A theoretical analysis of the performance of a diesel engine-compressor-turbine combination for aircraft Page: 2 of 25
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NACA ACR No. E103 1176 01403 2974
NACA ACE No. E5D10
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
ADVANCE CONFIDENTIAL REPORT
A TEORETICAL ANALYSIS OF THE PERFORMANCE OF A DIESEL
ENGINE-COMPRESSOR-TURBIIE COMBINATION FOR AIRCRAFT
By Eldon W. Hall
A theoretical study was made of a Diesel engine-compressor-
turbine combination for aircraft application. The performance char-
acteristics of the compressor and the turbine chosen for the analysis
are believed to be attainable on present aircraft equipment. Maximum
cylinder pressure, maximurn exhaust-gas temperature, and maximum
engine speed were limited to values now obtained on spark-ignition
engines. The analysis indicates favorable performance characteristics
for the proposed power plant for the following combinations of oondi-
(a) Extremely high engine inlet-manifold and exhaust-manifold
(b) Very lean fuel-air ratio
(c) Low engine compression ratio compared with conventional
Diesel engines to reduce the maximum cylinder pressure
to a safe value
(d) Intercooling between the compressor and the engine
(e) Use of turbine power in excess of that required to drive
The results indicate that it would be possible to obtain much
more power per unit displacement volume with this combination than
with a spark-Lgnition engine of the same maximum cylinder pressure
and engine exhaust-gas temperature. When the proposed combination
was assumed to operate under these conditions, the computed specific
fuel consumption at maximum power was lower than that now obtainable
with spark-ignition engines operating under a lean-cruise condition.
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Hall, Eldon W. A theoretical analysis of the performance of a diesel engine-compressor-turbine combination for aircraft, report, April 1, 1945; (digital.library.unt.edu/ark:/67531/metadc62106/m1/2/: accessed February 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.