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Presented By
Olivier Broca, SISW
Rocket engine digital twin
David Jimenez-Mena, SISW
Sylvain Pluchart, SISW
Stephane Mouvand, SISW
Thermal & Fluids Analysis Workshop
TFAWS 2019
August 26-30, 2019
NASA Langley Research Center
Hampton, VA
TFAWS Interdisciplinary Paper Session
Restricted
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Agenda
• Introduction
• RL-10 engine model
• Integrated framework for mission analysis
• Impact of cooling jacket temperature on engine start-up
• Conclusions and prospects
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Introduction
• Motivations for a computational transient model
VINCI cryogenic upper stage example
Comparison of milestones of engine tests for both Vinci and Vulcain engines
Source: Stéphane Durteste, “A Transient Model of the VINCI Cryogenic Upper Stage Rocket Engine”,
43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit 8 - 11 July 2007, Cincinnati, OH
TFAWS 2019 – August 26-30, 2019
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Agenda
• Introduction
• RL-10 engine model
• Integrated framework for mission analysis
• Impact of cooling jacket temperature on engine start-up
• Conclusions and prospects
TFAWS 2019 – August 26-30, 2019 4
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Modeling principles
• Bond graph representation
One of the first example given by Prof. Henry PAYNTER
The instantaneous power transfer between the
two systems S1 and S2 is 𝑷(𝒕)=𝒆(𝒕)∙𝒇(𝒕)
TFAWS 2019 – August 26-30, 2019
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Modeling principles
TFAWS 2019 – August 26-30, 2019 6
simple mechanical system represented
with the bond graph formalism
lumped vs. distributed parameter approach
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RL-10 engine
TFAWS 2019 – August 26-30, 2019
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RL-10 engine
• Combustion
Fractions function of chamber pressure and
mixture ratio
TFAWS 2019 – August 26-30, 2019
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RL-10 engine
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• Nozzle
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RL-10 engine
Example of thermal discretization - Same methodology
applied along the nozzle axis
TFAWS 2019 – August 26-30, 2019
• Regenerative cooling jacket
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RL-10 engine
• Valves and control
Ramp controlled pressure
TFAWS 2019 – August 26-30, 2019
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RL-10 engine
Engine performance simulated compared to firing test conditions
TFAWS 2019 – August 26-30, 2019
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Agenda
• Introduction
• RL-10 engine model
• Integrated framework for mission analysis
• Impact of cooling jacket temperature on engine start-up
• Conclusions and prospects
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Simulation framework
• Integrated simulation for mission analysis
RL-10 Engine model
• Thrust generated
• Cooling jacket thermal
performance
Environmental conditions
• Orbital heating
• Exosphere model
Spacecraft Flight
Dynamics
• Trajectory simulation
Spacecraft attitude
and position
Propulsion and
payload
Heat load on the
cooling jacket
TFAWS 2019 – August 26-30, 2019
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Simulation framework
• Realization in Simcenter Amesim
TFAWS 2019 – August 26-30, 2019
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Flight dynamics and mission definition
Overview of the flight dynamic super-component
TFAWS 2019 – August 26-30, 2019
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Orbit thermal environment
Orbital heat sources
considered in the study
6 element radiation
enclosure
and the view factorsResulting heat load on
nozzle (spin = 1.5 deg/s)
TFAWS 2019 – August 26-30, 2019
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Agenda
• Introduction
• RL-10 engine model
• Integrated framework for mission analysis
• Impact of cooling jacket temperature on engine start-up
• Conclusions and prospects
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Application case
Delta IV Medium Sequence of Events
for a GTO Mission (Eastern Range)
Source: Delta IV Launch Services
User’s Guide June 2013
Ground trace and solar exposition
on 3D earth
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Engine performance
Engine performance in real flight conditions and ground firing test conditions
TFAWS 2019 – August 26-30, 2019
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Spacecraft trajectory
Altitude profile, velocity profile and ground trace on 2D earth
TFAWS 2019 – August 26-30, 2019
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Agenda
• Introduction
• RL-10 engine model
• Integrated framework for mission analysis
• Impact of cooling jacket temperature on engine start-up
• Conclusions and prospects
TFAWS 2019 – August 26-30, 2019 22
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Conclusions and prospects
• Benefits of transient simulation model
– Support design and test activities (control design among others)
– Connect simulation models from different disciplines
– Ability to simulate complex sequences like a ballistic flight
segment followed by an engine re-ignition
– Refine, enrich and support test campaign specifications
• Prospects
– Upper stage flight dynamics simulation in support of GNC
development: fuel system, separation mechanisms, thrust
vectoring control, engine start-up and shut-down
– Stage recovery simulation: 6-DoF flight dynamics, aerodynamics,
fuel system, landing gear
TFAWS 2019 – August 26-30, 2019