【摘要】：我國北方河流普遍含沙量較大,南方河流含沙量相對較低,但過沙量較大。運行在這些河流上的水輪機因過流部件極易受到泥沙磨損與空蝕的聯(lián)合作用,產(chǎn)生非常嚴重的磨蝕,從而大幅度降低了水輪機的水力性能,且在很大程度上威脅著水輪機運行的安全穩(wěn)定性。為研究含沙工況下水輪機的磨蝕性能,本文首先對軸流轉(zhuǎn)槳式水輪機磨蝕機理進行分析探討,結(jié)合電站增容改造中對轉(zhuǎn)輪室處理的實際案例,分析了含沙水流對軸流轉(zhuǎn)槳式水輪機轉(zhuǎn)輪的磨蝕影響。采用超音速火焰噴涂方法,制備納米WC-10Co-4Cr涂層,并在料槳磨粒磨蝕機上試驗其抗磨蝕性能。本文主要研究內(nèi)容如下:(1)對軸流轉(zhuǎn)槳式水輪機磨蝕機理的分析及探討,從合理運行、減少過機含沙量、優(yōu)化軸流轉(zhuǎn)槳式水輪機抗磨蝕涂層處理技術(shù)等方法進行綜合分析。(2)通過試驗的手段,對比分析納米WC-10Co-4Cr涂層與Cr_3C_2-Ni Cr涂層的抗磨蝕效果,并研究不同含量、不同粒徑泥沙對磨蝕影響。試驗研究表明,納米WC-10Co-4Cr涂層抗磨蝕效果比Cr_3C_2-NiCr涂層好。試件磨蝕失重量與時間的關(guān)系可以分為三個過程:潛伏期、加速期和穩(wěn)定期。從本試驗來看,水中泥沙粒徑越大,對磨蝕影響就越大;泥沙濃度越大,磨蝕現(xiàn)象就會越嚴重。
[Abstract]:Generally speaking, the sediment content of the northern rivers in China is higher than that of the southern rivers, but the amount of sediment passing through the rivers is relatively lower than that of the rivers in the south. The turbine running on these rivers is easy to be affected by the combined action of sediment wear and cavitation erosion because of the excessive flow parts, which results in very serious erosion, which greatly reduces the hydraulic performance of the turbine. To a large extent, it threatens the safety and stability of turbine operation. In order to study the erosion performance of hydraulic turbines under the condition of sand, this paper first analyzes and discusses the erosion mechanism of axial flow propeller turbines, and combines with the actual cases of the treatment of runner chambers in the retrofitting of power stations. The effect of sand-bearing flow on the erosion of axial flow propeller turbine runner is analyzed. Nano-sized WC-10Co-4Cr coatings were prepared by supersonic flame spraying, and their wear resistance was tested on the abrasive grinding machine. The main contents of this paper are as follows: (1) the analysis and discussion of the erosion mechanism of the shaft flow propeller turbine, in order to reduce the sediment content in the turbine, The anti-wear coating technology of axial flow turbine was optimized. (2) by means of experiment, the wear resistance of nano-sized WC-10Co-4Cr coating and Cr_3C_2-Ni Cr coating were compared and analyzed, and the different contents of the coating were studied. The effect of different particle size sediment on erosion. The results show that the wear resistance of nano WC-10Co-4Cr coating is better than that of Cr_3C_2-NiCr coating. The relationship between abrasion weight loss and time can be divided into three processes: incubation period, acceleration period and stable period. According to this experiment, the larger the sediment particle size in the water, the greater the effect on erosion, and the more the sediment concentration, the more serious the erosion phenomenon will be.
【學位授予單位】：南昌工程學院
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TK733.5

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本文編號：2197778