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Keywords: losses
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Journal Articles
Article Type: Research Papers
J. Turbomach. August 2020, 142(8): 081006.
Paper No: TURBO-19-1132
Published Online: July 29, 2020
... aims to fill this gap of knowledge. The secondary flow structures in mixed flow turbines are particularly complex due to its geometry, high curvature, and the appearance of Coriolis and centrifugal forces. The focus of the present work is to investigate the evolution of secondary flows and their losses...
Journal Articles
Article Type: Research-Article
J. Turbomach. January 2014, 136(1): 011008.
Paper No: TURBO-12-1103
Published Online: September 20, 2013
... ) ). Thus, we conclude that the strength and downstream endurance of the antikidney vortex pair increases with I . The losses caused by film cooling are evaluated according to Eqs. (3)–(6) against the varied parameters M , I , and VR . For each loss coefficient, there are two cases...
Journal Articles
Article Type: Technical Papers
J. Turbomach. July 2007, 129(3): 563–571.
Published Online: August 12, 2006
... in the profile loss performance of the order of 20% could be obtained near the design Mach number at design incidence. Measurements performed at off-design incidence, but still at the design Mach number, showed that the superior performance of the aft-loaded blade extended over a range of incidence from about...
Journal Articles
Article Type: Technical Papers
J. Turbomach. July 2006, 128(3): 536–546.
Published Online: January 23, 2006
... with different surface roughness levels are employed in this study. Effects of surface roughness on the vane pressure side on the profile losses are relatively small compared to suction side roughness. Overall effects of turbulence on local wake deficits of total pressure, Mach number, and kinetic energy...
Journal Articles
Article Type: Technical Papers
J. Turbomach. April 2006, 128(2): 281–291.
Published Online: February 1, 2005
...M. W. Benner; S. A. Sjolander; S. H. Moustapha A new empirical prediction method for design and off-design secondary losses in turbines has been developed. The empirical prediction method is based on a new loss breakdown scheme, and as discussed in Part I, the secondary loss definition in this new...
Journal Articles
Article Type: Technical Papers
J. Turbomach. April 2004, 126(2): 277–287.
Published Online: June 15, 2004
... this experiment suggest that the strength of the passage vortex plays an important role in the downstream flow field and loss behavior. It was concluded that the aerofoil loading distribution has a significant influence on the strength of this vortex. In contrast, the leading-edge geometry appears to have only...
Journal Articles
Article Type: Technical Papers
J. Turbomach. October 2005, 127(4): 649–658.
Published Online: March 1, 2003
...Jochen Gier; Bertram Stubert; Bernard Brouillet; Laurent de Vito Endwall losses significantly contribute to the overall losses in modern turbomachinery, especially when aerodynamic airfoil load and pressure ratios are increased. In turbines with shrouded airfoils a large portion of these losses...
Journal Articles
Article Type: Technical Papers
J. Turbomach. January 2003, 125(1): 48–56.
Published Online: January 23, 2003
... aerodynamic loss and surface heat transfer. For the conditions of this study, the difference in stagnation pressure from the nozzle’s inlet to its exit were reduced by more than 40% with swirl or with fillet without swirl. Surface heat transfer was reduced by more than 10% on the airfoil and by more than 30...
Journal Articles
Article Type: Technical Papers
J. Turbomach. January 2003, 125(1): 173–182.
Published Online: January 23, 2003
... and radial gap between impeller exit and diffuser vane inlet. Attention is mainly directed to the radial gap, as it determines the intensity of the impeller-diffuser interaction. Part I deals with the integral flow losses and the diffusion in impeller, diffuser and the entire compressor. An extensive test...
Journal Articles
Article Type: Technical Papers
J. Turbomach. January 2003, 125(1): 14–24.
Published Online: January 23, 2003
... and tip sections and so reduce the secondary losses. The flow field is investigated in a low-speed research turbine using pneumatic and hot-wire probes downstream of the blade row. Steady and unsteady numerical simulations were performed using structured 3-D Navier-Stokes solver to further understand...
Journal Articles
Article Type: Technical Papers
J. Turbomach. October 2002, 124(4): 623–631.
Published Online: November 7, 2002
... to high platform heat transfer and large aerodynamic losses. The flow and thermal fields combine to give nonuniform total pressure profiles entering the turbine passage which, along with the airfoil geometry, dictate the secondary flow field. This paper presents an analysis of the effects of varying total...
Journal Articles
Article Type: Technical Papers
J. Turbomach. July 2002, 124(3): 453–460.
Published Online: July 10, 2002
... to improve the heat transfer and aerodynamic loss performance of turbine vane and rotor blade cooling systems. The physical principles embodied in the new hole design are described, and a typical example of the console geometry is presented. The cooling performance of a single row of consoles was compared...
Journal Articles
Article Type: Technical Papers
J. Turbomach. April 2002, 124(2): 214–221.
Published Online: April 9, 2002
...J. B. Young; R. C. Wilcock This paper is Part II of a study concerned with developing a formal framework for modeling air-cooled gas turbine cycles. It deals with the detailed specification of coolant flowrates and losses. For accurate performance assessment, it is necessary to divide the turbine...
Journal Articles
Article Type: Technical Papers
J. Turbomach. April 2002, 124(2): 207–213.
Published Online: April 9, 2002
... approach is to define just two components, air and gas, the latter being the products of stoichiometric combustion of the fuel with air. If these components can be represented as ideal gases, the entropy increase due to compositional mixing, although a true exergy loss, can be ignored for the purpose...
Journal Articles
Article Type: Technical Papers
J. Turbomach. January 2002, 124(1): 52–60.
Published Online: February 1, 2001
... an influence on the flow behavior in terms of loss generation, energy transport and secondary flow. The objective of the presented study is to investigate the effects of stator airfoil clocking on the performance of a 1-1/2 stage axial cold air turbine. The investigated axial turbine consists of two identical...
Journal Articles
Article Type: Technical Papers
J. Turbomach. July 2001, 123(3): 534–543.
Published Online: February 1, 2000
...Neil W. Harvey; Ken Ramsden The over tip leakage (OTL) flow that exists between the stationary casing and the rotor tip of a shroudless HP turbine remains a major source of loss of performance for modern aero gas turbines. To date the principal approaches to reducing OTL loss have been to minimize...
Journal Articles
Article Type: Technical Papers
J. Turbomach. April 2001, 123(2): 238–248.
Published Online: February 1, 2000
...Oguz Uzol; Cengiz Camci; Boris Glezer The internal fluid mechanics losses generated between the blade plenum chamber and a reference point located just downstream of the trailing edge are investigated for a turbine blade trailing edge cooling system. The discharge coefficient C d is presented...
Journal Articles
Article Type: Technical Papers
J. Turbomach. April 2001, 123(2): 314–323.
Published Online: February 1, 2000
... modified parameters. With each additional simulation, a detailed comparison of the leakage flow’s direction, pressure gradient, and mass flow, as well as the leakage vortex and its roll-up, size, losses, location, and interaction with other flow features, was conducted. Part I of this two-part paper...
Journal Articles
Article Type: Technical Papers
J. Turbomach. April 2001, 123(2): 324–333.
Published Online: February 1, 2000
... modified parameters. With each additional simulation, a detailed comparison of the leakage flow’s direction, pressure gradient, and mass flow, as well as the leakage vortex and its roll-up, size, losses, location, and interaction with other flow features, was conducted. Part II of this two-part paper...
Journal Articles
Article Type: Technical Papers
J. Turbomach. April 2001, 123(2): 207–213.
Published Online: February 1, 2000
...H. Sauer; R. Mu¨ller; K. Vogeler Experimental results are presented which show the influence on the secondary flow and its losses by a profile modification of the leading edge very close to the endwall. The investigation was carried out with a well-known turbine profile that originally...