發(fā)布時間：2018-10-11 07:14

【摘要】：本文針對往復(fù)式壓縮機(jī)管網(wǎng)系統(tǒng)存在的氣流脈動,分別從理論分析、減脈的常用裝置、緩沖器模態(tài)與流場的分析幾個方面做了研究。文章首先介紹了研究往復(fù)式壓縮機(jī)管網(wǎng)系統(tǒng)脈動氣流傳遞的理論方法平面波動理論,并在平面波動理論的基礎(chǔ)上由管道系統(tǒng)中的結(jié)構(gòu)單元出發(fā),推導(dǎo)出脈動氣流在復(fù)雜管道系統(tǒng)中的傳遞矩陣。對于在平面波動方程基礎(chǔ)上得到的傳遞矩陣,使用有限元分析軟件Ansys中的聲學(xué)模態(tài)分析的方法驗證了傳遞矩陣的精確性。其次,對傳統(tǒng)的緩沖器進(jìn)出口接管的方式做了改進(jìn),研究切向進(jìn)口緩沖器及徑向進(jìn)口緩沖器在壓縮機(jī)不同出口壓力條件下對壓力波動的減弱效果。分析不同進(jìn)口緩沖器內(nèi)部流場,比較各自流場流體跡線規(guī)律特點,得出影響減脈性能的流動機(jī)理。運用Fluent建立緩沖器及相關(guān)接管模型,根據(jù)實驗所測的緩沖器進(jìn)出口壓力作為邊界條件進(jìn)行數(shù)值模擬計算。結(jié)果表明在不同壓力等級下,緩沖器出口的脈動幅度減小程度基本一致,且切向進(jìn)口向緩沖器減小壓力脈動的效果更優(yōu)。最后,從不同進(jìn)口方式緩沖器性能存在差異出發(fā),結(jié)合緩沖器內(nèi)部流場與流體不同的跡線,聯(lián)系流體流動的納維斯托克斯方程與推導(dǎo)傳遞矩陣法的平面波動方程,比較理論計算的傳遞矩陣法與流體流動方程所忽略的影響因素,即流體介質(zhì)在實際管網(wǎng)流動過程中由于結(jié)構(gòu)因素所產(chǎn)生的流體在局部的回流、擴(kuò)散、沖擊等造成的能量損失。鑒于此,文章提出計算管網(wǎng)氣流脈動的兩步法：依照傳遞矩陣的理論方法得出在管道不同位置的壓力脈動值,這個值是在幾點假設(shè)后由簡化的傳遞模型得到的,第二步即考慮流體流動的動力學(xué)性能造成的影響,把過程中存在的能量損失添加到傳遞矩陣法計算得到的氣流的脈動參數(shù)值中去,這與工程實際中的值會更加接近。
[Abstract]:In this paper, the flow pulsation of reciprocating compressor pipe network system is studied from several aspects, such as theoretical analysis, common device of reducing pulse, mode of buffer and analysis of flow field. This paper first introduces the theoretical method to study the pulsating air flow transfer of the reciprocating compressor pipe network system, and based on the plane wave theory, it starts from the structural unit in the pipeline system. The transfer matrix of pulsating airflow in complex pipeline system is derived. For the transfer matrix based on the plane wave equation, the accuracy of the transfer matrix is verified by using the acoustic modal analysis method in the finite element analysis software Ansys. Secondly, the traditional way of inlet and outlet nozzle of buffer is improved, and the weakening effect of tangential inlet buffer and radial inlet buffer on pressure fluctuation under different outlet pressure of compressor is studied. The internal flow field of different inlet buffers is analyzed, and the characteristics of the flow trace are compared, and the flow mechanism that affects the performance of pulse reduction is obtained. The model of buffer and related nozzle was established by Fluent, and the inlet and outlet pressure of buffer was numerically simulated according to the boundary condition measured in the experiment. The results show that the amplitude of pulsation at the outlet of the buffer is basically the same at different pressure levels, and the effect of tangential inlet to the buffer is better. Finally, starting from the difference of the performance of different inlet buffers, combining the different traces of flow field and fluid in the buffer, the Navistoks equation of fluid flow and the plane wave equation derived from the transfer matrix method are connected. The transfer matrix method is compared with the influence factors neglected by the fluid flow equation, that is, the energy loss caused by the local flow, diffusion and impact of the fluid produced by the structural factors in the actual pipe network flow process. In view of this, a two-step method for calculating the flow pulsation of pipe network is proposed: according to the theoretical method of transfer matrix, the pressure pulsation value at different locations of the pipeline is obtained by a simplified transfer model after several hypotheses. In the second step, considering the influence of the dynamic performance of the fluid flow, the energy loss in the process is added to the pulsating parameter value of the airflow calculated by the transfer matrix method, which will be closer to the value in the engineering practice.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TH45

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本文編號：2263320