Although Jochen has been subtly changing the design limitations of German ship design, and most feels the world's leading ideas, in the final analysis, this is just some new thinking that can be regarded as a flash of inspiration. In terms of basic theoretical research and mathematical analysis, Jochen could not provide any help. In order to change the weakness of the German Navy in the basic field, it takes a lot of experiments, comparisons, and accumulation. So Jochen wanted to build a large research institute.

In Jochen's plan, this institution would in the future involve the testing and collection of all the techniques of the Imperial Navy, and therefore the area involved was extremely large, and it was clearly insufficient to attempt to appear in the form of a private real room. So Jochen decided to let the Admiralty take the lead in forming this body. The first step in Jochen's plan was to establish a fluid chamber and a towing pool for the numerical performance of the ship.

"Sir Montz, you are indeed talking about our current situation, but we cannot go on like this. Now the tonnage of ships is smaller, and the speed requirements are lower, so the problem is not obvious. But when the tonnage of the ship exceeds 10,000 tons, and the speed exceeds 25 knots, then the difference in power utilization will cost us dearly, and this moment will not be too far away from us. So we have to start working on it now, and I hope the Admiralty can do something about it. ”

"What does Your Highness want our Admiralty to do?"

"Establish a naval technical room, a practical room to provide necessary technical support to manufacturers of various naval equipment. For example, the problem of low power utilization rate of ships we are currently facing is nothing more than several possibilities: the hull alignment is not optimized enough, resulting in large resistance in the water of the hull; The efficiency of the propeller is not high, resulting in a waste of power; The stern water flow is disturbed, the thrust of the guide is reduced, and so on, and now we don't know which one, or several, or even all of them, lead us to the low utilization of power. So we have to find out and then correct it, which is the core purpose of the establishment of this real room. ”

In short, no matter what the situation is, if there is a change, there will be encouragement, and all possibilities should be taken into account.

"How to find these problems and how to solve them. It is not enough to rely on drawings alone, so we need a research room where we can collect actual numbers. This chamber is dedicated to the study of fluids, as well as the combination of numerical calculations and physical experiments. In 1872, the Englishman W. Froude created the world's first ship model test pool in Torquay, England, and proposed the number of similar criteria for ship model testing - Froude number, which established the foundation of modern ship model testing technology. However, the scale of our pond and the actual yàn simulation and the number of jù collections are not very ideal. It is difficult to build a modern large-scale pool solely by relying on a shipyard, so I hope that the Admiralty can take the lead, contact universities, academies of sciences, and shipyards, convene fluid experts, ship designers, and establish a hydrodynamic laboratory, and in order to collect test numbers, it is necessary to establish a large-scale ship numerical performance towing pool. ”

"Your Highness, we now have our own towing pool, and the major shipyards also have it."

"Your pools are too small and not fully functional. What I want to build is a high-speed deep pool with a length of 400 meters, a width of 18 meters, and a depth of 8 meters. Jochen directly gave a specification that would be absolutely terrifying at this point.

In 1891 the Russians built their deep pool in St. Petersburg, which was 141 meters long, 7 meters wide and 3 meters deep, while in 1906 the French built a deep pool 160 meters long, 10 meters wide and 4 meters deep. However, the length of these pools is insufficient to be used as high-speed pools. In Jochen's previous life, the world's longest high-speed pool was built by the French in 1978, and the length of the pool reached 1,150 meters. In order to do this in one step, Jochen decided to build Germany's first comprehensive large-scale large-scale marine numerical performance towing tank with the length and depth of the high-speed deep-water pool built by the British at Felton in 1957 and the width of the deep-water wide tank built by Germany in Hamburg in 1876.

Of course, digging a pool is very simple, but the supporting test equipment is very difficult.

"You are now using small pools, and the general method used to measure the resistance of the hull is the isoresistance method, which measures the speed of the ship model when the weight of the weight is dragged to measure the speed of the ship model at a constant speed, and then changes the weight of the weight to measure the change curve between the resistance and the velocity. There are not many small pools like this that can be obtained. Many of the more complex environmental simulations are not possible. The large pool I proposed, because the scale is large enough, you can use a trailer to drag the ship model, and change the speed of the trailer to measure the resistance of the ship model, acceleration, constant speed, maximum speed, deceleration, etc.

And not only to measure the resistance, but also to make the pool have the ability to simulate the wave environment, to install a wave maker that can produce regular and irregular waves in the pool, not only to be able to create longitudinal waves, but also to create transverse waves and oblique waves, so as to measure the stability of the hull in various wave environments, recovery, seaworthiness and roll period. And in order to avoid the test of the ship model in laminar flow, there must also be rapids equipment. Such a large pool can provide a reliable enough number for our ship design.

With this pool, we can carry out three kinds of experiments:

In the resistance test of the ship model, the boat model is towed at the same speed with a trailer, and the resistance encountered by the ship model is measured with a resistance meter. According to Froud's law, the drag test results are converted into the actual ship resistance at a comparable speed, and then multiplied by the speed to calculate the effective horsepower of the real ship.

In the propeller open water test, the model propeller is installed at the front end of the open water test chamber, and the motor in the chamber rotates the propeller through the guò propeller power instrument. Constant velocity towing open water tank, systematically change the speed, or the speed is unchanged, systematically change the speed, measure the thrust and torque of the propeller by the power instrument, record the speed and speed, calculate the thrust coefficient, torque coefficient and propeller water opening efficiency of each advance coefficient. This test is called the propeller open water test. The propeller's water opening characteristic curve is drawn accordingly.

In the self-propelled test of the model ship, the model propeller is installed in the stern of the ship model with accessories to simulate the sailing state of the real ship. The electric motor installed in the ship model rotates the propeller through the guò propeller power instrument to push the ship model forward; Measure propeller thrust, torque, record speed, propeller speed and forcing force. Because the friction resistance coefficient of the ship model is larger than that of the real ship, that is, the propeller load coefficient of the ship model is larger than that of the real ship when it is self-propelled. In the pure self-propelled test, it is necessary to add tension to the ship model, so that the self-propelled state of the ship model fully corresponds to the sailing state of the real ship. The test results are comprehensively analyzed together with the resistance test data of the ship model and the propeller open water real data, and the mate current fraction, thrust derating, and other relevant coefficients can be obtained, so as to grasp the interaction between the hull and the propeller, and predict the main engine power and propulsion performance of the real ship at various speeds.

In order to measure these numbers, we install measuring instruments and recording devices for the pool. In order to be able to modify and correct the performance of the ship model and the propeller at any time, a large hull model and propeller model workshop must be attached to the pool. In order to perform calculations and research, we need a research office where researchers can work. And in order to store the research numbers, we need large archives. So this large pool is a large scientific research institution in itself. There is a lot of manpower, material and financial resources that need to be invested, do you think the shipyard alone can do it? Jochen asked with a smile.

Hearing that it was so large, everyone was silent. Indeed, this kind of scientific research institution can only be built by the power of the state.

Jochen continued: "Not only surface ships, but also all equipment that has a problem with fluids can be carried out here. For example, submarines, such as torpedoes, can also be tested using pools. In addition, this research institute not only conducts research on the application of fluid science based on pools, but also conducts research on the strength of ship structures, research on sinking resistance, and a series of related disciplines. The results of the research can be applied to practical applications. Thus forming a complete research base here. In fact, Jochen also wants to build a wind tunnel here for aircraft research, but at this time, it is estimated that the only thing that can bring humans into the sky is the glider, so it is better to forget it, although now Jochen has a more powerful engine than the engine that brought the Wright brothers to the sky back then. However, it is too early to conduct research on the aircraft, so there is no hurry.

Of course, the construction of such a large-scale research institute will inevitably cost an astonishing amount of money, and the construction period will be long, and it is estimated that no results will be seen in one or two years, but once such a large-scale and long-term research facility is completed and put into use, the role it can play in the technological progress of the Imperial Navy is immeasurable.

His Excellency the Secretary of the Navy, of course, also recognized the value of such a scientific research institution, and immediately agreed to take the lead in the preparations with the Navy. Moreover, after all, they are scientific research institutions and basic research, and the parliament's appropriation is for scientific research, which does not occupy the navy's military expenditure in the slightest, so why not do it.

Once this research institute is built, it will not only provide a large number of research points for the ships of the Navy. And when it can show its research value, it will also drive the interest of universities, scientific research institutions and even private enterprises in it, and when the numerical performance towing pools of ships of all sizes appear, it will naturally bring about a leap in fluid science and shipbuilding technology for the empire.

"Your Highness, then this new research institute should belong to the military research unit. What should we call when we apply to the Parliament? ”

"Since it is a research institute of the Navy, it is called the Naval Strategic Research Institute (StrategicNavalResearch Institute), or SNRI for short."

PS: StrategicNavalResearchInstitute is also translated into the German translation of the Naval Institute of Strategic Studies, and some German letters will become question marks if they are not displayed at the starting point, for example, the German letter of the destroyer in chapter 58 becomes? In the future, I will try to replace the German letters that appear here with English letters, mainly to look smooth and avoid question marks