Modern low pressure turbines (LPT) feature high pressure ratios and moderate Mach and Reynolds numbers, increasing the possibility of laminar boundary-layer separation on the blades. Upstream disturbances including background turbulence and incoming wakes have a profound effect on the behavior of separation bubbles and the type/location of laminar-turbulent transition and therefore need to be considered in LPT design. Unsteady Reynolds-averaged Navier–Stokes (URANS) are often found inadequate to resolve the complex wake dynamics and impact of these environmental parameters on the boundary layers and may not drive the design to the best aerodynamic efficiency. LES can partly improve the accuracy, but has difficulties in predicting boundary layer transition and capturing the delay of laminar separation with varying inlet turbulence levels. Direct numerical simulation (DNS) is able to overcome these limitations but has to date been considered too computationally expensive. Here, a novel compressible DNS code is presented and validated, promising to make DNS practical for LPT studies. Also, the sensitivity of wake loss coefficient with respect to freestream turbulence levels below 1% is discussed.

Richard D. Sandberg

Vittorio Michelassi

Richard Pichler

Liwei Chen

Roderick Johnstone

Journal of Turbomachinery

The Journal of Turbomachinery publishes archival-quality, peer-reviewed technical papers that advance the state-of-the-art of turbomachinery technology related to gas turbine engines. The broad scope of the subject matter includes the fluid dynamics, heat transfer, and aeromechanics technology associated with the design, analysis, modeling, testing, and performance of turbomachinery. Emphasis is placed on gas-path technologies associated with axial compressors, centrifugal compressors, and turbines.

Topics: Aerodynamic design, analysis, and test of compressor and turbine blading; Compressor stall, surge, and operability issues; Heat transfer phenomena and film cooling design, analysis, and testing in turbines; Aeromechanical instabilities; Computational fluid dynamics (CFD) applied to turbomachinery, boundary layer development, measurement techniques, and cavity and leaking flows.

The Journal of Turbomachinery publishes high-quality, peer-reviewed technical papers that advance the state-of-the-art in turbomachinery technology related to gas turbine engines. The journal covers a broad range of topics, including fluid dynamics, heat transfer, and aeromechanics technology associated with the design, analysis, modeling, testing, and performance of turbomachinery. Emphasis is placed on gas-path technologies related to axial compressors, centrifugal compressors, and turbines.\n\nTopics include: aerodynamic design, analysis, and testing of compressor and turbine blades; compressor stall, surge, and operability issues; heat transfer phenomena and film cooling design, analysis, and testing in turbines; aeromechanical instabilities; and computational fluid dynamics (CFD) applied to turbomachinery, boundary layer development, measurement techniques, and cavity and leaking flows.

《Journal of Turbomachinery》致力于发表高质量的、经过同行评审的技术论文，推动与燃气涡轮发动机相关的涡轮机械技术的最新进展。该期刊的主题范围广泛，包括与涡轮机械的设计、分析、建模、测试和性能相关的流体动力学、热传递和气动机械技术。特别强调与轴流压缩机、离心压缩机和涡轮相关的气流路径技术。\n\n研究主题包括：压缩机和涡轮叶片的气动设计、分析和测试；压缩机失速、涡旋和可操作性问题；涡轮中的热传递现象及膜冷却的设计、分析和测试；气动机械不稳定性；应用于涡轮机械的计算流体动力学（CFD）、边界层发展、测量技术以及腔体和泄漏流动。

Category	Quartile
工程技术	3
工程技术, 工程机械	3

Compressible Direct Numerical Simulation of Low-Pressure Turbines—Part I: Methodology

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Journal Info

Category	Quartile
ENGINEERING, MECHANICAL	3