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[机型] 波音公司公开高超声速飞机验证机概念方案

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zhh894217 发表于 2018-1-13 12:43 | 显示全部楼层 |阅读模式
Boeing Unveils Hypersonic ‘Son-Of-Blackbird’ Contender
Jan 11, 2018 Guy Norris | Aerospace Daily & Defense Report
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Hypersonic vehicle design: Guy Norris
ORLANDO, Florida—Amid continuing signs of a significant upswing in U.S. hypersonic research and development, Boeing has revealed first details of a reusable Mach 5-plus demonstrator vehicle design that could pave the way for a future high-speed strike and reconnaissance aircraft.
The sharply swept, delta-winged vehicle concept builds on two decades of Boeing’s experience with the X-43 and X-51A hypersonic demonstrator programs. But it also incorporates design features from other Boeing heritage company high-speed projects including the Mach 3 XB-70 experimental bomber. Like the outwardly similar SR-72 concept revealed in 2013 by Lockheed Martin, the Boeing design also is aimed at a hypersonic successor late in the 2020s to the long-retired SR-71 Blackbird reconnaissance aircraft.

“We asked, ‘What is the most affordable way to do a reusable hypersonic demonstrator vehicle?’ And we did our own independent research looking at this question,” says Kevin Bowcutt, Boeing chief scientist for hypersonics. If the concept is selected for full-scale development, Boeing envisions a two-step process beginning with flight tests of an F-16-sized, single-engine proof-of-concept precursor vehicle leading to a twin-engine, full-scale operational vehicle with about the same dimensions as the 107-ft.-long SR-71.

The concept model was unveiled at the American Institute of Aeronautics and Astronautics SciTech forum here. Speaking to Aerospace DAILY on the sidelines of the show, Bowcutt says the twin-tail, waverider configuration continues to evolve but is already representative of a feasible hypersonic design. “It’s a really hard problem to develop an aircraft that takes off and accelerates through Mach 1 all the way to Mach 5 and beyond. The specific impulse of an air breathing engine goes down with increasing velocity, so you have to make the engine bigger to get to Mach 5. But doing that means a bigger inlet and a bigger nozzle, and trying to get that through Mach 1 is harder.”

But Bowcutt says careful integration of the airframe and propulsion system through multidisciplinary design optimization (MDO), a process in which designers incorporate all relevant disciplines simultaneously, has enabled Boeing to develop a working configuration. MDO was used to finalize the design of the X-51A
Waverider was the first vehicle to demonstrate sustained air-breathing hypersonic flight.

Although initially independently funded by Boeing, development of the hypersonic vehicle concept is continuing under Darpa’s Advanced Full Range Engine (AFRE) initiative and a closely-related turbine-based combined cycle (TBCC) flight demonstration concept study run by the U.S. Air Force Research Laboratory. Boeing’s engine partner for the concept is Orbital ATK, which in September 2017 was awarded a $21.4 million contract for the AFRE program. Boeing began work on the AFRL TBCC flight demonstrator concept study, with Orbital ATK as a subcontractor, in 2016.

The vehicle configuration is dominated by the TBCC propulsion system, which combines conventional turbine engines with dual-mode ramjets/scramjets (DMRJ). The turbine engines operate up to a sufficiently high Mach number to enable transition to the DMRJ. The engines will share a common inlet and nozzle, with the turbine cocooned after transition and then restarted once the hypersonic vehicle slows down for return to a runway landing. The inlets are divided by a prominent septum derived from the XB-70, Bowcutt says, adding that the TBCC is only one of a number of potential propulsion options. The nozzles also are separated by a prominent boat-tail divider.

“The propulsion system determines the length of the vehicle,” says Tom Smith, Boeing Research and Technology chief hypersonic aircraft designer. Although Boeing declines to discuss specific aspects of the design, the broad inlets and wide lower fuselage-mounted nacelle suggest the turbine and DMRJ in each TBCC engine are housed side-by-side rather than arranged in an over-under configuration.

The inward-turning inlets are positioned to capture the initial shockwave from the nose of the vehicle, while the sharply swept forebody chines are contoured into the relatively large-span delta wing to provide waveriding capability at hypersonic speed and sufficient lift for landing and takeoff at subsonic speed. The term waverider refers to a design in which the vehicle rides the shockwave attached to the leading edge, thus benefiting from lower induced drag. “As the narrow chine transitions to the wing, that produces a good vortex, which you care about at low speed,” Smith says.
http://aviationweek.com/defense/ ... blackbird-contender

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langge945 发表于 2018-1-13 22:38 | 显示全部楼层
这东西看起来还是高大上,不知道兔子多久公开呢?
zhyuli 发表于 2018-1-15 11:53 | 显示全部楼层
SR72的竞争方案,核心还是超燃冲压......  
hu14 发表于 2018-1-15 14:10 | 显示全部楼层
zhyuli 发表于 2018-1-15 11:53
SR72的竞争方案,核心还是超燃冲压......

超燃冲压只跑5马赫?
红水兵 发表于 2018-1-16 20:00 | 显示全部楼层
hu14 发表于 2018-1-15 14:10
超燃冲压只跑5马赫?

亚燃超压的上限不是4马赫么?
 楼主| zhh894217 发表于 2018-1-16 22:47 | 显示全部楼层
现阶段DARPA的AFRE项目TBCC发动机的目标也是Ma5+
自强不息 发表于 2018-1-17 19:52 来自航空航天港手机版! | 显示全部楼层
红水兵 发表于 2018-1-16 20:00
亚燃超压的上限不是4马赫么?

应该是4.5马赫,我记得中国已经研制成功了。
红水兵 发表于 2018-1-17 19:57 | 显示全部楼层
自强不息 发表于 2018-1-17 19:52
应该是4.5马赫,我记得中国已经研制成功了。

那就应该是超燃冲压发动机技术了。
自强不息 发表于 2018-1-17 20:03 来自航空航天港手机版! | 显示全部楼层
红水兵 发表于 2018-1-17 19:57
那就应该是超燃冲压发动机技术了。

还是亚燃的,超然冲压起步就是5马赫。
红水兵 发表于 2018-1-17 21:40 | 显示全部楼层
自强不息 发表于 2018-1-17 20:03
还是亚燃的,超然冲压起步就是5马赫。

高超声速飞行器:发动机如何“混搭”才能更快
http://www.cannews.com.cn/2016/0310/149611.shtml

目前,世界航空航天领域已经有了多种不同成熟程度的推进装置,如涡轮风扇发动机、涡轮喷气发动机、冲压发动机、超燃冲压发动机、火箭发动机等。这些不同的推进装置在不同的飞行速度、高度段内都有其最佳的适用范围。研究表明,从地面马赫数Ma=0开始,在大气层内经历各种高度不断加速、直至达到入轨速度(约Ma=25),这样大的工作范围内,不同动力形式的最佳工作范围大致可分为:
(1)Ma=0~3:是目前燃气涡轮发动机已经达到的飞行速度,如米格25和美国黑鸟SR71的飞行马赫数已超过3。
(2)Ma=3~5:是采用碳氢燃料的亚燃冲压发动机的有利工作范围。
(3)Ma=4~10:是使用氢燃料的超声速冲压发动机的有利工作范围,其中亚燃冲压发动机转换到超燃的Ma可选为4~5。
(4)Ma=10~15:为超高速(Hypervelocity)飞行范围,如以冲压发动机为动力则应发展超高声速燃烧冲压发动机。
(5)Ma>25:为入轨速度,只有火箭发动机才能将飞行器加速到这样高的飞行速度。
红水兵 发表于 2018-1-17 21:47 | 显示全部楼层
自强不息 发表于 2018-1-17 19:52
应该是4.5马赫,我记得中国已经研制成功了。


国内2012年首次实现了轴对称式高超声速飞行器成功试飞,飞行高度超过20km,飞行速度大于5.0马赫数,初步验证了吸气式超燃冲压发动机及轴对称式飞行器的制导与控制技术。
(《2012-2013航空科学技术学科发展报告》,中国科学技术出版社,2014,p152)


2015年12月12日,临近空间科学与技术飞行试验平台在酒泉卫星发射中心成功进行了首发飞行试验。该平台飞行试验的成功,使其成为继美国和澳大利亚联合研制的HiFIRE后第二个低成本临近空间高超声速通用试飞平台。这为我国近空间基础科学问题研究提供飞行试验研究平台,大幅降低研制成本和风险、缩短研制周期。该平台项目受到国家自然科学基金委“近空间飞行器关键基础科学问题”重大研究计划的资助。
Nighthawk 发表于 2018-1-17 22:15 | 显示全部楼层
请保持话题在波音的机型和相关技术上,谢谢!
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