Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
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Windmilling Characteristics of Centrifugal-Flow Turbojets

  • Yoo, Il-Su (School of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Guseong-Dong) ;
  • Song, Seung Jin (School of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Lim, Jin Shik (Agency for Defense Development)
  • Published : 2004.11.01
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Abstract

A new nondimensional method for predicting the windmilling performance of centrifugal -flow turbojet engines in flight has been developed. The method incorporates loss correlations to estimate the performance of major engine components. Given basic engine geometry, flight Mach number, and ambient conditions, this method predicts transient and steady-state windmilling performance. Thus, this method can be used during the preliminary design stage when detailed hardware geometry and component performance data are not yet available. A nondimensional time parameter is newly defined, and using this parameter, the transient performance of different types of turbojets (e.g. centrifugal vs. axial) is compared. In addition, the predictions' sensitivity to loss correlations, slip factors, and inlet ambient temperatures are analyzed.

Keywords

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