What does the author think of reading poetry for?

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.

1. Although reading poetry cannot change our destiny, it can change our character.

2. Reading the poetry of the model can not change the starting point of people's debate, but it can change the end of life, it can enrich our thoughts, improve our understanding of life, enrich our spiritual world, and make us look at real problems more rationally.

I once saw Mr. Ye Jiaying's sentence: "The advantage of reading poetry is that it can cultivate a beautiful lively and immortal heart", which made me feel very emotional, so I tried to interpret it from my perspective.

In terms of the existence of poems (songs), it can be traced back to the ancient tribe Ge Tianshi, which has been passed down to the present day, throughout the entire history of Chinese civilization, first of all, it is immortal in time.

Chinese poetry and poetry are mainly based on the expression of feelings, and there are only two emotions of emotion: the inspiration of nature and the inspiration of the human world. There are three kinds of writing techniques, Fu Bixing we must know, "Fu" is a direct description of the scene, that is, the thing is the heart of the sedan chair, "than" is to borrow the thing as a metaphor, the heart is in the thing first, "Xing" is because of the thing, the thing is in the heart first, to completely distinguish the three or read more poetry.

But in any case, the creation of poetry is inseparable from all things in nature, and whether it is a poet or a person who has been influenced by poetry for a long time, they are always sensitive to the perception of some changes in the natural world, and they can always discover the beauty of the natural world more easily than others, which will make their hearts more lively and delicate, such as summer nights, walking on the path, they can catch the cicadas, the moonlight, the summer wind, the stars, and even a tree on the side of the road, which can arouse their reverie. And some really great poets are using their lives to create poems, these poems have accumulated the great heart, wisdom, character, mind and cultivation of these poets, so poetry can convey to the reader the life characteristics of the poet it contains, and has an endless power of inspiration, which can make the reader's heart richer and more lively.

Flower Cow Song", I saw a cute flower cow. It sits or walks or lies down, all leisurely and free. As it moves, meadows, wildflowers, the sky, white clouds, the quietly moving sun, and the verdant peaks all appear in front of us.

This poem describes the various scenes of the action of the flower cow on the grassland, expresses the freedom of the flower cow, expresses the poet's love for life and the pursuit of freedom, and shows the poet's love and yearning for a free life.

"Literature, especially poetry, is partly about finding a way to live and live with uncertainty. "In the face of the huge and lasting turmoil brought about by the pandemic, you might as well read poetry.

We are always trying to create a seemingly uncertain rule, rhythm or habit for the sake of security in an uncertain life.

Especially for office workers, it seems like every day is second-hand life because you are always repeating the previous day's life.

Human beings have created rules and institutions to create a false sense of certainty and security. We emphasize that self-discipline can be free, and many people who don't know what to do unconsciously live themselves into a trap, repeating themselves day after day of yesterday.

We don't want to read poetry to escape life. In the era of the pandemic, it's hard to travel far, but you can choose to read poetry. Because the best feature of poetry is to help you break all the rules!

Especially when you are immersed in the imagery and artistic conception created by the poem, when your imagination flies, when the imagery of the poem is like a dizzying bullet shattering all the rules and armor, you will feel a kind of freedom in the poem - the freedom of the spirit, the freedom to smash all the shackles!