roccoschili Page 474
Page 474
The red-smoke nitric acid-unsymmetrical dimethylhydrazine rocket engine with a thrust of 42 tons was ignited, and an orange-red flame was sprayed downward.The flames were bent by the sloping ground, and a thick smoke drifted along the wind towards the barren valley.
The engine building was built just at the intersection of the two valleys, so that whether it was a northerly or southerly wind, the engine building could test the engines and let the flames and smoke blow to a safe area.
Both Tang Hua and Qian Xuesen were looking at their watches.
这是DF-1（原来钱学森自定D-1的型号，刚刚被改为DF-1）和TK-3用的火箭发动机的600秒长时间试车。
"The specific impulse of unsymmetrical dimethylhydrazine fuel is indeed high, but it is more troublesome to refuel in the field." Tang Hua said, "I thought I should try the red smoke nitric acid-kerosene engine."
Qian Xuesen: "It is first and foremost a sounding rocket..."
60 seconds.
In the engine building, the RD42 engine with a thrust of 42 tons continues to breathe fire.
The orange-red flame slowly turned into white smoke in the valley, and the density of the white smoke was still high, moving along the bottom of the valley.
120 seconds.
The white smoke had extended for more than one kilometer in the valley, and Tang Hua and Qian Xuesen couldn't see the end.
"I seem to have seen the jet of the engine become a little smaller just now?" Qian Xuesen said suddenly, "Is the thrust uneven?"
Tang Hua: "Call and ask."
On the other side of the phone, the staff in the engine building immediately observed and read the test equipment and told Qian Xuesen that the thrust fluctuation value of the engine in the last 60 seconds was within the normal range, 41.2 tons to 42.8 tons, and there was no accident.
140 seconds.
If the RD42 engine is installed on the DF-1 ballistic missile, the engine should have been turned off at this moment, and the missile has entered the approximate parabolic flight stage.
Even mounted on a TK-3 sounding rocket, it should burn out after about 150 seconds.
But to test the ultimate strength and ultimate performance of the engine, a 600-second test run is still required.
It's also an extreme way to find flaws in your design.
For example, some weak points have a one-thousandth probability of failure when the engine works for 100 seconds (it exceeds the standard and must be improved), so if the engine works continuously for 600 seconds, the probability of failure in this part may reach 50%. or even higher.Once this problem is discovered, additional reinforcement can be made to the weak points of the design.
300 seconds.
400 seconds.
……
by.
12月初涡轮泵联试车、12月底首次点火、1月份第二、第三次短时试车，2月上旬进行600秒长程试车。
RD42发动机不用做摇摆试车和长程摇摆试车。600秒二次通过后，RD42的设计工作就差不多进入收尾阶段。这意味着，1955年8~9月，第一枚TK-3或者DF-1的测试飞行应该是不会掉链子了。
Chapter 77, the Bandung Conference is not yet open
Qian Xuesen's launch vehicle and ballistic missile team is getting better and better.
This team is quite different from Tang Hua's various project teams in the past.
Tang Hua's team is Tang Hua's argumentation, Tang Hua's planning, and Tang Hua's design. In the design realization stage, the team he recruited began to play a role, controlling the production, delivery and quality control of each major part, and at most it was a bit of a marginal design. To be perfect.
This is especially true with T50 and T51 computers.
Later, the X group researched integrated circuits, and they organized two strong generals, Professor Huang and Xie Xide, to participate, which was better than the T50 and T51 computers, but it was Tang Hua who demonstrated the general direction of development and the overall plan.
For the development and industrial production of optical fiber, the theory was handed over to Zhao Zhongyao, and the engineering was handed over to Wang Dayan, which is a little more advanced than the X team.
Qian Xuesen's team featured holding "Technical Democracy Meetings". To do something, Qian Xuesen didn't immediately decide on the general plan, but asked the leaders of several groups to think about it first, and then bring the thinking results to the meeting. Brainstorming.
If there is no cheating by crossing the perspective, Qian Xuesen's team research and development method is actually correct...
It has only been more than a year since Qian Xuesen returned to China, and a group of people such as Yao Tongbin, Tu Shou'e, Huang Weilu, Ren Xinmin and others have quickly formed a launch vehicle/ballistic missile design and planning team that performs their duties but understands each other. Together with Qian Xuesen, they are going " R&D one generation, plan one generation, demonstrate one generation" drum-type research and development road.
研发一代指的是射程600公里的DF-1以及能上太空的TK-3探空火箭。规划一代是DF-2中导，论证一代是DF-3远导。
For example, in the test of the engine building today, in addition to the 1-second long-range test of the engine used by DF-600, the ignition test of the first-stage engine of DF-2 was also carried out.
As a medium-range missile with a standard range of 1800 kilometers, DF-2 is larger and faster than DF-1, and the thrust required by the first-stage engine is also greater.
……
It took almost a day to return to Beijing from Chengde.
Back in Beijing, Tang Hua was catching up with the memorial service of Mr. Zhang Lan, vice chairman of the National People's Congress and former vice chairman of the Chinese People's Political Consultative Conference.
"According to the chairman's amnesty, Du Yuming and Xue Yue have left the Gongde Forest and settled down."
Ye Ting, newly elected vice chairman of the Chinese People's Political Consultative Conference last December, said next to Tang Hua.
"You sponsored Mr. Du Yuming's eldest son studying in the United States last year? He wants to thank you in person."
Tang Hua: "Oh, so fast?"
If it were not for the plan to release Zhang Gan, Xue Yue, and Chang Jingguo early, Du Yuming should have come out in 1959 when the first batch of amnesty of Gongdelin was released.
"Let me ask the Prime Minister first. If there is no problem, we can meet each other."
……
"Mr. Tang, hello..."
"Mr. Du, you don't have to be so polite. I'm a junior. You can just sit down."
Tang Hua and United Front Work Minister Li Weihan went to see Du Yuming together.
Tang Hua took a step forward and helped Du Yuming sit back in the chair.
As a person born in 1904, Du Yuming's body collapsed in his 40s. When he entered Gongdelin, his whole body was full of problems. When he woke up from sleep, his spine would remain in the shape of the pressure from lying on his side, and he could not restore it all morning.
"As for me, I also inadvertently learned that your son is studying in the United States, and the backup is weak."
Tang Hua said, "Because I know someone better, your son-in-law Yang Zhenning. After getting online with Yang Zhenning, I turned a few corners and knew the current situation of your family."
In 1949, 27-year-old Yang Zhenning entered the Princeton Institute for Advanced Study as a postdoctoral fellow.The dean at that time was Oppenheimer. He said in his autobiography that his favorite scene at that time was Yang Zhenning, Li Zhengdao, and Fermi discussing particle models on the grass in Princeton.
In 1954, Yang Zhenning was already well-known, because he proposed the theoretical structure of the non-Abelian gauge field, and stepped into the club of "physicists".
Du Yuming: "My youngest daughter and son-in-law are studying physics in Princeton. Oh, speaking of it, I should persuade them to return to China and use their knowledge to serve the country."
Tang Hua: "No, no, no. Yang Zhenning's research direction, how should I put it, is too advanced. Only in the United States can we have sufficient material conditions to carry out. We can't give these conditions when we return to China."