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燃气轮机空气冷却系统建模及计算分析 被引量:7
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作者 王松 王新军 俞茂铮 《燃气轮机技术》 2010年第4期33-37,共5页
本文以某型燃气轮机透平叶片的空气冷却系统为研究对象。在分析叶片的内部冷却方式、结构及冷却空气流路构成的基础上,将空气冷却系统模化为由大量不同的通流单元以串连或分支方式组成的复杂网络系统。选用适当的经验关系式或试验关联... 本文以某型燃气轮机透平叶片的空气冷却系统为研究对象。在分析叶片的内部冷却方式、结构及冷却空气流路构成的基础上,将空气冷却系统模化为由大量不同的通流单元以串连或分支方式组成的复杂网络系统。选用适当的经验关系式或试验关联式计算空气流经各通流单元的压力损失与换热量,建立了描述冷却空气流动与换热特性的流量方程组、压力方程组和温度方程组。采用逐步简化空气冷却系统的方式,求解空气冷却系统内流量的分配。采用以改进并修正的高斯消去法为基础的一种稳定的大型稀疏矩阵线性方程组解法来求解空气冷却系统内空气的压力与温度分布。可以计算得到各流路的压力、温度和流量的分布等参数。 展开更多
关键词 空气冷却系统 流量方程组 压力方程组 温度方程组
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Navier-Stokes方程的一种等阶稳定化亏量校正有限元法 被引量:6
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作者 覃燕梅 冯民富 尹蕾 《计算数学》 CSCD 北大核心 2010年第1期1-14,共14页
本文对粘性不可压缩Navier-Stokes方程提出了一种等阶稳定化亏量校正有限元法.将通常的压力投影稳定化方法与亏量校正思想相结合,建立了一种稳定的有限元格式,绕开了inf-sup条件的限制,并且克服了当粘性系数很小时造成的不稳定性.对速度... 本文对粘性不可压缩Navier-Stokes方程提出了一种等阶稳定化亏量校正有限元法.将通常的压力投影稳定化方法与亏量校正思想相结合,建立了一种稳定的有限元格式,绕开了inf-sup条件的限制,并且克服了当粘性系数很小时造成的不稳定性.对速度/压力采用等阶多项式空间,证明了解的存在唯一性,给出了误差估计.误差估计的结果表明,每校正一步误差的精度提高一阶. 展开更多
关键词 NAVIER-STOKES方程 亏量校正 压力投影 粘性系数
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Mechanics analysis of axisymmetric thin-walled part in warm sheet hydroforming 被引量:2
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作者 Yang Xiying Lang Lihui +1 位作者 Liu Kangning Liu Baosheng 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2015年第5期1546-1554,共9页
To obtain the influence of fluid pressure and temperature on warm hydroforming of 5A06-O aluminum alloy sheet, the unified mechanics equilibrium equations, which take through- thickness normal stress and friction into... To obtain the influence of fluid pressure and temperature on warm hydroforming of 5A06-O aluminum alloy sheet, the unified mechanics equilibrium equations, which take through- thickness normal stress and friction into account, were established in spherical coordinate system. The distribution of through-thickness normal stress in the thickness direction was determined. The relation between through-thickness normal stress and fluid pressure was also analyzed in different regions of cylindrical cup. Based on the method of subtracting one increasing function from another, the constitutive equation of 5A06-O applied to warm hydroforming was established and in a good agreement with uniaxial tensile data. Based on whether the thickness variation was taken into account, two mechanic models were established to do the comparative study. The results for the studied case show that the calculated stress values are pretty close according to the two models and consistent with results of finite element analysis; the thickness distribution in flange computed by the second model conforms to the experimental data. Finally, the influences of fluid pressure on the flange thickness and radial stress were analyzed. 展开更多
关键词 5A06-O aluminum alloy:Constitutive equations:Fluid pressure:Through-thickness normalstress Warm sheet hydroforming
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