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1、第44卷第2期航空計(jì)算技術(shù)Vol.44No.22014年3月AeronauticalComputingTechniqueMar.2014大葉尖間隙下葉柵性能數(shù)值模擬楊振磊,黃秀全(西北工業(yè)大學(xué)動(dòng)力與能源學(xué)院,陜西西安710072)摘要:利用NUMECA軟件對(duì)某線性葉柵的三維流場(chǎng)進(jìn)行了數(shù)值模擬,對(duì)比研究了小葉尖間隙和大葉尖間隙時(shí)葉尖泄漏渦流的形成和發(fā)展,探討了葉尖間隙大小對(duì)葉柵流場(chǎng)和氣動(dòng)性能的影響。研究表明,隨著葉尖間隙的增大,葉尖泄漏射流發(fā)展成為葉尖泄漏渦,渦流范圍不斷增大,渦流強(qiáng)度增大趨緩,渦流使得氣流偏轉(zhuǎn)減小。從小間隙逐漸增大到大間隙,總壓損失與葉
2、片載荷均增大,而在大葉尖間隙時(shí),總壓損失增加并不顯著,葉片載荷增大趨緩。其結(jié)論為進(jìn)一步揭示葉尖間隙渦流的流動(dòng)機(jī)理以及工業(yè)燃?xì)廨啓C(jī)的優(yōu)化設(shè)計(jì)提供了參考。關(guān)鍵詞:線性級(jí)聯(lián)葉柵;葉尖間隙;泄漏渦流;數(shù)值模擬中圖分類號(hào):V211 文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1671桘654X(2014)01桘0070桘05NumericalSimulationonLinerCascadewithLargeTipClearanceYANGZhen桘lei,HUANGXiu桘quan(SchoolofPowerandEnergy,NorthwesternPolytechnical
3、University,Xi′an710072,China)Abstract:Inthispaper,thethree桘dimensionalflowofalinercascadehasbeennumericalsimulatedbyu-singthecommercialsoftwareNumeca.Toinvestigatetheformationanddevelopmentoftheleakagevortexandtheinfluenceofthetipclearancesizeintheaerodynamiccharacteristicsandfl
4、owfieldofthecas-cade,thecalculationofthecascadeindifferenttipclearance,suchassmalltipclearanceandlargetipclearancehasbeendone.Theresultshowedthatwhilethetipclearanceincreased,thejetgraduallydevel-opedintoavortex,andthescopeofthevortexincreased,buttheintensityofthevortexdidn′tinc
5、reasednotably.Meanwhile,thedeflectionoftheflowcausedbythevortexdecreased.Whenthetipclearancesizeincreasedfromsmallonetolargeone,boththetotalpressurelossandthebladeforceincreasedremark-ably.However,withinthelargetipclearance,thetotalpressurelossdidn′tincreaseclearlyandthein-creas
6、eofthebladeforcetendedtobeslow.Theseresultsmightprovidesignificantinferencetothestudyofleakagevortexandthedesignofindustrialgasturbines.Keywords:linercascade;tipclearance;leakagevortex;numericalsimulation引言隙流動(dòng)開(kāi)展了大量的研究工作,取得了一系列經(jīng)驗(yàn)和葉尖間隙泄漏流動(dòng)是葉輪機(jī)械流動(dòng)中最普遍和最認(rèn)識(shí)。研究人員在不同間隙下進(jìn)行葉柵實(shí)驗(yàn)探究,發(fā)典型的流動(dòng)過(guò)
7、程之一,在影響葉尖間隙泄漏流動(dòng)的諸現(xiàn)葉尖間隙泄漏流動(dòng)引起了葉尖間隙渦流的產(chǎn)生,由[1]多因素中,葉尖間隙大小是主要因素之一。間隙值于葉尖間隙與端壁缺少相對(duì)運(yùn)動(dòng),泄漏渦并沒(méi)有向通[1][3]的變化必然導(dǎo)致間隙泄漏流以及間隙損失的產(chǎn)生,但道中擴(kuò)散,而是沿著吸力面向尾緣發(fā)展。Gbadebo是它們的發(fā)展形式存在一定程度的差異。對(duì)不同葉尖研究了端壁附近葉尖間隙流動(dòng)和三維流動(dòng)之間的影間隙下泄漏流動(dòng)進(jìn)行研究,分析間隙泄漏流動(dòng)的產(chǎn)生響,發(fā)現(xiàn)由于葉尖間隙渦流的產(chǎn)生,葉尖間隙泄漏流動(dòng)[4]和發(fā)展機(jī)理,探究間隙值對(duì)間隙泄漏渦的影響規(guī)律,具嚴(yán)重影響了三維二次流動(dòng)的運(yùn)動(dòng)軌跡。T
8、ang在兩種有重要的工程意義,有助于葉輪機(jī)械設(shè)計(jì)的改進(jìn)、效率不同葉尖間隙情況下,對(duì)一組葉柵進(jìn)行