗方向發(fā)展，使得其設(shè)計(jì)要求越來(lái)越嚴(yán)格。在性能較高的離心壓縮機(jī)葉輪中，普遍采用長(zhǎng)、短葉片形式，其壓比、效率等各項(xiàng)性能指標(biāo)倍受人們的關(guān)注。為進(jìn)一步開(kāi)發(fā)更高性能的離心壓縮機(jī)，需要深入研究葉輪機(jī)械內(nèi)部的流動(dòng)性能。在這一背景下，本文采用CFD技術(shù)對(duì)一個(gè)多級(jí)離心壓縮機(jī)首級(jí)的內(nèi)部流場(chǎng)進(jìn)行了模擬，研究葉輪各幾何參數(shù)對(duì)離心壓縮機(jī)級(jí)性能的影響。文章主要分為5個(gè)部分，具體內(nèi)容如下： 首先介紹了課題的研究背景、目的及意義，論述了離心壓縮機(jī)數(shù)值模擬以及實(shí)驗(yàn)研究的國(guó)內(nèi)外進(jìn)展情況;其次論述了數(shù)學(xué)計(jì)算方法，包括CFD一般的求解過(guò)程、目前應(yīng)用較廣泛的幾種商用CFD軟件。并結(jié)合FLUENT軟件對(duì)葉輪機(jī)械內(nèi)部流場(chǎng)計(jì)算的基本控制方程、湍流模型、網(wǎng)格劃分技術(shù)、計(jì)算邊界條件的設(shè)置等作了分析;然后給出了本文研究的離心壓縮機(jī)模型和數(shù)值計(jì)算方法，為了驗(yàn)證本文計(jì)算方法的可靠性，對(duì)幾何結(jié)構(gòu)類(lèi)似的葉輪進(jìn)行了數(shù)值計(jì)算并與其實(shí)驗(yàn)值進(jìn)行了對(duì)比，分析表明：本文計(jì)算方法是可靠的。 本文運(yùn)用了兩種方法進(jìn)行變型設(shè)計(jì)。第一種是通過(guò)改變長(zhǎng)、短葉片的相對(duì)位置對(duì)葉輪部分進(jìn)行了變型設(shè)計(jì)，對(duì)5種不同形式葉輪進(jìn)行數(shù)值計(jì)算，對(duì)比了其外部性能和內(nèi)部流場(chǎng)，為長(zhǎng)、短葉片形式的離心壓縮機(jī)的設(shè)計(jì)提供參考;第二種是通過(guò)葉輪外徑切削的方法，，對(duì)3種不同的子午面型線葉輪進(jìn)行模擬，為離心壓縮機(jī)模型級(jí)的拓展和快速開(kāi)發(fā)提供參考。
[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.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類(lèi)號(hào)】：TH452

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