low-and high-speed flight experiments on transition detection

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1、low-andhigh-speedflightexperimentsontransitiondetectionThispaperdescribesinflightmeasurementsinlowandhighspeedexperimentstoinvestigatelaminar-turbulenttransitiononairfoils.Thelow-speedexperimentswerecarriedoutusingalaminarwinggloveforasailplane.High–speedexperimentsonanmodifiedA320hybridlaminarfinwe

2、reconductedinclosecollaborationwithAirbus.Differentsurfacesensormeasuringtechniques(piezofoil,surfacehotwires,wallmicrophones)wereusedinthelow-speedexperiments.Thepiezofoiltechniquewasappliedinthehigh-speedin-flightexperimentstoprovetheoperation（手术,行动，活动,操作）robustness（强度(坚固性）,thefunctionalcapability

3、,durability,andreliabilityunderatmosphericconditions（大气状态）incruiseflightonmodernairplanes.allmeasuringtechniquesweresuccessfullyimplementedfortheparticulartaskandthelaminar-turbulenttransitionwasdetectedwithahighdegreeofcertainty.investigationsacompletepiezofoilsensorarraywasglueddirectlytothefinwit

4、houtcausinganyinterferencebetweentheboundarylayerflowandthesensorfoil.Thistechniquethereforeofferedthegoodpotentialtodetecttransitionintheboundarylayerunderflightconditionsespeciallyinhigh-speedtests.摘要该报告介绍了如何在高、低速飞行试验条件下，测量翼剖面层流-紊流的转变。低速试验用层流翼套套在一架滑翔机上完成，高速试验（在一架与空客合作的）改装的A320混合层流垂尾上完成。低速试验应用(piez

5、ofoil、表面热导线、墙壁麦克风)三种表面传感器测量技术。采用一种压箔技术验证了现代飞机在高速飞行中的操作强度、机动能力、耐久性和可靠性。该项任务中，成功地采用了全部测量技术，测出的层流-紊流变化高度可靠。Forthehigh-speed高速试验中，将一个完整的压箔传感器阵列直接粘在垂尾上，克服了附面层流和传感器箔之间的任何干涉。这种技术适用于飞行条件特别是高速飞行试验条件下，检测边界层层流的变化。IintroductionTheinvestigationspresentedinthispaperareaimedatfindingthelaminar–turbulenttransitioni

6、ntheboundarylayeronanairfoil,particularlythespatialdevelopmentandgrowthofflowinstabilitiessuchasTollmien-Schlichting(TS)wavesthatleadtotransition1介绍本文调查的目的是为了寻找在翼剖面界面层层流-紊流的转变，主要是研究在空间发展和不稳定流的成长如Tollmien-Schlichting型扰动ItiswellknownthatthegenerationofTSwavesstronglydependsontheenvironmentalflowcondit

7、ions.众所周知,产生一次TS波极其需要依赖环境流量条件。Itisthereforenecessarytoinvestigatethetransitionunderrealflightconditionsaswellasinwind-tunneltests.因此很有必要,探讨实际飞行条件和风洞测试的转换。BasedontheexperiencegainedintheDeutscheForschu