歼-20战斗机是中国航空工业有史以来第一次赶上世界先进水平,飞机具备先进的隐身性能,超音速巡航,高机动,能携带多发导弹进行远程攻击,多次演习中轻松打破三代机和预警机的封锁,10分钟内轻松结束战斗,让中国空军直接感受到:隐身飞机原来这么强悍!

The J-20 is the first time in the history of China's aviation industry to catch up with the world's advanced level, the aircraft has advanced stealth performance, supersonic cruise, high mobility, can carry multiple missiles for long-range attacks, many drills easily broke the blockade of three generations of aircraft and early warning aircraft, within 10 minutes to easily end the battle, let the Chinese air force directly feel: stealthy aircraft is so strong!

  歼-20受到了中国军方和军迷的高度赞扬,这款飞机现阶段并不是完全体,飞机存在两个重大隐患,尾部隐身不佳,红外隐身不够,其实都来源于一个重要部件:发动机,由于我国航空发动机基础薄弱,加力推力16-17吨推重比为10的四代军用发动机涡扇-15一直难产,所以空军不得不使用进口发动机,最近歼-20战斗机有了一个巨大的突破:发动机采用了锯齿设计喷口,这将是歼-20开始解决短板的开始。

The J-20 is highly praised by the Chinese military and military fans. The aircraft is not completely intact at this stage. There are two major hidden dangers in the aircraft, the tail stealth is not good, and the infrared stealth is not enough, both of which are derived from an important component: the engine, the four generations of military engine turbofans with a low base of 16-17 tons of thrust force and a 10 push weight ratio, have been difficult to produce, so the air force has to use imported engines. Recently, the J-20 fighter has a huge breakthrough: the engine has adopted a serrated nozzle, which will be the beginning of the J-20.

  这个锯齿发动机是中国太行发动机改进型,加力推力在14吨,这比歼-20试飞时期使用的俄制发动机推力相当,而且最重要的是,这是中国第一款带隐身功能发动机,虽然推力并不足够,却开始证明,中国歼-20正在一步步走向完美,发动机推力不足和隐身缺陷这两短板,逐步壮大稳固。

The sawtooth engine is an improved type of china's taihang engine with 14 tons of thrust, which is comparable to the russian-made engine used during the j-20 test, and most importantly, china's first stealthy engine, which, though not strong enough, is beginning to prove that china's j-20 is moving towards perfection, with two short plates that have not enough thrust and a hidden defect.

  这款发动机最大的特色是,采用了锯齿尾喷口,这种设计有两方面的好处,一方面是可以增加高温喷流的接触周长,快速降低喷流温度,美国F-35战斗机也采用这种设计,外加大涵道比设计,可以降低80%-90%的红外辐射,极度消弱敌人红外探测器的探测具有,极大提高敌人红外导弹攻击下的生存力。

The biggest feature of the engine is the introduction of a serrated nozzle, which has two advantages: it can increase the contact circumference of the high-temperature jet and reduce the jet temperature quickly, and the U.S. F-35 fighter jet also uses this design, which can reduce the infrared radiation by 80% to 90% by using the culvert ratio design.

  另外一个,这种锯齿喷口,也消除了早期发动机的喷口叶片镜面反射,这是歼-20战斗机最大的隐身短板,未经处理过,效果和三代机类似,现阶段的歼-20战斗机尾部是完全不隐身的,这个弱点给飞行员作战带来很多麻烦,需要采取特殊战术来避免暴露。

On the other hand, the serrated nozzle also eliminates the mirror reflection of the blades of the early engine, which is the largest stealth short plate of the J-20 fighter, which is untreated and has a similar effect to the three-generation aircraft, and the current stage of the J-20 rear is completely invisible, a weakness that causes a lot of trouble for pilots to fight and requires special tactics to avoid exposure.

  现在还有一个问题,发动机隐身除了喷口鱼鳞片镜面反射之外,发动机尾部的加力燃烧室和涡轮叶片,也和发动机壳体形成多层角反射,类似龙波透镜原理,将尾部入射电磁波原路返回,所以也必须进行特殊改造,F-35战斗机则完全采用隐身格栅完全遮挡,歼-20的新发动机,不知道有没有采用类似设计。

There is also a problem that engine stealth, in addition to the mirror reflection of the spout fish scales, the combustion chamber and turbine blades at the rear of the engine also form a multi-layer angle reflection with the engine housing, similar to the principle of the long-wave lens, which returns the incident electromagnetic wave of the tail to the original way, so special modifications must be made, and the F-35 fighter completely uses the stealth grille to completely block the new engine of the J-20, not knowing whether similar designs have been adopted.

  假如就对喷口鱼鳞片采用锯齿设计,其实对雷达隐身用处不大,仅仅对红外隐身有好处,假如要完善尾部雷达隐身,则需要对发动机内部结构进行大手术,或许这发动机最大看点就是隐身设计,可以为涡扇-15提前预热探索,预先验证发动机的红外和雷达设计,这也是降低涡扇-15发动机风险,采取的稳妥措施。

If the nozzle scale is designed with sawtooth, it is not useful for radar stealth, but only for infrared stealth. If the rear radar stealth is to be improved, the internal structure of the engine needs to be operated on. Perhaps the biggest point of view of the engine is the stealth design, which can be preheated for turbofan-15 to verify the engine infrared and radar design in advance, which is also a safe measure to reduce the risk of turbofan-15 engine.

  2017年歼-20战斗机开始交付空军,这3年时间内,我们不断前进,最早采用外国发动机,后来使用国产发动机,现在搞隐身设计,虽然还没有得到完美版本的涡扇-15,但是越来越快,也越来越近了。

In 2017, the j-20 fighters began to deliver to the air force, and over the past three years, we have been moving forward, first using foreign engines, later using domestic engines, now engaged in stealth design, although not yet get the perfect version of the turbofan-15, but faster and closer.


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