シャドーイング練習: How does a Steam Turbine Work? - 動画で英語スピーキングを学ぶ
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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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このレッスンの語彙とスピーキングのポイント
このスピーキングレッスンは、動画「How does a Steam Turbine Work?」を教材にしています。 繰り返し出てくる語は次のとおりです：turbine, steam, energy, speed, blade。 この動画には、シャドーイング用の文が65文、単語が822語あります。 音声の長さは5:42です。 話す速さは1分あたり約144語で安定しており、シャドーイングしやすいペースです。 英語の頻出3,000語に含まれる単語は80%だけなので、語彙は難しめです。
この動画の重要語彙
動画に出てくる覚えておきたい単語15語を、発音と意味つきで紹介します。
| 単語 | 発音 | 意味 |
|---|---|---|
| turbine 名詞 | /ˈtɜː.baɪn/ | タービン |
| blade 名詞 | /bleɪd/ | 刃, ブレード |
| fluid 名詞 | /ˈflu.ɪd/ | 流体, 液体 |
| rotate 動詞 | /ˈɹoʊ.teɪt/ | 回る |
| efficiency 名詞 | /ɪˈfɪʃ.ən.si/ | 効率性, 効率 |
| decrease 動詞 | /dɪˈkɹiːs/ | 減少する, 減る |
| velocity 名詞 | /vəˈlɑsəti/ | 速度 |
| compare 動詞 | /kəmˈpɛɚ/ | 比べる, 比較する |
| angle 名詞 | /ˈæŋ.ɡəl/ | 角度 |
| divide 動詞 | /dɪˈvaɪd/ | 分割する, 分ける |
| generator 名詞 | /ˈdʒɛnəɹeɪtə(ɹ)/ | 発電機 |
| attach 動詞 | /əˈtæt͡ʃ/ | 付ける, 添付する |
| output 名詞 | /ˈaʊtpʊt/ | 出力 |
| equally 副詞 | /ˈiːkwəli/ | 等しく, 平等に |
| reduction 名詞 | /ɹɪˈdʌk.ʃən/ | 還元 |
動画に出てくる句動詞
| 単語 | 意味 |
|---|---|
| come down 動詞 | 降りる |
注意したい発音
- 「th」の音: thermal /ˈθɜːməl/, withstand /wɪðˈstænd/, enthalpy /ˈɛn.θəl.piː/, thermodynamics /ˌθɜː(ɹ)moʊdaɪˈnæmɪks/
- 「sh」と「zh」の音: efficiency /ɪˈfɪʃ.ən.si/, shaft /ˈʃɑːft/, reduction /ɹɪˈdʌk.ʃən/, stationary /ˈsteɪʃəˌnɛɹi/, implication /ˌɪmpləˈkeɪʃən/
- 長い単語（アクセントの位置に注意）: efficiency /ɪˈfɪʃ.ən.si/, velocity /vəˈlɑsəti/, mechanical /məˈkænəkəl/, generator /ˈdʒɛnəɹeɪtə(ɹ)/, electricity /ɪˌlɛkˈtɹɪsɪti/
日本語話者が苦手な音：
- /r/ と /l/ の区別 — /l/ は舌先を歯茎につけ、/r/ はどこにもつけない: electricity /ɪˌlɛkˈtɹɪsɪti/, proportionally /pɹəˈpɔɹʃənəli/, symmetrical /səˈmɛtrək(ə)l/
- /v/ — /b/ にならないように、上の歯を下唇に当てる: velocity /vəˈlɑsəti/, divide /dɪˈvaɪd/, vary /ˈvɛəɹi/, valve /ˈvælv/, convert /kənˈvɝt/
- /f/ — 「フ」ではなく、上の歯と下唇で出す: fluid /ˈflu.ɪd/, efficiency /ɪˈfɪʃ.ən.si/, shaft /ˈʃɑːft/, frequency /ˈfɹiːkwənsi/
この動画での練習方法
- まず声を出さずに動画を最後まで聞き、知らない単語をメモします。
- 通常の速度で一文ずつシャドーイングし、話し手のリズムに合うまで繰り返します。
- 自分の声を録音して元の音声と比べます。turbine, blade, fluidなどの単語に特に注意しましょう。
シャドーイングとは？英語上達に効果的な理由
シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。