Korean projectile “Nuri”, re-challenge for the first time in 8 months … Today “real satellite” is loaded into space | Joongang Ilbo | JoongAng Ilbo

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Ⓒ JoongAng Ilbo / JoongAng Ilbo Japanese version2022.06.21 07:41

On the 21st, the Korean-type projectile “Nuri (KSLV-II)” will challenge again to fly into space. The most promising launch time is 4:00 pm.

On the 14th of this month, the Nuri was postponed to the launch pad due to strong winds, and the launch was postponed for one day. It was set up on the launch pad on the 15th, but it was once taken down due to a malfunction of the sensor and was taken to the assembly building again. The Ministry of Science and ICT and the Korea Aerospace Research Institute conducted inspection work on the Nuri in the assembly building on the 16th to 19th, and then on the 20th, the Nuri was launched at the Naro Space Center in Goheung-gun, Jeollanam-do. Transferred to the second launch pad.

The Nuri, which completed the launch pad standing work on the morning of the 20th, completed the connection of the umbilical (equipment that supplies propellant and electricity to the Nuri) and the confidential inspection (checking for fuel leaks) in the afternoon. The Ministry of Science and ICT will hold a launch management committee on the morning and afternoon of the 21st to decide the launch time. If all this process is completed without any problems, the Nuri will be launched into space this afternoon.

The Nuri is a space launcher developed to launch a 1.5-ton class practical satellite into low earth orbit (600-800 kilometers). At the time of the first launch last year, it was launched with a 1.5-ton dummy satellite (satellite replica) that was not a real satellite. This time, a “real satellite” will be installed. It is a performance verification satellite weighing 162.5 kilograms and four CubeSats. In order to adjust the overall weight of the onboard satellite to 1.5 tons, we will launch an onboard with a 1.3 ton dummy satellite attached to the performance verification satellite.

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The performance verification satellite aims to carry out its mission for two years. The four CubeSats mounted on the performance verification satellite were developed by Korea University, Seoul National University, Yonsei University, and Korea Advanced Institute of Science and Technology (KAIST). They are sequentially separated in space and carry out missions such as observations, observations of the Earth’s atmosphere, and monitoring of particulate matter.

At the time of the first launch, the Nuri successfully performed stage separation and fairing (cap covering the dummy satellite) separation. However, the third stage engine, which should burn for 521 seconds, could only burn for 475 seconds, so the power was insufficient and the final target of putting the dummy satellite into orbit could not be reached.

The Nuri Launch Investigation Commission has analyzed a total of more than 2,600 data in detail to find the cause of the failure. As a result, the fixing device of the high-pressure helium tank of the oxidant tank of the third stage rocket melted and helium leaked out, so the amount of oxidizer that should enter the third stage engine decreased, and the third stage engine started. The result was that it burned before reaching the scheduled timeline. “We have completed all the replacement and reassembly work through a new design that reinforces the structure,” said Ko Jung-hwan, general manager of projectile development at Kouken. Electrical inspections such as the first-stage oxidizer tank sensor, which became a problem last week, have also been completed.

The Nuri, which has a total length of 47.2 meters and a weight of about 200 tons, has a three-stage structure. Four 75-ton class liquid engines are clustered (bundle) in the first stage. A high-difficulty technique was applied in which the four engines were put together in an accurate alignment and operated like a single 300-ton class engine.

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When the first stage engine reaches a propulsion force of 300 tons, the Nuri will be launched with an order to release the fixing device. 127 seconds after the launch, the first stage will separate at an altitude of 59 kilometers and fall into the sea near Kyushu, Japan, about 413 kilometers away from the launch site. At 233 seconds after launch, the fairing at the tip of the third stage rocket separates, and when it reaches 274 seconds, the second stage separates at an altitude of 258 kilometers.

When you reach 700 kilometers above the target, you will reach the final barrier. It is a process of sequentially separating the performance verification satellite and the dummy satellite mounted on the Nuri. The performance verification satellite will be separated 897 seconds after takeoff, and the dummy satellite will be separated 967 seconds after takeoff. It takes about 30 minutes to confirm the data to see if this process was successful. Approximately 42 minutes after the launch, the first communication with the ground station will take place at the Sejong base in Antarctica.

“If the target orbit is 700 kilometers and the error is within ± 35 kilometers, which is an error of 5%, it can be judged that the Nuri was successful,” said Chang Young-soon, director of the projectile responsibility development department at Kouken. If the second launch of the Nuri is successful, South Korea will become the seventh nation in the world to launch a practical satellite of 1 ton or more on its own.

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