Identification of a fluid for two phase fluid capillary pumped system cooling dedicated to aircraft applications
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1 Identification of a fluid for two phase fluid capillary pumped system cooling dedicated to aircraft applications Brussels / 19 th January 2012 /
2 /01/ HISPANO-SUIZA at a glance 1 / CONFIDENTIAL / / SP\E\ST
3 SAFRAN AT A GLANCE An international high technology group. Revenues of 10.8 billion euros. More than 54,000 employees in over 50 countries revenues by branch: Aircraft Equipment 26% 52% 12% Defence Aerospace Propulsion 10% Security 2 / CONFIDENTIAL / / SP\E\ST
4 HISPANO-SUIZA IN THE SAFRAN GROUP Aerospace Propulsion Snecma Snecma Propulsion Solide Turbomeca Microturbo Techspace Aero Aircraft Equipment Aircelle Hispano-Suiza Labinal Messier-Bugatti-Dowty Defence & Security Sagem Morpho (formerly Sagem Sécurité) 3 / CONFIDENTIAL / / SP\E\ST
5 HISPANO-SUIZA A major player in the airborne applications of electrical power Specialist in the transmission and management of onboard power Power transmissions for engines on commercial airplanes, business and regional aircraft, military aircraft and helicopters Electronic power controllers and electrical systems 4 / CONFIDENTIAL / / SP\E\ST
6 PROPULSION SYSTEM A380 / NACELLE: ETRAS (Electrical Thrust Reverser Actuation System) Power controller Power converter The first electrical thrust reverser actuation system in the world: Fitted to nacelles made by Aircelle (Safran group) for the GP7200 and Trent 900 engines offered on the A380; In production, ETRAS has logged over 700,000 hours of operation (as of September 2011). 5 / CONFIDENTIAL / / SP\E\ST
7 PROPULSION SYSTEM C919 / NACELLE: TRCU (Thrust Reverser Control Unit) TRCU: an innovative electronic power converter Controls the thrust reverser actuation system of the COMAC C919 Nacelle developed by Nexcelle (an Aircelle/GE Joint Venture) Based on experience with the ETRAS system for the A380. A work in synergy with fellow Safran companies for Aircelle: Aircelle: Architecture and equipment integration in the nacelle; Sagem (Safran Electronics): Reverser actuation system; Hispano-Suiza (Safran Power): TRCU (Thrust Reverser Control Unit). Catia view of the C919 Thrust Reverser Control Unit 6 / CONFIDENTIAL / / SP\E\ST
8 LANDING AND BRAKING SYSTEMS BOEING 787 / BRAKING: EBAC (Electrical Braking Actuation Controller) Messier-Bugatti-Dowty electric brake for the Boeing 787 The first electrical braking system in the world developed for civil application. Safran Power provides the EBAC electronic control unit: EBAC is used with Messier-Bugatti-Dowty electric brakes for the Boeing 787; 4 EBAC units control braking on the main gear s 8 wheels. EBAC (Electrical Braking Actuation Controller) 7 / CONFIDENTIAL / / SP\E\ST
9 LANDING AND BRAKING SYSTEMS A400M / LANDING: EBMA (Electrical Back-up Mechanical Actuator) An electro-hydraulic assembly developed by Messier-Bugatti-Dowty: The EBMA handles the opening and closing, in backup mode, of the landing gear doors on the A400M; Hispano-Suiza supplies the electrical drive for the EBMA, comprising an EMCU (electric motor control unit) and GBA (gearbox assembly) reduction gearbox. GBA Hybrid actuator EMCU 8 / CONFIDENTIAL / / SP\E\ST
10 ELECTRICAL SYSTEM KC390 / EEPGS (Emergency Electric Power Generation System) Emergency electric power generation system (ATA 24), The system will convert air stream in electric power for the loads that are essential for continued safe flight and landing in case of emergency. 9 / CONFIDENTIAL / / SP\E\ST
11 /02/ Thermal management of power electronics 10 / CONFIDENTIAL / / SP\E\ST
12 Thermal management in More Electrical Aircraft at equipment level High heat power density => efficient heat transfer systems Technology Capillary pumped two-phase fluid loop Mechanical pumping Two-phase fluid loops Pulsating heat pipes Heat pipes Two-phase fluid loops One-phase fluid loops Capillary pumping Conduction Radiation Heat transport capability (W.m) More efficient than Heat pipes As efficient as One-phase fluid loops: W.m Up to 100 W/cm² Passive system: no mechanical pumping 11 / CONFIDENTIAL / / SP\E\ST
13 Key Design Drivers P cap, max liq ( f ( Q, l) ) + Pvap ( f ( Q, l ) + Pgrav P ) Capillary pressure pumping capability Liquid flow pressure drop Vapor flow pressure drop Hydrostatic pressure drop Capillary pumping capability : surface tension Liquid / vapor pressure drop : dynamic viscosity and density Hydrostatic pressure drop : density Mass flow rate : Latent heat of vaporization 12 / CONFIDENTIAL / / SP\E\ST
14 /03/ Fluid specification 13 / CONFIDENTIAL / / SP\E\ST
15 Generality Commonly used fluid in capillary pumped two-phase systems: List: Water Ammonia Methanol Ethanol Acetone Only partially compliant with all aerospace application requirements New fluid is required: Performances similar to classical fluids ones Compatible with aerospace environmental requirements Water that freeze below 55 C!!! 14 / CONFIDENTIAL / / SP\E\ST
16 Environmental requirements REACH compliant Fireproof fluid: Not flammable Auto-ignition temperature > 400 C Auto-extinguishing under this temperature Temperature range: [-55 C;150 C] Fungus proof Compatible with fluid commonly used in aircrafts (see DO160-G) Compatible with common metals Dielectric fluid prefered 15 / CONFIDENTIAL / / SP\E\ST
![C;150 C] Fungus proof Compatible with fluid commonly used in aircrafts (see DO160-G)](/docs-images/46/21565666/images/page_16.jpg "Compatible with common metals Dielectric fluid prefered 15 / CONFIDENTIAL / 2012-01-19 /")
17 Thermal physical properties requirements Main typical properties: Latent heat of vaporization as high as possible: at least higher than 500 kj/kg Dynamic viscosity of vapor as low as possible: at least lower than kg/m/s Surface tension as high as possible: at least higher than N/m Vapor density at least higher than 1kg/m 3 at 80 C Other properties required : Dynamic viscosity of liquid as low as possible: at least lower than kg/m/s. Specific heat of liquid as high as possible: at least higher than 2000 W/kg/K. Specific heat of vapour as high as possible: at least higher than 1300 W/m/K. Thermal conductivity of liquid as high as possible: at least higher than W/m/K. Thermal conductivity of vapour as high as possible: at least higher than W/m/K. Density of liquid as high as possible: at least higher than 700 kg/m 3. Saturation vapor pressure must be lower than 7 Bars over the temperature range. Requirements over the whole temperature range 16 / CONFIDENTIAL / / SP\E\ST
18 /04/ Schedule of work 17 / CONFIDENTIAL / / SP\E\ST
19 Schedule and major deliverables Review of existing fluids To identify fluid kinds which are the most adequate Deliverable is expected within 2 months Synthesis of new fluid First, in silico Then, Experimental synthesis Deliverable is expected within 6 months (TBC) Experimental characterization of the synthesized fluid: Evaluation of thermal physical properties to check compliancy with requirements Deliverable expected at the project end 18 / CONFIDENTIAL / / SP\E\ST
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