From 7966b2d95d00b660c5f01a460a58d27da44208a4 Mon Sep 17 00:00:00 2001
From: tobi <tobias.weckenmann@tum.de>
Date: Tue, 3 Dec 2024 13:46:23 +0100
Subject: [PATCH] Adjusts the scaling factor calculation - scaling of rubber
engines - to use deck values instead of the engine xml
---
.../src/engine_design/rubber/turbofan.cpp | 18 ++++++++++++++----
1 file changed, 14 insertions(+), 4 deletions(-)
diff --git a/propulsion_design/src/engine_design/rubber/turbofan.cpp b/propulsion_design/src/engine_design/rubber/turbofan.cpp
index 25aaa82b..d09ccdfa 100644
--- a/propulsion_design/src/engine_design/rubber/turbofan.cpp
+++ b/propulsion_design/src/engine_design/rubber/turbofan.cpp
@@ -55,12 +55,22 @@ namespace design
{this->engine_directory(), this->engine_database()});
/* Scale the engine */
- /** @todo How and which thrust do we need here? */
+
+ /* Load the unscaled engine */
+ auto engine_unscaled = io::load_engine_scaled(
+ engine.model(),
+ 1,
+ {this->engine_directory(),
+ this->engine_database()});
+
+ /* Get the unscaled SLST value from the deck values as the highest N1 at SLS */
+ engine_unscaled.calculate_N1_with_penalties(0 , 0, this->flight_condition().ambiance, 1.0, "takeoff", 0, 0);
+
+ /* Scale the engine */
engine.set_scale(
- engine.required_thrust() > 0.0 ? engine.required_thrust() / engine_data.SLST() : 1.0);
+ engine.required_thrust() > 0.0 ? engine.required_thrust() / engine_unscaled.get_thrust() : 1.0); // engine_unscaled.get_thrust()
- /* Set and sale the parameters */
- /** @todo Where does the scaling of the length come from ?*/
+ /* Set and sale the parameters according to Ray12 p. 285 */
engine.set_dimension({engine_data.dimensions().height * std::pow(engine.scale(), 0.5),
engine_data.dimensions().width * std::pow(engine.scale(), 0.5),
engine_data.dimensions().length * std::pow(engine.scale(), 0.4)});
--
GitLab