Abrasive wear in the clearance gap of guide vanes (GVs) increases the gap size, which deteriorates the flow and causes loss of efficiency. This paper investigates the performance of a Francis turbi...

https://www.tandfonline.com/doi/pdf/10.1080/19942060.2018.1509806

Numerical investigation of the effect of leakage flow through erosion-induced clearance gaps of guide vanes on the performance of Francis turbines

https://hal.archives-ouvertes.fr/hal-01574153/document

Effect of tip clearance and rotor–stator axial gap on the efficiency of a multistage compressor

Study on the initiation characteristics of the oblique detonation wave by a co-flow hot jet

Additive manufacturing (AM) has proven to be the preferred process over traditional processes in a wide range of industries. This review article focused on the progressive development of aero-turbine blades from conventional manufacturing processes to the additive manufacturing process. AM is known as a 3D printing process involving rapid prototyping and a layer-by-layer construction process that can develop a turbine blade with a wide variety of options to modify the turbine blade design and reduce the cost and weight compared to the conventional production mode. This article describes various AM techniques suitable for manufacturing high-temperature turbine blades such as selective laser melting, selective laser sintering, electron beam melting, laser engineering net shaping, and electron beam free form fabrication. The associated parameters of AM such as particle size and shape, powder bed density, residual stresses, porosity, and roughness are discussed here.

/pdf/a-review-on-the-processing-of-aero-turbine-blade-using-3d-gc8i090n.pdf

A Review on the Processing of Aero-Turbine Blade Using 3D Print Techniques

An experimental method for squealer tip flow field considering relative casing motion

Investigation of hot jet on active control of oblique detonation waves

Tip-leakage flow loss reduction in a two-stage turbine using axisymmetric-casing contouring

In turbomachinery the tip leakage vortex is an obvious periodic phenomenon associated with rotor blade, its interaction with stator wake will affect the tonal noise level and aerodynamic performance. This study assesses the effects of tip leakage vortex on the stator/rotor interaction tonal noise and its unsteady behavior by 3D unsteady numerical simulations and the Triple-Plane Pressure matching strategy. The fluctuation of blade loading distribution and the interaction of wake negative jet with tip clearance flow change the structure and position of tip leakage vortex and scrapping vortex periodically. From the time-average results, the incoming wakes reduced the strength of vortices. The result also shows that the tonal noise level of turbine stage is decreased with the enlargement of tip clearance.Copyright © 2012 by ASME

Lei Zhao

Papers

Investigation of hot jet on active control of oblique detonation waves

Tip-leakage flow loss reduction in a two-stage turbine using axisymmetric-casing contouring

Tip Clearance Effects on Unsteady Behavior of the Tip Leakage Vortex and Stator/Rotor Interaction Tonal Noise