Shijian-10 successfully completes return to Earth

by Rui C. Barbosa

Following in the steps of the Shijian-8 mission in 2006, China has successfully completed the Shijian-10 recoverable satellite mission. The launch of Shijian-10 took place at 17:38 UTC on April 5, using a Long March-2D launch vehicle from the 603 Launch Pad at the Jiuquan Satellite Launch Center’s LC43. The capsule safely returned to Earth on Monday morning.

Shijian-10 Mission:

Microgravity experiments on Shijian-10, the 24th recoverable satellite of China, covered the fields of physical science and life science.

The scientific purpose of the program is to promote the scientific research in the space microgravity environment by operating Shijian-10 at low Earth orbit for two weeks.

2016-04-05-205746There were six experiments for fluid physics, three for combustion and eight for materials science in the field of physical science.

Also on board were three experiments for radiation biology, three for gravitational biology and four for biotechnology in the field of life science.

The experiments were selected from more than 200 applications.

*A full list and overview of the experiments can be found on this link*

The satellite also carried an experiment from the European Space Agency that consisted of containers of highly pressurized crude oil will to help to improve our knowledge of oil reservoirs buried kilometers underground.

2016-04-05-205626Shijian-10 operated on a 220 x 482 km orbit at 63 degrees orbital inclination for two weeks. The launch mass of the satellite was 3,600 kg.

Space microgravity experiments in China have been completed mainly on board recoverable satellites since the 1980s (FSW program) and on board the Shenzhou manned and unmanned missions.

The launch of Shijian-8 on September 9, 2006, was a turning point for this kind of mission.

The program for Shijian-10 was organized by Chinese National Space Administration (CNSA). Ten experiments for microgravity physics and 10 experiments for space life science were selected from more than 200 applications for the mission in the late 2004 and early 2005.

The space experiments (including two in collaboration with French Space Agency and one with Europe Space Agency) were reviewed in October 2005, and the engineering proposal of satellite platform was reviewed in May 2006 by CNSA.

After this phase, the demonstration working group on “recoverable satellite of scientific experiments for space environment utilization” was formally organized, and the mission was named as Shijian-10.

Unfortunately, the demonstrative phase was stopped after one year due to the reform of CNSA and re-started when the government of China determined to move the national management of scientific satellites from CNSA to Chinese Academy of Sciences (CAS) in 2011.

The demonstration phase was then restarted and completed at the end of 2012. After that, the engineering phase of the program was started at the beginning of 2013.

2016-04-05-205706CNSA organized an expert group for microgravity research, divided into seven sub-categories: microgravity fluid physics, microgravity combustion, space material sciences, space fundamental physics, radiation biology, gravitational biology and space biotechnology.

The microgravity research and the selection of space experiments in the programs of recoverable satellites missions were arranged in the seven fields of research: Fluid physics, combustion, material science, radiation biology, gravitational biology and biotechnology.

The scientific purposes of the experiments are to promote the basic research of fluid physics and biology experiments; to support the manned space flight for fire safety research; to improve the human health by biotechnology studies; and to develop high-technology by experiments of coal combustion, material materials processing and biotechnology.

2016-04-18-150514The return of the capsule was confirmed by the Chinese State media, with further information noting separation of the capsule from the orbital module occurred at 08:15 UTC on Monday.

The orbital module will continue to function for at least three days to conduct fluid physics experiments on board.

The capsule was then confirmed to be on the ground at its landing site in Inner Mongolia. Recovery crews were soon on the scene, allowing for its safing processing to take place. It will then be transported back to China.

The Launch:

The mission began just two weeks ago, when via the launch of the Chang Zheng-2D rocket.

This launch vehicle is a two-stage rocket developed by the Shanghai Academy of Spaceflight Technology. With storable propellants is mainly used to launch a variety of low earth orbit satellites.

The development of CZ-2D was started in February 1990. From 2002, to meet the demand of SSO satellites, the payload fairing of 3.35 meters in diameter and attitude control engine for the second stage have been successfully developed; and the discharge of remaining propellant and de-orbit of the second stage have been realized.

2016-04-05-210001This launcher is mainly used for launching LEO and SSO satellites. It is characterized by high reliability, wide application and mature technology.

The CZ-2D can launch a 1,300 kg cargo in a 645 km SSO. The rocket is 41.056 meters long and the first, second stages and payload fairing are all 3.35 meter in diameter.

Its first stage is the same of the CZ-4 Chang Zheng-4. The second stage is based on CZ-4 second stage with an improved equipment bay. Lift-off mass is 232,250 kg, total length 41,056 meters, diameter 3.35 meters and fairing length 6.983 meters. At launch it develops 2961.6kN engine thrust.

The first stage has a 27.910 meter length with a 3.35 meter diameter, consuming 183,200 kg of N2O4 / UDMH (launch mass of the first stage is 192,700 kg). Equipped with a YF-21C engine capable of a ground thrust of 2,961.6 kN and a ground specific impulse of 2,550 m/s. Burn time is 170 seconds.

The second stage has a 10.9 meter length with a 3.35 meter diameter, launch mass of 39,550 kg and consuming 45,550 kg of N2O4 / UDMH. Equipped with a YF-24C cluster engine with a main engine vacuum thrust of 742.04 kN and a vernier engine with a vacuum thrust of 47.1 kN (specific impulses of 2,942 m/s and 2,834 m/s, respectively).

The CZ-2D can use two types of fairings depending on the cargo. Type A fairing has a 2.90 meters diameter (total launch vehicle length is 37.728 meters) and Type B fairing with a diameter of 3.35 meters – total launch vehicle length is 41.056 meters.

The first launch of the CZ-2D was on August 9th, 1992 from the Jiuquan Satellite Launch Center orbiting the Fanhui Shei Weixing FSW-2-1 (22072 1992-051A) recoverable satellite.

The Jiuquan Satellite Launch Center, in Ejin-Banner – a county in Alashan League of the Inner Mongolia Autonomous Region – was the first Chinese satellite launch center and is also known as the Shuang Cheng Tze launch center.

The site includes a Technical Centre, two Launch Complexes, Mission Command and Control Centre, Launch Control Centre, propellant fuelling systems, tracking and communication systems, gas supply systems, weather forecast systems, and logistic support systems.

2015-10-26-144709Jiuquan was originally used to launch scientific and recoverable satellites into medium or low earth orbits at high inclinations. It is also the place from where all the Chinese manned missions are launched.

The LC-43 launch complex, also known by South Launch Site (SLS) is equipped with two launch pads: 921 and 603. Launch pad 921 is used for the manned program for the launch of the Chang Zheng-2F launch vehicle (Shenzhou and Tiangong). The 603 launch pad is used for unmanned orbital launches by the Chang Zheng-2C, Chang Zheng-2D and Chang Zheng-4C launch vehicles.

Other launch zones at the launch site are used for launching the Kuaizhou and the CZ-11 Chang Zheng-11 solid propellant launch vehicles.

The first orbital launch took place on April 24, 1970 when the CZ-1 Chang Zheng-1 rocket launched the first Chinese satellite, the Dongfanghong-1 (04382 1970-034A).

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