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针对并联矩形通道,基于集总参数法建立了并联通道流动不稳定性分析模型,并基于此模型分析了非对称工况对系统稳定性的影响。分析结果表明,非对称工况对并联通道流动不稳定性有显著影响,在保持平均节流系数恒定的情况下,非对称节流的影响随压力增大而降低,随质量流速增大而增大;界限功率随加热不对称度增加呈先上升后下降趋势,且非对称加热的影响随压力增大而增大,随入口过冷度和质量流速增大而减小。
For the parallel rectangular channel, a parallel channel flow instability analysis model is established based on the lumped parameter method. Based on the model, the influence of the asymmetrical working condition on the system stability is analyzed. The results show that the unsymmetrical condition has a significant influence on the flow instability in the parallel passage. The effect of asymmetric throttling decreases with the increase of the pressure while the average throttling coefficient is kept constant, but increases with the increase of the mass flow rate The boundary power increases first and then decreases with increasing heating asymmetry, and the influence of asymmetric heating increases with pressure and decreases with inlet undercooling and mass flow rate.