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时间:2020-03-25
《槽道非定常流场脉动特性的POD分析.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第38卷第3期仪器仪表学报Vol38No32017年3月ChineseJournalofScientificInstrumentMar.2017槽道非定常流场脉动特性的POD分析刘阁,陈彬(重庆工商大学废油资源化技术与装备工程研究中心重庆400067)摘要:针对槽道内非定常流场的脉动程度是影响传质、传热的效率问题,通过构建2DPIV测量非定常流场瞬态速度矢量场的实验系统,分析了2DPIV测量的各个时刻矢量场和涡量分布的形态,获取了非定常流场的循环周期和频率;利用本征正交分解(POD)技术分解了2DPIV的测量非定常流场的瞬态速度矢量场,根据各个模态的能量比,
2、选取前16阶模态作为非定常流场的主导结构模态,并对POD分解的前16阶模态系数进行功率谱分析;结果表明POD分解的低阶模态分别表征了非定常流场的基频和相应的倍频,阐明了非定常流场的脉动机理;非定常流场的脉动是由于一些涡列和余弦形式的波状主流形成的,并将这些涡列以及伴随的波状主流的脉动频率映射到POD分解的低阶主导模态系数上。关键词:槽道流;非定常流场;脉动特性;2D粒子图像测速;本征正交分解+中图分类号:TH741O357.43文献标识码:A国家标准学科分类代码:460.40Fluctuationcharacteristicanalysisofunsteadyfl
3、owfieldbasedonproperorthogonaldecompositionLiuGe,ChenBin(EngineeringResearchCentreforWasteOilRecoveryTechnologyandEquipment,ChongqingTechnologyandBusinessUniversity,Chongqing400067,China)Abstract:Thefluctuationsintheunsteadyflowchannelfieldcaneasilyaffecttheefficiencyofmasstransferand
4、heattransfer.Anexperimentalsystemisconstructedtocarryout2DPIVmeasurementofthetransientvelocityvectorfieldflowofunsteadyfield.Withtheexperimentalsystem,andtheformsofvectorfieldandvorticitydistributionateachtimeareanalyzed,andthecycleandfrequencyoftheunsteadyflowareobtained.Thetransient
5、velocityvectorfieldofunsteadyflowfieldisdecomposedusingProperOrthogonalDecomposition(POD)technology.Accordingtotheenergyratioofvariousmodes,thefirst16modesasdominantmodesareselectedtorepresentdominantstructureofunsteadyflowfield,andthefirst16modescoefficientofthePODdecompositionareana
6、lyzedusingpowerspectrum.ThedecompositionresultsshowthatthelowordermodeswithPODarethefundamentalfrequencyandcorrespondingfrequencymultiplicationoftheunsteadyflowfield,andthefluctuationmechanismofunsteadyflowfieldisrevealed.Thefluctuationoftheunsteadyflowfieldiscausedbysomevortexesandco
7、sineswaveformedmainstream,thefluctuationfrequencyofthevortexesandwavemappingofthemainstreammapsthedominantlowordercoefficientsofPOD.Keywords:channelflow;unsteadyflowfield;fluctuationcharacteristic;2Dparticleimagevelocimetry(2DPIV);properorthogonaldecomposition(POD)效率,但当脉动达到一定程度后就会产生破坏
8、作用。因1
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