F. Bariselli, S. Boccelli, T. Magin, A. Frezzotti, A. Hubin
{"title":"Aerothermodynamic modelling of meteor entry flows in the rarefied regime","authors":"F. Bariselli, S. Boccelli, T. Magin, A. Frezzotti, A. Hubin","doi":"10.2514/6.2018-4180","DOIUrl":"https://doi.org/10.2514/6.2018-4180","url":null,"abstract":"","PeriodicalId":423948,"journal":{"name":"2018 Joint Thermophysics and Heat Transfer Conference","volume":"70 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120867335","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}
D. Driver, D. Philippidis, Imelda Terrazas-Salinas
Recent introduction of Coaxial Thermocouple type calorimeters into the NASA Ames arc jet facilities has inspired an analysis of 2D conduction effects internal to this type of calorimeter. Lateral conduction effects violate the 1D finite slab inverse analysis which is typically used to deduce the heat transfer to such calorimeters. The spherical shaped nose associated with most calorimeters (rather than flat) leads to a bias error that over-estimates the stagnation heating. Non-uniform heating on the face of spherically shaped calorimeters leads to conduction losses to the colder rim of the calorimeter which causes an underestimate of the stagnation heating. These two effects come into play at different times of the calorimeter's exposure to the arc jet, so they do not cancel. The spherical body effects come into play in the early stages of exposure, while the non-uniform heating effect becomes most severe at the later stages of exposure. The bias associated with spherical effects can be avoided by rewriting the 1D finite slab inverse analysis code to solve for 1D conduction in spherical coordinates. However, reducing the bias error associated non-uniform heating requires a somewhat ad hoc modification to the 1D finite element inverse analysis.
{"title":"Uncertainty Analysis of Coaxial Thermocouple Calorimeters used in Arc Jets","authors":"D. Driver, D. Philippidis, Imelda Terrazas-Salinas","doi":"10.2514/6.2018-3770","DOIUrl":"https://doi.org/10.2514/6.2018-3770","url":null,"abstract":"Recent introduction of Coaxial Thermocouple type calorimeters into the NASA Ames arc jet facilities has inspired an analysis of 2D conduction effects internal to this type of calorimeter. Lateral conduction effects violate the 1D finite slab inverse analysis which is typically used to deduce the heat transfer to such calorimeters. The spherical shaped nose associated with most calorimeters (rather than flat) leads to a bias error that over-estimates the stagnation heating. Non-uniform heating on the face of spherically shaped calorimeters leads to conduction losses to the colder rim of the calorimeter which causes an underestimate of the stagnation heating. These two effects come into play at different times of the calorimeter's exposure to the arc jet, so they do not cancel. The spherical body effects come into play in the early stages of exposure, while the non-uniform heating effect becomes most severe at the later stages of exposure. The bias associated with spherical effects can be avoided by rewriting the 1D finite slab inverse analysis code to solve for 1D conduction in spherical coordinates. However, reducing the bias error associated non-uniform heating requires a somewhat ad hoc modification to the 1D finite element inverse analysis.","PeriodicalId":423948,"journal":{"name":"2018 Joint Thermophysics and Heat Transfer Conference","volume":"296 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":"114399830","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":"Overview of the second test-flight of the Kentucky Re-entry Universal Payload System (KRUPS)","authors":"J. D. Sparks, Alexandre Martin","doi":"10.2514/6.2018-3589","DOIUrl":"https://doi.org/10.2514/6.2018-3589","url":null,"abstract":"","PeriodicalId":423948,"journal":{"name":"2018 Joint Thermophysics and Heat Transfer Conference","volume":"43 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":"121659488","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}
G. Cushman, A. Alunni, J. Balboni, P. Zell, J. Hartman, D. Empey
LEAF-Lite (Laser Enhanced Arc-Jet Facility) is a radiative laser heating facility that has been added to the 60 MW Interaction Heating Facility (IHF) convective plasma arc-jet located at NASA Ames Research Center. Together, these two systems can simulate both convective and radiative heating at heat fluxes reaching 551 W/cm 2 by simultaneously combining a highest measured heat flux of 160 W/cm 2 convective and 391 W/cm 2 radiative heating on a 152-mm x 152-mm wedge model configuration. Adding radiant heating to an existing convective facility better simulates Earth atmospheric entry from hyperbolic lunar-return speeds. The radiative heat is provided by multiple 50-kW CW IR lasers, which is nearly uniform across the illuminated surface with a total variation less than 6%, while the convective heat is provided by a high enthalpy plasma arc-jet. In a later phase, the facility will expand to test panel test articles of 432-mm x 432-mm and provide 100 W/cm 2 of radiative heating in a plasma convective flow environment. The paper describes this new combined heating capability, its current testing conditions, and the unique application of the laser system with respect to the Orion test flight lunar orbits.
{"title":"The Laser Enhanced Arc-Jet Facility (LEAF-Lite): Simulating Convective and Radiative Heating with Arc-jets and Multiple 50-kW CW Lasers","authors":"G. Cushman, A. Alunni, J. Balboni, P. Zell, J. Hartman, D. Empey","doi":"10.2514/6.2018-3273","DOIUrl":"https://doi.org/10.2514/6.2018-3273","url":null,"abstract":"LEAF-Lite (Laser Enhanced Arc-Jet Facility) is a radiative laser heating facility that has been added to the 60 MW Interaction Heating Facility (IHF) convective plasma arc-jet located at NASA Ames Research Center. Together, these two systems can simulate both convective and radiative heating at heat fluxes reaching 551 W/cm 2 by simultaneously combining a highest measured heat flux of 160 W/cm 2 convective and 391 W/cm 2 radiative heating on a 152-mm x 152-mm wedge model configuration. Adding radiant heating to an existing convective facility better simulates Earth atmospheric entry from hyperbolic lunar-return speeds. The radiative heat is provided by multiple 50-kW CW IR lasers, which is nearly uniform across the illuminated surface with a total variation less than 6%, while the convective heat is provided by a high enthalpy plasma arc-jet. In a later phase, the facility will expand to test panel test articles of 432-mm x 432-mm and provide 100 W/cm 2 of radiative heating in a plasma convective flow environment. The paper describes this new combined heating capability, its current testing conditions, and the unique application of the laser system with respect to the Orion test flight lunar orbits.","PeriodicalId":423948,"journal":{"name":"2018 Joint Thermophysics and Heat Transfer Conference","volume":"21 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":"134500763","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}
J. Cooper, Olivia M. Schroeder, H. Weng, Alexandre Martin
{"title":"Implementation and Verification of a Surface Recession Module in a Finite Volume Ablation Solver","authors":"J. Cooper, Olivia M. Schroeder, H. Weng, Alexandre Martin","doi":"10.2514/6.2018-3272","DOIUrl":"https://doi.org/10.2514/6.2018-3272","url":null,"abstract":"","PeriodicalId":423948,"journal":{"name":"2018 Joint Thermophysics and Heat Transfer Conference","volume":"384 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":"133335804","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":"First-Principle Calculations of Collision Integrals for N2-O System","authors":"Han Luo, S. Macheret, Alina A. Alexeenko","doi":"10.2514/6.2018-3586","DOIUrl":"https://doi.org/10.2514/6.2018-3586","url":null,"abstract":"","PeriodicalId":423948,"journal":{"name":"2018 Joint Thermophysics and Heat Transfer Conference","volume":"49 2 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":"131703506","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}
Peter Forsyth, M. McGilvray, R. Pearce, D. Gillespie
Transient liquid crystal experiments can provide high fidelity heat transfer data for complex geometries, particularly for internal geometries where IR cameras cannot be applied. However, one main drawback of applying the technique to internal geometries is the accurate definition of the driving gas temperature and the need to define it locally in the streamwise direction. Additionally, due to transient changes in the driving gas streamwise profile, the comparison to steady state CFD has been questioned. This paper explores simulating the transient behaviour of the experiment directly. A novel technique to account for differences in the applicable time scales is developed, where the solid surface temperature is calculated analytically using the impulse response method for a semi-infinite conduction and coupled to CFD solver directly. This is compared to the application of transient conjugate heat transfer. Both numerical methods are applied to simulate a transient liquid crystal experiment of a stationary super-scaled rib turbulated internal cooling passage. The surface temperature from the numerical results is post-processed using the method applied in the experiment to ensure direct comparison. Results show that calculations using the new analytical method and steady state gave very similar Nusselt number distributions and mean value in relation to the experimental data. Analysis of transient variation of Nusselt number indicated localised maximum variations up to 40%, though this was not found to significantly effect the minimised global values.
{"title":"Direct Simulation of Internal Flow Transient Liquid Crystal Experiments","authors":"Peter Forsyth, M. McGilvray, R. Pearce, D. Gillespie","doi":"10.2514/6.2018-4289","DOIUrl":"https://doi.org/10.2514/6.2018-4289","url":null,"abstract":"Transient liquid crystal experiments can provide high fidelity heat transfer data for complex geometries, particularly for internal geometries where IR cameras cannot be applied. However, one main drawback of applying the technique to internal geometries is the accurate definition of the driving gas temperature and the need to define it locally in the streamwise direction. Additionally, due to transient changes in the driving gas streamwise profile, the comparison to steady state CFD has been questioned. This paper explores simulating the transient behaviour of the experiment directly. A novel technique to account for differences in the applicable time scales is developed, where the solid surface temperature is calculated analytically using the impulse response method for a semi-infinite conduction and coupled to CFD solver directly. This is compared to the application of transient conjugate heat transfer. Both numerical methods are applied to simulate a transient liquid crystal experiment of a stationary super-scaled rib turbulated internal cooling passage. The surface temperature from the numerical results is post-processed using the method applied in the experiment to ensure direct comparison. Results show that calculations using the new analytical method and steady state gave very similar Nusselt number distributions and mean value in relation to the experimental data. Analysis of transient variation of Nusselt number indicated localised maximum variations up to 40%, though this was not found to significantly effect the minimised global values.","PeriodicalId":423948,"journal":{"name":"2018 Joint Thermophysics and Heat Transfer Conference","volume":"39 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":"131742656","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":"Extreme Incident Radiative Heat Flux Environment Tests at Intermediate Scale","authors":"A. Ricks, Alexander L. Brown, J. Christian","doi":"10.2514/6.2018-3763","DOIUrl":"https://doi.org/10.2514/6.2018-3763","url":null,"abstract":"","PeriodicalId":423948,"journal":{"name":"2018 Joint Thermophysics and Heat Transfer Conference","volume":"52 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":"131772339","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}
Marcos R. Espinosa, Graham K. Webster, Gregory T. Coll, Brian M. Nufer, M. Kandula, Thomas J. Aranyos
{"title":"Internal Depressurization of Hydrazine with Application to In-Orbit Satellite Refueling","authors":"Marcos R. Espinosa, Graham K. Webster, Gregory T. Coll, Brian M. Nufer, M. Kandula, Thomas J. Aranyos","doi":"10.2514/6.2018-3913","DOIUrl":"https://doi.org/10.2514/6.2018-3913","url":null,"abstract":"","PeriodicalId":423948,"journal":{"name":"2018 Joint Thermophysics and Heat Transfer Conference","volume":"11 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":"134321463","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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