What does 2 5E8 mean in the calculator?

"e" is scientific notation.

exponential separator.

It means "multiply 10 times squarely", i.e. "x10".

to the eighth power =

Discharge cooling is another type of convection cooling. Unlike regenerative cooling, the coolant used for exhaust cooling absorbs heat to the thrust chamber and is discharged out of the combustion chamber instead of entering the combustion chamber to participate in combustion. Direct drain coolant reduces the thrust chamber specific impulse, so the coolant flow for drain cooling needs to be minimized while only using drain cooling at the outlet section of the nozzle that is relatively less heated.

There is also radiative cooling, in which the heat flow is transferred from the combustion products to the thrust chamber, and then the heat is radiated by the thrust chamber wall to the surrounding space. Radiative cooling is characterized by simplicity and small structural mass. It is mainly used in the extension section of large nozzles and the thrust chamber of small thrust engines using high-temperature resistant materials.

When cooling in the thrust chamber of the tissue, a relatively low temperature liquid or gas protective layer is established on the surface of the thrust chamber wall to reduce the heat flow to the thrust chamber wall, reduce the wall temperature, and achieve cooling. Internal cooling is mainly divided into three methods: internal cooling (shield cooling), membrane cooling and diaphoretic cooling of head tissues. After the internal cooling measures are adopted in the thrust chamber, the mixing ratio near the wall of the combustion chamber is different from the optimal mixing ratio in the central area (in most cases, the near-wall layer rich in fuel is used) due to the need to reduce the temperature of the protective layer, resulting in the uneven distribution of the mixing ratio along the cross-section of the combustion chamber, so that the combustion efficiency is reduced to a certain extent.

Membrane cooling is similar to shield cooling in that it cools the thrust chamber wall by establishing a uniform and stable coolant film or air film protective layer near the inner wall surface, except that the coolant used to establish the protective layer is not injected by the injector, but is supplied through a special cooling belt. The cooling band is generally arranged in a cross-section of the combustion chamber or the convergence section of the nozzle. There can be several cooling bands along the length of the combustion chamber.

In order to improve the stability of the membrane, the coolant often flows through the gaps or small holes in the cooling belts, and when sweating is used, the thrust chamber wall or part of the inner wall is made of porous material with a pore diameter of tens of microns. Porous materials are usually sintered with metal powders or pressed with metal mesh. In this case, the number of pores per unit area is increased by making the micropores in the material as evenly distributed as possible.

The liquid coolant penetrates into the inner wall, creating a protective film that reduces the density of the heat transferred to the wall. When the flow rate of liquid coolant used for sweat cooling is above a certain threshold, a liquid film is formed near the wall of the thrust chamber. When the coolant flow rate is below the critical flow, the inner wall temperature will be higher than the coolant boiling point at the current pressure, and some or all of the coolant will evaporate, forming an air film.

In addition to the above thermal protection, there are other thermal protection methods such as: ablation cooling, thermal insulation cooling, hot melt cooling and composite protection of chamber walls. 3. Thermal protection scheme of high enthalpy gas generator Based on the above methods and the actual situation, the thermal protection method of high enthalpy gas generator is obtained.

The combustion chamber of a high-enthalpy gas generator differs from that of a liquid rocket engine, eliminating the front thrust chamber part, making its structure simpler and more effective. Then, the thermal protection involved is the thermal protection part of the combustion chamber wall. As the fuel enters the combustion chamber, it quickly decomposes and releases large quantities.

The answer to this question is 2000000000, and the calculator examines the scientific notation, which uses the scientific notation, which means 2 times 10 to the 8th power, which is 20000000.

The one facing above, the one below is wrong.

The calculator shows the meaning of the accompaniment: it is a multiple of 10 to the 9th power of the oak), which is a scientific method of counting.

Scientific counting is a method of counting where numbers are expressed as n times 10 to the nth power.

The calculator shows 9 to the 9th power: multiply 10 to the 9th power), which is a scientific way of notation.

Scientific counting is a method of counting. Numbers are expressed in the form of n times 10 to the nth power.

For example: 19971400000000=. The power of 10, represented by a calculator or computer, is usually e or e, ie.

The calculator shows 8 which means 5*10 8 (5 times 10 to the 8th power), which is a scientific notation display method.

Scientific notation is a method of notation in which a is expressed in the form of multiplying a by the nth power of 10 (1 a<10, n is an integer), and this notation is called scientific notation. When we want to mark or calculate a large or small one with a large number of digits, we use scientific notation to avoid wasting a lot of space and time.

For example: 188877000000=. A calculator or computer to express the power of 10 is generally expressed with e or e, that is.

Since the calculator copy shows valid.

The value is generally only 10 to 12 digits, so most calculators, especially scientific calculators, will display the results in this way, e is the abbreviation of exponent, e8 is the 8th power of 10, for example, that is, 000,000, equal to 500,000,000.

Right-click, Format Cells, and select Text.

<> this is a scientific counting method Fu Ruxiao missing draft.

The rubber's balance represents the form of a real number.