Aerodynamic Optimization of a Turbocharger Unit Based on the Overall Efficiency Enhancement of an Internal Combustion Engine for Stationary Power Production

Iacopo Catalani, Andrea Agnolucci, F. Balduzzi, A. Bianchini, A. Arnone, G. Ferrara, G. Vichi, A. Bellissima, Ryota Minamino, G. Asai
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引用次数: 1

Abstract

In case of stationary power production, the matching between the turbocharger and the engine can be optimized around a specific operating point, rather than throughout a wide range like in automotive applications. This, in turn, may enable a finer optimization of the aerodynamic efficiency in comparison to existing industrial standards. The present study then reports a joint research activity aimed at defining an integrated approach to optimize the overall performance of an engine for stationary power production via a dedicated optimization of the turbocharger unit. In further detail, the aerodynamic optimization of the compressor, the turbine and the static parts is carried out by means of high-fidelity CFD simulations, while a 1D model of the powertrain is realized by means of the GT-Power software. An iterative procedure between the two simulation frameworks is established to account for the fluid dynamic connection between the engine and the turbocharger. Even though the selected case study was a “high quality” commercial product, the study shows how notable aerodynamic improvements can be achieved on turbocharger aerodynamics, thanks to the fact that the rangeability can be narrowed. Efficiency increases of 2.4% and of 3.4% have been reached for the compressor and the turbine, respectively. In the selected case study, this reflected into a moderate overall engine improvement (+0.5%), which however is not negligible in case of engine for stationary power production. Anyhow, the results suggest more promising prospects in case the methodology is applied since the early design of the engine.
基于固定式发电内燃机整体效率提升的涡轮增压器气动优化
在固定动力生产的情况下,涡轮增压器和发动机之间的匹配可以围绕特定的工作点进行优化,而不是像汽车应用那样在大范围内进行优化。与现有的工业标准相比,这反过来又可以使空气动力学效率得到更好的优化。本研究随后报告了一项联合研究活动,旨在定义一种综合方法,通过对涡轮增压器单元的专门优化来优化固定动力生产发动机的整体性能。通过高保真CFD仿真对压气机、涡轮和静态部件进行了气动优化,并利用GT-Power软件实现了动力总成的一维模型。建立了两个仿真框架之间的迭代程序,以考虑发动机与涡轮增压器之间的流体动力学连接。尽管所选择的案例研究是一个“高质量”的商业产品,但该研究表明,由于范围可以缩小,涡轮增压器的空气动力学可以实现显著的空气动力学改进。压缩机和涡轮机的效率分别提高了2.4%和3.4%。在选定的案例研究中,这反映了发动机整体的适度改进(+0.5%),然而,对于用于固定动力生产的发动机来说,这是不可忽略的。无论如何,结果表明,如果该方法应用于发动机的早期设计,更有希望的前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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