Prática de Shadowing: How does a Steam Turbine Work? - Aprenda a falar inglês com vídeo
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Nuclear and coal -based thermal power plants together produce almost half of the world's power.
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Steam turbines lie at the heart of these power plants.
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They convert thermal energy in the steam to mechanical energy.
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This video will explain the inner workings of the steam turbines
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and why they are constructed in the manner they are in a step -by -step, logical manner.
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To understand its basic workings, let's first observe one of their blades.
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You can see that the blade of a steam turbine has an airfoil shape.
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When the high energy fluid passes over it, this airfoil shape will create a pressure difference.
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This will subsequently create lift force.
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The lift force will rotate the turbine.
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In short, the energy in the fluid transfers to the mechanical energy of the rotor.
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To further understand steam turbine operation, let's understand fluid energy in greater depth.
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A fluid has three forms of energy, due to its speed, pressure, and temperature.
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As the blades absorb energy from the fluid, all three forms of energy come down.
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The low -velocity jet is of no use to produce effective lift force.
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To increase velocity, the fluid is passed through a stator section.
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The stator set is stationary and attached to the turbine casing.
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You can see that flow area decreases along the stator and the speed thus increases.
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In short, the stator acts like a nozzle.
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As the speed of the jet increases in the stator, kinetic energy increases.
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As there is no net energy transfer in the fluid in stator section,
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the pressure and temperature of the jet should decrease to keep the total energy constant.
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Now, the next row of rotors is added.
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The stator also makes sure
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that the flow coming out of it will be at an optimum angle of attack to the next rotor set.
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After that, another nozzle set is added.
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Many such sets are used in a steam turbine.
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There is an important term while designing steam turbines, namely degree of reaction.
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This term is calculated by dividing pressure and temperature energy by the total energy change in the rotor.
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Pressure and temperature energy together is called enthalpy.
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The degree of reaction decides what type of steam turbine it is.
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As the pressure of the steam undergoes a drastic reduction during steam turbine operation, its volume increases proportionally.
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To accommodate such an expanded steam, we have to increase the flow area.
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Otherwise, the flow speed will become too high.
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This is the reason why the steam turbine blades are too long towards the outlet.
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You can see how long the last stage turbine blades are compared to the first stage blades.
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The tips of such long blades will have very high velocity compared to the root.
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A twist is given to it so that all blade cross sections will remain at an optimum angle of attack.
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This kind of large turbine uses two such symmetrical units.
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You can see how the steam is equally divided between these units.
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High -capacity power plants use different stages of steam turbines, such as high -pressure turbine,
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intermediate -pressure turbine, and low -pressure turbines.
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All these units are attached to a single rotating shaft.
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The shaft in turn is connected to a generator.
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The reason for such different stages is quite interesting.
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With greater steam temperature comes greater power plant efficiency.
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This is according to the second law of thermodynamics.
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But we cannot have temperature greater than 600 degrees Celsius, since the turbine blade material will not withstand temperature more than that.
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Temperature of the steam decreases as it flows along the rows of the blade.
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Consequently, a great way to increase power plant efficiency is to add more heat after the first stage.
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So after the first stage, the steam is bypassed to the boiler and more heat is added.
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This is known as reheating.
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This will increase the steam temperature again, leading to higher power plant efficiency and output.
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One challenging problem in power plant operation is to keep the speed of the steam turbine constant.
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This is important since frequency of the electricity produced is directly proportional to the generator speed.
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However, depending on the load or power demand, the steam turbine speed will vary.
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To keep the steam turbine speed constant, a steam flow governing mechanism is used.
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If the steam turbine rotates at a higher speed,
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the control valve will automatically reduce the steam flow rate to the turbine until the speed becomes normal.
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If the turbine rotates at a low speed, the inverse will be done.
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In this way, the balance of power demand and power supply will be perfectly synchronized.
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To learn more about degree of reaction and its implications, please check the next video.
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Please help us at patreon .com so
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that we can add one more member to the team and we will be able to release two educational videos per month.
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Thank you!
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Vocabulário e dicas de fala para esta lição
Esta aula de conversação usa o vídeo “How does a Steam Turbine Work?”. As palavras que mais se repetem: turbine, steam, energy, speed, blade. Este vídeo tem 65 frases e 822 palavras para praticar shadowing. A fala dura 5:42. O falante mantém um ritmo estável de cerca de 144 palavras por minuto, confortável para o shadowing. Apenas 80% das palavras estão entre as 3.000 mais comuns do inglês, por isso o vocabulário é exigente.
Vocabulário principal deste vídeo
15 palavras do vídeo que vale a pena aprender, com pronúncia e significado:
| Palavra | Pronúncia | Significado |
|---|---|---|
| turbine substantivo | /ˈtɜː.baɪn/ | turbina |
| blade substantivo | /bleɪd/ | lâmina, fio |
| fluid substantivo | /ˈflu.ɪd/ | fluido, líquido |
| rotate verbo | /ˈɹoʊ.teɪt/ | rotar, girar |
| efficiency substantivo | /ɪˈfɪʃ.ən.si/ | eficiência |
| decrease verbo | /dɪˈkɹiːs/ | diminuir, reduzir |
| velocity substantivo | /vəˈlɑsəti/ | velocidade |
| compare verbo | /kəmˈpɛɚ/ | comparar |
| angle substantivo | /ˈæŋ.ɡəl/ | ângulo |
| mechanical adjetivo | /məˈkænəkəl/ | mecânico |
| divide verbo | /dɪˈvaɪd/ | dividir, separar |
| thermal adjetivo | /ˈθɜːməl/ | térmico, termal |
| generator substantivo | /ˈdʒɛnəɹeɪtə(ɹ)/ | gerador |
| shaft substantivo | /ˈʃɑːft/ | haste, cabo |
| attach verbo | /əˈtæt͡ʃ/ | anexar |
Pronúncia para ficar de olho
- Os sons de “th”: thermal /ˈθɜːməl/, withstand /wɪðˈstænd/, enthalpy /ˈɛn.θəl.piː/, thermodynamics /ˌθɜː(ɹ)moʊdaɪˈnæmɪks/
- Os sons de “sh” e “zh”: efficiency /ɪˈfɪʃ.ən.si/, shaft /ˈʃɑːft/, reduction /ɹɪˈdʌk.ʃən/, stationary /ˈsteɪʃəˌnɛɹi/, implication /ˌɪmpləˈkeɪʃən/
- Palavras longas — acerte a sílaba tônica: efficiency /ɪˈfɪʃ.ən.si/, velocity /vəˈlɑsəti/, mechanical /məˈkænəkəl/, generator /ˈdʒɛnəɹeɪtə(ɹ)/, electricity /ɪˌlɛkˈtɹɪsɪti/
Sons difíceis para falantes de português:
- Consoante final — sem acrescentar um “i” depois: blade /bleɪd/, fluid /ˈflu.ɪd/, rotate /ˈɹoʊ.teɪt/, divide /dɪˈvaɪd/, shaft /ˈʃɑːft/
- /l/ final — a língua toca o céu da boca, não vira “u”: angle /ˈæŋ.ɡəl/, mechanical /məˈkænəkəl/, thermal /ˈθɜːməl/, logical /ˈlɑd͡ʒɪkəl/, nozzle /ˈnɒzəl/
Como praticar com este vídeo
- Ouça o vídeo inteiro uma vez sem falar e anote as palavras que você não conhece.
- Faça shadowing frase por frase na velocidade normal, repetindo cada uma até o seu ritmo ficar igual ao do falante.
- Grave a sua voz e compare com o original, prestando atenção a palavras como turbine, blade, fluid.
O que é a Técnica de Shadowing?
Shadowing é uma técnica de aprendizado de idiomas com base científica, originalmente desenvolvida para o treinamento de intérpretes profissionais. O método é simples, mas poderoso: você ouve áudio em inglês nativo e repete imediatamente em voz alta — como uma sombra seguindo o falante com 1-2 segundos de atraso. Pesquisas mostram melhora significativa na precisão da pronúncia, entonação, ritmo, sons conectados, compreensão auditiva e fluência na fala.