Chapter 126： Air-cooled liquid-cooled

PS: In this chapter, the hero of East China is sick again. I originally planned to introduce it a bit, but the chapter came out. Alas, the old army fan is not good. If you feel boring, please ignore this chapter.

Air cooling and liquid cooling are different types of engine cooling. As the name suggests, air cooling uses air cooling, while liquid cooling uses coolant, which is generally water now.

The original engines were all air-cooled. This engine has some advantages.

For example, light weight, compared with liquid-cooled, less water jacket, less heat dissipation water tank, as long as the radiator is arranged outside the cylinder, it is much lighter than liquid-cooled.

At the same time, because the liquid cooling system is omitted, the whole engine is less troublesome, and the overall reliability is improved.

At the same time, in an air battle, the opponent’s one shot killed the cooling water tank, and the liquid-cooled engine was scrapped, and the cylinders of the air-cooled engine were scattered on a circumferential plane, which reduced the possibility of being caught in a pot.

However, the current mainstream is liquid cooling, because air cooling has some congenital defects.

The first biggest flaw is the cross-sectional area.

The plane is to fly. The larger the windward area, the greater the air resistance. The liquid-cooled engine has a small cross-sectional area, while the air-cooled engine needs to arrange multiple cylinders in a plane, which has a large cross-sectional area. , Which finally causes the air resistance of the entire aircraft to increase.

At the same time, the arrangement of air-cooled aviation engines will cause more obvious and violent vibrations than liquid-cooled aviation engines. Such vibrations will undoubtedly affect the aircraft.

Furthermore, since air-cooled engines use heat sinks or directly expose parts to the air for cooling, heat sinks cannot be increased without limit. In this way, in terms of heat dissipation, air cooling is worse.

In the history of aircraft research and development, air-cooled engines often have headaches for heat dissipation, which may cause the engine to catch fire, while liquid-cooled engines do not have this concern.

In fact, there is no final conclusion whether liquid cooling is better or air cooling. During World War II, many ace fighters were born, some of which were air-cooled and liquid-cooled.

For example, the zero-war Nakajima "Sakae" 21 star-shaped air-cooled piston engine and the Cat’s R1830 star-shaped air-cooled piston engine are the pinnacle of air cooling.

The "Merlin" 12V liquid-cooled piston engine of Spitfire I, the DB601 liquid-cooled piston engine of BF109, the Allison V1710-33 liquid-cooled piston engine of 40, and the Mikulin AM-35 liquid-cooled piston engine of IL-2, Both are excellent liquid-cooled engines.

Whether air-cooled or liquid-cooled, as long as you can win, it is a good plane!

From the actual point of view in Germany, although the DB601 is already very good, the output is limited, and now Goring has put on a posture, it is obvious that even if he quarrels, he will definitely not give.

Simply, start anew!

At the same time, from Cyric's point of view, it is more appropriate for the Navy to use air-cooled engines. For example, look at the United States on the other side of the ocean. The U.S. Army Air Force uses liquid-cooled engines, while the Navy is all air-cooled.

Why? Trouble maintenance, poor anti-strike ability!

Liquid-cooled engines have coolant. If the weather is cold, when starting the engine, you need to add boiling water in advance to warm up the engine. Once the water leaks, it is even more troublesome. Therefore, in cold areas, liquid-cooled engines It's hard to serve.

When Germany invaded the Soviet Union, the dispatch efficiency of BF109 was less than a quarter of that of FW190. That's why.

And the air cooling is not so troublesome, you can directly ignite at any time! On the aircraft carrier, far from the mainland, there is not much fresh water on the warship. If you have to prepare for the aircraft, it will be a nightmare.

Moreover, the air-cooled has a strong anti-strike ability. In battle, once a cylinder is hit, it may fly back. If it is liquid-cooled, you have to parachute.

On land, parachuting and then on the ground, on the sea, jumping into the sea, it is similar to suicide.

Although the windward area of ​​air-cooling is large, it can be compensated by superb design and can be reduced. For this, Cyreck trusts Fokker-Wulff.

Because this is what happened in history, and the final FW190 is even more advanced than the BF109!

Historically, Germany surveyed the world and found that only one BF109 hit the world, which was quite dangerous.

Because other air force powers have at least two modern fighters that are about to be put into production and service, in 37 years of history, Germany has proposed technical specifications for new fighters.

By the spring of 38, these technical specifications were sent to major manufacturers, hoping that among them, advanced fighters would be born.

In accordance with the plan, Fokker designed a compact fighter powered by a star-shaped air-cooled engine.

However, at the time, the German executives were all proponents of in-line water-cooled engines and did not approve of Fokker’s new fighter plan Therefore, this plan did not enter Goering's eyes at all.

But then, the Heinkel He100 and He112, which Goering had high hopes for, failed to develop. At the same time, although the Junkers in Dessau and Daimler-Benz in Stuttgart are running at full capacity, they cannot provide them in the short term. A sufficient number of liquid-cooled engines required for aircraft production.

This resulted in the Henkel company having to significantly reduce and eventually stopped the production of the He111P bomber with the DB601 engine, instead focusing on the production of the He111H powered by the Junkers Jumo211 engine.

As a result, just like BF109's willows, FW190 finally re-entered the German Air Force's eyes.

Fokker is also quite competitive. The aircraft was finally successfully developed, and it was even better than the BF109!

As for the problem of large windward area, it was also cleverly solved by the designer. The engine cooling air intake was designed in the engine hood and covered by a special ducted propeller hub fairing. This design increased The cooling air flow rate is reduced, and the air resistance is reduced.

And now, because of Cyric's crossing, history has changed again. This fighter that almost died in history will enter active service sooner!

"I suggest that the navy should raise funds by itself and select a manufacturer to use BMW's air-cooled engine to develop a carrier-based aircraft suitable for the navy." Cyric said: "I personally suggest that you can ask Fokker To design, the most basic indicator is to fully surpass BF109."

Goring opened his mouth wide. Although he didn't say it, his eyes still betrayed him. In that way, he was clearly saying, Cyric, are you bragging?