主题:大飞机从707到340没有多大变化,未来是音速巡航? -- intools
(1)传统的管身加翼,
(2)blended wing-body,
(3)hybrid flying wing,
(4)flying wing.
Note that the progression does not represent either a chronological or technical progression; the YB-49, representing a true flying wing, actually predates all other depicted aircraft, while the "conventional" Boeing 757 is a relatively new and technologically advanced aircraft.
Blended wing body
Blended Wing Body, or BWB, designates an alternative airframe design which incorporates design features from both a traditional tube and wing design into a hybrid flying wing configuration. The claimed advantages (see Potential Advantages below) of the BWB approach are efficient high-lift wings and a wide airfoil-shaped body. This enables the entire craft to contribute to lift generation with the result of potentially increased fuel economy.
Overview
Flying wing designs are defined as having no separate body, only a single wing, though there may be structures protruding from the wing. Blended wing/body aircraft have a flattened and airfoil shaped body, which produces most of the lift to keep itself aloft, and distinct and separate wing structures, though the wings are smoothly blended in with the body.
An early aircraft exhibiting BWB design principles was the Junkers G.38, which flew in 1929. This "super jumbo" airliner of its day, seated thirty-four passengers, six in each of its two meter thick wings, and the balance in the central fuselage. In comparison, a contemporary passenger aircraft, the Ford Trimotor, carried a total of nine passengers in its more traditional wing and box fuselage design.
In some ways, the B-2 Spirit stealth bomber is a design which falls between classic flying wing concepts and the BWB concept. It is usually classified as a flying wing, however, as the protruding body sections are not much larger than the underlying wing shape structure.
Currently, both NASA and Boeing are exploring BWB designs under the designation X-48[1]. Studies suggest that BWB aircraft, configured for passenger flight, could carry from 450 to 800 passengers and achieve fuel savings of over 20 percent. NASA has been developing, since 2000, a remotely controlled model with a 35 foot (11 m) wingspan. This research is focused on establishing the base data concerning the lift, stall and spin characteristics inherent in a Blended Wing Body design.
Progression of aircraft design concepts from conventional airliner (1), blended wing-body (2), hybrid flying wing (3), flying wing (4). Note that the progression does not represent either a chronological or technical progression; the YB-49, representing a true flying wing, actually predates all other depicted aircraft, while the "conventional" Boeing 757 is a relatively new and technologically advanced aircraft.
Potential advantages
Improved fuel economy
Reduced noise impact (if the engines are placed above the wings)
Enormous payload advantages in strategic airlift/air freight[2] and aerial refueling roles
Improved structural weight
Potential disadvantages
Inherent instability (though possible to counter with fly by wire controls)
Layout tends to place cargo and passengers farther from aircraft centerline, exaggerating vertical motions experienced during rolls
No possibility of side windows for passenger compartments
Circular cross sections (as seen in conventional fuselages) are structurally superior shapes for use as pressure vessels in comparison to the rectangular or oval cross section of a blended wing body.
- 相关回复 上下关系8
🙂没多大变化是因为设计新飞机时要考虑机场因素。 njyd 字44 2007-10-26 23:26:03
🙂音速巡航是接近音速,不是超音速 intools 字10847 2007-10-27 01:05:41
🙂我说的是最后那张翼身“翼身合一”。 njyd 字170 2007-10-27 18:02:56
🙂翼身合一的发展
🙂好不容易译了大半,断线!您还是学英文吧,不然提不上高工 intools 字0 2007-10-29 20:44:10
🙂等俺学好也差不多去见上帝了。 njyd 字64 2007-10-29 23:22:46
🙂翼身合一的无人机 波音公司与NASA联合开发的革新型X-48 1 intools 字5478 2007-10-30 19:55:17
🙂谢谢,费心了。 njyd 字106 2007-10-31 01:04:33