0

Full Content is available to subscribers

Subscribe/Learn More  >

Development of Direct-Driven and Geared Fan Stages With Reduced Tip Speeds

[+] Author Affiliations
S. V. Pankov, V. I. Mileshin, I. K. Orekhov, V. A. Fateev

Central Institute of Aviation Motors, Moscow, Russia

Paper No. GT2017-64585, pp. V02AT39A036; 11 pages
doi:10.1115/GT2017-64585
From:
  • ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
  • Volume 2A: Turbomachinery
  • Charlotte, North Carolina, USA, June 26–30, 2017
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5078-7
  • Copyright © 2017 by ASME

abstract

This work presents the latest results of aeromechanical design of two large-scale fan model stages (Dr = 700 mm) for low-noise high-performance single-stage fan prototypes designed for advanced civil aircraft geared and direct-driven turbofans with reduced and ultra-low rotor tip speeds, high specific capacity, and high bypass ratios. They are designed with account of all features of blades made of polymer composite materials (PCM) or titanium alloy. Metal and composite blades have a similar shape in hot state at the design point. The stages are intended for tests in the anechoic chamber of the CIAM’s C-3A special acoustic test facility with the aim of verification new optimal design methods for similar fans to achieve maximum performance.

Performances of the fans and parameters of viscous steady flows are calculated. The calculations show that both fan models can provide a high specific capacity along with a high efficiency and sufficient stall margins. For example, calculated max. efficiency level of the bypass duct in the geared model fan with ultra-low tip speed (Ucor. = 313.4 m/s) is equal to 94%.

Data measured by tests of an ungeared bypass fan model with solid metal rotor blades developed earlier by the authors are used for the mathematical model verification. Tip speed of rotor blades at the design point is Ucor. = 400m/s, bypass ratio — m = 8.4. Four booster stages are installed in the core duct. From first test results it is clear that required values of key parameters are achieved. Comparison of measured and calculated data gives evidence of their good agreement. At present, detailed tests of this fan and a similar fan with 3 booster stages are under way in the anechoic chamber of the CIAM’s C-3A acoustic test facility.

The new direct-driven fan model described in this paper has quite different design values of parameters, geometry of the meridian contours, and shapes of outer and inner ducts. Tip speed of its rotor blades is reduced by 30 m/s, the hub diameter is decreased, and bypass ratio is higher (m = 11).

In the near future, these two new models of non-geared and geared fans can be manufactured and tested.

Copyright © 2017 by ASME

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In