innovative xenon/krypton fms - icubesat · innovative xenon/krypton fms (feed management system)...

ADVANCED BUSINESS& TECHNOLOGIES

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THIS DOCUMENT IS public

29/05/2019

Pascal BARBIER – Program Manager • Air Liquide Advanced Technologies

Innovative Xenon/Krypton FMS (Feed Management System) for Electric Propulsion

AIR LIQUIDE, LE LEADER MONDIAL DES GAZ, TECHNOLOGIES ET SERVICES POUR L’INDUSTRIE ET LA SANTÉ



This document and the information contained herein is l’Air Liquide S.A. or one of its affiliates’ property. The document isconfidential business information and may furthermore contain confidential technical information. It is provided to certainemployees of the Air Liquide Group for their internal use exclusively in the course of their employment. Any reproductionor disclosure of all or part of this document to third parties is prohibited without the express written consent of anauthorized representative within the Air Liquide Group. If you have received this document by mistake, please immediatelynotify the sender and destroy the original message.


ICubeSat Conference • 29/05/2019

Speaker : Pascal [email protected] Space Business Unit

Simon CARPENTIER (ALAT)Yoann FENDLER (ALAT)Eric GUILBAUD (ALAT)

Gaelle Giesen (CNES)Claude BONIFACE (CNES)

mailto:[email protected]


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Summary

1 Functional description of the FMS

2 Description of the regulation valve (MFV) & performances

3 Presentation of the FMS design

4 FMS performances

5 Conclusions

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Functional description of the FMS


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Functional description

● FMS which can deliver a Xenon flow rate between 0,03 and 0,15mg/s composed of

– A high pressure MLI insulated xenon tank (140 bar MEOP) with heaters– Two thruster feeding lines (overshoot line and regulation line)– 2 safety barriers (HP solenoid valves)– 2 pressure sensors– 2 orifices– 2 MFV (Multi Function Valve)


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Functional description

● MFV (Multi Function valve) acts as pressure regulator and mass flow rate regulator

● Closed loop on the pressure sensor signal to drive the MFV (PID control)

● Orifices precisely dimensioned to reach the targeted flow rate


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Description of the regulation valve (MFV) & performances


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Technical description of MFV

● Main characteristics are :– Less than 2.5 cm length– Less than 10g– Thermal dilation of the valve body– Act as pressure regulator and flow rate regulator

Dilation for opening

Fluidic inlet

(High pressure)Fluidic outlet

(low pressure)

Winding for valve heatingWire for power

supply


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Leak tests

● Initial conditions– Helium– 180 bar upstream

● Results Leak rate lower than10-7mbar.L/s


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Closed loop flow rate regulation (1/2)

● Initial conditions– Upstream pressure from 3bar to

60bar– Tests performed with Xe– Three operating points

representative of a 5kW range thruster (8,5mg/s - 11mg/s -16mg/s)

● Results : Transient phase < 20s (opening and closing) No overshoot obtained Good stability of regulated flow rate


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Closed loop flow rate regulation (2/2)

● Initial conditions– Upstream pressure of 186 bar– Tests performed with Xe– Three operating points

representative of a 1kW range thruster (2,5mg/s – 3,5mg/s -5mg/s)

● Results : Transient phase < 20s (opening and closing) No overshoot obtained Good stability of regulated flow rate


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Endurance tests

● Initial conditions– 20,000 opening/closing cycles (no

gas)– Leak test and valve caracterization

each 3 000 cycles (with He)

● Results : No impact on tightness of the valve Behavior of the valve not affected by On/Off cycles


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Thermal environment robustness

● Initial conditions– Temperature of environment : from

30°C to 90°C– Closed loop configuration

● Results : No impact of thermal environment on regulated flow rate Closing transient < 20s even in hot environment Valve tightness ensured even at 90°C


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Presentation of the FMS design


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Design of the FMS

● FMS included in 1U● Mass flow rate : 0,01-0,2 mg/s

/ 0,5-10mg/s ● Mass : 500g (dry mass)● Tank of 200g of Xenon (140

bar MEOP)● Internal/external leakage < 10-

4mbar.L/s● Proof pressure and burst test

realized on the tank (ECSS standard)


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FMS performances


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FMS performances at high pressure● Initial conditions :

– 60 bars– Krypton– Non optimized PID values

● Results– Response time ~60s– Very stable regulation


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FMS performances at low pressure● Initial conditions :


● Results– Response time > 60S– Low stability– Regulation possible


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FMS performances at low flow rate● Initial conditions :


● Results– Response time > 60S– Good stability– Regulation possible


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Conclusions


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Conclusions

● The main strengths of this FMS are :– Low mass– Compatible with high pressure Xenon – Simplicity– Performances

– Stability of flow rate – Wide range of working

upstream pressure– Good results coupled with a

30W thruster– Reliability


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Conclusions

● Way forward– New design (XFS) on going to

improve MAIT phase– Same performances with a

single regulation line– New tank to be designed

– TRL 6 foreseen at end of 2019 (procurement on going)

innovative xenon/krypton fms - icubesat · innovative xenon/krypton fms (feed management system)...

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