J. Supowit, Christopher H. Baker, Bailey Zhao, John P. McHale, Ryan Miller, P. Pichardo, C. Zuhlke, Nicholas Roth, A. Tsubaki, Mahdi Mohammadi-Ghaleni, S. Nejati, D. Alexander
{"title":"Thermal Cycle Testing of Titanium Superhydrophobic Surfaces for a Spacecraft Jumping Droplet Thermal Diode","authors":"J. Supowit, Christopher H. Baker, Bailey Zhao, John P. McHale, Ryan Miller, P. Pichardo, C. Zuhlke, Nicholas Roth, A. Tsubaki, Mahdi Mohammadi-Ghaleni, S. Nejati, D. Alexander","doi":"10.2514/6.2018-2946","DOIUrl":"https://doi.org/10.2514/6.2018-2946","url":null,"abstract":"","PeriodicalId":423948,"journal":{"name":"2018 Joint Thermophysics and Heat Transfer Conference","volume":"72 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":"116902779","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":"A Numerical Model of the Blade Element Momentum Method for Rotating Airfoils with Heat Transfer Calculation","authors":"A. Samad, F. Morency, C. Volat","doi":"10.2514/6.2018-4077","DOIUrl":"https://doi.org/10.2514/6.2018-4077","url":null,"abstract":"","PeriodicalId":423948,"journal":{"name":"2018 Joint Thermophysics and Heat Transfer Conference","volume":"10 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":"117013705","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":"Aerothermodynamic Shape Optimization of Reentry Capsule","authors":"H. Kutkan, S. Eyi","doi":"10.2514/6.2018-4071","DOIUrl":"https://doi.org/10.2514/6.2018-4071","url":null,"abstract":"","PeriodicalId":423948,"journal":{"name":"2018 Joint Thermophysics and Heat Transfer Conference","volume":"6 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":"129684344","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}
A. Diwakar, Veda Krishna Vyas Ramasahayam, K. Bodi
{"title":"Comparison of Different Approaches for Numerical Simulation of High Enthalpy Flows at Thermochemical Equilibrium","authors":"A. Diwakar, Veda Krishna Vyas Ramasahayam, K. Bodi","doi":"10.2514/6.2018-3269","DOIUrl":"https://doi.org/10.2514/6.2018-3269","url":null,"abstract":"","PeriodicalId":423948,"journal":{"name":"2018 Joint Thermophysics and Heat Transfer Conference","volume":"116 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":"132315159","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":"Calculation of the Spectral Hemispherical Emissivity of an Arbitrarily Orientated Uniaxial Crystal","authors":"Xiaohu Wu, C. Fu, Zhuomin M. Zhang","doi":"10.2514/6.2018-4075","DOIUrl":"https://doi.org/10.2514/6.2018-4075","url":null,"abstract":"","PeriodicalId":423948,"journal":{"name":"2018 Joint Thermophysics and Heat Transfer Conference","volume":"8 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":"134093549","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}
M. Priyadarshini, A. Munafò, A. Brandis, B. Cruden, M. Panesi
In this work, a one-dimensional methodology for simulating shock tubes is developed. The model accounts for the viscous interactions of the shock with the shock tube wall by adding an area change source term in the 1-D conservation equations corresponding to the boundary layer growth. This source term corresponds to the mass and energy going into the boundary layer. The boundary layer growth is computed using a simple model with a scaling factor. This scale factor is used to tailor a solution to match the deceleration profile of a shock tube test. In doing so, not only will the source term take into account boundary layer losses, it will also cover any effect due to radiative cooling loses from the gas. For this study, the Electric Arc Shock Tube(EAST) facility at NASA Ames Research Center is modeled for Earth reentry conditions. The purpose of this paper is to investigate if anomalies identified for certain conditions in the EAST data are due to shock deceleration. These anomalies include measuring electron number density above equilibrium predictions and observing that radiance profiles can continually increase behind the shock, never reaching steady state, for certain shots (typically those less than 10 km/s). An eleven species air mixture is chosen to study the chemistry of the flow. Comparisons of the simulations to the experimental results are presented. Good agreement with the shock deceleration profiles was achieved by tuning in the boundary layer scale factor. The temperature as well as electron number density increases behind the shock, as has also been observed in the experiments. Finally, radiance comparisons between results from NEQAIR and experiments also show good agreement for some shots, but significant discrepancies are still observed for others. shows that the experiments record an increase in the radiation behind the shock which is captured by the viscous simulation. This increase in radiance is due to the fact that the temperature behind the shock front increases as the gas further away from the shock was shocked at a higher velocity. In the IR region, there is no steady state radiance as can be seen from the figures. Hence, using this model can potentially provide an avenue to understand the data obtained from the experiments. There is a dramatic increase in the radiance in the IR region when compared to the UV region in the EAST data which is also observed in the simulations. The radiance data in the VUV region shows that it is steady. The simulations show radiance increase in this region as well.
{"title":"One-dimensional modeling methodology for shock tubes: Application to the EAST facility","authors":"M. Priyadarshini, A. Munafò, A. Brandis, B. Cruden, M. Panesi","doi":"10.2514/6.2018-4181","DOIUrl":"https://doi.org/10.2514/6.2018-4181","url":null,"abstract":"In this work, a one-dimensional methodology for simulating shock tubes is developed. The model accounts for the viscous interactions of the shock with the shock tube wall by adding an area change source term in the 1-D conservation equations corresponding to the boundary layer growth. This source term corresponds to the mass and energy going into the boundary layer. The boundary layer growth is computed using a simple model with a scaling factor. This scale factor is used to tailor a solution to match the deceleration profile of a shock tube test. In doing so, not only will the source term take into account boundary layer losses, it will also cover any effect due to radiative cooling loses from the gas. For this study, the Electric Arc Shock Tube(EAST) facility at NASA Ames Research Center is modeled for Earth reentry conditions. The purpose of this paper is to investigate if anomalies identified for certain conditions in the EAST data are due to shock deceleration. These anomalies include measuring electron number density above equilibrium predictions and observing that radiance profiles can continually increase behind the shock, never reaching steady state, for certain shots (typically those less than 10 km/s). An eleven species air mixture is chosen to study the chemistry of the flow. Comparisons of the simulations to the experimental results are presented. Good agreement with the shock deceleration profiles was achieved by tuning in the boundary layer scale factor. The temperature as well as electron number density increases behind the shock, as has also been observed in the experiments. Finally, radiance comparisons between results from NEQAIR and experiments also show good agreement for some shots, but significant discrepancies are still observed for others. shows that the experiments record an increase in the radiation behind the shock which is captured by the viscous simulation. This increase in radiance is due to the fact that the temperature behind the shock front increases as the gas further away from the shock was shocked at a higher velocity. In the IR region, there is no steady state radiance as can be seen from the figures. Hence, using this model can potentially provide an avenue to understand the data obtained from the experiments. There is a dramatic increase in the radiance in the IR region when compared to the UV region in the EAST data which is also observed in the simulations. The radiance data in the VUV region shows that it is steady. The simulations show radiance increase in this region as well.","PeriodicalId":423948,"journal":{"name":"2018 Joint Thermophysics and Heat Transfer Conference","volume":"1 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":"128780849","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":"Modeling of Gas-Phase Chemical Kinetics for Pyrolyzing Ablators","authors":"Samuel Y. Chen, I. Boyd, N. Martin, D. Fletcher","doi":"10.2514/6.2018-3274","DOIUrl":"https://doi.org/10.2514/6.2018-3274","url":null,"abstract":"","PeriodicalId":423948,"journal":{"name":"2018 Joint Thermophysics and Heat Transfer Conference","volume":"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":"129790348","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":"Conjugate Analyses of Ablation in the HIPPO Nozzle","authors":"Peter G. Cross, I. Boyd","doi":"10.2514/6.2018-3271","DOIUrl":"https://doi.org/10.2514/6.2018-3271","url":null,"abstract":"","PeriodicalId":423948,"journal":{"name":"2018 Joint Thermophysics and Heat Transfer Conference","volume":"24 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":"115877541","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：