ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities最新文献

Recent applications of particle image velocimetry in large-scale industrial wind tunnels 粒子图像测速技术在大型工业风洞中的最新应用

ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities Pub Date : 1997-09-29 DOI: 10.1109/ICIASF.1997.644688

C. Willert, M. Raffel, J. Kompenhans

{"title":"Recent applications of particle image velocimetry in large-scale industrial wind tunnels","authors":"C. Willert, M. Raffel, J. Kompenhans","doi":"10.1109/ICIASF.1997.644688","DOIUrl":"https://doi.org/10.1109/ICIASF.1997.644688","url":null,"abstract":"A variety of particle image velocimetry (PIV) systems for use in industrial wind tunnels have been developed at DLR in the past decade. Given the high operational costs of modern wind tunnels and the required instrumentation, the PIV system design emphasis concentrates on portability, modularity and reliability. Typical applications require large observation distances (>5 m) and relatively large observation areas (>600/spl times/400 mm/sup 2/). The recent introduction of digital imaging allows a rapid availability of the PIV data and feed-back during tunnel operation. The flexibility of these portable systems is illustrated by presenting several results of recent PIV applications: (1) blade/vortex interactions on a model helicopter rotor, (2) the flow downstream of an aircraft model in landing configuration in the 6/spl times/8 m/sup 2/ test section of the DNW Large Low Speed Testing facility (German-Dutch Wind Tunnel) and (3) the flow in the slat region of a two-dimensional high-lift air-foil. In each case the advantage of PIV in providing instantaneous velocity maps is apparent when compared to the time-averaged result. Current development efforts of extending the PIV method to provide three-dimensional data in wind tunnel environments are also given.","PeriodicalId":122871,"journal":{"name":"ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123151478","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Background and prediction of correct full-scale reproduction in wind tunnels as concerns gas dynamic parameters of hypervelocity atmospheric flights and scramjet combustion chamber conditions 超高速大气飞行和超燃冲压发动机燃烧室条件下气体动力学参数在风洞中正确全尺寸重现的背景和预测

ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities Pub Date : 1997-09-29 DOI: 10.1109/ICIASF.1997.644764

V.I. Alfyorov, L.M. Dmitriyev, B.V. Yegorov, Yu.Ye. Markachev, A. Rudakova

{"title":"Background and prediction of correct full-scale reproduction in wind tunnels as concerns gas dynamic parameters of hypervelocity atmospheric flights and scramjet combustion chamber conditions","authors":"V.I. Alfyorov, L.M. Dmitriyev, B.V. Yegorov, Yu.Ye. Markachev, A. Rudakova","doi":"10.1109/ICIASF.1997.644764","DOIUrl":"https://doi.org/10.1109/ICIASF.1997.644764","url":null,"abstract":"The report analyzes possible schemes of aerodynamic rigs intended for reproducing gas dynamic parameters (velocity, density, pressure, and temperature) and chemical air composition as applied to the TAV trajectory with the indication of required stagnation parameters (P/sub 0/, T/sub 0/). Based on the calculation of physico-chemical processes taking place in nozzles of classical facilities it is inferred that the chemical air composition differs noticeably from the natural air composition even in solving the problem of producing and retaining the gas in the plenum chamber at ultrahigh temperatures and pressures (T/sub 0//spl ges/7000 K, P/sub 0//spl ges/4/spl middot/10/sup 8/ Pa). The analysis carried out reveals a distinct advantage of MHD-gas acceleration facilities in solving the stated problem. A set of equations of magnetogasdynamics and multitemperature physico-chemical kinetics which underlie the computation program is presented. The channels of energy transport from the electromagnetic field to the gas at different gas densities are considered. The program was compiled using the experimental data obtained in the TsAGI MHD-gas acceleration hypersonic wind tunnel. The report presents the calculated data on gas acceleration regimes in a wide spectrum of initial conditions and electrodynamic parameters. The consideration of nonequilibrium physico-chemical processes in the MHD-channel and in the secondary nozzle makes it possible to state that the nonequilibrium effects facilitate considerably the reproduction of a natural chemical air composition and a static temperature in the facility test section. The influence of alkali seeds on the induction time and hydrogen burning process in the scramjet combustion chamber is evaluated. Possible technical approaches to the realization of calculated versions of MHD-accelerators are analyzed.","PeriodicalId":122871,"journal":{"name":"ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115512440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Particle image velocimetry using Bragg cell as optical shutter 用Bragg细胞作光学快门的粒子图像测速

ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities Pub Date : 1997-09-29 DOI: 10.1109/ICIASF.1997.644692

A. Ramuzat, M. Riethmuller, L. Angelucci

引用次数: 2

Global luminescent lifetime measurements on a body in free fall 自由落体的整体发光寿命测量

ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities Pub Date : 1997-09-29 DOI: 10.1109/ICIASF.1997.644653

G. Dale, A. Baron, C. Tyler, V. Mastrocola

{"title":"Global luminescent lifetime measurements on a body in free fall","authors":"G. Dale, A. Baron, C. Tyler, V. Mastrocola","doi":"10.1109/ICIASF.1997.644653","DOIUrl":"https://doi.org/10.1109/ICIASF.1997.644653","url":null,"abstract":"An experiment to investigate the feasibility of making global luminescent lifetime measurements in the laboratory is described. The measurements, on store models in free fall in still air, was motivated by the availability of a fast framing CCD (FF-CCD) camera under development. The store models were coated with a pressure sensitive paint (PSP) incorporating platinum meso-tetra (Pentafluorphenyl) Porphyrin (PtTFPP) dye having a luminescent lifetime of approximately 20 /spl mu/sec at atmospheric pressure. Changes in paint lifetime were induced by injecting inert gas in the vicinity of the falling store. The test region was illuminated with a standard, frequency-doubled Nd:YAG laser. The luminescence of the paint was acquired using the FF-CCD camera which employs a unique focal plane array having the facility to store images on the array itself. The camera system can acquire images at rates up to 1 MHz. The luminescent lifetimes were measured using rapid lifetime determination, a time domain technique which involves monitoring the luminescence of the paint following pulsed excitation. Lifetime measurements are presented for the store model in free fall. Measurement error sources are discussed. Characteristics of an improved measurement system are proposed.","PeriodicalId":122871,"journal":{"name":"ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129429048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Fiber optic pressure/skin friction gage for supersonic flow applications 用于超音速流量应用的光纤压力/表面摩擦计

ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities Pub Date : 1997-09-29 DOI: 10.1109/ICIASF.1997.644753

W. Pulliam, M. Jones, J. Schetz, K. Murphy

引用次数: 2

The investigation of the power characteristics of two-dimensional asymmetric nozzles 二维非对称喷管的功率特性研究

ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities Pub Date : 1997-09-29 DOI: 10.1109/ICIASF.1997.644678

V. Zudov, A. Lokotko

引用次数: 0

Blade deformation and PSP measurements on the large scale rotor by videometric system 用视频测量系统测量大型转子叶片变形和PSP

ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities Pub Date : 1997-09-29 DOI: 10.1109/ICIASF.1997.644670

S. Bosnyakov, A. Bykov, V. Coulech, S. Fonov, A. Morozov, V. Moskalik

引用次数: 9

Fabry-Perot photonic temperature sensor system 法布里-珀罗光子温度传感器系统

ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities Pub Date : 1997-09-29 DOI: 10.1109/ICIASF.1997.644755

M. Tuma, K. A. Elam, T. Sawatari, P. Gaubis, Yuping Lin

引用次数: 2

Wall adaptation and determination of residual wall interferences for a 2D and a 3D model in the transonic wind tunnel TWG of DLR DLR跨声速风洞TWG二维和三维模型的壁面自适应及残余壁面干扰的确定

ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities Pub Date : 1997-09-29 DOI: 10.1109/ICIASF.1997.644679

H. Holst, K.-W. Bock

{"title":"Wall adaptation and determination of residual wall interferences for a 2D and a 3D model in the transonic wind tunnel TWG of DLR","authors":"H. Holst, K.-W. Bock","doi":"10.1109/ICIASF.1997.644679","DOIUrl":"https://doi.org/10.1109/ICIASF.1997.644679","url":null,"abstract":"The transonic wind tunnel TWG of DLR Gottingen has been modernized with respect to an improved flow quality as well as to the logistics of exchangeable test sections, operational reliability and productivity. It is presently equipped with a Laval nozzle (supersonic), a perforated test section (transonic) and a two-dimensional adaptive (subsonic) test section. The latter can perform 2D adaptive tests on wing profiles using the Cauchy integral formula for wall adaptation, as well as 2D wall adaptation for 3D models utilizing the Wedemeyer/Lamarche (VKI) procedure. For both cases the wall adaptation was successful. The 3D force results compare quite well nominally interference-free results and to results from another adaptive test section. The pressure distribution from the wing profile tests agree quite well with theoretical results. For the 3D model, residual wall interferences were determined. It was found that the wall interferences had been reduced to nearly zero on the centreline of the test section by wall adaptation. Spanwise averages of the residual wall interferences have been used for further corrections.","PeriodicalId":122871,"journal":{"name":"ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133444766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Whole-field visualisation and velocity measurement of an instantaneous transonic turbine flow 瞬时跨音速涡轮流动的全场可视化和速度测量

ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities Pub Date : 1997-09-29 DOI: 10.1109/ICIASF.1997.644690

P. Bryanston-Cross, D. Udrea, G. Guenette, A. Epstein, E. M. D'Hoop

引用次数: 6