Author: James F. Anderton (CAPT, USAF.)Publisher:
ISBN:
Category : Axial flow compressors
Languages : en
Pages :
Book Description
Stall Precursor Study of High Frequency Data for Three High Speed, Swept Compressor Rotors
Author: James F. Anderton (CAPT, USAF.)Publisher:
ISBN:
Category : Axial flow compressors
Languages : en
Pages :
Book Description
Stall Precursor Study of High Frequency Data for Three High Speed, Swept Compressor Rotors
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 165
Book Description
The frequency spectra of three single stage, high speed compressor rotors were derived and analyzed from experimental data. The compressor rotors included straight, backward-swept, and forward-swept blade designs. Data was acquired from four pressure transducers located on the compressor casing and arranged axially between locations 40% of blade chord upstream of the rotor face to just over the leading edge of the blades. Each rotor was throffled to stall at two constant speeds between 90% and 100% of design speed. Data digitization at 20 kHz revealed multiples of the rotor frequency up to and beyond a dominant blade passing frequency. Further analyses for characteristics of impending stall included examination of integrated signal power and cross-correlations of transducer signals from the upstream and downstream-most pressure transducers. Results of the integrated signal power approach showed promise as a potential pre-stall warning. This technique detected differences in the signal power at the two transducers in the irrunediate pre-stall time frame. Pre-stall warning times varied from several seconds to less than 0.5 second, with higher rotor speeds giving less warning time. Results for the forward-swept rotor, however, showed that integrated signal power did not warn of impending stall, and that surge energies played an important role in this rotor's stalling characteristics. An hypothesis for the behavior of the forward swept rotor, based on the possibility of stall development beginning in the near-hub radial region of this compressor, was developed.
Scientific and Technical Aerospace Reports
Author: Masters Theses in the Pure and Applied Sciences
Author: Wade H. ShaferPublisher: Springer Science & Business Media
ISBN: 1461303931
Category : Science
Languages : en
Pages : 427
Book Description
Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS)* at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dis semination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volumes were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 39 (thesis year 1994) a total of 13,953 thesis titles from 21 Canadian and 159 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this impor tant annual reference work. While Volume 39 reports theses submitted in 1994, on occasion, certain uni versities do report theses submitted in previous years but not reported at the time.
Sensing, Actuation, and Control in Aeropropulsion
Author: James Donald PaduanoPublisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 242
Book Description
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