Reliable engine-weight estimation at the conceptual design stage is critical to the development of new aircraft engines. It helps to identify the best engine concept amongst several candidates. In this paper, the major enhancements to NASA’s engine-weight estimate computer code (WATE) are described. These enhancements include the incorporation of improved weight-calculation routines for the compressor and turbine disks using the finite difference technique. Furthermore, the stress distribution for various disk geometries was also incorporated, for a life-prediction module to calculate disk life. A material database, consisting of the material data of most of the commonly used aerospace materials, has also been incorporated into WATE. Collectively, these enhancements provide a more realistic and systematic way to calculate the engine weight. They also provide additional insight into the design tradeoff between engine life and engine weight. To demonstrate the new capabilities, the enhanced WATE code is used to perform an engine weight/life tradeoff assessment on a production aircraft engine.

Issue Section:
Gas Turbines: Aircraft Engine
Keywords:
gas turbines, finite difference methods, aerospace engines, compressors, durability, aerospace materials, mass, aerospace computing
Topics:
Design, Disks, Weight (Mass)
1.
Onat, E., and Klees, G. W., 1979, “A Method to Estimate Weight and Dimensions of Large and Small Gas Turbine Engines,” NASA CR-159481.
2.
Ugural, A. C., and Fenster, S. K., 1987, Advanced Strength and Applied Elasticity, Second Ed., Elsevier, New York.
3.
Holman, J. P., 1990, Heat Transfer, Seventh Ed., McGraw-Hill, New York.
4.
Manson
,
S. S.
,
1965
, “
Fatigue: A Complex Subject—Some Simple Approximations, Experimental Mechanics
,”
Exp. Mech.
,
5
(
7
), pp.
193
–
226
.
5.
Newell, J. F., 1994, “A Note of Appreciation for the MUS,” Material Durability/Life Prediction Modeling: Materials for the 21st Century, PVP-290, ASME, New York, pp. 57–58.
6.
Gibson, C., ed., 1998, Aerospace Structural Metals Handbook, Vol.s 4 and 5, CINDAS/USAF/CRDA Handbooks Operation, Purdue University, West Lafayette, IN.
7.
Boyer, R., et al., 1994, Materials Properties Handbook—Titanium Alloys, ASM International, Materials Park, OH, Sections III and IV.
8.
ASM Handbook Committee, 1990, Metals Handbook, 10th Ed., Vols. 1 and 2, ASM International, Materials Park, OH.
9.
Huron, E. S., and Roth, P. G., 1996, “The Influence of Inclusions of Low Cycle Fatigue Life in a P/M Nickel-Base Disk Superalloy,” Superalloys 1996, R. D. Kissinger et al., eds., TMS, Warrendale, PA, pp. 359–368.
10.
Gunston, B., ed., 2000, “General Electric GE90,” Jane’s Aero-Engines, Jane’s Information Group Ltd., Surrey, UK, Issue 8, p. 430.
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