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时间:2020-03-21
《用热流探针测量激波速度.pdf》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、第28卷第5期实验流体力学Vo1.28。No.52014年1O月JournalofExperimentsinFluidMechanics0ct.。2O14文章编号:1672—9897(2014)05—0086-06doi:10.11729/syltlx2O13OO98用热流探针测量激波速度张仕忠,李贤,李进平,陈宏,俞鸿儒(中国科学院力学研究所高温气体动力学国家重点实验室,北京100190)摘要:激波速度测量是激波管和激波风洞运行状态的一个重要参数,压电传感器或光学方法测速系统成本高,而传统电离探针在激波马赫数较低、波后温度达不到空气电离程度的情况下
2、无法满足实验要求。提出了一种使用同轴热电偶作为测速探针来测激波速度的方法,弥补了电离探针在激波马赫数较低时的不足。介绍了同轴热电偶探针测速原理,并设计了测量激波速度的系统电路。通过信号放大电路锁定激波冲激信号,触发脉冲信号发生电路,实现了一种单通道、多测点的激波风洞测速系统。分别开展以温度与热流为触发信号的风洞实验,结果表明只有使用热流信号才能满足激波测速的时间要求。关键词:热流探针;激波速度;同轴热电偶;电离探针;激波风洞中图分类号:V211.71文献标识码:AThemeasurementofshockwavevelocitybyheatfluxp
3、robeZhangShizhong,LiXian,LiJinping,ChenHong,YuHongru(StateKeyLaboratoryofHighTemperatureGasDynamics,InstituteofMechanics,ChineseAeademyofSciences,Beijing100190,China)Abstract:Shockwavevelocityisoneofthemostimportantparametersinshocktubeforde—terminingtherunningstates.Itcanbemea
4、suredthroughshockpressureoropticalmethod,ofwhichthecostwillbehighinlargesystems.Ionization—probeisaneffectivemeansofdeterminingthevelocityofdetonationorstrongshockwavesbyusingtheconductivitybehindtheshockwave,butitmaynotmeettheexperimentalrequirementsundertheconditionthatthesho
5、ckwaveveloc—ityissolowthattheairbehindtheshockwavecannotreachtheionizationtemperature.Ather—mocouplefluxprobewithhighfrequencyresponseisusedinourmeasurementsystemtoover—cometheaforementioneddisadvantages.Basedontraditionalionization—probecircuit,thether—mocoupleprobemeasurement
6、circuitisredesigned.Theshockwavesignalisamplifiedandlockedtotriggerthepulsegeneratingcircuittoobtaintheshockvelocitysigna1.Thekeyofthecircuitdesignisthatthesecondaryampsignalinterferenceisparticularlylargeafterthethermalsimula—tionnetwork,duetotheloadthroughacapacitor,therefore
7、,themagnificationofthesecondaryamplificationcircuitcannotbetoohigh,buttheamplitudeofheatfluxsignalisdeterminedbythemagnification,sotherelationshipbetweenthetwofactorsneedtobebalanced.Temperatureandheatfluxsignalsareusedastriggersignalsrespectively.Thedelaytimescontrastedwithpie
8、zoe—lectricsensorsareinconsistentwhenthetriggersignali
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