{"title":"Soft Sled - the Low Vibration Sled Test Capability at the Holloman High Speed Test Track","authors":"M. Hooser","doi":"10.2514/6.2018-3872","DOIUrl":"https://doi.org/10.2514/6.2018-3872","url":null,"abstract":"","PeriodicalId":373890,"journal":{"name":"2018 Aerodynamic Measurement Technology and Ground Testing Conference","volume":"134 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117305362","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}
{"title":"Investigation of Soot Formation Near Flame-Wall Interaction Region in Rich Ethylene/Air Flames","authors":"Ayush Jain, Yejun Wang, W. Kulatilaka","doi":"10.2514/6.2018-3944","DOIUrl":"https://doi.org/10.2514/6.2018-3944","url":null,"abstract":"","PeriodicalId":373890,"journal":{"name":"2018 Aerodynamic Measurement Technology and Ground Testing Conference","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122006323","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}
{"title":"Development of Unsteady Pressure Sensitive Paint Measurement Capability at Arnold Air Force Base","authors":"M. Sellers, Michael Nelson","doi":"10.2514/6.2018-4051","DOIUrl":"https://doi.org/10.2514/6.2018-4051","url":null,"abstract":"","PeriodicalId":373890,"journal":{"name":"2018 Aerodynamic Measurement Technology and Ground Testing Conference","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124601994","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}
C. McDougall, W. Hinman, C. Johansen, B. Bathel, J. Inman, P. Danehy
{"title":"Nitric Oxide Planar Laser-Induced Fluorescence Thermometry Measurements in a Hypersonic Boundary Layer","authors":"C. McDougall, W. Hinman, C. Johansen, B. Bathel, J. Inman, P. Danehy","doi":"10.2514/6.2018-3629","DOIUrl":"https://doi.org/10.2514/6.2018-3629","url":null,"abstract":"","PeriodicalId":373890,"journal":{"name":"2018 Aerodynamic Measurement Technology and Ground Testing Conference","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124770885","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}
C. James, Daniel R. Smith, C. McLean, R. Morgan, S. Lewis, P. Toniato
Traditionally, Pitot rake test models have been used to take time and spatially resolved pressure measurements in impulse facilities for flow characterisation. These measurements allow the test section gas state to be inferred using analytical and more complex computational models. They also provide an indication of experimental test time and core flow diameter. However, being based on only one state variable, they are not definitive, and this gives motivation for developing methods based on other state variables. When expansion tubes are used for the study of hypervelocity planetary entry phenomena, generally the post-shock state in the test section strongly radiates, a phenomenon which is very sensitive to temperature. This paper provides a simple method which uses a high speed camera in addition to a conventional Pitot rake to improve estimates of experimental test time and core flow size by imaging post-shock radiative emission over the probes in the Pitot rake. This method can also be used with specific narrow bandpass optical filters to examine when the emission from key species remain constant in the test flow. The selection of and suitability of various optical filters for an air test gas is examined in this paper. Experimentally, it was found that the radiative emission generally rises quite abruptly at the end of the test time, and sometimes in situations where the pressure remains constant. It was also seen that different optical filters can show their abrupt rise at different times, giving differing values for the end of the test time. For the test condition studied, experiments performed at the entrance and exit of the test facility’s nozzle found that the test time in terms of flow radiative emission was similar in both cases.
{"title":"Improving High Enthalpy Expansion Tube Condition Characterisation Using High Speed Imagery","authors":"C. James, Daniel R. Smith, C. McLean, R. Morgan, S. Lewis, P. Toniato","doi":"10.2514/6.2018-3805","DOIUrl":"https://doi.org/10.2514/6.2018-3805","url":null,"abstract":"Traditionally, Pitot rake test models have been used to take time and spatially resolved pressure measurements in impulse facilities for flow characterisation. These measurements allow the test section gas state to be inferred using analytical and more complex computational models. They also provide an indication of experimental test time and core flow diameter. However, being based on only one state variable, they are not definitive, and this gives motivation for developing methods based on other state variables. When expansion tubes are used for the study of hypervelocity planetary entry phenomena, generally the post-shock state in the test section strongly radiates, a phenomenon which is very sensitive to temperature. This paper provides a simple method which uses a high speed camera in addition to a conventional Pitot rake to improve estimates of experimental test time and core flow size by imaging post-shock radiative emission over the probes in the Pitot rake. This method can also be used with specific narrow bandpass optical filters to examine when the emission from key species remain constant in the test flow. The selection of and suitability of various optical filters for an air test gas is examined in this paper. Experimentally, it was found that the radiative emission generally rises quite abruptly at the end of the test time, and sometimes in situations where the pressure remains constant. It was also seen that different optical filters can show their abrupt rise at different times, giving differing values for the end of the test time. For the test condition studied, experiments performed at the entrance and exit of the test facility’s nozzle found that the test time in terms of flow radiative emission was similar in both cases.","PeriodicalId":373890,"journal":{"name":"2018 Aerodynamic Measurement Technology and Ground Testing Conference","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134088387","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}
{"title":"Statistical Analysis of the Results from Experimentation utilizing Wind Tunnel Angle Measurement Systems","authors":"Heidi S. Glaudel","doi":"10.2514/6.2018-4110","DOIUrl":"https://doi.org/10.2514/6.2018-4110","url":null,"abstract":"","PeriodicalId":373890,"journal":{"name":"2018 Aerodynamic Measurement Technology and Ground Testing Conference","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115285460","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}
Jiawei Zheng, Qingchun Lei, Jiannan He, Yeqing Chi, W. Fan
{"title":"Comparison of Detonation Initiation by Hot Jet and Obstacles Studied via Chemiluminescence Imaging at 200 kHz","authors":"Jiawei Zheng, Qingchun Lei, Jiannan He, Yeqing Chi, W. Fan","doi":"10.2514/6.2018-3947","DOIUrl":"https://doi.org/10.2514/6.2018-3947","url":null,"abstract":"","PeriodicalId":373890,"journal":{"name":"2018 Aerodynamic Measurement Technology and Ground Testing Conference","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124754754","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}
Between 2012 and 2017, parachutes for four NASA Projects were tested in the 80by 120Ft test section of the National Full-Scale Aerodynamic Complex (NFAC) at NASA Ames Research Center. These projects were: (1) Low-Density Supersonic Decelerator (LDSD); (2) Capsule Parachute Assembly System (CPAS, for Orion); (3) Interior Exploration using Seismic Investigations, Geodesy and Heat Transport (InSight, a Mars mission); and (4) Mars 2020. In all tests stereo photogrammetry was used to measure time-dependent positions of features on the canopies. For the LDSD and CPAS tests, where the purpose was to study the trade-off between stability and drag of different parachute designs, the pendulum motion of the canopies about the riser attachment point was measured by calibrated cameras in the diffuser. The CPAS test also included static measurements where the inflated parachutes were pulled to the side by a system of tethers. The Insight tests were structural qualification tests where each canopy was packed in a bag and launched from a mortar. Cameras in the diffuser measured the trajectory of the bag and the stripping of the bag from the canopy. The Mars 2020 test was a workmanship verification test where the canopies were either launched from a mortar or deployed from a sleeve stretched along the tunnel axis. The deployments were recorded from many directions by thirteen high-speed cameras distributed in the diffuser and test section. Photogrammetry was not planned; however, after a tunnel-related accident ended the test prematurely, photogrammetric measurements were bootstrapped from the images to support the accident investigations. This paper describes how the photogrammetry measurements were made in each test and presents typical results.
{"title":"Measurements of Parachute Dynamics in the World’s Largest Wind Tunnel by Stereo Photogrammetry","authors":"E. Schairer, L. K. Kushner, J. Heineck, E. Solis","doi":"10.2514/6.2018-3802","DOIUrl":"https://doi.org/10.2514/6.2018-3802","url":null,"abstract":"Between 2012 and 2017, parachutes for four NASA Projects were tested in the 80by 120Ft test section of the National Full-Scale Aerodynamic Complex (NFAC) at NASA Ames Research Center. These projects were: (1) Low-Density Supersonic Decelerator (LDSD); (2) Capsule Parachute Assembly System (CPAS, for Orion); (3) Interior Exploration using Seismic Investigations, Geodesy and Heat Transport (InSight, a Mars mission); and (4) Mars 2020. In all tests stereo photogrammetry was used to measure time-dependent positions of features on the canopies. For the LDSD and CPAS tests, where the purpose was to study the trade-off between stability and drag of different parachute designs, the pendulum motion of the canopies about the riser attachment point was measured by calibrated cameras in the diffuser. The CPAS test also included static measurements where the inflated parachutes were pulled to the side by a system of tethers. The Insight tests were structural qualification tests where each canopy was packed in a bag and launched from a mortar. Cameras in the diffuser measured the trajectory of the bag and the stripping of the bag from the canopy. The Mars 2020 test was a workmanship verification test where the canopies were either launched from a mortar or deployed from a sleeve stretched along the tunnel axis. The deployments were recorded from many directions by thirteen high-speed cameras distributed in the diffuser and test section. Photogrammetry was not planned; however, after a tunnel-related accident ended the test prematurely, photogrammetric measurements were bootstrapped from the images to support the accident investigations. This paper describes how the photogrammetry measurements were made in each test and presents typical results.","PeriodicalId":373890,"journal":{"name":"2018 Aerodynamic Measurement Technology and Ground Testing Conference","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131468614","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}
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