High Altitude Performance of High Bypass Ratio Engines - an Airframe Manufacturer's Point of View 690652
The traditional method of determining the net thrust of an engine in cruise is explained. It is shown to result in a satisfactory net thrust uncertainty for jet and low bypass ratio engines but to be unsuitable for high bypass ratio engines. A redefinition of net thrust results in a new thrust determination method, called continuity method, which yields acceptable levels of net thrust uncertainty. The new method no longer requires supporting tests in a simulated altitude facility. The question is raised whether in future programs the demonstration of guaranteed cruise performance of an engine should not be carried out in flight tests rather than in an altitude test facility.
Citation: Bouwer, D. and Schott, G., "High Altitude Performance of High Bypass Ratio Engines - an Airframe Manufacturer's Point of View," SAE Technical Paper 690652, 1969, https://doi.org/10.4271/690652. Download Citation
Author(s):
D. W. Bouwer, G. J. Schott
Affiliated:
The Boeing Co.
Pages: 9
Event:
Aeronautic and Space Engineering and Manufacturing Meeting
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
SAE 1969 Transactions-V78-A
Related Topics:
Flight tests
Thrust
Test facilities
Suppliers
Airframes
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