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ONE DIMENSIONAL MODELLING FOR PULSED FLOW TWIN-ENTRY TURBINE

机译:脉冲流动双入口涡轮机的一维建模

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One-dimensional (1D) modelling is critical for turboma-chinery unsteady performance prediction and system response assessment of internal combustion engines. This paper uses a novel 1D modelling (TURBODYNA) and proposes two additional features for the application to a twin-entry turbocharger turbine. Compared to single-entry turbines, twin-entry turbines enhance turbocharger transient response and reduce engine exhaust valve overlap periods. However, out-of-phase high frequency pulsating pressure waves lead to an unsteady mixing process from the two flows and pose great challenges to traditional 1D modelling. The present work resolves the mixing problem by directly solving mass, momentum and energy conservation equations during the mixing process instead of applying constant pressure assumption at the limb-rotor joint. Comparisons of TURBODYNA and an experimentally validated CFD suggest that TURBODYNA can not only provide a very good agreement on turbine performance, but also accurately capture unsteady features due to flow field inertial and pressure wave propagation. Levels of accuracy achieved by TURBODYNA have proved superior to traditional 1D modelling on turbine performance and the generality of the current 1D modelling has been explored by extending the application to another turbine featuring distinct characteristics. .
机译:一维(1D)建模对于涡轮瘤 - 中Chinery的不稳定性能预测和系统响应评估对内燃机至关重要。本文采用了一种新颖的1D建模(Turboyna),并提出了两个额外的特征,用于适用于双进入涡轮增压器涡轮机。与单入口涡轮机相比,双入口涡轮机增强涡轮增压器瞬态响应,减少发动机排气阀重叠时段。然而,超相的高频脉动压力波导致来自两个流动的不稳定混合过程,对传统的1D建模构成了巨大挑战。本作者通过在混合过程中直接求解质量,动量和节能方程而不是在肢体转子接头处施加恒压假设来解决混合问题。 Turboyna和实验验证的CFD的比较表明,Turboyna不仅可以在涡轮机性能方面提供非常良好的一致性,而且还可以在流场惯性和压力波传播中准确地捕获不稳定的功能。 Turboyna实现的精度水平证明,通过在涡轮机性能上优于传统的1D建模,并通过将应用扩展到具有不同特征的另一个涡轮机来探讨当前1D建模的一般性。 。

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