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Climate change sees IOC aim to choose 2030 and 2034 Olympics hosts at same time_我的网站

A |     10月19日消息，近日，蓝箭航天“天鹊”真空型液氧甲烷发动机（ TQ-15A）在湖州成功完成了首次全系统热试车，试验时长20秒，试验过程中发动机起动关机正常、工作平稳。    Citing concerns about the effects of climate change, the International Olympic Committee said Friday it wants to pick two Winter Olympic host cities in July — putting Salt Lake City quickly into play for the 2034 edition.IOC president Thomas Bach said the Olympic body aims to confirm hosts for both the 2030 and 2034 Winter Games at its meeting on the eve of next year's Paris Olympics.Sweden, Switzerland and France have been working on possible bids for the 2030 edition and Salt Lake City officials have long targeted 2034. That would avoid the United States hosting back-to-back Olympics after the 2028 Los Angeles Summer Games.Picking Salt Lake City a decade in advance would give the IOC a trusted partner amid changing weather patterns and also could keep together people who have worked toward bringing the Olympics back the city that hosted the 2002 Games.The double award proposal by the IOC executive board still needs approval by the full membership at the Olympic body's annual meeting, which opens Sunday in Mumbai, India. That should be a formality.The IOC has declining options for Winter Games hosts. Bach noted that only 15 countries on three continents currently meet the criteria of having at least 80% of existing venues for snow sports and a “climate-reliable” outlook to host events in future decades.“We need to address very quickly this dramatic impact of climate change on winter sport,” Bach said in Mumbai. “By 2040, there remain practically just 10 NOCs who could host these snow events.”A likely longer-term project for the IOC is deciding on a rotation policy of a small pool of regular Winter Games hosts.The next deadline for the 2030 and 2034 Olympics will come Nov. 28-Dec. 1 at a board meeting in Paris. A single preferred candidate for each is expected to be chosen and then would enter into exclusive negotiations with the IOC.That is the new process for selecting Olympic host cities and regions, avoiding the once-traditional campaigns and votes which were at risk of vote-buying schemes.The Japanese city of Sapporo, which hosted the 1972 Winter Games, was once favored for the 2030 edition. That bid was officially dropped this week in fallout from criminal investigations and convictions for corruption tied to the Tokyo Olympics in 2021.___AP coverage of the Paris Olympics: https://apnews.com/hub/2024-paris-olympic-games。据介绍，TQ-15A为目前国内推力最大的真空型液氧甲烷发动机，真空推力达836千牛，是朱雀二号火箭第二批次的二级主发动机。

B | 与现有80吨+10吨的二级发动机布局方案相比，取消了游动发动机TQ-11，主发动机由不摇摆改为泵前摆，降低了二级发动机系统复杂度，总重量减轻约400千克，推力室进一步增大喷管面积比，并将涡轮排气引入推力室大喷管进行冷却，解决了涡轮排气引起的干扰力问题。

C | TQ-15A发动机真空推力提高9%、真空比冲提高130米/秒，推力调节范围拓宽至55%~110%且具备三次起动能力，可大幅提升火箭发射任务的适应性。本台TQ-15A发动机为带伺服机构不带大喷管状态，本次试车重点考核发动机系统、总装和各组合件改进方案的可行性，验证起动关机时序的正确性，获得发动机的实测性能数据及工作特性，发动机按预定程序起动和关机、工作平稳，达到了预期设计目标。本轮试车计划开展5次试车（含两次多次起动）、累计试车时间970秒，首次试车结束后将继续考核发动机长程工作可靠性、大范围推力调节时的工作适应性、发动机与伺服系统的工作协调性，多次起动、高低入口压力及过冷推进剂等各种条件下的发动机的工作适应性，全面验证发动机设计方案，并获得大喷管条件下发动机的性能数据。

D | 朱雀二号运载火箭自2017年9月立项至今，已完成了第一批次火箭技术状态的研发工作。

E | 目前，朱雀二号Y1火箭已出厂并完成低温加注合练，Y2火箭的总装工作正在嘉兴蓝箭航天中心进行。在此基础上，公司研发团队对第二批次火箭进行了研制迭代和优化改进，使之具备更优的性能和更高的可靠性。

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