| dc.description |
This report describes GENENG, a code developed t o model the performance of a generic turboprop engine. Using published data from various
sources, a database of 7 turboprop engines suitable for General Aviation, Commuter & Regional transport aircraft was developed. This database consists of the values of the SHP available, Fuelflow, and Jet Thrust produced by the engines at
specific altitudes between sea-level and 35000 ft and
forward speeds between 0 and 350 knots (TAS), at
max. take-off, max. Climb & max. Cruise ratings. GENENG can then be used to obtain realistic estimates of any of these three parameters for a
generic engine that lies within this database at any
operating condition, i.e. altitude, forward speed,
and engine rating. The user has to specify the
ball-parking criterion, i.e. the desired value of any
one of the three parameters at a specific operating
condition. The generic engine is then positioned
in the database, by identifying the nearest two engines at the ball-parking criterion. The fractional
ratio of the location of the generic engine from
these two engines is then calculated. Assuming
that the same fractional ratio would also apply at
all the other data points, the values of all the parameters at all engine ratings are then generated
at specific combinations of forward speed and altitude. Using Bicubic Spline interpolation routines, the value of any of the three parameters at any
forward velocity and altitude can then be obtained. |
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