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研究了燃气轮机二次空气系统的非定常计算方法.通过将整个二次空气系统划分为两部分,特征“长”元件以及局部损失元件.特征线法用于单个特征“长”元件的求解,通过将连续方程、动量方程、能量方程构成的偏微分方程组转换为常微分方程组并联立求解,可以充分考虑内部流动与换热的相互影响;基于压力修正的流体网络法则用于由多个局部损失元件组成的局部流体网络,首先对动量方程组进行求解,进而对各自的能量方程进行求解.如何在采用这两种方法进行求解的上述两类元件之间进行数据交互将被讨论.此外,所提出的时间步长定义方法以及改进的元件计算模型使得二次空气系统的非定常分析得以实现.计算程序经与某系统定常实验数据及单个元件的非定常计算数据进行对比,在10s的计算时间内,基于特征线法得到结果与CFD数据偏差达到10.2%,结果表明该计算程序可以满足二次空气系统非定常计算的要求.
The unsteady calculation method of gas turbine secondary air system is studied. The whole secondary air system is divided into two parts, the characteristic “long” element and the partial loss element. The characteristic line method is used for the single characteristic “long” element The fluid network law based on pressure correction can be used to solve the problem by converting continuous equations, momentum equations, and energy equations into partial differential equations and solving them in parallel. A local fluid network composed of multiple local loss components first solves the equations of momentum and then solves their respective energy equations How data interaction between the two types of components solved by these two methods will be In addition, the proposed time-step definition method and the improved component calculation model enable the non-stationary analysis of the secondary air system to be realized.Compared with the steady experimental data of a system and the unsteady calculation data of a single component, In the 10s calculation time, the result based on the characteristic line method and the CFD data deviation of 10.2%, the results show that the meter Calculate the program to meet the secondary air system unsteady calculation requirements.