쉐도잉 연습: How does a Steam Turbine Work? - 영상으로 영어 말하기 배우기
연습 모드 선택
각 모드는 전체 화면 연습실로 열립니다.
65 문장
문장이 너무 짧거나 길면 Edit를 눌러 조정하세요.
1
Nuclear and coal -based thermal power plants together produce almost half of the world's power.
2
Steam turbines lie at the heart of these power plants.
3
They convert thermal energy in the steam to mechanical energy.
4
This video will explain the inner workings of the steam turbines
5
and why they are constructed in the manner they are in a step -by -step, logical manner.
6
To understand its basic workings, let's first observe one of their blades.
7
You can see that the blade of a steam turbine has an airfoil shape.
8
When the high energy fluid passes over it, this airfoil shape will create a pressure difference.
9
This will subsequently create lift force.
10
The lift force will rotate the turbine.
11
In short, the energy in the fluid transfers to the mechanical energy of the rotor.
12
To further understand steam turbine operation, let's understand fluid energy in greater depth.
13
A fluid has three forms of energy, due to its speed, pressure, and temperature.
14
As the blades absorb energy from the fluid, all three forms of energy come down.
15
The low -velocity jet is of no use to produce effective lift force.
16
To increase velocity, the fluid is passed through a stator section.
17
The stator set is stationary and attached to the turbine casing.
18
You can see that flow area decreases along the stator and the speed thus increases.
19
In short, the stator acts like a nozzle.
20
As the speed of the jet increases in the stator, kinetic energy increases.
21
As there is no net energy transfer in the fluid in stator section,
22
the pressure and temperature of the jet should decrease to keep the total energy constant.
23
Now, the next row of rotors is added.
24
The stator also makes sure
25
that the flow coming out of it will be at an optimum angle of attack to the next rotor set.
26
After that, another nozzle set is added.
27
Many such sets are used in a steam turbine.
28
There is an important term while designing steam turbines, namely degree of reaction.
29
This term is calculated by dividing pressure and temperature energy by the total energy change in the rotor.
30
Pressure and temperature energy together is called enthalpy.
31
The degree of reaction decides what type of steam turbine it is.
32
As the pressure of the steam undergoes a drastic reduction during steam turbine operation, its volume increases proportionally.
33
To accommodate such an expanded steam, we have to increase the flow area.
34
Otherwise, the flow speed will become too high.
35
This is the reason why the steam turbine blades are too long towards the outlet.
36
You can see how long the last stage turbine blades are compared to the first stage blades.
37
The tips of such long blades will have very high velocity compared to the root.
38
A twist is given to it so that all blade cross sections will remain at an optimum angle of attack.
39
This kind of large turbine uses two such symmetrical units.
40
You can see how the steam is equally divided between these units.
41
High -capacity power plants use different stages of steam turbines, such as high -pressure turbine,
42
intermediate -pressure turbine, and low -pressure turbines.
43
All these units are attached to a single rotating shaft.
44
The shaft in turn is connected to a generator.
45
The reason for such different stages is quite interesting.
46
With greater steam temperature comes greater power plant efficiency.
47
This is according to the second law of thermodynamics.
48
But we cannot have temperature greater than 600 degrees Celsius, since the turbine blade material will not withstand temperature more than that.
49
Temperature of the steam decreases as it flows along the rows of the blade.
50
Consequently, a great way to increase power plant efficiency is to add more heat after the first stage.
51
So after the first stage, the steam is bypassed to the boiler and more heat is added.
52
This is known as reheating.
53
This will increase the steam temperature again, leading to higher power plant efficiency and output.
54
One challenging problem in power plant operation is to keep the speed of the steam turbine constant.
55
This is important since frequency of the electricity produced is directly proportional to the generator speed.
56
However, depending on the load or power demand, the steam turbine speed will vary.
57
To keep the steam turbine speed constant, a steam flow governing mechanism is used.
58
If the steam turbine rotates at a higher speed,
59
the control valve will automatically reduce the steam flow rate to the turbine until the speed becomes normal.
60
If the turbine rotates at a low speed, the inverse will be done.
61
In this way, the balance of power demand and power supply will be perfectly synchronized.
62
To learn more about degree of reaction and its implications, please check the next video.
63
Please help us at patreon .com so
64
that we can add one more member to the team and we will be able to release two educational videos per month.
65
Thank you!
앱 다운로드
유창하게 말하는 데 필요한 모든 것
AI 발음 평가문장마다 점수 확인
IPA 발음 연습모든 소리 마스터
단어 학습나만의 단어장 만들기
단어 게임놀면서 외우기
같은 채널
FOR YOU
추천 영상
C11
507 문장
Steam Turbine Construction Operating Fundamentals
Daily ConversationUniversity Students
C11
7 문장
Diodes Explained - The basics how diodes work working principle pn junction
Daily ConversationUniversity StudentsWorking Adults
C11
40 문장
The Engineering that Runs the Digital World 🛠️⚙️💻 How do CPUs Work?
Daily ConversationUniversity StudentsWorking Adults
C11
113 문장
Architectural Design Process Explained
Daily ConversationUniversity StudentsWorking Adults
C192 문장
Aircraft Gas Turbine Engines #01 - Introduction Part 1
Daily ConversationUniversity Students
C11
51 문장
What's Under Your Feet in New York City?
Daily ConversationUniversity StudentsWorking Adults
C11
150 문장
Parallel Pump Operation
Daily ConversationUniversity StudentsWorking Adults
C11
57 문장
IELTS Listening - Renewable energy by sea waves
Daily ConversationUniversity Students
C11
19 문장
I Made an EMP Device... It Actually Works
Daily ConversationUniversity StudentsWorking Adults
C1287 문장
Differential equations, a tourist's guide | DE1
Daily ConversationUniversity Students
C194 문장
who is the Chief Engineer on a ship? what are his responsibilities? -latest-www.maritimeplatform.com
Daily ConversationUniversity Students
이 레슨의 어휘와 말하기 포인트
이 말하기 레슨은 영상 “How does a Steam Turbine Work?”을(를) 바탕으로 합니다. 가장 자주 반복되는 단어는 다음과 같습니다: turbine, steam, energy, speed, blade. 이 영상에는 섀도잉할 문장 65개와 단어 822개가 있습니다. 말하는 구간의 길이는 5:42입니다. 화자는 분당 약 144단어의 일정한 속도로 말해서 섀도잉하기에 편한 속도입니다. 영어에서 가장 많이 쓰이는 3,000단어에 속하는 단어가 80%뿐이라 어휘가 어려운 편입니다.
이 영상의 핵심 어휘
영상에 나오는 익혀 둘 만한 단어 15개를 발음, 뜻과 함께 정리했습니다.
| 단어 | 발음 | 뜻 |
|---|---|---|
| turbine 명사 | /ˈtɜː.baɪn/ | 터빈 |
| blade 명사 | /bleɪd/ | 날 |
| fluid 명사 | /ˈflu.ɪd/ | 유체, 유동체 |
| velocity 명사 | /vəˈlɑsəti/ | 속도 |
| compare 동사 | /kəmˈpɛɚ/ | 비교하다, 비유하다 |
| angle 명사 | /ˈæŋ.ɡəl/ | 각, 각도 |
| divide 동사 | /dɪˈvaɪd/ | 나누다, 가르다 |
| generator 명사 | /ˈdʒɛnəɹeɪtə(ɹ)/ | 발전기 |
| attach 동사 | /əˈtæt͡ʃ/ | 첨부하다, 붙이다 |
| output 명사 | /ˈaʊtpʊt/ | 출력 |
| reduction 명사 | /ɹɪˈdʌk.ʃən/ | 환원 |
| connect 동사 | /kəˈnɛkt/ | 잇다, 연결하다 |
| frequency 명사 | /ˈfɹiːkwənsi/ | 빈도 |
| expand 동사 | /ɪkˈspænd/ | 펴다, 피다 |
| mechanism 명사 | /ˈmɛk.ə.nɪ.zəm/ | 기구, 메커니즘 |
영상에 나오는 구동사
| 단어 | 뜻 |
|---|---|
| come down 동사 | 내려오다 |
주의할 발음
- “th” 소리: thermal /ˈθɜːməl/, withstand /wɪðˈstænd/, enthalpy /ˈɛn.θəl.piː/, thermodynamics /ˌθɜː(ɹ)moʊdaɪˈnæmɪks/
- “sh”와 “zh” 소리: efficiency /ɪˈfɪʃ.ən.si/, shaft /ˈʃɑːft/, reduction /ɹɪˈdʌk.ʃən/, stationary /ˈsteɪʃəˌnɛɹi/, implication /ˌɪmpləˈkeɪʃən/
- 긴 단어 — 강세 위치에 주의: efficiency /ɪˈfɪʃ.ən.si/, velocity /vəˈlɑsəti/, mechanical /məˈkænəkəl/, generator /ˈdʒɛnəɹeɪtə(ɹ)/, electricity /ɪˌlɛkˈtɹɪsɪti/
한국어 화자가 어려워하는 소리:
- /f/ — ㅍ(/p/)으로 바꾸지 말고 윗니를 아랫입술에 대기: fluid /ˈflu.ɪd/, efficiency /ɪˈfɪʃ.ən.si/, shaft /ˈʃɑːft/, frequency /ˈfɹiːkwənsi/
- /v/ — ㅂ(/b/)과 구별하기: velocity /vəˈlɑsəti/, divide /dɪˈvaɪd/, vary /ˈvɛəɹi/, valve /ˈvælv/, convert /kənˈvɝt/
- /z/ — ㅈ이 아니라 성대를 울리는 /s/: mechanism /ˈmɛk.ə.nɪ.zəm/, observe /əbˈzɜːv/, nozzle /ˈnɒzəl/, synchronize /ˈsɪŋ.kɹə.naɪːz/
이 영상으로 연습하는 방법
- 먼저 말하지 않고 영상을 끝까지 듣고 모르는 단어를 적어 둡니다.
- 보통 속도로 한 문장씩 섀도잉하고, 화자의 리듬과 맞을 때까지 반복합니다.
- 자신의 목소리를 녹음해 원본과 비교하고, turbine, blade, fluid 같은 단어에 특히 주의합니다.
쉐도잉이란? 영어 실력을 빠르게 키우는 과학적 방법
쉐도잉(Shadowing)은 원래 전문 통역사 훈련을 위해 개발된 언어 학습 기법으로, 다언어 학자인 Dr. Alexander Arguelles에 의해 대중화된 방법입니다. 핵심 원리는 간단하지만 매우 강력합니다: 원어민의 영어를 들으면서 1~2초의 짧은 지연으로 즉시 소리 내어 따라 말하는 것——마치 '그림자(shadow)'처럼 화자를 따라가는 것입니다. 문법 공부나 수동적인 청취와 달리, 쉐도잉은 뇌와 입 근육이 동시에 실시간으로 영어를 처리하고 재현하도록 훈련합니다. 연구에 따르면 이 방법은 발음 정확도, 억양, 리듬, 연음, 청취력, 말하기 유창성을 크게 향상시킵니다. IELTS 스피킹 준비와 자연스러운 영어 소통을 원하는 분들에게 특히 효과적입니다.