Shape modification of an axial flow turbine nozzle to reduce erosion

Purpose – This paper aims to validate an axial turbine modified nozzle design, looking for a reduction of the nozzle erosion process during operation in power plants.Design/methodology/approach – The approach taken is numerical simulation using the computational fluid dynamics (CFD) tool, comparing original and proposed/modified nozzle designs.Findings – The paper provides information about how to achieve a solution of the turbine operational problem (abrasive wear) by an analysis of flow patterns under a variety of conditions.Research limitations/implications – It does not give a detailed interpretation of flow behaviour due to the lack of validation data.Practical implications – A very useful flow simulation methodology that can be used in industry is provided.Originality/value – The proposed design modification of an axial turbine nozzle with the aid of CFD simulation has not been performed yet. This paper investigates the possibility of nozzle erosion reduction by modifying local flow patterns.

[1]  A. Hamed,et al.  Effect of Environmental Particles on a Radial Compressor , 1989 .

[2]  Danian Chen,et al.  Computational mean particle erosion model , 1998 .

[3]  S. Roberts,et al.  The effect of impact angle on the erosion rate of polycrystalline α-Al2O3 , 1998 .

[4]  Vijay K. Jain,et al.  Modeling of material removal and surface roughness in abrasive flow machining process , 1999 .

[5]  P. De Palma,et al.  Numerical simulations of three‐dimensional transitional compressible flows in turbomachinery cascades , 2006 .

[6]  A. Gosman,et al.  Aspects of Computer Simulation of Liquid-Fueled Combustors , 1983 .

[7]  G. Faeth.  Mixing, transport and combustion in sprays , 1987 .

[8]  I. Finnie.  Erosion of surfaces by solid particles , 1960 .

[9]  Jan K. Spelt,et al.  Simulation of interference effects in particle streams following impact with a flat surface. Part II. Parametric study and implications for erosion testing and blast cleaning , 2003 .

[10]  The two‐fluid modelling of gas‐particle transport phenomenon in confined systems considering inter particle collision effects , 2004 .

[11]  Cheng-Xian Lin,et al.  Numerical investigations of liquid-solid slurry flows in a fully developed turbulent flow region , 2003 .

[12]  Tai-chiu Lee,et al.  Mechanism of the ultrasonic machining of ceramic composites , 1997 .

[13]  Jan K. Spelt,et al.  Simulation of interference effects in particle streams following impact with a flat surface: Part I. Theory and analysis , 2003 .

[14]  Reiner Mack,et al.  Numerical prediction of erosion on guide vanes and in labyrinth seals in hydraulic turbines , 1999 .

[15]  J. Dukowicz.  A particle-fluid numerical model for liquid sprays , 1980 .

[16]  C. A. van Luttervelt,et al.  Analytical and experimental modelling of the abrasive water jet cutting of ductile materials , 1998 .

[17]  Dimitri Gidaspow,et al.  Validation of computed solids hydrodynamics and pressure oscillations in a bubbling atmospheric fluidized bed , 1993 .

[18]  Neelesh Kumar Jain,et al.  Modeling of material removal in mechanical type advanced machining processes: a state-of-art review , 2001 .

[19]  Martin Sommerfeld,et al.  Analysis of collision effects for turbulent gas–particle flow in a horizontal channel: Part I. Particle transport , 2003 .

[20]  Z. Y. Wang,et al.  Dynamic Analysis of the Ultrasonic Machining Process , 1995 .

[21]  Bert Johansson,et al.  Application of wedge-shaped hot-film probes in a gas-particle flow , 2003 .

[22]  G. Quercia,et al.  Friction and wear behavior of several hard materials , 2001 .

[23]  Rached Ben-Mansour,et al.  Erosion in the tube entrance region of a shell and tube heat exchanger , 2005 .

[24]  P. Ferreira,et al.  Modeling of ductile-mode material removal in rotary ultrasonic machining , 1998 .

[25]  B. T. Chao,et al.  A novel radioactive particle tracking facility for measurement of solids motion in gas fluidized beds , 1985 .

[26]  Neelesh A. Patankar,et al.  Lift Correlations from Direct Numerical Simulation of Solid-Liquid Flow , 2000 .

[27]  Donghuo Zhou,et al.  Turbulent intensities in open-channel flows , 2001 .

[28]  G. Choi,et al.  Process analysis and monitoring in abrasive water jet machining of alumina ceramics , 1997 .

[29]  James W. Baughn,et al.  The effect of turbulence intensity and length scale on low-pressure turbine blade aerodynamics , 2001 .

[30]  Yutaka Tsuji,et al.  Activities in discrete particle simulation in Japan , 2000 .

[31]  Robert W. Lyczkowski,et al.  State-of-the-art review of erosion modeling in fluid/solids systems , 2002 .

[32]  Stephen Y. Bergeron,et al.  Implementation strategies for real-time particle transport solver , 1999 .

[33]  A. Kassab,et al.  BEM/FVM conjugate heat transfer analysis of a three‐dimensional film cooled turbine blade , 2003 .