Finally, I have time to write something longer, first of all, to talk about the 155mm ram shell that Boeing and NAMMO recently tested. Everyone should know that the ram shell is to extend the range, but the principle of this ram engine may be a little different from what you know.
First of all, there are two kinds of Sisi, and the stamping is also divided into two kinds of liquid and solid, which everyone should know here. But what you won't know is that solids are also divided into two types. The more well-known solid-state type is the Ducted Rocket of the Meteor Missile, whose solid fuel slowly "burns" to produce oil and gas, which is poured into the combustion chamber and mixed with air to burn.
Another kind of solid state stamping is actually called "solid fuel stamping" (SFRJ, Solid Fuel RamJet), that is to say, it is the solid state stamping of the authentic ancestors. Its principle is quite similar to that of solid fuel rockets, solid fuel is placed in the combustion chamber, the center to dig a hole to open up to form a combustion chamber, the difference is that the front opening introduces air, pours into the middle channel for combustion, and spews gas from the rear. Therefore, like a solid-fuel rocket, it burns out from the middle, and the more it burns, the larger the channel, until it burns out.
So why hasn't this solid-state stamping become popular? The reason is that like solid rockets, the throttle is not adjustable. Most missiles have multiple flight modes due to mission requirements, requiring throttle control to achieve optimal range. The advantage of liquid stamping and catheter rockets is that the fuel tank is separated from the combustion chamber, and the transmission in the middle has an additional "throttle" to control the fuel flow. Solid-state stamping, like solid-state rockets, burns autonomously until it burns out once ignited.
Seeing this, did everyone suddenly realize: Then the solid stamping is used to make cannonballs, is not there such a disadvantage? Yes, shells only fly in parabolas, and you can extend the range and feel great. And the structure of the solid-state stamping is half the same as that of the solid-state rocket, so it can be thought of as a rocket booster with an intake hole in the front. Solid stamped fuel is also easy to transport and preserve, and the composition does not contain oxidants, which is not safer than solid rockets. Finally, don't underestimate solid stamped fuel, its energy density is higher than liquid fuel! The reason is that solid fuels can be added with metal particles to increase energy.
Therefore, in addition to using solid stamping as a howitzer, some people have also thought of using it as an anti-aircraft shell, and hitting an aircraft should have a long range. But the reason why no one has really done it is of course too expensive, the traditional shells are all cabbage prices, is it crazy to take the elaborate air intake holes? However, from time to time, GPS guidance technology has greatly increased the power of long-range artillery shells, and many militaries have been able to accept a hundred thousand dollars of Excalibur shells, and it is naturally acceptable to double the cost of doubling the range.
Finally, to mention NAMMO, this is not a small Norwegian company, it solved some high-energy fuel production problems earlier than the American manufacturers in the 2010s, so it became a rocket manufacturer of AMRAAM (after C5) and ESSM, and also provided engines to a variety of European weapons, but also know that its solid fuel is very powerful. NAMMO has wanted to cross from solid fuel to stamping for many years, and the shells fired this time are also the same as the designs it has been selling for many years, and Boeing is just a ready-made father, responsible for system integration (packaging) and advancing the US military.
Figure 1: NAMMO compares the bottom of the bomb, rocket booster and solid ram, and it can be found that the solid ram is a rocket booster + culvert, in fact, it can be called a ram booster
Figure 2: Comparing solid stamping with liquid stamping, the biggest difference is that solid stamping puts the fuel in the combustion chamber
Figure 3: A cross-sectional view of NAMMO's previous exhibition shows that there is a layer of solid fuel in the combustion chamber behind it
Figure 4: Photo of Boeing and NAMMO test-firing to the media
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