numengo|fl - cryogenic space systems - simulink

© numenGo | www.numengo.com 1/20

Cryogenic space systems simulation with numenGo|FL

http://www.numengo.com/


Cryogenic space propulsion specifics

● Launcher engines● Medias

● Liquids● Gas● 2-phase● Solids● pure/mixture

● mass/heat transfer● compressible● 2-phase



Cryogenic space propulsion specifics

● Cryogenic storage● Stratified storage● Micro-gravity ?

● Off-gassing● Boiling● Thermal coupling



numenGo

● Thermal Fluids modeling and simulation specialists● Our Vision

● Capitalize modeling know-how in evolutive, generic, platform independant libraries

numenGo | FFCnumenGo|FL

numenGo | MPS

SIMULATION PLATFORMC

r yo ge n ic s

Pr op ul si on

etc ..

Business Oriented Library

APPLICATIVESOLUTIONS

THEIR expertise

OUR expertise

YOUR expertise



numenGo

● Thermal Fluids modeling and simulation specialists● Our Vision

● Capitalize modeling know-how in evolutive, generic, platform independant libraries


numenGo | MPS

SIMULATION PLATFORMC

r yo ge n ic s

Pr op ul si on

Rocket Engine Add-on

APPLICATIVESOLUTIONS



Software Components

● numenGo|FLContains high level components


numenGo | MPS

SIMULATION PLATFORM

Rocket Engine Add-on



Software Components

● numenGo|FLpolymorphic components

Thermodynamic sources

flow sources

Heat exchanges



Software Components

● numenGo|FLpolymorphic components

● Pipes● Distributed models

● Dynamic discretization

● Flexible geometry● Optional Inertial effects● Convective heat exchange



numenGo|FL

● numenGo|MPS

● A Media Property Server to compute fluid or solids thermodynamic properties, optimized for system simulation

● Object Oriented, compliant to the CAPE-OPEN specification for

physical properties server

● Compute thermodynamic properties for all state of matter:● Liquid, gas, two-phase or solid● Pure compound or mixture

● From simple description (ie perfect gas) to most precise state of the art descriptions (ie fundamental equation of state of Helmholtz, ECS, etc...



numenGo|FL

● numenGo|FFCFFC is strongly integrated with MPS, and provides all base objects to solve mass and heat transfer

● Mass transfer models● Flow equations

● incompressible, real fluid compressible, perfect gas compressible

● Flow resistance models● Friction factor models (Colebrook, Churchill,...)● Flow resistance models (2-K method, Cq, Crane...)● Two-phase flow

● Two-phase correlations (Friedel, Bankoff...)● Slip ratios (homogeneous, Chisholm, Zivi...)● Bulk properties (Dukler, Cicchitti, McAdams...)

● Flow component models (tee junction, pumps, turbines, ejectors...)



numenGo|FL

● numenGo|FFCFFC is strongly integrated with MPS, and provides all base objects to solve mass and heat transfer

● Heat transfer models● Conduction● Forced and free convection

● Two-phase forced convection● Boiling (Chen, VDI...)● Condensation (Shah, Cavallini & Zecchin...)

● Radiation



numenGo|FL

● Focus on an important FFC feature : compressible flows● Cryogenic systems often deal with fluids with real fluid behaviour

● Supercritical, 2-phase or close to saturation

● Flows canno't be properly predicted with incompressible assumptions, or with perfect gas compressible assumptions

● Cryogenic systems often use calibrating orifices● => chocked flows !!

In-house algorithm to compute compressible flows and predict chocked flows in real fluid domain

Validation against NASA experiments with subcooled N2● Nasa Technical Memorandum TM X-71516

Two-phase chocked flow of subcooled nitrogen through a slit, NASA, 1974



Compressible flows

● NASA experiments vs numenGo's algorithm



Applications

● Launcher cryogenic storage● Aim: predict behaviour over different mission profiles



Applications

● Launcher cryogenic storage



Applications

● Satellite combined self-pressurized storage



Applications




Possible studies

● Architecture evaluation and cycle performance

● Start-up and shut-down sequence control strategies

● Break-down configuration analysis

● Stability analysis

● Storage management



Conclusion

● NumenGo's offer

● State of the art solutions, scalable model database● Best-in-class physical content

● Unique modelling paradigm● design new specific models for dedicated business applications

● Highly polymorphic● From simple to very complex thermofluid systems● Usable by engineers or experts

● Available on most used system simulation environment


numengo|fl - cryogenic space systems - simulink

Technology

phase numengo

radiation numengo

flow component models

numengofl numengoffcffc

simulation specialists

real fluid compressible

modeling knowhow

numengofl focus