Tower Defense Strategy - Chapter 276

“Tower Defense Strategy (!

While outside was arguing about the new space station of Country A, the world dealt with two second-level monsters.

One of them was in Heizhou and was killed by the monster nemesis (Death Scepter No. 1) and a nuclear bomb that was temporarily transported to the local area.

The other one visited Country R, ​​there was nothing to doubt, and was hit by a hydrogen bomb again.

As mentioned earlier, the energy levels in the high-energy regions of nuclear explosions are not much different, but they are only for the same type, and there are still some differences between fusion and fission.

Fission bombs, including plutonium bombs and uranium bombs, can only reach hundreds of thousands of tons in yield. No matter how high the reliability of the chain reaction is, it cannot be controlled.

Fusion is limited by the human technology level, starting with the equivalent of one million tons. In fact, none of them were stuck at one million tons just now. They all started at two to three million.

With such an equivalent, atmospheric particleization is not enough to transfer energy to the outside in a short time, so the energy level in its high-energy region is bound to be higher.

In short, the result is one shot into the soul.

Public opinion has not reported much about this, and no one has made great efforts to develop the hydrogen bomb.

R country is not seen by people; the important point is that the equivalent is too large. If the monster is close to the city, the hydrogen bomb is completely self-destructive. In half of the countries in the world, a two million tons of hydrogen bomb will have no living beings. However, some small areas may even cause large areas of forests to fall and fire in neighboring countries.

In addition, the hydrogen bomb has a threat-the land plate.

The only time in history that the man-made land plate movement that can be observed was caused by a hydrogen bomb dropped by the R alliance.

To put it bluntly, although the vast majority of people trumpet how many times humans can destroy planets, aside from large-yield hydrogen bombs, the only thing human beings can do with nuclear weapons is to eliminate humans themselves, and they cannot cause any damage to the planets, hundreds of thousands. The surface damage caused by a ton-equivalent explosion on land is not as large as the damage caused by a pimple being squeezed to the size of a planet.

The hydrogen bomb is different. The energy level is an order of magnitude larger, and it will indeed affect the movement of the plate. If it is widely used in mass production, it is uncertain when the land plate will crack.

In the history of the planet, the cracking of the terrestrial plates is not a particularly big event. It is just that the fragility of modern human society, being pulled by such a pull, the railway and highway systems collapse, and the result is that the industrial system is immediately on the verge of complete paralysis. .

The good news is that, except for countries R, C, and A, other nuclear-armed countries either have not developed at all, or have completely abandoned their relevant production capabilities, and the threat of hydrogen bombs is very limited.

What country C is pushing at this time is also related to nuclear energy.

Nuclear power thrusters for space!

This is not a new project. As mentioned earlier, nuclear-powered sky survey missiles were built during the R Consortium, and his family also has nuclear-powered military satellites in active service.

A nuclear power engine is neither an electric propulsion system nor a chemical energy application, but a thermal equipment.

The principle is to generate heat through a specially constructed thermonuclear reactor, heat hydrogen (without oxidant), and achieve advancement by means of thermal expansion and contraction.

Country C’s research on the system started late, and it hasn’t been a few years, but she has the miniaturization technology of nuclear submarine reactors and the safest new nuclear power technology. Conversely, it is not too difficult to get this thing.

In the process of demonstrating the future space station program, country C increased its investment in manpower and resources for the system, and experienced some twists and turns. Today is the time to check and accept the initial results.

A grand introduction to the latest “Dry Man” type B nuclear-powered propulsion.

…What about Type A?

Sorry, Type A did not pass the task argument.

Nuclear-powered thrusters are thermally efficient thrusters. The vacuum itself does not conduct heat or absorb heat, which will inevitably produce huge waste heat problems that make people very troublesome. Several previous studies in other countries are also difficult to apply to aerospace engineering because of this problem. .

With the help of the heat recovery power generation system used by the future space station and the new electric thruster used by Yinglong-3, plus some technical design, the B type successfully controlled the high temperature of the outer machine caused by the waste heat of the thruster, so you can give it a try. .

Traditional engines, such as those previously used to capture asteroids and are now used in Yinglong spacecraft and sky-to-space cargo rockets, have a characteristic specific impulse of only 450 seconds, and the theoretical maximum value of the hydrogen-oxygen dual-component-based engine is only 520.

The drought type B has a characteristic ratio of 1025!

It does not require so much fuel to obtain the same ΔV, and the total weight of the fueled engine after fuel weight reduction will decrease, which will further improve its carrying capacity.

This means that with the same fuel moles and load, the Drone B can give about three times the ΔV of the conventional hydrogen-oxygen outer space two-component thruster, not more than twice.

There are two sides to everything, and such a dazzling rivalry can’t come without a price.

Of course, the price is weight.

The Hanyan B is a big guy with a cooling system and nuclear fuel rods. Its empty weight is close to 30 tons. It has a thrust of 260 kN, and the engine has a thrust-to-weight ratio of less than 1, so it cannot be used in the atmosphere.

Such a heavy-duty propeller also means that the lower the freight volume, the greater the proportion of fuel consumed to propel its own weight, and it cannot be used to undertake routine tasks.

After being assembled and inspected by the Future Space Station, the first delivery test of the Drone B will be used to put the cargo on the lunar orbit.

As in the past, in order to avoid unlimited expansion of losses caused by mission failures, this time also carried some lower-cost goods, mainly food, various filters, and aluminum alloy ingots for cold rolling.

The RCS separation and docking integrated system installed between the fuel tank and the cargo tank is responsible for giving the initial thrust and leaving the future space station because the load is too large and the process is very slow.

After flying around the earth ball three times, the mission team was only ten kilometers away from the future space station, and believed that the highest leakage accident safety range was reached. This is because the space facilities have radiation protection capabilities, and everyone is far away when they are placed on the ground. Hiding behind the thickened concrete fortifications.

The drought starts, and the special reaction structure is pushed out of the suppression zone by the mechanical structure, and heating begins.

Because vacuum does not conduct heat, the temperature soon exceeded two thousand.

When the temperature reaches 2300 degrees, the hydrogen fuel injection releases a beautiful slender blue transparent flame at the tail. It is not actually a flame, but the luminous effect of hydrogen turning into high-energy hydrogen particles, which can barely be recognized by the naked eye in the dark space.

After the hydrogen particles are ejected, continue to push the heating group to increase the heat output value to ensure that the heat carried away by the hydrogen particles does not cool the engine.

The task force, which reached 300 tons as a whole, accelerated extremely slowly.

Don’t worry about it for the time being, it will accelerate for a long time.

Returning again after half a day, the cargo has finished accelerating, and the thermonuclear reaction structure returned to the suppression zone. At this time, it was not that there was no heat at all, but it was completely harmless and could be digested by natural heat radiation.

After more than ten hours, he was captured by the moon’s gravity and slowed down.

Because the acceleration was too small, one Homan transfer was not enough. It was corrected to a circular orbit just passing over the polar base, and it was barely repaired to an elliptical orbit around the moon, then turned around, and ignited before entering the planned stable orbit.

At this time, its fuel consumption was less than forty tons!

Using traditional rocket engines for Earth-to-Moon transfers, fuel consumption requires two-thirds or more of the load, and the fluctuations depend on the selected window timing and target trajectory.

Next, Homo sapiens and Ying Long 1 who stayed in the Moon Palace will take over.

Yinglong No. 1 chooses the right time to take off from the base and pursues the task force from below.

After catching up, do not rush to docking, first fly out to check all aspects of the dry shin thruster, confirm that there are no problems or malfunctions, and then the experiment can be declared successful.

However, the dry cargo team had to stop on the lunar orbit for the time being, because the cargo was transported too much, even if it was landed in split-throw, it would still need to be delivered to the surface in four batches.

This is also the greatest significance of the drought to the sky-to suppress the earth-moon transfer loss to the limit, in order to increase the support for the construction of the lunar surface base.

After the inspection is completed, the carrying section is separated from the loading section, and the second stage of the experiment is carried out using the return track.

In this phase, the super maneuver mode will be tested, and the temperature of the fuel rod heater will be increased as close as possible to the experimental data on the ground.

The nuclear-powered engine will spray hydrogen gas. If the particle jet is blocked, it will also block the heat radiation simulation. Therefore, it is impossible to do a full vacuum experiment on the surface. The heat treatment situation is somewhat different from that of space, although the vacuum environment results are obtained through supercomputers. , But whether it can reach the expected value depends on the scene.

In this drought, the temperature jumped directly to 2400 degrees, hydrogen gas was introduced to start the propulsion, and under real-time monitoring on the ground, it continued to increase in units of 20 degrees.

The process is quite technically difficult, because after no load, its acceleration is similar to that of a normal orbital engine. It can be said that if there is no supercomputing support, one inadvertently will fly into deep space.

In a short ignition time of tens of seconds, the temperature jumped up to four gears, and finally stayed at 2480 degrees. When the flame is turned off, the temperature of the dry cooling system has also been heated to 800 degrees, and it continues to rise to 860 degrees after the flame is turned off. .

The maximum specific impulse measured in this experiment has reached 1180 seconds!

The specific impulse figures are very explosive, but the defects are also very obvious.

Two hours after the flame was turned off, the liquid hydrogen tank in front was separated by a heat insulation ring. The outer shell was heated to more than 300 degrees by thermal radiation. Most of the temperature was brought by light, which was also dozens of times higher than normal. If this situation is not taken into account in the design, and the heat insulation is better than before, this temperature is already quite dangerous for the liquid hydrogen container.

Will normal mode not heat the front?

Yes, but in the normal mode, the engine cooling shell is always kept below 700 degrees, and the heat radiation value to the front equipment is relatively limited, and the influence of the sun is not comparable.

Twenty hours later, the Hanyan returned to the orbit of the earth ball and caught up with the future space station through several orbit adjustments ~www.mtlnovel.com~ was caught by the robotic arm, and the third phase of the experiment was started.

Since it was carried out while being directly caught by the future space station, it has already shown that the third stage is the least dangerous.

This stage is called the two-stage power mode, and the temperature of the fuel rod heater is controlled below two thousand degrees.

The purpose of this ignition is to help the future space station to fine-tune the orbit and save a little fuel.

The specific impulse measured in the test plummeted to 850, and the temperature of the cooling shell never exceeded five hundred degrees.

In fact, this is a test of the feasibility of manned spacecraft in the future, and the results seem to be OK, but we still need to continue to improve the waste heat treatment capacity.

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