【摘要】：壓縮空氣儲能技術能夠解決可再生能源發(fā)電大規(guī)模并網問題,同時可以對電網進行“削峰填谷”、減少電網總的裝機容量、節(jié)約能源,具有巨大的發(fā)展?jié)摿�。因此研究壓縮空氣儲能技術對于解決當前社會面臨的能源、環(huán)境問題具有重要的意義。 膨脹機是壓縮空氣儲能系統(tǒng)的核心部件之一,MW級壓縮空氣儲能系統(tǒng)膨脹機采用向心渦輪結構形式。向心渦輪主要包括進氣結構、葉輪及排氣結構,其中進氣結構性能對整個向心渦輪性能具有顯著影響。本文主要針對集氣室和蝸殼兩種進氣結構形式開展研究,在分析集氣室內部流動的基礎上,設計多種向心渦輪進氣蝸殼,并數值對比分析不同進氣結構對向心渦輪性能的影響。主要研究內容如下： 1.采用二維設計方法為某向心渦輪設計矩形截面蝸殼,分別對進氣結構為蝸殼和集氣室的向心渦輪進行整級全周數值計算,對比研究進氣結構對向心渦輪性能的影響。結果表明：集氣室內部流動有較大的損失,同時增強了導葉流道內二次流；與集氣室相比,蝸殼進氣結構使向心渦輪整級的效率、質量流量和功率都有一定程度的提高。 2.針對所研究向心渦輪設計不同截面尺寸的蝸殼,研究蝸殼無量綱氣動尺寸S1和蝸殼截面寬度B對向心渦輪整級性能的影響,獲得了相匹配的最優(yōu)無量綱氣動尺寸S1,發(fā)現蝸殼截面寬度B的變化對向心渦輪的性能影響很小。 3.開展蝸殼非對稱性對渦輪性能影響研究,分析蝸殼內部流動結構和二次流分布,研究發(fā)現對稱蝸殼和非對稱蝸殼在蝸殼出口導葉前緣均形成漩渦結構,對稱蝸殼為軸向對稱的兩個漩渦,而非對稱蝸殼靠近機匣側的漩渦較強,靠近輪轂側的較弱,非對稱蝸殼使向心渦輪的性能略有降低。
[Abstract]:Compressed air energy storage technology can solve the problem of large-scale grid connection of renewable energy generation, at the same time, it can "cut the peak and fill the valley", reduce the total installed capacity of power grid, save energy, and have great development potential. Therefore, the study of compressed air energy storage technology is of great significance to solve the energy and environmental problems that the society is facing. Expander is one of the core components of compressed air energy storage system. The expansion machine of MW class compressed air energy storage system adopts the form of concentric turbine. The centripetal turbine mainly includes the intake structure, impeller and exhaust structure, in which the performance of the intake structure has a significant effect on the performance of the whole centripetal turbine. Based on the analysis of the inner flow of the gas collecting chamber, this paper mainly studies the two kinds of intake air structure forms of the collecting chamber and volute. On the basis of analyzing the internal flow of the gas collecting chamber, several kinds of inlet volute cases of the concentric turbine are designed, and the effects of different intake structures on the performance of the concentric turbine are compared and analyzed numerically. The main contents are as follows: 1. A two-dimensional design method is used to design a rectangular section volute for a centripetal turbine. The full-cycle numerical calculation of a concentric turbine with a volute and a collecting chamber is carried out, respectively. The effects of the intake structure on the performance of a concentric turbine are compared and studied. The results show that the flow loss in the gas collecting chamber is great, and the secondary flow in the guide vane passage is enhanced, and the volute intake structure makes the integrated efficiency of the centripetal turbine compared with the gas collecting chamber. Mass flow and power have a certain degree of improvement. 2. The effects of dimensionless aerodynamic dimensions S1 and cross-section width B of the volute on the integral performance of the centripetal turbine are studied. The optimal dimensionless aerodynamic size S _ 1 is obtained. It is found that the change of volute section width B has little effect on the performance of the concentric turbine. The effect of volute asymmetry on turbine performance is studied. The flow structure and secondary flow distribution in the volute are analyzed. It is found that both symmetric volute and asymmetric volute form a swirl structure at the front edge of the guide vane at the outlet of the volute. The symmetrical volute is two axially symmetric swirls, while the asymmetric volute is stronger near the casing side and weaker near the hub side. The asymmetric volute makes the performance of the centripetal turbine slightly lower.
【學位授予單位】：中國科學院研究生院（工程熱物理研究所）
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TK02;TB653

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