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 | | 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法，我们为您准备了出自英文原文的大量英语例句，供您参考。 | |
A generalized reference enthalpy formulation for the skin friction, heat transfer and radiation-equilibrium temperature distributions over aerodynamic surfaces in attached hypersonic / hyperenthalpic flow is proposed.
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Generalized reference enthalpy formulations and simulation of viscous effects in hypersonic flow
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In the end, comparing the experimental results with reference enthalpy theoretical results, a conclusion of thermal measurement accuracy is drawn.
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The next two sections are devoted to the solution of a problem to find an equilibrium constant from reference enthalpy and entropy data.
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| In this paper, a method of calculation of heat-transfer rate for blunt-bodies in the case of hypersonic turbulent boundary-layer is presented. In order to transform the compressible and axisymmetrical turbulent boundary-layer flow to an incompressible and two-dimensional turbulent boundary-layer flow, the Mager - - Mangier transformation has been applied. According to the characteristics of hypersonic, turbulent boundary-layer with favourable pressure gradient, the classical single-parameter representation has... In this paper, a method of calculation of heat-transfer rate for blunt-bodies in the case of hypersonic turbulent boundary-layer is presented. In order to transform the compressible and axisymmetrical turbulent boundary-layer flow to an incompressible and two-dimensional turbulent boundary-layer flow, the Mager - - Mangier transformation has been applied. According to the characteristics of hypersonic, turbulent boundary-layer with favourable pressure gradient, the classical single-parameter representation has been chosen for skin-friction and the form factor in the momentum equation; and the error introduced by the transformation is corrected by a suitable choice of the gas temperature according to Eckert's reference enthalpy. Finally, the heat transfer coefficient is obtained by the corrected Reynolds analogy. The results agree well with the available experiments. | 本文针对沿钝体表面的湍流热交换率作了理论分析和计算.本文采用了联合转换式把可压缩轴对称边界层问题转化为不可压缩平面问题,并根据超高速顺压力梯度湍流边界层的特点,在动量积分方程中引用经典的单参数的摩擦阻力律和型参数,然后按Eckert参考焓针对气体性质的误差作了修正.最后,根据近似Reynolds比拟关系求得热交换率.计算给果与实验给果是比较符合的. | This paper extends the reference enthalpy method in boundary layer theory to the two dimensional and axisymmetrieal three dimensional flow with pressure gradient, the formulae for calculating the momentum thickness and friction coefficient along the body surface are obtained. The approximate relationships among various thicknesses are derived by using some related results of. the boundary layer theory. It is shown that the present formulae are in good agreement with the related experimental data and are... This paper extends the reference enthalpy method in boundary layer theory to the two dimensional and axisymmetrieal three dimensional flow with pressure gradient, the formulae for calculating the momentum thickness and friction coefficient along the body surface are obtained. The approximate relationships among various thicknesses are derived by using some related results of. the boundary layer theory. It is shown that the present formulae are in good agreement with the related experimental data and are fairly satisfactory as compared with the current formulae under special conditions. | 本文把边界层理论中的参考焓方法推广到具有压力梯度的二维和三维轴对称流动,得到了物面动量厚度和摩阻的计算公式.同时利用边界层理论的某些成果推导了边界层各种厚度之间的近似关系.所得公式计算方便,与目前流行的但只适用于特殊情况的公式和有关的实验数据的比较表明,本文的结果是满意的. | The previous expressions for the heat flux to a cylinder immersed in a thermal plasma cross flow have been improved in this paper by means of computational analysis. The temperature corresponding to the reference enthalpy or the average enthalpy under low plasma tempera- ture is recommended as the reference temperature for the heat flux calculation without any correction concerning the property assumptions. A value of the concentration coefficient of the heat flux on the frontal semicylinder,... The previous expressions for the heat flux to a cylinder immersed in a thermal plasma cross flow have been improved in this paper by means of computational analysis. The temperature corresponding to the reference enthalpy or the average enthalpy under low plasma tempera- ture is recommended as the reference temperature for the heat flux calculation without any correction concerning the property assumptions. A value of the concentration coefficient of the heat flux on the frontal semicylinder, 0.75, is shown to be applicable to a wider region of parameters. | 用计算研究的办法，本文对以前得出的热等离子体横向统流圆柱体传热条件下的热流表达式做了两点改进：①建议采用参考焓所对应的温度作为选取物性的参考温度．在等离子体温度较低时，也可用所对应的温度作为参考温度；②在相当宽阔的实验参数范围内，前半圆柱的热流集中系数可取为０．７５，这有助于扩展理论结果的使用范围。 | | | | << 更多相关文摘 |
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reference enthalpy
参考焓
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