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得到固定開口下滑閥滑腔內(nèi)流體的速度湍能分布等結(jié)果,利用實(shí)驗(yàn)研究和理論推導(dǎo),對(duì)閥內(nèi)流場分布和能量損失進(jìn)行研究。液壓閥CFD模型及解析假定.CFD分析模型滑閥結(jié)構(gòu)為對(duì)稱結(jié)構(gòu),用UG建立了閥內(nèi)流體的三維模型。圖所示為常規(guī)滑閥模型,圖為改進(jìn)滑閥模型。對(duì)比可以看出,改進(jìn)滑閥模型是將閥芯凹角處直角改為圓弧形過渡。受實(shí)驗(yàn)條件限制,為了進(jìn)一步研究與實(shí)驗(yàn)對(duì)比,本文采用通經(jīng)的O型機(jī)能的換向閥為研究對(duì)象。液壓閥.解析假設(shè)本文僅進(jìn)行靜態(tài)分析,在數(shù)值計(jì)算過程中,采用以下參數(shù)及假設(shè)對(duì)模型進(jìn)行數(shù)值模擬假設(shè)滑閥為理想液壓滑閥,即閥芯與閥體配合 ;選取液壓油YA-N為流動(dòng)介質(zhì),其密度為0kg/m,粘度為mm/s;假設(shè)液體為理想牛頓液體;模型中雷諾數(shù)Re為,遠(yuǎn)大于滑閥閥口處的臨界雷諾數(shù)0,因此液體在滑閥內(nèi)的流動(dòng)狀態(tài)主要為湍流,又因液體在閥內(nèi)滑腔為圓柱曲面,故在fluent中采用標(biāo)準(zhǔn)k-。
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