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首页> 外文期刊>Journal of turbomachinery >Unsteady Flow in a Turbocharger Centrifugal Compressor: Three-Dimensional Computational Fluid Dynamics Simulation and Numerical and Experimental Analysis of Impeller Blade Vibration
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Unsteady Flow in a Turbocharger Centrifugal Compressor: Three-Dimensional Computational Fluid Dynamics Simulation and Numerical and Experimental Analysis of Impeller Blade Vibration

机译：涡轮增压器离心压缩机中的非定常流动：三维计算流体动力学模拟以及叶轮叶片振动的数值和实验分析

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Experimental investigations on a single stage centrifugal compressor showed that measured blade vibration amplitudes vary considerably along a constant speed line from choke to surge. The unsteady flow has been analyzed to obtain detailed insight into the excitation mechanism. Therefore, a turbocharger compressor stage impeller has been modeled and simulated by means of computational fluid dynamics (CFD). Two operating points at off-design conditions were analyzed. One was close to choke and the second one close to the surge line. Transient CFD was employed, since only then a meaningful prediction of the blade excitation, caused by the unsteady flow situation, can be expected. Actually, it was observed that close to surge a steady state solution could not be obtained; only transient CFD could deliver a converged solution. The CFD results show the effect of the interaction between the inducer casing bleed system and the main flow. Additionally, the effect of the nonaxisymmetric components, such as the suction elbow and the discharge volute, was analyzed. The volute geometry itself had not been modeled. It turned out to be sufficient to impose a circumferentially asymmetric pressure distribution at the exit of the vaned diffuser to simulate the volute. Volute and suction elbow impose a circumferentially asymmetric flow field, which induces blade excitation. To understand the excitation mechanism, which causes the measured vibration behavior of the impeller, the time dependent pressure distribution on the impeller blades was transformed into the frequency domain by Fourier decomposition. The complex modal pressure data were imposed on the structure that was modeled by finite element methods (FEM). Following state-of-the-art calculations to analyze the free vibration behavior of the impeller, forced response calculations were carried out. Comparisons with the experimental results demonstrate that this employed methodology is capable of predicting the impeller's vibration behavior under real engine conditions. Integrating the procedure into the design of centrifugal compressors will enhance the quality of the design process.
机译：在单级离心压缩机上的实验研究表明，测得的叶片振动幅度沿着从扼流圈到喘振的恒定速度线变化很大。对非稳态流动进行了分析，以深入了解激发机理。因此，已经通过计算流体动力学（CFD）对涡轮增压器压缩机级叶轮进行了建模和仿真。分析了非设计条件下的两个工作点。一个靠近扼流圈，第二个靠近喘振线。使用瞬态CFD，因为只有这样，才能预期到由不稳定流动情况引起的叶片激励的有意义的预测。实际上，观察到不能获得接近喘振的稳态解；反之，只有瞬态CFD才能提供融合解决方案。 CFD结果显示了诱导器套管放气系统与主流之间相互作用的影响。此外，还分析了非轴对称组件（如吸入弯头和排放蜗壳）的影响。蜗壳的几何形状本身尚未建模。结果证明足以在叶片式扩散器的出口处施加周向不对称的压力分布以模拟蜗壳。蜗壳和吸气弯头施加了周向不对称的流场，从而引起叶片激励。为了了解引起叶轮振动行为的激励机制，通过傅立叶分解将叶轮叶片上随时间变化的压力分布转换为频域。复杂的模态压力数据被施加到通过有限元方法（FEM）建模的结构上。按照最新的计算方法来分析叶轮的自由振动行为，然后进行了强制响应计算。与实验结果的比较表明，这种采用的方法能够预测实际发动机条件下的叶轮振动行为。将程序集成到离心压缩机的设计中将提高设计过程的质量。

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