Genius is just the threshold for me!

Chapter 103 Missiles on the Type 055 Destroyer?

Are missiles from the 701 Institute and AVIC being deployed on ships? Or are they fourth-generation large warships?

Upon hearing this, Lin Dong's expression shifted slightly, and he opened the file folder and took out the documents inside.

After glancing at the inquiry letter, Lin Dong put it aside and turned to the remaining instructions regarding ship-launched missiles.

Code name: Longsword

Specifications: Supersonic cruise missile, multi-system guidance system, 500 kg-class warhead, design length 8996 mm, diameter 780 mm, weight 4487 kg.

The requirements include a cruise range greater than 4000 kilometers, a high-altitude cruise speed of Mach 4 to 5, a terminal penetration speed of Mach 7, a maximum cruise altitude of >35000 meters, and the ability to perform tactical flight to evade radar at a low-altitude subsonic speed of 60 meters...

really!

It's this—the Type 055 destroyer!

When Lin Dong saw the code name "Longsword," a look of realization flashed in his eyes.

This period required the deployment of the Longsword missile on a ship, a fourth-generation large warship, which was also a top-secret project.

Only the Type 055 destroyer, known as a super missile arsenal, does not need other escort ships. It can sail out to sea on its own, and its firepower configuration is enough to wipe out a small or medium-sized country's super destroyer.

"This missile is very difficult to develop."

Lin Dong carefully reviewed the performance requirements, tapped the paper twice with his finger, and frowned slightly.

The maximum weight was limited, and then the 500 kg warhead was retained.

That leaves less than 4 tons of spare capacity for the entire missile's structure, engine, fuel, and other control and guidance systems.

With less than 4 tons of spare space, they had to cram so much stuff in.

It must also be able to cruise at Mach 4 to 5, penetrate defenses at Mach 7, cruise at an altitude of 35,000 meters, conduct tactical cruises at a low altitude of 60 meters to avoid radar, and have a range of more than 4000 kilometers...

If Gian were here, he would probably shout that this is making things difficult for him.

"Who provided these requirements?"

Lin Dong put down the documents and looked at Wang Xingguo in the driver's seat: "Don't they know that low-altitude subsonic tactical cruise and high-altitude cruise at Mach 4 to 5 are two directly conflicting parameters?"

Different engines are suited for different flight speeds.

In other words, the comfort zone is different for each engine.

Low-altitude subsonic cruise and low-speed cruising require turbofan engines, and turbofan efficiency drops sharply once the speed exceeds Mach 2.

Cruising at high altitudes at Mach 4 to 5 requires the use of a ramjet engine. However, when the speed exceeds Mach 5 or falls below Mach 3.5, the ramjet efficiency drops sharply or even stalls.

As for the Mach 2 and Mach 3.5 range, this is the sweet spot for turbojet engines.

For speeds of Mach 5 or 6 and above, either a rocket engine or a scramjet engine is needed.

"The variable ramjet engine of the Hot Spicy..." Wang Xingguo glanced at Lin Dong and mentioned it softly.

"Uh... okay."

Lin Dong was speechless.

The relationship issue is a mess I created myself.

When he was working on the Hot 2 engine, he considered fuel efficiency at low and medium speeds, but also wanted to pursue high speeds.

After two and a half days of deliberation, it was decided to adopt the variable cycle stamping engine of the TBCC mode, which had been developed ten years later but was not yet perfected and widely used. It took another two and a half years to complete the design.

At low speeds, it operates in turbofan mode; at medium speeds, it shuts off the intake fan and compressor, becoming a turbojet engine; and at high speeds, the turbine can be shut off as well, switching to ramjet mode…

At this stage, the world only has variable cycle engines.

That is the switching between turbofan and turbojet modes to achieve economical flight in the subsonic, transonic, and mesonic range.

As for the TBCC variable ram cycle combination engine, there is only one in the world at present, and it is a miniaturized engine.

"It can be put on the ship, but the design needs to be modified to reduce the diameter and adopt a four-engine joint design."

"In addition, for low-altitude tactical cruise and high-altitude penetration cruise, the cruise mode must be selected at the time of launch. Switching midway will result in a loss of 40% of the total range."

After carefully calculating in his mind for a while, Lin Dong took a deep breath and said seriously, "Low-altitude subsonic cruise, the estimated range can reach 5200 kilometers."

The high-altitude cruise range is only 3800 kilometers. To increase the range, it is necessary to use a multi-stage design with rocket engines.

By using the rocket engine for initial boost, the missile's speed can be rapidly increased to Mach 2, while simultaneously rising to an altitude of over 10,000 meters.

Then the engine takes over the subsequent cruise, so the range of this high-altitude penetration cruise is estimated to be 5800 kilometers...

Although Wang Xingguo said that there was no need to push it, Lin Dong never thought of pushing it after seeing that it was a Type 055 destroyer being put on board.

After all, who wouldn't want to realize the dream of deploying the Type 055 destroyer?

In his memory, even if the Type 055 destroyer is not launched until 2017, its shipborne cruise missile will still be the Changjian-10, a subsonic cruise missile improved from the Dongfeng-10, with a range of only 1000 kilometers.

Although the Type 055 destroyer launched at that time was equipped with YJ-20 hypersonic anti-ship missiles, with a maximum missile load of more than 400, it had a strong deterrent effect on the naval fleet.

However, the lack of cruise missiles reduces the deterrent capability of the Type 055 destroyer against land by at least three levels.

The performance parameters required for this set of specifications, apart from the absurd requirement of needing both high-speed penetration cruise and low-altitude tactical cruise, are also included.

The remaining parameters and performance are clearly comparable to those of the Changjian-100 supersonic cruise missile, which was unveiled at the 2019 National Day military parade.

So it's quite obvious.

In the previous life, the development of this missile encountered problems, and the progress was seriously delayed by two years, completely failing to keep up with the progress of the Type 055 destroyer and failing to be launched along with the Type 055 destroyer.

If this missile can be launched into the sea along with it, then the Type 055 destroyer will not only be a maritime tyrant, but a global tyrant, able to roam freely everywhere.

"Four engines in tandem? SpaceX's Falcon 9's engine tandem launch system?"

Wang Xingguo frowned: "Wouldn't such a missile system be too complex? Wouldn't the engineering control be too difficult? And is this approach really feasible?"

As the "001" of Chengdu Aircraft Industry Group and a leading figure in the military industry, Wang Xingguo pays attention to any technology related to the military industry worldwide.

In 2010, SpaceX's Falcon 9 completed its maiden flight.

The first stage uses nine Greyback Falcon liquid oxygen-kerosene engines in tandem, pioneering the use of multiple engines in a single missile body. At the same time, it was announced that the development of high-thrust engines would be temporarily suspended, focusing on a solution of medium and small thrust engines combined with tandem technology.

However, at this time, apart from Musk and the SpaceX team, no one in the world was optimistic about this approach.

One is the engine-integrated technology, which is only suitable for missiles and rockets, and is completely unsuitable for aircraft such as fighter jets.

For major countries, even if they achieve a breakthrough in developing this technology, it will not benefit other fields and the cost-effectiveness is very low.

Another is multi-engine synergy. With each additional engine, the complexity and control difficulty of the system increase dramatically.

When a dozen or twenty engines are running in tandem, the engineering control involved is no less difficult than directly developing a high-thrust engine.

Even in public interviews after his death, Musk frankly admitted that he was unsure of himself at the time and had prepared for countless failures.

Given the situation in the US at the time, compared to researching high-thrust engine solutions, researching multi-engine tandem technology was the only feasible option.

If we don't move forward, the company will collapse. We have no choice but to take it one step at a time.

"It's difficult, but I can solve it."

Lin Dong tapped his head lightly and objectively commented, "As for whether this engine co-generation route is feasible, the key is to look at the options available and whether it is suitable for the industry chain."

For SpaceX, the hollowing out of American manufacturing means that even if Musk wants to develop a single high-thrust engine, he cannot find the corresponding industrial chain to support it.

By focusing on small and medium-sized engines and then integrating thrust using multi-engine synergy technology, solving software and engineering control challenges is simpler than addressing supply chain issues.

For them, it wasn't a question of whether the route was feasible, but a survival issue they had no choice but to address.

But for us, we have a complete industrial chain. We can take the high-thrust engine route, or we can take the multi-engine route. It has never been a must-have option...

Multi-engine tandem development only requires solving software and control level problems, without needing to solve a series of large-scale challenges.

This was also relatively simple for Lin Dong.

After all, the perception ability of the soul's vision can detect defects in software and control, and imperfect designs.

The real problem is that researching multi-engine solutions is not cost-effective.

This type of technology is only suitable for missiles with a straight cylindrical shape, and is completely unsuitable for future aerospace aircraft and other aircraft.

This is also why China has never pursued a multi-engine strategy, and why Lin Dong didn't pay attention to this aspect.

After all, private companies like SpaceX only need to focus on a single business, as long as the technology passes the test and can be operated and make money.

National strategies consider overall planning, starting from specific points and expanding outwards, and from one area to another. These isolated projects are never given high priority.

but.

Since the Changjian missile is going to be deployed on the Type 055 destroyer, Lin Dong doesn't mind taking some time to work on it and get the fully-fledged Type 055 destroyer out ahead of schedule.

"Now there is a problem."

Lin Dong pointed to the missile performance requirements on the document, then looked up at Wang Xingguo: "I can handle the engine for this Longsword missile, but this project... how do we integrate it?"