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Comparative Engine Performance Measurements

It has been well known that test techniques, test
facilities and test instrumentation for ground testing of
turbojet engines vary between countries and even within the
same country. The impact of these differences on the
reported measurements and performance has remained
speculation since no controlled test program has evolved to
address the issues. With an increase in the international
development of new turbojet engines and international engine
purchases, the need to define and resolve these testing
inconsistencies has increased.
The Propulsion and Energetics Panel (PEP) of AGARD
recognized this growing problem and sponsored an ambitious
program to resolve it. Working Group 15, entitled the
Uniform Engine Testing Program, was formed over ten years
ago to organize and direct an international turboject engine
testing program and to analyze the test results. Tests were
conducted in five countries (eight test facilities) in both
altitude simulation facilities and ground test beds. A
program which was initially expected to be lengthy by AGARD
Working Group standards, grew even longer as the various
test centers were caused to delay testing as a result of
pressing national needs. The tenacity of Working Group 15
members and the continued support of the PEP membership and
AGARD National Delegates permitted the program to reach a
successful conclusion.
It is the purpose of this Lecture Series to present the
results of this lengthy and unprecedented investigation to
the aerospace community. Two documents have been published
by Working Group 15, i.e., AGARD-AR-248 (The Uniform Engine
Test Programme) and AGARDograph 307 (Measurement
Uncertainty). These two documents contain the basic content
of this Lecture Series. However, there were many additional
investigations and much rationale that was not published.
These Lecture Series notes contain selected portions of that
additional information and are intended as a supplement to
the documents already published.