Visualization of a Capsule Entry Vehicle Reaction-Control System (RCS) Thruster

Danehy, Paul M.; Wilkes, Jennifer A.; Brauckmann, Gregory J.; Alderfer, David W.; Jones, Stephen B.; Patry, D P.

doi:10.2514/6.2006-1532

Cited by 12 publications

(15 citation statements)

References 16 publications

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“…In our previous test entry using PLIF in the same facility, in which we used neither dotcards nor rapid prototyping models, we averaged 3.8 runs per day of testing. 2,3 The use of PLIF decreased the efficiency of testing by nearly a factor of 2 in that test. The use of dotcards and rapid prototyping models with PLIF in the present test has further reduced this efficiency by a factor of 1.5.…”

Section: A Overview Of the Test Campaignmentioning

confidence: 99%

“…In previously reported experiments using this PLIF system, 2,3 an image of a scale was obtained with the PLIF ICCD camera so that the magnification could be determined in post-processing. These past papers recommended imaging a "dotcard" prior to each experiment to improve image spatial fidelity and to determine accurate magnification factors in future experiments.…”

Section: Planar Laser-induced Fluorescence (Plif) Imaging Systemmentioning

confidence: 99%

“…In addition to using these rapid prototyping models, dotcards (flat imaging targets with a regular pattern of square dots) have been implemented in these experiments. The use of dotcards was suggested in previous work 2,3 as a major potential improvement when applying PLIF to study hypersonic flows. The acquisition of dotcard images allowed perspective and lens distortions to be corrected and allowed the PLIF images to be accurately scaled.…”

Section: Introductionmentioning

confidence: 99%

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Fluorescence Visualization of Hypersonic Flow Over Rapid Prototype Wind-Tunnel Models

Alderfer

Danehy

Inma

et al. 2007

45th AIAA Aerospace Sciences Meeting and Exhibit

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Reentry models for use in hypersonic wind tunnel tests were fabricated using a stereolithography apparatus. These models were produced in one day or less, which is a significant time savings compared to the manufacture of ceramic or metal models. The models were tested in the NASA Langley Research Center 31-Inch Mach 10 Air Tunnel. Most of the models did not survive repeated tests in the tunnel, and several failure modes of the models were identified. Planar laser-induced fluorescence (PLIF) of nitric oxide (NO) was used to visualize the flowfields in the wakes of these models. Pure NO was either seeded through tubes plumbed into the model or via a tube attached to the strut holding the model, which provided localized addition of NO into the model's wake through a porous metal cylinder attached to the end of the tube. Models included several 2-inch diameter Inflatable Reentry Vehicle Experiment (IRVE) models and 5-inch diameter Crew Exploration Vehicle (CEV) models. Various configurations were studied including different sting placements relative to the models, different model orientations and attachment angles, and different NO seeding methods. The angle of attack of the models was also varied and the location of the laser sheet was scanned to provide three-dimensional flowfield information. Virtual Diagnostics Interface technology, developed at NASA Langley, was used to visualize the data sets in post processing. The use of calibration "dotcards" was investigated to correct for camera perspective and lens distortions in the PLIF images. Lessons learned and recommendations for future experiments are discussed.

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Section: A Overview Of the Test Campaignmentioning

confidence: 99%

Section: Planar Laser-induced Fluorescence (Plif) Imaging Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fluorescence Visualization of Hypersonic Flow Over Rapid Prototype Wind-Tunnel Models

Alderfer

Danehy

Inma

et al. 2007

45th AIAA Aerospace Sciences Meeting and Exhibit

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“…The image processing method used in the present paper differs from our previous papers. 9,10 This method is detailed in Ref. 14.…”

Section: A Plif Flow Visualization Image Processingmentioning

confidence: 99%

“…Planar laser-induced fluorescence (PLIF) is one of a variety of planar flow visualization techniques that can provide three-dimensionally spatially-resolved off-body visualizations of boundary layers 5,6,7 and other hypersonic flow phenomena. 8,9,10 PLIF visualizations of the flowfields downstream of boundary layer trips could help to explain how and why transition is occurring. Seeding the flow upstream of the trips with a fluorescing gas allows the flowfield over, around, and downstream of trips to be visualized.…”

Section: Introductionmentioning

confidence: 99%

Fluorescence Visualization of Hypersonic Flow Past Triangular and Rectangular Boundary-Layer Trips

Danehy

García

Borg

et al. 2007

45th AIAA Aerospace Sciences Meeting and Exhibit

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Fluorescence imaging and streakline visualization of hypersonic flow over rapid prototype wind-tunnel models

Danehy

Alderfer

Inman

et al. 2008

Proceedings of the Institution of Mechanical Engineers, Part G:

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The use of planar laser-induced fluorescence (PLIF) of nitric oxide (NO) was inves-tigated for use in visualizing wake flowfields downstream of rapid prototyping models in a hypersonic wind tunnel. The re-entry models for use in this study were fabricated using a stereo-lithography apparatus. These models were produced in one day or less, which is a significant time savings compared with the manufacture of ceramic or metal models. The models were tested in the NASA Langley Research Center 31-Inch Mach 10 Air Tunnel. Pure NO was either seeded through tubes plumbed into the model or via a tube attached to the strut holding the model, which provided localized addition of NO into the model's wake through a porous metal cylinder attached to the end of the tube. Various entry capsule model types and configurations and NO-seeding methods were used, including a new streamwise visualization method based on PLIF. Virtual diagnostics interface technology, developed at NASA Langley Research Center, was used to visualize the datasets in post-processing. The use of calibration ‘dotcards’ was investigated to correct for camera perspective and lens distortions in the PLIF images.

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Visualization of a Capsule Entry Vehicle Reaction-Control System (RCS) Thruster

Cited by 12 publications

References 16 publications

Fluorescence Visualization of Hypersonic Flow Over Rapid Prototype Wind-Tunnel Models

Fluorescence Visualization of Hypersonic Flow Over Rapid Prototype Wind-Tunnel Models

Fluorescence Visualization of Hypersonic Flow Past Triangular and Rectangular Boundary-Layer Trips

Fluorescence imaging and streakline visualization of hypersonic flow over rapid prototype wind-tunnel models

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