2014年8月26日 星期二

working on submarine that would ‘fly’ in an ‘air bubble’ ;中國研發高超音速技術,旨在改變現代戰爭格局?

Seems unlikely to be able to do "Shanghai to San Francisco in 100 minutes," but it could still be way faster than today's fastest submarines.
The plan draws from a Cold War research on a technology called...

The Chinese are reportedly working on submarine that would ‘fly’ in an ‘air bubble’

 August 26 at 4:55 AM  
In the annals of vehicular locomotion, the submarine is the equivalent of the Walkman. It dazzled the masses when it hit, flexing nuclear-tipped missiles that completed the so-called “nuclear triad” of deterrence.
But other technologies soon surpassed it in terms of speed and agility. Now, years later, the submarine may be making a comeback — at least theoretically. Researchers at the Harbin Institute of Technology in northeast China tell the South China Morning Post that they’re hard at work on a submarine that the newspaper claims could travel the 6,100 miles from “Shanghai to San Francisco in 100 minutes.”
That’s not in the cards. But there’s plenty of reason to believe a submarine could be built that would significantly exceed the speed of today’s fastest models, which lumber along at a speed of 40 knots (about 46 mph.) It all has to do with friction and how to conquer it.
The reported plans for the super-fast Chinese submarine draw on research that reaches back to the Cold War on “supercavitation,” a technology that creates a friction-less air “bubble” around a vessel that allows it to “fly” underwater, facilitating incredible speeds. The Russians have developed torpedoes that travel faster than 230 mph using that approach.
Now researchers at Harbin’s Complex Flow and Heat Transfer Lab are reportedly figuring out how to use that science to build submarines.  “We are very excited by its potential,” lead researcher Li Fengchen, a professor of fluid machinery and engineering, told the South China Morning Post. “…Our method is different from any other approach, such as vector propulsion,” which involves engine thrust. Rather, he would lubricate the vessel in a special liquid that would reduce water friction until the vessel would reach speeds high enough to enable “supercavitation.”
How could a vessel reach such high speeds in the first place? And how would it be steered? Li says the liquid membrane would navigate the vessel. “By combining liquid-membrane technology with supercavitation, we can significantly reduce the launch challenges and make cruising easier,” he told the Chinese publication.
Increasing or decreasing the liquid membrane would manipulate friction to steer the ship. The specifics of the research are being kept under wraps for now, South China Morning Post reporter Stephen Chen told the Washington Post.
“These studies in China do not go to academic papers, but the technology is being tested in the laboratory,” he wrote in an e-mail. “The scientists have received pressure from authorities due to the sensitivity of the research and they hope the matter can cool down a bit.”
The potential of supercavitation has not gone unnoticed by the U.S. Navy. “Some technologies innovations have so significant an impact on our way of doing business that they are often described as ‘disruptive technologies,’ with the potential to change the future,” said a 2002 paper published in Undersea Warfare, the official publication of the submarine force. One of them, it said, was “‘supercavitation’ techniques.”
The Defense Advanced Research Projects Agency was once reported to be doing much the same, and Popular Science says the project would have allowed the “delivery of men and material faster than ever.” That’s exactly the end game for the Chinese research team: civilian transportation — or even swimming.


Überschallflugzeug Falcon HTV-2
美國Falcon HTV-2高超音速飛行器(資料圖片)
美國華盛頓《防務新聞》周刊亞洲部負責人顏文德(Minnick Wendell)指出,高超音速飛行器史無前例,它基本上是一個能夠在極高高度,以高超音速飛行的航天器。這種航天器能夠被用作轟炸、偵查、甚至在必要的時候打擊空間目標。
《南華早報》報導稱,美國是除中國以外世界上唯一一個擁有高超音速技術的國家。 中國首次於2014年1月成功試射了一個高超音速飛行器。同時,俄羅斯和印度也正在研發相關技術。顏文德認為,中國目前看來正在不惜一切代價開發超高速飛行器。
Überschallflugzeug Falcon HTV-2
顏文德(Minnick Wendell):“高超音速飛行器將改變現代戰爭格局”
王旭東坦言:"在軍事衝突中,解放軍發射的所有導彈都會在進入大氣層之前被美軍防禦系統攔截。"台北的中國高等政策研究會秘書長丁樹範(音)向《南華早報》表示,如果北京方面能夠成功的研發高超音速飛行器,美國現有的導彈防禦系統就可能會過時。屆時WU-14就會成為中國的全球打擊武器,並帶來巨大威脅,而且 可以直接向美國發起挑戰。