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RISScaling Three Dimensional Low Pressure Turbine Blades for Low Speed Testing
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The present activity was carried out in the framework of the Clean Sky European Research Project ITURB (optimal highlift turbine blade aeromechanical design), aimed at designing and validating a turbine blade for a geared ...
Accounting for Unsteady Interaction in Transonic Stages
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper discusses the importance of the unsteady interaction in transonic turbomachinery stages. Although the flow in a turbomachine is inherently unsteady, most current calculations for routine design work exploit the ...
Improving Steady Computational Fluid Dynamics to Capture the Effects of Radial Mixing in Axial Compressors
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The compressors of power-generation gas turbines (GTs) have a high stage count, blades with low aspect ratios, and large clearances. These features promote strong secondary flows. An important outcome deriving from the ...
Analysis of the Loss Production Mechanism Due to Cavity–Main Flow Interaction in a Low-Pressure Turbine Stage
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In the present work, URANS simulations are presented to describe the unsteady interaction process between the flow ingested/ejected from a cavity system and the main flow evolving into a low-pressure turbine stage. Particular ...
The Influence of Roughness on a High Pressure Steam Turbine Stage: An Experimental and Numerical Study
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This work deals with the influence of roughness on highpressure steam turbine stages. It is divided in three parts. In the first one, an experimental campaign on a linear cascade is described, in which blade losses are ...
Special Challenges in the Computational Fluid Dynamics Modeling of Transonic Turbo Expanders
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: High pressure ratio turboexpanders often put a strain on computational fluid dynamics (CFD) modeling. First of all, the working fluid is usually characterized by significant departures from the ideal behavior, thus requiring ...
Numerical and Experimental Investigation of Axial Gap Variation in High-Pressure Steam Turbine Stages
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This work aims at investigating the impact of axial gap variation on aerodynamic performance of a high-pressure steam turbine stage. Numerical and experimental campaigns were conducted on a 1.5-stage of a reaction steam ...
Secondary Flows in Low-Pressure Turbines Cascades: Numerical and Experimental Investigation of the Impact of the Inner Part of the Boundary Layer
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Due to the low level of profile losses reached in low-pressure turbines (LPT) for turbofan applications, a renewed interest is devoted to other sources of loss, e.g., secondary losses. At the same time, the adoption of ...
Capturing Radial Mixing in Axial Compressors With Computational Fluid Dynamics
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The current industrial standard for numerical simulations of axial compressors is the steady Reynolds-averaged Navier–Stokes (RANS) approach. Besides the well-known limitations of mixing planes, namely their inherent ...