शैडोइंग अभ्यास: How does a Steam Turbine Work? - वीडियो के साथ अंग्रेजी बोलना सीखें
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65 वाक्य
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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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इस पाठ की शब्दावली और बोलने के सुझाव
यह स्पीकिंग पाठ वीडियो “How does a Steam Turbine Work?” पर आधारित है। सबसे ज़्यादा दोहराए गए शब्द ये हैं: turbine, steam, energy, speed, blade। इस वीडियो में शैडोइंग के लिए 65 वाक्य और 822 शब्द हैं। बोला गया हिस्सा 5:42 लंबा है। वक्ता लगभग 144 शब्द प्रति मिनट की स्थिर गति से बोलता है, जो शैडोइंग के लिए आरामदायक है। केवल 80% शब्द अंग्रेज़ी के 3,000 सबसे आम शब्दों में से हैं, इसलिए शब्दावली कठिन है।
इस वीडियो की मुख्य शब्दावली
वीडियो के 15 सीखने लायक शब्द, उच्चारण और अर्थ के साथ:
| शब्द | उच्चारण | अर्थ |
|---|---|---|
| turbine संज्ञा | /ˈtɜː.baɪn/ | टर्बाइन |
| blade संज्ञा | /bleɪd/ | ब्लेड |
| fluid संज्ञा | /ˈflu.ɪd/ | द्रव, तरल |
| decrease क्रिया | /dɪˈkɹiːs/ | घटना |
| velocity संज्ञा | /vəˈlɑsəti/ | वेग |
| compare क्रिया | /kəmˈpɛɚ/ | तौलना |
| angle संज्ञा | /ˈæŋ.ɡəl/ | कोण |
| divide क्रिया | /dɪˈvaɪd/ | बांटना |
| generator संज्ञा | /ˈdʒɛnəɹeɪtə(ɹ)/ | जनित्र, जनरेटर |
| reduction संज्ञा | /ɹɪˈdʌk.ʃən/ | कटौती |
| frequency संज्ञा | /ˈfɹiːkwənsi/ | आवृत्ति |
| mechanism संज्ञा | /ˈmɛk.ə.nɪ.zəm/ | तंत्र, यंत्रावली |
| twist क्रिया | /twɪst/ | मोड़ना, मरोड़ना |
| logical विशेषण | /ˈlɑd͡ʒɪkəl/ | तार्किक |
| valve संज्ञा | /ˈvælv/ | वाल्व |
ध्यान देने योग्य उच्चारण
- “th” की ध्वनियाँ: thermal /ˈθɜːməl/, withstand /wɪðˈstænd/, enthalpy /ˈɛn.θəl.piː/, thermodynamics /ˌθɜː(ɹ)moʊdaɪˈnæmɪks/
- “sh” और “zh” की ध्वनियाँ: efficiency /ɪˈfɪʃ.ən.si/, shaft /ˈʃɑːft/, reduction /ɹɪˈdʌk.ʃən/, stationary /ˈsteɪʃəˌnɛɹi/, implication /ˌɪmpləˈkeɪʃən/
- लंबे शब्द — बलाघात सही रखें: efficiency /ɪˈfɪʃ.ən.si/, velocity /vəˈlɑsəti/, mechanical /məˈkænəkəl/, generator /ˈdʒɛnəɹeɪtə(ɹ)/, electricity /ɪˌlɛkˈtɹɪsɪti/
हिंदी भाषियों के लिए मुश्किल ध्वनियाँ:
- /v/ और /w/ का फ़र्क़ — /v/ में ऊपर के दाँत निचले होंठ को छूते हैं, /w/ में होंठ गोल होते हैं: velocity /vəˈlɑsəti/, divide /dɪˈvaɪd/, equally /ˈiːkwəli/, frequency /ˈfɹiːkwənsi/, vary /ˈvɛəɹi/
- /z/ — इसे “ज” (/dʒ/) न बनाएँ: mechanism /ˈmɛk.ə.nɪ.zəm/, observe /əbˈzɜːv/, nozzle /ˈnɒzəl/, synchronize /ˈsɪŋ.kɹə.naɪːz/
- /æ/ — “ऐ” से ज़्यादा खुला: angle /ˈæŋ.ɡəl/, mechanical /məˈkænəkəl/, attach /əˈtæt͡ʃ/, expand /ɪkˈspænd/, valve /ˈvælv/
इस वीडियो से अभ्यास कैसे करें
- पहले बिना बोले पूरा वीडियो एक बार सुनें और जो शब्द नहीं आते उन्हें लिख लें।
- सामान्य गति पर एक-एक वाक्य की शैडोइंग करें और हर वाक्य तब तक दोहराएँ जब तक आपकी लय वक्ता से न मिल जाए।
- अपनी आवाज़ रिकॉर्ड करें और मूल से तुलना करें, ख़ासकर turbine, blade, fluid जैसे शब्दों पर ध्यान दें।
शैडोइंग तकनीक क्या है?
शैडोइंग (Shadowing) एक विज्ञान-समर्थित भाषा सीखने की तकनीक है जो मूल रूप से पेशेवर दुभाषिया प्रशिक्षण के लिए विकसित की गई थी। विधि सरल लेकिन शक्तिशाली है: आप मूल अंग्रेज़ी ऑडियो सुनते हैं और तुरंत इसे ज़ोर से दोहराते हैं — जैसे वक्ता की छाया 1-2 सेकंड की देरी से। शोध से पता चलता है कि यह उच्चारण सटीकता, स्वर, लय, जुड़ी हुई ध्वनियाँ, सुनने की समझ और बोलने की प्रवाहशीलता में काफ़ी सुधार करता है।