{"title":"估计火星大气中飞行板块上层流-湍流转变的起始时间","authors":"Yu. N. Grigor’ev, I. V. Ershov","doi":"10.1134/S0015462823603212","DOIUrl":null,"url":null,"abstract":"<p>Comparative calculations of the location of the onset of the laminar-turbulent transition zone are performed using the e<sup><i>N</i></sup>-method for two points on the Mars “Pathfinder” entry trajectory. A three-component model of thermochemically nonequilibrium CO<sub>2</sub>–CO–O mixture is used in the calculations. The set of spatial disturbance frequencies is found using neutral curves for the first unstable modes of temporary disturbances. The transition Reynolds number Re<sub>δ<i>T</i></sub> is determined from the envelopes of families of <i>N</i>-factor curves at <i>N</i><sub><i>T</i></sub> = 8. In the hypersonic regime at M = 12.6, taking into account the developed thermochemical nonequilibrium leads to a significant decrease in the static temperature of gas in the lower part of the boundary layer. As a result, the onset of the laminar-turbulent transition zone is displaced downstream by approximately 9% as compared to the case of a perfect gas.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 2","pages":"169 - 182"},"PeriodicalIF":1.0000,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Estimate of the Onset of Laminar-Turbulent Transition on a Plate in Flight in the Mars Atmosphere\",\"authors\":\"Yu. N. Grigor’ev, I. V. Ershov\",\"doi\":\"10.1134/S0015462823603212\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Comparative calculations of the location of the onset of the laminar-turbulent transition zone are performed using the e<sup><i>N</i></sup>-method for two points on the Mars “Pathfinder” entry trajectory. A three-component model of thermochemically nonequilibrium CO<sub>2</sub>–CO–O mixture is used in the calculations. The set of spatial disturbance frequencies is found using neutral curves for the first unstable modes of temporary disturbances. The transition Reynolds number Re<sub>δ<i>T</i></sub> is determined from the envelopes of families of <i>N</i>-factor curves at <i>N</i><sub><i>T</i></sub> = 8. In the hypersonic regime at M = 12.6, taking into account the developed thermochemical nonequilibrium leads to a significant decrease in the static temperature of gas in the lower part of the boundary layer. As a result, the onset of the laminar-turbulent transition zone is displaced downstream by approximately 9% as compared to the case of a perfect gas.</p>\",\"PeriodicalId\":560,\"journal\":{\"name\":\"Fluid Dynamics\",\"volume\":\"59 2\",\"pages\":\"169 - 182\"},\"PeriodicalIF\":1.0000,\"publicationDate\":\"2024-05-08\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Fluid Dynamics\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://link.springer.com/article/10.1134/S0015462823603212\",\"RegionNum\":4,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"MECHANICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Fluid Dynamics","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1134/S0015462823603212","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MECHANICS","Score":null,"Total":0}
引用次数: 0
摘要
摘要 对火星 "探路者 "进入轨迹上的两个点使用 eN 方法对层流-湍流过渡带的起始位置进行了比较计算。计算中使用了热化学非平衡 CO2-CO-O 混合物的三组分模型。利用临时扰动的第一种不稳定模式的中性曲线找到了一组空间扰动频率。过渡雷诺数 ReδT 是根据 NT = 8 时 N 因子曲线族的包络线确定的。 在 M = 12.6 时的高超声速状态下，考虑到已形成的热化学非平衡会导致边界层下部的气体静态温度显著下降。因此，与完美气体相比，层流-湍流过渡区的起始点向下游移动了约 9%。
Estimate of the Onset of Laminar-Turbulent Transition on a Plate in Flight in the Mars Atmosphere
Comparative calculations of the location of the onset of the laminar-turbulent transition zone are performed using the eN-method for two points on the Mars “Pathfinder” entry trajectory. A three-component model of thermochemically nonequilibrium CO2–CO–O mixture is used in the calculations. The set of spatial disturbance frequencies is found using neutral curves for the first unstable modes of temporary disturbances. The transition Reynolds number ReδT is determined from the envelopes of families of N-factor curves at NT = 8. In the hypersonic regime at M = 12.6, taking into account the developed thermochemical nonequilibrium leads to a significant decrease in the static temperature of gas in the lower part of the boundary layer. As a result, the onset of the laminar-turbulent transition zone is displaced downstream by approximately 9% as compared to the case of a perfect gas.
期刊介绍：
Fluid Dynamics is an international peer reviewed journal that publishes theoretical, computational, and experimental research on aeromechanics, hydrodynamics, plasma dynamics, underground hydrodynamics, and biomechanics of continuous media. Special attention is given to new trends developing at the leading edge of science, such as theory and application of multi-phase flows, chemically reactive flows, liquid and gas flows in electromagnetic fields, new hydrodynamical methods of increasing oil output, new approaches to the description of turbulent flows, etc.
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