發(fā)布時間：2018-08-12 18:06

【摘要】：離心壓縮機作為核心設備廣泛應用于石油天然氣、大型煤化工以及深海油氣開采等領域。離心壓縮機性能的高低直接影響整套裝置經濟效益，安全運行以及可靠性�，F(xiàn)階段隨著經濟快速發(fā)展，資源消耗、環(huán)境惡化等問題日趨嚴重。所以如何保持壓縮機安全穩(wěn)定高效運行，提高其設計、運行效率及自愈能力，拓寬工況范圍越來越受到廣泛的關注。 本文針對以上難點和熱點應用數值分析方法開發(fā)高效精確的分析預測模型，首先對離心壓縮機進行非定常數值模擬深入研究了入口導葉與葉輪的非定常相干現(xiàn)象。分析了這種現(xiàn)象對葉輪結構強度的影響，得出這種現(xiàn)象產生氣流激振力為造成葉輪葉片斷裂故障的主要原因。 其次，，探討了葉輪蓋側曲率及軸向長度對壓縮機整級性能影響。對四種不同蓋側曲率葉輪進行氣動性能、力學性能以及振動模態(tài)綜合分析。分析結果表明，減少葉輪輪蓋側曲率會使空氣動力學性能明顯提高同時也會使葉輪機械性能有所改善，振動固有頻率有所提高，但在得益的同時必須要考慮這種葉輪引起相關轉子動力學問題。 最后，采用CFD技術研究離心壓縮機整級性能優(yōu)化設計方法。應用全三維流場分析的方法分析葉輪、擴壓器以及回流器葉片參數變化對壓縮機性能的影響。在此基礎上，對主要幾何參數進行了優(yōu)化設計并建立氣動參數與結構參數之間的對應關系。研究結果表明，通過在壓縮機運行過程中調節(jié)擴壓器葉片的角度，可以使壓縮機的最大效率和工況范圍均得到改善。對于本模型的壓縮機，效率可提高2％以上。優(yōu)化設計后壓縮機整級氣動性能得到明顯改善。本文的研究成果可為提高壓縮機的設計效率和工況范圍及自愈調控提供有效的方法。
[Abstract]:Centrifugal compressor as the core equipment is widely used in oil and gas, large-scale coal chemical industry, deep-sea oil and gas mining and other fields. The performance of centrifugal compressor directly affects the economic benefit, safe operation and reliability of the whole unit. At present, with the rapid development of economy, resources consumption, environmental deterioration and other problems are becoming more and more serious. Therefore, how to keep compressor safe, stable and efficient operation, improve its design, operation efficiency and self-healing ability, broaden the scope of working conditions has been more and more widely concerned. In this paper, an efficient and accurate analysis and prediction model is developed by using the numerical analysis method in view of the above difficulties and hot spots. First, the unsteady coherent phenomenon between the inlet guide vane and the impeller is deeply studied by unsteady numerical simulation of the centrifugal compressor. The influence of this phenomenon on the strength of impeller structure is analyzed. It is concluded that the main reason for the failure of impeller blade is the airflow exciting force caused by this phenomenon. Secondly, the influence of the side curvature and axial length of the impeller cover on the overall performance of the compressor is discussed. The aerodynamic, mechanical and vibration modes of four kinds of impellers with different cover and side curvature were analyzed. The results show that reducing the lateral curvature of the impeller cover can obviously improve the aerodynamic performance and improve the mechanical properties of the impeller and the natural frequency of vibration. But at the same time, the rotor dynamics caused by the impeller must be considered. Finally, CFD technology is used to study the optimization design method of centrifugal compressor integral performance. The effect of blade parameters of impeller diffuser and reflux on compressor performance was analyzed by using the method of full-3D flow field analysis. On this basis, the main geometric parameters are optimized and the corresponding relationship between aerodynamic parameters and structural parameters is established. The results show that the maximum efficiency and working range of the compressor can be improved by adjusting the angle of the diffuser blade during the operation of the compressor. For the compressor of this model, the efficiency can be increased by more than 2%. After the optimization design, the overall aerodynamic performance of the compressor is obviously improved. The research results of this paper can provide an effective method for improving the design efficiency, working condition range and self-healing regulation of compressor.
【學位授予單位】：北京化工大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TH452

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本文編號：2179872