TITLE

Effects of surface roughness and nonparallelism on the measurement of the acoustic nonlinearity parameter in steam turbine blades

AUTHOR(S)
Na, Jeong K.; Yost, William T.; Cantrell, John H.; Kessel, Gregory L.
PUB. DATE
May 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p1417
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The effects of surface roughness and nonparallelism of steam turbine blades have been measured by constructing different specimens made of 410Cb stainless steel, a popular material used in turbine blade construction. The sample specimens contain angles typically encountered in turbine blade measurement. Surface roughness often found in turbines during service life is incorporated in the samples. At each level of surface roughness and at each angle, the nonlinearity parameter β of the specimens has been measured. The experimental results show that β decreases as the level of roughness increases, while it increases as the degree of nonparallelism increases. Calibration factors for both specimen angle and surface roughness are determined, and comparison with some model calculations is made. © 2000 American Institute of Physics.
ACCESSION #
6029240

 

Related Articles

  • Editorial.  // Wind Engineering;2012, Vol. 36 Issue 4, piii 

    An introduction is presented in which the editor discusses various reports within the issue on topics including the wind turbine blade design, design and manufacturing process of axial flux permanent magnet generators, and wind turbine capital costs.

  • Creep-life prediction of service-exposed turbine blades. Marahleh, G.; Kheder, A. R. I.; Hamad, H. F. // Materials Science;Jul2007, Vol. 42 Issue 4, p476 

    We study the possibility of prediction of the service life of gas-turbine blades made of nickel alloys according to the results of accelerated testing of specimens cut out from these blades. The predictions are carried out with the help of two methods: by using the Larson-Miller parameter and...

  • Research on the localisation of the workpieces with large sculptured surfaces in NC machining. Sijie, Y.; Yunfei, Z.; Fangyu, P.; Xide, L. // International Journal of Advanced Manufacturing Technology;Mar2004, Vol. 23 Issue 5/6, p429 

    Localisation of workpieces with large sculptured surfaces can be difficult. Previously, such pieces were measured by the probe of the machine and adjusted manually. This process is arduous and time-consuming and an even allowance cannot be ensured for every measured point. Searching for the...

  • Relation Between Angle of Attack and Atmospheric Ice Accretion on Large Wind Turbine's Blade. Virk, Muhammad S.; Homola, Matthew C.; Nicklasson, Per J. // Wind Engineering;Dec2010, Vol. 34 Issue 6, p607 

    A numerical study of wind turbine blade profile's angle of attack variation on atmospheric ice accretion near the blade tip section was performed. Three dimensional computational fluid dynamics (CFD) based numerical analyses were carried out using NACA 64618 blade profile at five different...

  • Proposal of a Means for Reducing the Torque Variation on a Vertical-Axis Water Turbine by Increasing the Blade Number. Raciti Castelli, M.; De Betta, S.; Benini, E. // World Academy of Science, Engineering & Technology;2012, Issue 64, p206 

    This paper presents a means for reducing the torque variation during the revolution of a vertical-axis water turbine (VAWaterT) by increasing the blade number. For this purpose, twodimensional CFD analyses have been performed on a straight-bladed Darrieus-type rotor. After describing the...

  • Improvement of Efficiency Prediction for a Kaplan Turbine with Advanced Turbulence Models. Jošt, Dragica; Škerlavaj, Aljaž; Lipej, Andrej // Strojniski Vestnik / Journal of Mechanical Engineering;2014, Vol. 60 Issue 2, p124 

    A comparison between numerical simulations and measurements of a six-blade Kaplan turbine is presented in order to determine an appropriate numerical setup for accurate and reliable simulations of Kaplan turbines. Values of discharge, torque and losses obtained by different turbulence models are...

  • NOISE EFFECTS. Trias, Margaret; Codrington, John B. // Canadian Consulting Engineer;Mar/Apr2006, Vol. 47 Issue 2, p24 

    The article discusses the noise effects of wind turbines. Wind turbines produce a sound that comes from the flow of air over the blades and from the gearbox, generators, and the auxiliary equipment. However, improved designs of blade airfoils gearboxes and generators create lesser acoustic...

  • IMPACT ON BIRDS. Clarke, Trion M. // Canadian Consulting Engineer;Mar/Apr2006, Vol. 47 Issue 2, p24 

    The article discusses the impact of wind turbine generators to birds. The most common response of birds to turbines is that they recognize it as obstacles and they fly around it. Eventually, some birds collide with the turbines and die. Studies show that turbine models with lattice towers and...

  • Investigation of Gas Hold up and Power Consumption in a Stirred Tank Bioreactor Using Single and Dual Impeller Configurations. KARIMI, ALI; GOLBABAEI, FARIDEH; MEHRNIA, MOHAMMAD REZA; MOHAMMAD, KAZEM; NEGHAB, MASOUD; NIKPEY, AHMAD; POURMAND, MOHAMMAD REZA // International Journal of Occupational Hygiene;Jul2013, Vol. 5 Issue 3, p109 

    A laboratory stirred tank bioreactor with six single and dual-impeller configurations was tested to obtain the optimum operating conditions for future biological processes. Six impeller combinations consisting of three basic impeller types, namely Rushton turbine (RT), pitched 4blade (P4B) and...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics