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蓝箭真空型液氧甲烷发动机完成首次全系统试车：国内推力最大_我的网站

一 |     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。

二 |     Colombo, Oct 20 (UNI) The prevailing economic crisis could deal a severe blow to many Sri Lankan business sectors if it deepens or drags for a prolonged period, Fitch Ratings said in remarks published on Thursday.
This is because runaway inflation, elevated interest rates and import restrictions have already pressured their revenues, margins, profits and cash flows, the Daily Mirror quoted Fitch Ratings as saying.
In a brief commentary on the implications the economic crisis would have on Sri Lanka’s listed companies, the rating agency identified consumer goods retail, power generation and home building among the most affected sectors from a prolonged crisis.
While some businesses did not feel the full effects of the crisis as they managed to grow their top and bottom lines and their margins in the second quarter ended in June 2022, Fitch said they would not be able to replicate the same results in the coming quarters as price hikes could come at the cost of further decline in revenues.
The September earnings season, which kicked off this week, would provide analysts and investors the opportunity to assess how these companies representing wider industries have fared on the back of continued rise in costs across the supply chains as well as of their borrowings, it said.
The Sri Lankan economy is projected to be in continuous decline in 2022 and 2023, shedding 9.2 per cent and 4.2 per cent, respectively, according to the World Bank estimates.
“Significant cost inflation affecting demand and profitability, import restrictions disrupting operations and high interest rates are key risks faced by domestic corporations in the next 12-18 months,” Fitch Ratings said.
If these conditions persist in the said time horizon, worsening the economic conditions, Fitch estimates around 50 per cent of its rated issuers to see rating pressure.
UNI MR。

三 | 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。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。

四 | 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。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。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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Published on:14:54:54