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基于SST全湍流伴随的尾桨翼型优化方法
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作者 孙钰锟 王珑 +2 位作者 王同光 马帅 钱耀如 《北京航空航天大学学报》 EI CAS CSCD 北大核心 2023年第12期3355-3364,共10页
为解决当前翼型优化中广泛使用的冻结湍流黏性假设存在的固有缺陷和基于Spalart-Allmaras(S-A)全湍流伴随中湍流模型对气动力计算精度较差的问题,提出一套新的翼型优化方法,其耦合了全湍流连续伴随求解、剪切应力传递(SST)湍流模型封闭... 为解决当前翼型优化中广泛使用的冻结湍流黏性假设存在的固有缺陷和基于Spalart-Allmaras(S-A)全湍流伴随中湍流模型对气动力计算精度较差的问题,提出一套新的翼型优化方法,其耦合了全湍流连续伴随求解、剪切应力传递(SST)湍流模型封闭的雷诺平均Navier-Stokes(RANS)方程、自由变形参数化方法和动网格变形技术。基于所提方法,在气动力系数相较于S-A模型有更高捕捉精度的基础上,对NPL9615翼型以最大升阻比为优化目标,并与冻结湍流黏性假设方法对比。结果表明:所提方法将原有翼型的升阻比提高了16.39%,而冻结湍流黏性假设方法获得最终翼型的升阻比仅提高了原有翼型的9.84%,说明所提方法在最优外形的获取上要领先于冻结湍流黏性假设,并且当翼型周围的湍流动能显著提高时,其优势愈发扩大。 展开更多
关键词 全湍流伴随 剪切应力传递 冻结湍流黏性假设 自由变形参数化方法 动网格技术 尾桨翼型
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Heat transfer intensification in hydromagnetic and radiative 3D unsteady flow regimes: A comparative theoretical investigation for aluminum and γ-aluminum oxides nanoparticles 被引量:2
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作者 Naveed AHMED ADNAN +3 位作者 Umar KHAN Syed Zulfiqar Ali ZAIDI Imran FAISAL Syed Tauseef MOHYUD-DIN 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第5期1233-1249,共17页
This article investigates the colloidal study for water and ethylene glycol based nanofluids.The effects of Lorentz forces and thermal radiation are considered.The process of non-dimensionalities of governing equation... This article investigates the colloidal study for water and ethylene glycol based nanofluids.The effects of Lorentz forces and thermal radiation are considered.The process of non-dimensionalities of governing equations is carried out successfully by means of similarity variables.Then,the resultant nonlinear nature of flow model is treated numerically via Runge-Kutta scheme.The characteristics of various pertinent flow parameters on the velocity,temperature,streamlines and isotherms are discussed graphically.It is inspected that the Lorentz forces favors the rotational velocity and rotational parameter opposes it.Intensification in the nanofluids temperature is observed for volumetric fraction and thermal radiation parameter and dominating trend is noted for γ-aluminum nanofluid.Furthermore,for higher rotational parameter,reverse flow is investigated.To provoke the validity of the present work,comparison between current and literature results is presented which shows an excellent agreement.It is examined that rotation favors the velocity of the fluid and more radiative fluid enhances the fluid temperature.Moreover,it is inspected that upturns in volumetric fraction improves the thermal and electrical conductivities. 展开更多
关键词 conventional fluids aluminum and γ-aluminum oxides magnetic field thermal radiation Runge-Kutta scheme shear stress local rate of heat transfer
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