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[๊ณ ๋ ค๋Œฟ’ํ•™๊ป“] ๊ธฐ๊ณ„๊ณตํ•™์‹คํ—˜2 A+ / 8. Smoke, Wind Tunnel Experiment

"[๊ณ ๋ ค๋Œฟ’ํ•™๊ป“] ๊ธฐ๊ณ„๊ณตํ•™์‹คํ—˜2 A+ / 8. Smoke, Wind Tunnel Experiment"์— ๋Œ€ํ•œ ๋‚ด์šฉ์ž…๋‹ˆ๋‹ค.
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์ตœ์ดˆ๋“ฑ๋ก์ผ 2022.04.27 ์ตœ์ข…์ ฟ’์ž‘์ผ 2021.09
9P ๋ฏธ๋้ฉ๋ณด๊ธฐ
[๊ณ ๋ ค๋Œฟ’ํ•™๊ป“] ๊ธฐ๊ณ„๊ณตํ•™์‹คํ—˜2 A+ / 8. Smoke, Wind Tunnel Experiment
  • ๋ณธ ๋ฌธ์„œ๋Š” PDF๋ฌธ์„œ์œผ๋กœ ๋ณต์‚ฌ ๋ฐ ํŽธ์ง‘์ด ๋ถˆ๊ฐ€ํ•ฉ๋‹ˆ๋‹ค.

    ๋ฏธ๋้ฉ๋ณด๊ธฐ

    ๋ชฉ์ฐจ

    1. Smoke Tunnel Experiment
    1) Observe and record various streamline of the figures through observing the visualization glass.
    2) What is curvature effect of the external flow?
    3) Explain the cause of the separation at the external flow of the cylinder and sphere shape material.
    4) Explain the Stall phenomenon at the airfoil, and investigate relationship between the change of the separation point at the streamline and the Stall phenomenon.
    5) Investigate the flow Phenomenon occurs around the 3 dimensional airfoil.
    6) Write about the Streamline and Stream function.
    7) Propose improved designs of the apparatus considering the theories that you have learned in this experiment.

    2. Wind Tunnel Experiment
    1) Calculate the wind speed.
    2) ~ 3) Find the lift, drag, lift and drag coefficients of each test. And record the calculation results in the measurement table.
    4) Draw an angle of attack - lift coefficient plot.
    5) Draw an angle of attack - drag coefficient plot.
    6) Analyze the change of lift coefficient and drag coefficient according to the angle of attack. Particularly, Analyze the angle of attack where Stall Phenomenon occurs
    7) Analyze the reason why the angles of attack where the Stall begins to occur are different when increasing the angle of attack and when decreasing the angle of attack respectively.
    8) Analyze the effect of flow velocity change on the location of the separation point when the angle of attack is fixed. (refer to boundary layer characteristics of laminar and turbulent flow)
    9) Investigate some methods to increase the lift value.
    10) Suggest ways to improve the design of equipment related to the theory learned in this experiment

    ๋ณธ๋ๅฉ๋‚ด์šฉ

    1) Observe and record various streamline of the figures through observing the visualization glass.
    1-1) Analyze the relation between the angle of attack and the variation of a separation point at the airfoil.
    ๋‘ ๊ฒฝ์šฐ ๋ชจ๋‘ Airfoil์˜ ๋ฐ›์Œ๊ฐ(Angle of Attack, ์ดํ•˜ AOA)์ด ์ฆ๊ฐ€ํ•จ์— ๋”ฐ๋ผ ๋ฐ•๋ฆฌ์ (Seperation point)์ด ์•ž์— ํ˜•์„ฑ๋˜๋Š” ๊ฒƒ์„ ํ™•์ธํ•  ์ˆ˜ ์žˆ๋‹ค. ๋˜ํ•œ ๋ฐ›์Œ๊ฐ์ด ์ž„๊ณ„์ ์„ ์ง€๋‚  ๊ฒฝ์šฐ, ๋ฐ•๋ฆฌ ํ˜„์ƒ์ด ๋งค์šฐ ์ด๋ฅด๊ฒŒ ๋ฐœ์ƒํ•ด ์‹ค์†(Stall) ํ˜„์ƒ์ด ์ผ์–ด๋‚˜๋Š” ๊ฒƒ์„ ํ™•์ธํ•  ์ˆ˜ ์žˆ๋‹ค. ๊ฐ™์€ AOA = 30ยฐ์—์„œ ๋น„๊ตํ•  ๋•Œ moderate speed๋ณด๋‹ค fast speed case์—์„œ ํ›„๋ฅ˜(Wake)๊ฐ€ ๋”์šฑ ํ™œ๋ฐœํžˆ ์ผ์–ด๋‚˜๋Š” ๊ฒƒ๋„ ํ™•์ธํ•  ์ˆ˜ ์žˆ๋‹ค.

    1-2) Analyze the vortex shedding phenomenon.
    ์œ„ ๊ทธ๋ฆผ์—์„œ ์•Œ ์ˆ˜ ์žˆ๋“ฏ, fast speed์—์„œ๋Š” airfoil ๋’ค๋กœ ํ›„๋ฅ˜(Wake)๊ฐ€ ๋ฐœ์ƒํ•œ๋‹ค. ์ด๋•Œ ๋งˆ์น˜ ์†Œ์šฉ๋Œ์ด์™ฟ’ ๊ฐ™์€ ์™ฟ’๋ฅ˜(Vortex) ํ˜„์ƒ์ด ์ผ์–ด๋‚˜๋Š”๋ฐ, ์ด์ฒ˜๋Ÿผ ์™ฟ’๋ฅ˜๊ฐ€ ๋ฌผ์ฒด ํ›„๋ฅ˜๋กœ ๋ฐฉ์ถœ๋˜๋Š” ํ˜„์ƒ์„ Vortex shedding phenomenon์ด๋ผ๊ณ  ํ•œ๋‹ค

    2) What is curvature effect of the external flow?
    ๊ฒฝ๊ณ„์ธต(Boundary layer)์—์„œ์˜ ์†๋„ ํ”„๋กœํŒŒ์ผ์€ ์—์–ดํฌ์ผ์˜ ์„ ๋‘ ๊ทผ์ฒ˜์—์„œ ๋‚˜ํƒ€๋‚œ๋‹ค. ์ด๋•Œ ๊ฒฝ๊ณ„์ธต ๋ฐ”๋กœ ๋ฐ”๊นฅ์—์„œ ๊ธ‰๊ฒฉํ•œ ์†๋„ ๊ฐ•ํ•˜๊ฐ€ ๋‚˜ํƒ€๋‚˜๋Š”๋ฐ, ์ด ๊ฒฝ์šฐ์—๋Š” ์ผ๋ฐ˜์ ์ธ ๊ฒฝ๊ณ„์ธต ์ด๋ก ์„ ํ†ตํ•ด ๊ฒฝ๊ณ„์ธต์˜ ๋งค๊ฐœ๋ณ€์ˆ˜๋ฅผ ๊ณ„์‚ฐํ•˜๋Š” ๊ฒƒ์ด ๋ถˆ๊ฐ€๋Šฅํ•ด์ง„๋‹ค. ์™ธ๋ถ€ ์œ ๋™์˜ ํ‘œ๋ฉด์—์„œ ๊ฐ•ํ•œ curvature effect๊ฐ€ ๋‚˜ํƒ€๋‚˜๊ธฐ ๋•Œ๋ฌธ์ด๋‹ค. ๋˜ํ•œ, ์œ ์ฒด๋Š” ํฐ ๊ณก๋ฅ ์„ ๊ฐ€์ง€๋Š” Airfoil์„ ํ†ต๊ณผํ•  ๋•Œ ๋‚ฎ์€ ์••๋ ฅ์ด ํ˜•์„ฑ๋˜๋Š”๋ฐ, ๊ณก๋ฅ ์ด ํฐ(๋ณผ๋กํ•œ) ๊ตฌ๊ฐ„์„ ์ง€๋‚  ๋•Œ๋Š” ๊ณ ์ฐจ์›์˜ ๊ฒฝ๊ณ„์ธต ์ด๋ก ์ด ํ•„์š”ํ•˜๋‹ค.

    ์ฐธ๊ณ ์ž๋ฃŒ

    ยท ์—†์Œ
  • Easy Ai ์š”์•ฝ

    ์ด ๋ฌธ์„œ๋Š” Smoke Tunnel Experiment์™ฟ’ Wind Tunnel Experiment๋ฅผ ํ†ตํ•ด ์—์–ดํฌ์ผ ์ฃผ๋ณ€์˜ ์œ ๋™ ํ˜„์ƒ์„ ๊ด€์ฐฐํ•˜๊ณ  ๋ถ„์„ํ•œ ๊ฒฐ๊ณผ๋ฅผ ๋ณด๊ณ ํ•˜๊ณ  ์žˆ๋‹ค. ๋จผ์ € Smoke Tunnel Experiment์—์„œ๋Š” ๋ฐ›์Œ๊ฐ ๋ณ€ํ™”์— ๋”ฐ๋ฅธ ๋ฐ•๋ฆฌ์  ์ด๋™๊ณผ ์™ฟ’๋ฅ˜ ๋ฐœ์ƒ ํ˜„์ƒ, ๊ณก๋ฅ  ํšจ๊ณผ ๋“ฑ์„ ๊ด€์ฐฐํ•˜๊ณ  ์„ค๋ช…ํ•˜์˜€๋‹ค. ๋˜ํ•œ ์‹ค์† ํ˜„์ƒ ๋ฐœ์ƒ ๋ฉ”์ปค๋‹ˆ์ฆ˜๊ณผ 3์ฐจ์› ์—์–ดํฌ์ผ ์ฃผ๋ณ€์˜ ์œ ๋™ ํŠน์„ฑ, ์œ ์„ ๊ณผ ์œ ๋™ํ•จ์ˆ˜์— ๋Œ€ํ•ด ๋‹ค๋ฃจ์—ˆ๋‹ค. ์ด์–ด์„œ Wind Tunnel Experiment์—์„œ๋Š” ์œ ์† ๋ณ€ํ™”์— ๋”ฐ๋ฅธ ์–‘๋ ฅ ๋ฐ ํ•ญ๋ ฅ ๊ณ„์ˆ˜์˜ ๋ณ€ํ™”๋ฅผ ์ธก์ •ํ•˜๊ณ , ๋ฐ›์Œ๊ฐ์— ๋”ฐ๋ฅธ ์–‘๋ ฅ ๋ฐ ํ•ญ๋ ฅ ๊ณ„์ˆ˜์˜ ๋ณ€ํ™” ์–‘์ƒ์„ ๋ถ„์„ํ•˜์˜€๋‹ค. ํŠนํžˆ ๋ฐ›์Œ๊ฐ ์ฆ๊ฐ€์™ฟ’ ๊ฐ์†Œ์— ๋”ฐ๋ฅธ ์‹ค์† ํ˜„์ƒ ๋ฐœ์ƒ ์ง€์ ์˜ ์ฐจ์ด๋ฅผ ์—”ํŠธ๋กœํ”ผ ๊ด€์ ์—์„œ ์„ค๋ช…ํ•˜์˜€๋‹ค. ๋งˆ์ง€๋ง‰์œผ๋กœ ์–‘๋ ฅ ์ฆ๊ฐ€ ๋ฐฉ์•ˆ๊ณผ ์‹คํ—˜ ์žฅ์น˜ ๊ฐœ์„  ๋ฐฉ์•ˆ์„ ์ œ์‹œํ•˜์˜€๋‹ค. ์ „๋ฐ˜์ ์œผ๋กœ ์‹คํ—˜ ๊ฒฐ๊ณผ์™ฟ’ ์ด๋ก ์  ๋ฐฐ๊ฒฝ์„ ์ฒด๊ณ„์ ์œผ๋กœ ์—ฐ๊ณ„ํ•˜์—ฌ ์„ค๋ช…ํ•˜๊ณ  ์žˆ์œผ๋ฉฐ, ์‹คํ—˜ ์žฅ์น˜ ๊ฐœ์„  ๋ฐฉ์•ˆ๋„ ๊ตฌ์ฒด์ ์œผ๋กœ ์ œ์•ˆํ•˜๊ณ  ์žˆ์–ด ์œ ์šฉํ•œ ๋ณด๊ณ ์„œ๋ผ๊ณ  ํ•  ์ˆ˜ ์žˆ๋‹ค.
  • ์ž๋ฃŒํ›„๊ธฐ

      Ai ๋ฆฌ๋ทฐ
      ์‹คํ—˜ ๊ฒฐ๊ณผ๋ฅผ ์ฒด๊ณ„์ ์œผ๋กœ ๋ถ„์„ํ•˜๊ณ  ์ด๋ก ์  ๋ฐฐ๊ฒฝ์„ ๋ฐ”ํƒ•์œผ๋กœ ํ˜„์ƒ์„ ์„ค๋ช…ํ•˜์˜€์œผ๋ฉฐ, ์‹คํ—˜ ์žฅ์น˜ ๊ฐœ์„  ๋ฐฉ์•ˆ์„ ๊ตฌ์ฒด์ ์œผ๋กœ ์ œ์‹œํ•˜๊ณ  ์žˆ๋‹ค.
    • ์ž์ฃผ๋ฌป๋Š”์งˆ๋ๅฉ์˜ ๋‹ต๋ณ€์„ ํ™•์ธํ•ด ์ฃผ์„ธ์š”

      ํ•ดํ”ผ์บ ํผ์Šค FAQ ๋”๋ต–๊ธฐ

      ๊ผญ ์•Œ์•„์ฃผ์„ธ์š”

      • ์ž๋ฃŒ์˜ ์ •๋ณด ๋ฐ ๋‚ด์šฉ์˜ ์ง„์‹ค์„ฑ์— ๋Œ€ํ•˜์—ฌ ํ•ดํ”ผ์บ ํผ์Šค๋Š” ๋ณด์ฆํ•˜์ง€ ์•Š์œผ๋ฉฐ, ํ•ด๋‹น ์ •๋ณด ๋ฐ ๊ฒŒ์‹œ๋ฌผ ์ €์ž‘๊ถŒ๊ณผ ๊ธฐํƒ€ ๋ฒ•์  ์ฑ…์ž„์€ ์ž๋ฃŒ ๋“ฑ๋ก์ž์—๊ฒŒ ์žˆ์Šต๋‹ˆ๋‹ค.
        ์ž๋ฃŒ ๋ฐ ๊ฒŒ์‹œ๋ฌผ ๋‚ด์šฉ์˜ ๋ถˆ๋ฒ•์  ์ด์šฉ, ๋ฌด๋‹จ ์ „์žฌโˆ™๋ฐฐํฌ๋Š” ๊ธˆ์ง€๋˜์–ด ์žˆ์Šต๋‹ˆ๋‹ค.
        ์ €์ž‘๊ถŒ์นจํ•ด, ๋ช…์˜ˆํ›ผ์† ๋“ฑ ๋ถ„์Ÿ ์š”์†Œ ๋ฐœ๊ฒฌ ์‹œ ๊ณ ๊ฐ๋น„๋ฐ”์นด์ง€๋…ธ Viva์˜ ์ €์ž‘๊ถŒ์นจํ•ด ์‹ ๊ณ ๋น„๋ฐ”์นด์ง€๋…ธ Viva๋ฅผ ์ด์šฉํ•ด ์ฃผ์‹œ๊ธฐ ๋ฐ”๋ž๋‹ˆ๋‹ค.
      • ํ•ดํ”ผ์บ ํผ์Šค๋Š” ๊ตฌ๋งค์ž์™ฟ’ ํŒ๋งค์ž ๋ชจ๋‘๊ฐ€ ๋งŒ์กฑํ•˜๋Š” ์„œ๋น„์Šค๊ฐ€ ๋˜๋„๋ก ๋…ธ๋ ฅํ•˜๊ณ  ์žˆ์œผ๋ฉฐ, ์•„๋ž˜์˜ 4๊ฐ€์ง€ ์ž๋ฃŒํ™˜๋ถˆ ์กฐ๊ฑด์„ ๊ผญ ํ™•์ธํ•ด์ฃผ์‹œ๊ธฐ ๋ฐ”๋ž๋‹ˆ๋‹ค.
        ํŒŒ์ผ์˜ค๋ฅ˜ ์ค‘๋ณต์ž๋ฃŒ ์ €์ž‘๊ถŒ ์—†์Œ ์„ค๋ช…๊ณผ ์‹ค์ œ ๋‚ด์šฉ ๋ถˆ์ผ์น˜
        ํŒŒ์ผ์˜ ๋‹ค์šด๋กœ๋“œ๊ฐ€ ์ œ๋Œ€๋กœ ๋˜์ง€ ์•Š๊ฑฐ๋‚˜ ํŒŒ์ผํ˜•์‹์— ๋งž๋Š” ํ”„๋กœ๊ทธ๋žจ์œผ๋กœ ์ •์ƒ ์ž‘๋™ํ•˜์ง€ ์•Š๋Š” ๊ฒฝ์šฐ ๋‹ค๋ฅธ ์ž๋ฃŒ์™ฟ’ 70% ์ด์ƒ ๋‚ด์šฉ์ด ์ผ์น˜ํ•˜๋Š” ๊ฒฝ์šฐ (์ค‘๋ณต์ž„์„ ํ™•์ธํ•  ์ˆ˜ ์žˆ๋Š” ๊ทผ๊ฑฐ ํ•„์š”ํ•จ) ์ธํ„ฐ๋„ท์˜ ๋‹ค๋ฅธ ์‚ฌ์ดํŠธ, ์—ฐ๊ตฌ๊ธฐ๊ด€, ํ•™๊ป“, ์„œ์  ๋“ฑ์˜ ์ž๋ฃŒ๋ฅผ ๋„์šฉํ•œ ๊ฒฝ์šฐ ์ž๋ฃŒ์˜ ์„ค๋ช…๊ณผ ์‹ค์ œ ์ž๋ฃŒ์˜ ๋‚ด์šฉ์ด ์ผ์น˜ํ•˜์ง€ ์•Š๋Š” ๊ฒฝ์šฐ

    ํ•จ๊ป˜ ๊ตฌ๋งคํ•œ ์ž๋ฃŒ๋„ ํ™•์ธํ•ด ๋ณด์„ธ์š”!

    ๋ฌธ์„œ ์ดˆ์•ˆ์„ ์ƒ์„ฑํ•ด์ฃผ๋Š” EasyAI
    ์•ˆ๋…•ํ•˜์„ธ์š”. ํ•ดํ”ผ์บ ํผ์Šค์˜ ๋ฐฉ๋Œ€ํ•œ ์ž๋ฃŒ ์ค‘์—์„œ ์„ ๋ณ„ํ•˜์—ฌ ๋‹น์‹ ๋งŒ์˜ ์ดˆ์•ˆ์„ ๋งŒ๋“ค์–ด์ฃผ๋Š” EasyAI ์ž…๋‹ˆ๋‹ค.
    ์ €๋Š” ์•„๋ž˜์™ฟ’ ๊ฐ™์ด ์ž‘์—…์„ ๋„์™ฟ’๋“œ๋ฆฝ๋‹ˆ๋‹ค.
    - ์ฃผ์ œ๋งŒ ์ž…๋ ฅํ•˜๋ฉด ๋ชฉ์ฐจ๋ถ€ํ„ฐ ๋ณธ๋ๅฉ๋‚ด์šฉ๊นŒ์ง€ ์ž๋™ ์ƒ์„ฑํ•ด ๋“œ๋ฆฝ๋‹ˆ๋‹ค.
    - ์žฅ๋ฌธ์˜ ์ฝ˜ํ…์ธ ๋ฅผ ์‰ฝ๊ณ  ๋น ๋ฅด๊ฒŒ ์ž‘์„ฑํ•ด ๋“œ๋ฆฝ๋‹ˆ๋‹ค.
    - ์Šคํ† ์–ด์—์„œ ๋ฌด๋ฃŒ ์บ์‹œ๋ฅผ ๊ณ„์ •๋ณ„๋กœ 1ํšŒ ๋ฐœ๊ธ‰ ๋ฐ›์„ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. ์ง€๊ธˆ ๋ฐ”๋กœ ์ฒดํ—˜ํ•ด ๋ณด์„ธ์š”!
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