【摘要】：液滴沖蝕指的是材料受到小而松散的液滴顆粒沖擊時(shí)表面出現(xiàn)破壞的一類損耗現(xiàn)象,同時(shí)也是氣動(dòng)疏水閥等設(shè)備的表面損傷主要形式之一。蒸汽管路中的凝結(jié)水,在高速流動(dòng)的蒸汽推動(dòng)下,會(huì)對(duì)閥門或使用蒸汽的設(shè)備產(chǎn)生強(qiáng)烈的撞擊,從而造成閥門等設(shè)備的沖蝕損傷或破壞,減小設(shè)備的使用壽命。基于此,本文研究氣動(dòng)疏水閥內(nèi)氣液兩相流的沖蝕特性,提出減弱沖蝕損傷的辦法具有重要的工程價(jià)值和理論價(jià)值。本文以SY4500氣動(dòng)疏水閥為研究對(duì)象,采用ICEM軟件對(duì)其流道模型進(jìn)行整體結(jié)構(gòu)網(wǎng)格劃分,使用CFX軟件中的Eulerian-Lagrangian多相流粒子追蹤模型和SST k-w湍流模型進(jìn)行流場(chǎng)模擬。在對(duì)網(wǎng)格進(jìn)行無(wú)關(guān)性驗(yàn)證基礎(chǔ)上,研究液滴在閥門內(nèi)的液滴運(yùn)行軌跡,分析閥門表面容易損傷的部位。調(diào)用兩相流流場(chǎng)仿真的分析結(jié)果,采用了顯式動(dòng)力學(xué)軟件LS-DYNA分析液滴撞擊靶板的應(yīng)力應(yīng)變,比較不同工況下閥內(nèi)各個(gè)部位的抗沖蝕特性。最后,根據(jù)上述兩相流流場(chǎng)模擬結(jié)果和動(dòng)力學(xué)仿真結(jié)果,得到了降低液滴的法向速度可以有效的減少該氣動(dòng)疏水閥的沖蝕磨損的結(jié)論,并優(yōu)化設(shè)計(jì)了一種新型的多級(jí)對(duì)沖式結(jié)構(gòu),提高疏水閥的抗沖蝕特性。
[Abstract]:Droplet erosion refers to a kind of loss phenomenon when the material is impacted by small and loose droplet particles. It is also one of the main forms of surface damage of pneumatic trap and other equipment. The condensate water in steam pipe will strongly impact the valve or the equipment using steam under the push of high speed steam flow, which will cause erosion damage or damage to the equipment such as valve, and reduce the service life of the equipment. Based on this, the erosion characteristics of gas-liquid two-phase flow in pneumatic trap are studied in this paper, and the method of reducing erosion damage has important engineering value and theoretical value. In this paper, the SY4500 pneumatic trap is used as the research object, and the flow field is simulated by using the Eulerian-Lagrangian multi-phase flow particle tracing model and the SST k-w turbulence model in the CFX software. On the basis of the grid independence verification, the droplet trajectory in the valve was studied, and the easily damaged parts on the valve surface were analyzed. Based on the simulation results of two-phase flow field, an explicit dynamic software LS-DYNA is used to analyze the stress and strain of droplets impacting on the target plate, and the anti-erosion characteristics of various parts of the valve under different working conditions are compared. Finally, according to the simulation results of the two-phase flow field and the dynamic simulation results, it is concluded that reducing the normal velocity of the droplet can effectively reduce the erosion wear of the pneumatic trap valve. A new multi-level hedge structure is designed to improve the erosion resistance of the trap.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TH138.52

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