Speaking of which, Wang Zhengguo and Tu Zhenying, who can definitely be regarded as a typical example of actively responding to the call for national family planning, after high-intensity work on the wedding day, they have not been able to slow down for many days, and they have been ridiculed by many so-called people who have come over as "the king will not be early from now on".

In order to clarify the facts, just after 86 years, Wang Zhengguo finally has to stand up and devote himself to work.

In addition to solving Wang Zhengguo's personal problems, Comrade Wang's return to China this time was also to complete the technical docking between the South African plan and the domestic No. 10 interception type.

In the end, Mr. Wen took Lao Wang into the Southwest Motivation Company, and even flickered and threatened, demanding that he must do his best to complete the development of the engine as soon as possible.

Fortunately, the progress of Southwest Motor is not slow, using parts sent from the United Kingdom, the factory has been under the guidance of the engineering personnel sent by Rolls-Royce, the final assembly of five engines has been completed, and the test bench has already been running at full capacity for almost three months, and the test data obtained is very gratifying.

At sea level, the maximum afterfuel thrust can reach 12.2 tons, and this is already up to the level of the third-generation high-thrust turbofan engine.

The goal of Qingcheng engine has always been clear, that is, to strive to get closer to the F-110, and now in terms of thrust and fuel consumption, it has actually reached the same level.

The life data is a great surprise, mainly because the engine is designed by Rolls-Royce himself, which makes the domestic aero engine practitioners jaw-dropping data, the first overhaul time is 900 hours, and the total life is 2700.

Just on the upper plane, after the Spey 202 engine was localized, that is, the ill-fated turbofan 9, the military was very satisfied with its life.

The reason for this is that the actual turbofan 9 technology was introduced from Rolls-Royce in the seventies, when the first overhaul life of the Spey 202 engine was only 850, and the total life was only 2450.

In fact, the life data of the turbofan 9 engine in the plane is not the ultimate version of the Spey 202 in Rolls-Royce's hand, and in this way, the military of the Republic can be happy about this, not to mention the powerful life data of the current Qingcheng engine.

"How, according to the life of this engine, our new aircraft will only need to purchase two engines in the whole life cycle from delivery to final retirement, which is worry-free!"

Lao Wang had calculations when designing the aircraft, and he roughly set a service life of 5,000 hours for the airframe, which seems to be just right to match the engine life.

When Mr. Wen saw the life data of the Qingcheng engine, he suddenly remembered another engine in his heart: turbojet 13, the life of that thing.....

Can it reach half of Qingcheng's life expectancy data?

According to the urine of the Soviet engine, I am afraid that the domestic imitation turbojet 13 is not half of Qingcheng in terms of life, and if the total life can break through the four-digit mark, this can already be regarded as the longevity of the Soviet military engine.

Gently put the engine test data provided by Southwest Motor on the table, Chief Wen had already made up his mind in his heart, just for the service life, in fact, it was enough for the military to shake the previous engine selection, not to mention that this Qingcheng engine has another advantage.

"That's right, the Qingcheng engine is definitely the best product we can get at the moment, but I think the biggest advantage of this engine is not in the life, fuel consumption, its ultra-high surge margin is what we should pay attention to in the single engine. ”

The number of compressor stages of the Qingcheng engine is more than that of other standard third-generation big pushes, which has the disadvantage that it will bring more weight and volume burden to the engine.

But while everything has a downside, there is naturally a good side, when the Spey engine was designed in the early years, because the efficiency of the single-stage compressor was not high, more compressor stages were needed to meet the total boost ratio requirements.

In the 80s, supercomputers were gradually popularized in the field of industrial design, fluid mechanics was rapidly developed, and the blade shape of single-stage compressors was optimized, and the efficiency was also improved.

Under the same requirement of the total booster ratio of the compressor, for military engines that are quite sensitive to weight and volume, of course, the choice is to reduce the number of compressor stages.

But if you look closely, you will find that even after 2000, those aero engines designed specifically for the civilian field did not blindly reduce the number of compressor stages in the design of compressor stages as military engines.

First of all, the V2500 with 10-14 tons of thrust, this guy uses a 10-stage high-pressure compressor, and the 7-10 ton BR700, which also has a 10-stage high-pressure compressor.

Comparing the various military engines newly developed in the eighties, EJ200 is a 5-stage high-pressure compressor, M88 is a 6-stage high-pressure compressor, and F-119 is also a 6-stage, and the gap between the two is indeed too big.

In the same era, why is there such a big difference in the number of engine compressor stages between military and civilian use?

In fact, it is very simple, military engines are sensitive to volume and weight, is it that civilian engines do not pay attention to this aspect at all, I am afraid it is not right, in the final analysis, civilian engines still maintain more compressor stages, which must be affected by reasons.

In fact, the above is very simple to study, the first priority of civil engines is safety, cost, and the advantage of maintaining more compressor stage design is that it can suppress engine surge.

Of course, the benefits of a multi-stage high-pressure compressor design certainly don't stop there.

Under the same basic conditions, it can ensure that the high-pressure compressor has a higher total compression ratio, so that the high-pressure turbine can output more high-temperature gas at lower temperatures, which is why the total temperature of the high-pressure turbine of the Qingcheng engine is lower than that of military engines such as the F-100/F110, but it can still reach 12 tons of thrust.

As for the low fuel consumption of the Qingcheng engine, in fact, the reason can be found here, you heat the high-temperature turbine, of course, the higher the temperature requirements, the more fuel will be consumed, which no one can change the law of conservation of energy.

In fact, the importance of the surge margin index for military engines is also not low, but military engines have air intakes, and designers can achieve the surge margin index by optimizing the propulsion system of the entire aircraft, while civilian engines cannot do this.

Therefore, in the end, the military engine embarked on the engine thrust route of constantly cutting the compressor stage and frantically increasing the total turbine temperature, which is actually caused by the particularity of the military aircraft.

All in all, whether it is more compressor stages + low total turbine temperature, or fewer compressor stages + high turbine total temperature, both of which can actually achieve the needs of engine propulsion.

The United States, Britain and France have accumulated abundant technology in the field of aero engines, and they can develop more suitable technical routes according to their own needs.

But the republic is not good, and the southwest motive is even less qualified to pick the fat and the thin, in this year, it would be good to have an engine.

Qingcheng continues from Spey and TF-41 engines, which are originally to take more compressor stages + low turbine total temperature route, which is rooted in the deepest genes of the series of engine families, and even the magic change cannot erase it.