Presentation on theme: "Jordi Isern Institut de Ciències de l’Espai (CSIC-IEEC) MSc in Economics of Science & Innovation Innovation & Challenges: Nanotechnology & Space (4) Launchers."— Presentation transcript:
Jordi Isern Institut de Ciències de l’Espai (CSIC-IEEC) MSc in Economics of Science & Innovation Innovation & Challenges: Nanotechnology & Space (4) Launchers
a)Forces balance b)A jet appears c)Nozzle improves the performance a b c
M·Δ v = F·Δt Change of momentum = impulse M·Δ v /Δt = F M·a = F K = ½ Mv 2 The kinetic energy has to be provided by somebody Conservation of linear momentum M·V = m·v Larger v, smaller m K increases quadratically with v No universal solution!
Chemical rockets The diference between a rocket and an aircraft jet is that the rocket has to carry out the fuel and the oxidizer They are classified as liquid, solid and hybrids –Liquid: cryogenic (i.e., liquid oxygen, liquid hydrogen) non-cryogenic (hydrogen peroxide, kerosene) –Solid: they are usually a mixture fuel (i.e., polyuretane) and oxydizer (i.e., crystalline ammonium perchlorat) Monopropellants (a single chemical component or a mixture of two stable components) and bipropellants (two components stored in separate tanks.
Liquid engines They provide an important force for a reasonable large time! The eshaust velocity is about 5 km/s Under gravity conditions (Earth or acceleration) they remain at the bottom of the tank but under zero-g drops that float. A “piston” is necessary to push the liquid towards the outlet
Solid rockets They provide a strong force in a short time extremely useful during the launch time The eshaust velocity is about 1 km/s The thrust depends on the shape of the central cavity
Ariane success story ESA is responsible for the development of all Ariane launchers and for the production and testing facilities. Ariane maiden launch on Christmas eve 1979 To date (August 2006) 172 Ariane flights have launched 287 satellites. Ariane Family 1st generation, 1979-2003: Ariane 1 (11 flights), Ariane 2 (6 flights), Ariane 3 (11 flights) Modular Ariane 4 concept (116 flights, 113 successes). 2nd generation, 1996... : Ariane 5 Generic (today’s workhorse) Ariane 5 ECA (qualified in 2005).
Ariane 5: a new launcher generation for the new century. Designed from the outset to meet the needs of the future launch market: Increased GTO mission payload lift capability Cost-effective dual launch of 3t class satellites or more More economic Launched from Europe’s Spaceport (CSG) in French Guiana. First qualification flight Ariane 5: 4 June 1996 (failure) Second qualification flight: 30 October 1997 Third qualification flight: 21 October 1998 Production/exploitation phase started in December 1999 with first Arianespace commercial flight. 120 M$
10/2004 - 82 DOUBLE LAUNCH SPACE STATION MISSIONS SINGLE LAUNCH Ariane 5: missions Main Ariane 5 missions : Launch of communications, Earth observation and scientific satellites on to Geostationary Transfer Orbit (GTO), High Earth Orbit (HEO), Sun-Synchronous Orbits (SSO). Launch of ATVs (Automated Transfer Vehicles) to service the International Space Station (Low Earth Orbit at 51,6° inclinaison). Development of the Ariane 5 launcher, its production facilities and new launch site (ELA-3) in Kourou were financed by ESA. Near ELA-3, ESA has built manufacturing facilities for the solid propellant boosters.
Small launcher programs VEGA Low Earth Orbit, Polar, Sun Synchronous Orbit Lift capability: 1500 kg in 700 km Polar orbit Launch from Europe’s spaceport (CSG) in French Guiana Three solid stages P80, Zefiro 23, Zefiro 9 A liquid upper module (Avum) to improve accuracy, reach transfer orbit, circularize the orbit and perform the de-orbiting Qualification flight in 2008. The P80 solid stage is designed to meet two objectives: Develop an advanced technology first stage for Vega Demonstrate technologies to improve Ariane 5 booster performances and competitiveness. Expected price : 20 M$
Soyuz launched from the CSG Launched from Europe’s spaceport (CSG: Guiana Space Centre), in French Guiana as from 2008. LEO (Low Earth Orbit), Polar, SSO (Sun Synchronous Orbit) orbits (4.5 – 4.9 t), GTO ( Geostasionary Transfert orbit) orbit (2.7 – 3.1 t). Exclusive commercialisation by Arianespace which extends its launch service range to complement Ariane 5 and Vega. This Euro-Russian endeavour is part, alongside with a planned cooperation on future launchers, of an ESA-Rosaviakosmos agreement on cooperation and partnership in the field of launchers. Typical cost 35 M$
Europe’s spaceport (CSG, Guiana Space Centre). Location: French Guiana, South America. Sites: ELA (Ensemble de Lancement Ariane) - Ariane 5 ELV (Ensemble de Lancement Vega) - Vega (2008) ELS (Ensemble de Lancement Soyuz) - Soyuz (2008) Launch capacity: 8 Ar5 per year from ELA 4 Vega per year from ELV 4 Soyuz per year from ELS Advantages: Payload mass gain for geostationary satellites because of proximity to the equator Launch to polar and geostationary orbits without overfly of populated aeras.
Solar Sails #Radiation pressure at the Earth orbit 10 -5 Pa #It decreases as r 2 but provides a continuous push #Technology of deploying sails is still under development #Membrane mirror First attempt Cosmos 1 (21 june 2005) Launched from a Russian submarine, but the Volna missile failed It can only work in the void!