Military Technology

At the Northwest Research Center Airport, Wu Hao's special plane landed on the runway smoothly. The hatch opened, and a gust of cold wind blew in, causing Wu Hao to slip over his clothes. At this moment, the Northwest Research Center has been covered with a thin layer of snow, and there is a vast expanse of white everywhere. The warm and humid air from the southeast, after encountering the Siberian cold wind, gathered here to form precipitation, and finally scattered into pieces of snowflakes. The desert is not what people think. It also rains and snows here, but the annual evaporation is too large, and all the little precipitation is evaporated. Of course, this is a warmer time. At least in this long winter, the snow will always cover the entire desert because of the low temperature here. Until the ice and snow melt in the next year, the yellow sand and Gobi will be revealed, and this is also the rise of sandstorms every year. when. As he walked down the hanging ladder, several people who had been waiting for a long time immediately greeted him and surrounded him in the middle to block the fierce cold wind. "Mr. Wu, you have worked hard all the way." Yu Chengwu said enthusiastically to Wu Hao. Wu Hao smiled and shook hands with him and said, "Didn't I tell you guys, don't use it to pick me up, I'll just go directly. I'm already very familiar with this place, so I won't get lost." Hehe, you are here for us The greatest support, I must come to pick you up. Besides, this time the test site is still more than 100 kilometers away from our base, and the road below will be a little difficult. Yu Chengwu said at Wu Hao with a smile. Oh, did you change the landing ground? Wu Hao was a little surprised when he heard the words. Yes. Yu Chengwu smiled and nodded and explained: "We will put two satellites into orbit for this launch, so the first half of the entire mission is a normal commercial payload launch. Only after the satellites are put into orbit, our experiments will officially start. Before, we only used the ground orbit test near the Carmen line, and this time the orbital altitude of these two satellites is above 180 kilometers, which also means that our second-stage rocket will fly to this altitude After that, it will re-enter the atmosphere. Therefore, in order to save fuel, we must choose the landing site of the secondary rocket as far as possible to the far end of the launch trajectory, so that the secondary rocket can land better. However, generally two The wreckage of the first stage rocket is more than 1,000 kilometers away from the launch, and it is basically located in a place behind the poor population. It is obviously inappropriate to set up a normalized fixed landing site. Therefore, we can only use the landing site , I chose to go to a place that is open and uninhabited, and is relatively close to the remote secondary splash point. Moreover, the new landing site is larger than our original landing site, which is more conducive to our landing recovery work. In addition, It can also solve the safety problems in the recovery process of the second-stage rocket in the future. However, because this landing site is in the construction stage, the current infrastructure is not perfect, and even the road to the landing site has not been repaired. Let's go to the landing site this time. The landing site, to cross a desert dirt road, it may be a little bumpy, please forgive me." What's the matter, I'm not made of tofu, so I'm afraid of bumps. Wu Hao replied with a smile, and then said: "How is the preparation at the launch site? Although our main purpose this time is the return landing experiment of the second stage rocket, but after all, we have to launch two satellites. , can't be taken lightly." Please rest assured. Yu Cheng's military commander Wu Hao asked him to get into the car, and then sat next to Wu Hao and said with a smile: "Our rocket launch mission is our mature technical team with very rich experience and has been responsible for more than a dozen large-scale launch missions before. , have all been successful. This time they are in charge of the launch mission, there should be no problem." Well, Wu Hao nodded with a smile, and then immediately asked: "How is the preparation for the safety work? Be lax, let alone be careless." "Don't worry, we also attach great importance to this. In addition to the repeated inspection and demonstration experiments in the early stage, we have checked several times during the entire launch, including the return and landing process, and prepared a lot of countermeasures accordingly. . Once there is a problem, we will immediately deal with it according to the pre-eucalyptus to ensure that the entire launch and experiment process is foolproof. Of course, we are also prepared for the worst. All personnel within a range of tens of kilometers from the landing site will be evacuated During the cleanup, including the entire return and landing process, we will also monitor it in real time and track the flight status of the secondary rocket in real time. If necessary, we can also intercept it autonomously, or request the Air Force Air Defense Force to help us intercept it. In order to ensure that this second-stage rocket will not fly around and fall into other areas because of the loss of control. Of course, this is the worst plan, and we will definitely not choose until the last moment. "Yu Chengwu smiled at Wu Hao. said. As for Wu Hao, he saw a trace of pressure and tension in his smile. You must know that this re-entry and return landing test mission ~www.readwn.com~ is very difficult, far more difficult than the technology of manned spacecraft returning to landing. Because the second-stage rocket increases the thrust-to-weight ratio in order to reduce weight and increase fuel, the entire structural material is relatively light, which also causes its strength to be far less than that of the return capsule of a manned spacecraft. In the process of high-speed descent, especially in the process of high-speed friction during re-entry into the atmosphere, it is very likely that the entire rocket body will disintegrate in the atmosphere and burn out due to insufficient strength. In addition, it will also be affected by airflow at low and medium altitudes, so that the flight attitude, trajectory, and landing point launch offset. And this will constantly test the entire secondary rocket flight control system. It needs to monitor the flight attitude, trajectory, and estimated landing point of the secondary rocket in real time, and make real-time control corrections. In addition, the entire secondary rocket needs to be decelerated many times in outer space, atmosphere, mid-air, low-altitude, and near-ground. This process is also very important, and it is directly related to whether the secondary rocket can return safely and smoothly. Landing. If the speed is too slow, it is easy to consume fuel, so that the second-stage rocket body has not yet landed, and the fuel has been consumed. There is not much fuel to support the deceleration of the later stages, which also leads to too fast speed, causing the second stage rocket to crash. Similarly, if the deceleration fails and the speed is too fast, then it is likely to disintegrate and burn directly in the atmosphere, or directly hit the ground like a warhead or a meteor. Such a large arrow body, plus the remaining fuel in it, smashed down from such a high airspace at such a fast speed, its power is very terrifying. This is also the reason why he attached so much importance to the return of the second-stage rocket to the landing experiment and came to the scene in person.