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And it is not clear that generations of machine within the size and distribution of the weapon bays, but there are so for organism,[link widoczny dla zalogowanych], inside machine weapon bays space should be comparative plenty. F - 22 bending inlet,[link widoczny dla zalogowanych], but also the chief to F - 22 considerably shorter, it might be because American inlet design level and engine length relationship, also may be F - 22, the fixed inlet, and generations using but DiaoJin airway.
Generations adopted DSI (no attached supersonic inlet), layer partition with 3d complex curved surface of convex curved surface (bulge shape, for compressed air intake of attached layer), then use dividing head pressure gradient top to the intake of the two horns bleeder. But the fourth DSI has three special place, one is asymmetric, convex curved surface position slant on, unlike conventional DSI symmetrical design,[link widoczny dla zalogowanych], which may be caused by the pics are not clear illusion, 2 it is inlet side lips mouth with them, the world's known DSI views, Three generations of the inlet is is adjustable, this also is the fifth generation fighter only by using DiaoJin intake.
Must have been DSI is one of the world's most experienced aircraft company, designs the three frame XiaoLong DSI fighter: 04, annihilates - BNCT, four generations. In contrast, lockheed Martin only F - 35, studied machine cannot calculate. Been in generations used on such a special DSI is reasonable.
The intake design needs to do three things:
1,[link widoczny dla zalogowanych], separation attached facing, ensure clean air into the inlet
2, in high Angle of also ensure normal intake
3, in the inlet airflow supersonic flight subsonic, and slowed to increase pressure, or the so-called the total pressure recovery
Generations DSI just in these three respects are using minimum compromise did. DSI namely originally used to separate attached surface layer, the attached layer DSI separation efficiency, small resistance, the total pressure recovery is good, but only for a limited DSI speedrange optimization, difficult to do to great speed range are highly effective. In addition, DSI convex surface designs would rather complicated,[link widoczny dla zalogowanych], you need to consider the three-dimensional flow field and pressure distribution. In order to stealth, generations head is diamond section, inlet is like a v-shaped as from side to side tilt, in high Angle obscene games more complicated. In order to improve the high Angle of inlet air "catch" effect, inlet like F - 15 at them as with a little bit. In order not to give DSI brings designers too big bothering them no F - 15 so big. But v-shaped nose of the lower fuselage pre compression ability inadequacy before the inlet them insufficient be short of regret. In addition, because of the intake at them, lip position after depend, so convex curved surface position, and convex surface partial dividing caused two pie "beard" under half of the position just to.
Fourth, all stealth fighter planes are all before the fixed inlet. Fixed the intake of simple structure, no moving parts, radar reflective characteristic small. From F - 22 beginning, fixed inlet almost become stealth fighter intrinsic features, F - 35, T - 50 are fixed inlet. But fixed inlet only smaller Mach number range optimization, F - 16 with fixed after the intake, although esteem than F - 104 increased by 40 percent, but the maximum speed quite, partly because it because F - 16 fixed inlet is for transonic combat not top speed and optimization, and F - 104 of the inlet is by half conical adjustable, so in greater speed range maintain optimal. In supersonic flight, the intake of lips mouth also causes shock, shock wave fronts like gas shade, air through shock frontal gets slowing down. Can DiaoJin intake can effectively control under different speeds shock wave shape and position, make the airflow achieve positive for engine optimal speed, the highest pressure. Not only DiaoJin intake in design speed do this, in other velocity, either airflow velocity is still too high, engine previous level within less than compressor instead of compressor role, but become windmill, make airflow slowed to subsonic, Or speed too low, greatly increases the compressor burden.
F22 fighters
F - 22 using Calais, inlet, also called double crosswise double compression surface inlet, or diagonal cutting lozenge inlet, different statements,[link widoczny dla zalogowanych], all is a meaning. This design than DSI supersonic performance is good,[link widoczny dla zalogowanych], adapt to a broader range of speed, but is still fixed inlet, eventually escapes fixed inlet restrictions. Fortunately F - 22 have two abnormal condition of the engine, Seattle cruise: no problem. T - 50 of supersonic cruise performance now not clear, T - 50 of inlet and F - 22 are different, but the principle is similar. F - 35 DSI, only by an engine, although thrust abnormal condition, or inadequate, highest speed, super tour will only m1.6-m7 hands-free. Generations to do super tour, but China no F - 22 this abnormal condition of the engine, only with DiaoJin intake to help, reaching enough super tour performance. Generations of inlet upper lip can prolapse, like F - 15 are the same, and that is can DiaoJin intake. And F - 15 different is, F - 15 can DiaoJin intake is exposed to, and four generations of DiaoJin intake can be covered in the inlet structure in daiwan. Do this of course is from fourteen stealth consideration, but may cause intake labiali mouth thicker, resistance increased problem. Engineering design is supposed to gain and loss balance process, as long as the final result to greater than lose, it was worth it.
But generations of inlet upper lip prolapse how to avoid and fight the bulge DSI, this is an interesting question that need to be more detail pictures can remover. The upper lip and fixed shell activities between inevitable clearance, how to avoid sundry and dust tailed in, cause adjustable upper lip movements suffocate suffocate, this also is a concrete engineering problems. Generations of inlet is DSI,[link widoczny dla zalogowanych], Calais stromstad and F - 15 such adjustable -200 shape unit, it also gives the generations positive big frog similar traits.