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Foundation ::
Aerodynamics Applications ::
SRGULL
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SRGULL
An Advanced Engineering Model for the Prediction of Airframe Integrated Scramjet Cycle Performance
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Moderators:
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SOURCE CODE AVAILABLE
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The development of a single-stage-to-orbit aerospace vehicle intended
to be launched horizontally into low Earth orbit, such as the National AeroSpace
Plane (NASP), has concentrated on the use of the supersonic combustion
ramjet (scramjet) propulsion cycle. SRGULL, a scramjet cycle analysis
code, is an engineer's tool capable of nose-to-tail, hydrogen-fueled,
airframe-integrated scramjet simulation in a real gas flow with equilibrium
thermodynamic properties.
This program facilitates initial estimates
of scramjet cycle performance by linking a two-dimensional forebody, inlet
and nozzle code with a one-dimensional combustor code.
Five computer codes (SCRAM, SEAGUL, INLET, Progam HUD, and GASH) originally
developed at NASA Langley Research Center in support of hypersonic
technology are integrated in this program to analyze changing flow conditions.
The one-dimensional combustor code is based on the combustor subroutine
from SCRAM and the two-dimensional coding is based on an inviscid
Euler program (SEAGUL). Kinetic energy efficiency input for sidewall area
variation modeling can be calculated by the INLET program code. At the completion
of inviscid component analysis, Program HUD, an integral boundary
layer code based on the Spaulding-Chi method, is applied to determine
the friction coefficient which is then used in a modified Reynolds Analogy
to calculate heat transfer. Real gas flow properties such as flow composition,
enthalpy, entropy, and density are calculated by the subroutine
GASH. Combustor input conditions are taken from one-dimensionalizing the
two-dimensional inlet exit flow.
The SEAGUL portions of this program are
limited to supersonic flows, but the combustor (SCRAM) section can handle
supersonic and dual-mode operation. SRGULL has been compared to scramjet
engine tests with excellent results.
SRGULL carries the NASA case number LEW-15093. It was originally released as part of the NASA COSMIC collection.
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