Space launch

Summary

Space launch is the earliest part of a flight that reaches space. Space launch involves liftoff, when a rocket or other space launch vehicle leaves the ground, floating ship or midair aircraft at the start of a flight. Liftoff is of two main types: rocket launch (the current conventional method), and non-rocket spacelaunch (where other forms of propulsion are employed, including airbreathing jet engines or other kinds).

Issues with reaching space

Definition of outer space

A white rocketship with oddly-shaped wings at rest on a runway.
SpaceShipOne completed the first human private spaceflight in 2004, reaching an altitude of 100.12 km (62.21 mi).[1]

There is no clear boundary between Earth's atmosphere and space, as the density of the atmosphere gradually decreases as the altitude increases. There are several standard boundary designations, namely:

  • The Fédération Aéronautique Internationale has established the Kármán line at an altitude of 100 km (62 mi) as a working definition for the boundary between aeronautics and astronautics. This is used because at an altitude of about 100 km (62 mi), as Theodore von Kármán calculated, a vehicle would have to travel faster than orbital velocity to derive sufficient aerodynamic lift from the atmosphere to support itself.[2][3]
  • The United States designates people who travel above an altitude of 50 mi (80 km) as astronauts.[4]
  • NASA's Space Shuttle used 400,000 feet (122 km, 76 mi) as its re-entry altitude (termed the Entry Interface), which roughly marks the boundary where atmospheric drag becomes noticeable, thus beginning the process of switching from steering with thrusters to maneuvering with aerodynamic control surfaces.[5]
In 2009, scientists reported detailed measurements with a Supra-Thermal Ion Imager (an instrument that measures the direction and speed of ions), which allowed them to establish a boundary at 118 km (73.3 mi) above Earth. The boundary represents the midpoint of a gradual transition over tens of kilometers from the relatively gentle winds of the Earth's atmosphere to the more violent flows of charged particles in space, which can reach speeds well over 268 m/s (600 mph).[6][7]

Energy

Therefore, by definition for spaceflight to occur, sufficient altitude is necessary. This implies a minimum gravitational potential energy needs to be overcome: for the Kármán line this is approximately 1 MJ/kg. W=mgh, m=1 kg, g=9.82 m/s2, h=105m. W=1*9.82*105≈106J/kg=1MJ/kg

In practice, a higher energy than this is needed to be expended due to losses such as airdrag, propulsive efficiency, cycle efficiency of engines that are employed and gravity drag.

In the past fifty years spaceflight has usually meant remaining in space for a period of time, rather than going up and immediately falling back to earth. This entails orbit, which is mostly a matter of velocity, not altitude, although that does not mean air friction and relevant altitudes in relation to that and orbit don't have to be taken into account. At much, much higher altitudes than many orbital ones maintained by satellites, altitude begins to become a larger and larger factor and speed a lesser one. At lower altitudes, due to the high speed required to remain in orbit, air friction is a very important consideration affecting satellites, much more than in the popular image of space. At even lower altitudes, balloons, with no forward velocity, can serve many of the roles satellites play.

G-forces

Many cargos, particularly humans have a limiting g-force that they can survive. For humans this is about 3-6 g. Some launchers such as gun launchers would give accelerations in the hundred or thousands of g and thus are completely unsuitable.

Reliability

Launchers vary with respect to their reliability for achieving the mission.

Safety

Safety is the probability of causing injury or loss of life. Unreliable launchers are not necessarily unsafe, whereas reliable launchers are usually, but not invariably safe.

Apart from catastrophic failure of the launch vehicle itself other safety hazards include depressurisation, and the Van Allen radiation belts which preclude orbits which spend long periods within them.

Trajectory optimization

Trajectory optimization is the process of designing a trajectory that minimizes (or maximizes) some measure of performance while satisfying a set of constraints. Generally speaking, trajectory optimization is a technique for computing an open-loop solution to an optimal control problem.[8] It is often used for systems where computing the full closed-loop solution is not required, impractical or impossible. If a trajectory optimization problem can be solved at a rate given by the inverse of the Lipschitz constant,[9] then it can be used iteratively to generate a closed-loop solution in the sense of Caratheodory. If only the first step of the trajectory is executed for an infinite-horizon problem, then this is known as Model Predictive Control (MPC).

Although the idea of trajectory optimization has been around for hundreds of years (calculus of variations, brachystochrone problem), it only became practical for real-world problems with the advent of the computer. Many of the original applications of trajectory optimization were in the aerospace industry, computing rocket and missile launch trajectories. More recently, trajectory optimization has also been used in a wide variety of industrial process and robotics applications.

Carbon emissions

Many rockets use fossil fuels. A SpaceX Falcon Heavy rocket for instance burns through 400 metric tons of kerosene and emits more carbon dioxide in a few minutes than an average car would in more than two centuries. As the number of rocket launches is expected to increase heavily in the coming years, the effect that launching into orbit has on Earth is expected to get much worse.[neutrality is disputed] Some rocket manufacturers (i.e. Orbex, ArianeGroup) are using different launch fuels (such as bio-propane,methane produced from biomass, ...).[10] Blue Origin's BE-3 uses liquid hydrogen/liquid oxygen and BE-7 uses hydrogen and oxygen propellants in a dual-expander combustion cycle.

Sustained spaceflight

Suborbital launch

Sub-orbital space flight is any space launch that reaches space without doing a full orbit around the planet, and requires a maximum speed of around 1 km/s just to reach space, and up to 7 km/s for longer distance such as an intercontinental space flight. An example of a sub-orbital flight would be a ballistic missile, or future tourist flight such as Virgin Galactic, or an intercontinental transport flight like SpaceLiner. Any space launch without an orbit-optimization correction to achieve a stable orbit will result in a suborbital space flight, unless there is sufficient thrust to leave orbit completely. (See Space gun#Getting to orbit)

Orbital launch

In addition, if orbit is required, then a much greater amount of energy must be generated in order to give the craft some sideways speed. The speed that must be achieved depends on the altitude of the orbit – less speed is needed at high altitude. However, after allowing for the extra potential energy of being at higher altitudes, overall more energy is used reaching higher orbits than lower ones.

The speed needed to maintain an orbit near the Earth's surface corresponds to a sideways speed of about 7.8 km/s (17,400 mph), an energy of about 30MJ/kg. This is several times the energy per kg of practical rocket propellant mixes.

Gaining the kinetic energy is awkward as the airdrag tends to slow the spacecraft, so rocket-powered spacecraft generally fly a compromise trajectory that leaves the thickest part of the atmosphere very early on, and then fly on for example, a Hohmann transfer orbit to reach the particular orbit that is required. This minimises the airdrag as well as minimising the time that the vehicle spends holding itself up. Airdrag is a significant issue with essentially all proposed and current launch systems, although usually less so than the difficulty of obtaining enough kinetic energy to simply reach orbit at all.

Escape velocity

If the Earth's gravity is to be overcome entirely then sufficient energy must be obtained by a spacecraft to exceed the depth of the gravity potential energy well. Once this has occurred, provided the energy is not lost in any non-conservative way, then the vehicle will leave the influence of the Earth. The depth of the potential well depends on the vehicle's position, and the energy depends on the vehicle's speed. If the kinetic energy exceeds the potential energy then escape occurs. At the Earth's surface this occurs at a speed of 11.2 km/s (25,000 mph), but in practice a much higher speed is needed due to airdrag.

Types of space launch

Rocket launch

Larger rockets are normally launched from a launch pad that provides stable support until a few seconds after ignition. Due to their high exhaust velocity—2,500 to 4,500 m/s (9,000 to 16,200 km/h; 5,600 to 10,100 mph)—rockets are particularly useful when very high speeds are required, such as orbital speed at approximately 7,800 m/s (28,000 km/h; 17,000 mph). Spacecraft delivered into orbital trajectories become artificial satellites, which are used for many commercial purposes. Indeed, rockets remain the only way to launch spacecraft into orbit and beyond.[11] They are also used to rapidly accelerate spacecraft when they change orbits or de-orbit for landing. Also, a rocket may be used to soften a hard parachute landing immediately before touchdown (see retrorocket).

Non-rocket launch

Non-rocket spacelaunch refers to concepts for launch into space where some or all of the needed speed and altitude are provided by something more powerful or other than rockets, or by other than expendable rockets.[12] A number of alternatives to expendable rockets have been proposed.[13] In some systems such as a combination launch system, skyhook, rocket sled launch, rockoon, or air launch, a rocket would be part, but only part of the system used to reach orbit.

Present-day launch costs are very high – $2,500 to $25,000 per kilogram from Earth to low Earth orbit (LEO). As a result, launch costs are a large percentage of the cost of all space endeavors. If launch can be made cheaper, the total cost of space missions will be reduced. Due to the exponential nature of the rocket equation, providing even a small amount of the velocity to LEO by other means has the potential of greatly reducing the cost of getting to orbit.

Launch costs in the hundreds of dollars per kilogram would make possible many proposed large-scale space projects such as space colonization, space-based solar power[14] and terraforming Mars.[15]

References

  1. ^ Michael Coren (July 14, 2004), "Private craft soars into space, history", CNN.com, archived from the original on April 2, 2015.
  2. ^ O'Leary 2009, p. 84.
  3. ^ "Where does space begin? – Aerospace Engineering, Aviation News, Salary, Jobs and Museums". Aerospace Engineering, Aviation News, Salary, Jobs and Museums. Archived from the original on 2015-11-17. Retrieved 2015-11-10.
  4. ^ Wong & Fergusson 2010, p. 16.
  5. ^ Petty, John Ira (February 13, 2003), "Entry", Human Spaceflight, NASA, archived from the original on October 27, 2011, retrieved 2011-12-16.
  6. ^ Thompson, Andrea (April 9, 2009), Edge of Space Found, space.com, archived from the original on July 14, 2009, retrieved 2009-06-19.
  7. ^ Sangalli, L.; et al. (2009), "Rocket-based measurements of ion velocity, neutral wind, and electric field in the collisional transition region of the auroral ionosphere", Journal of Geophysical Research, 114 (A4): A04306, Bibcode:2009JGRA..114.4306S, doi:10.1029/2008JA013757.
  8. ^ Ross, I. M. A Primer on Pontryagin's Principle in Optimal Control, Collegiate Publishers, San Francisco, 2009.
  9. ^ Ross, I. Michael; Sekhavat, Pooya; Fleming, Andrew; Gong, Qi (March 2008). "Optimal Feedback Control: Foundations, Examples, and Experimental Results for a New Approach". Journal of Guidance, Control, and Dynamics. 31 (2): 307–321. doi:10.2514/1.29532. ISSN 0731-5090.
  10. ^ Can we get to space without damaging the Earth through huge carbon emissions
  11. ^ "Spaceflight Now-worldwide launch schedule". Spaceflightnow.com. Archived from the original on 2013-09-11. Retrieved 2012-12-10.
  12. ^ "No Rockets? No Problem!". Popular Mechanics. 2010-10-05. Retrieved 2017-01-23.
  13. ^ George Dvorsky (2014-12-30). "How Humanity Will Conquer Space Without Rockets". io9.
  14. ^ "A Fresh Look at Space Solar Power: New Architectures, Concepts, and Technologies. John C. Mankins. International Astronautical Federation IAF-97-R.2.03. 12 pages" (PDF). Archived from the original (PDF) on 2017-10-26. Retrieved 2012-04-28.
  15. ^ Robert M. Zubrin (Pioneer Astronautics); Christopher P. McKay. NASA Ames Research Center (c. 1993). "Technological Requirements for Terraforming Mars".

External links

  • http://www.spacelaunchreport.com/ A periodic news digest of worldwide space launch activity.
  • LATEST SATELLITE LAUNCHES from http://www.n2yo.com/
  • The Space Review is an online publication devoted to in-depth articles, commentary, and reviews regarding all aspects of space exploration.