CFX 01/07 HTGR

Pebble bed

Total Volume

(m3)

Heat Source

(W/m3)

Total Power

(W)

Multi-Pointk -ε model 0.001747864 6.32*106 1.104*104

RSM model 0.001805235 6.32*106 1.141*104

Single-Pointk -ε model 0.001827699 6.04*106 1.104*104

RSM model 0.001828511 6.23*106 1.141*104

檢驗 _1

理論半徑(m)

模擬半徑(m)

誤差(％ )

Multi-Pointk -ε model 0.025 0.0247427 1.021

RSM model 0.025 0.0248796 0.486

Single-Pointk -ε model 0.025 0.0249819 0.0724

RSM model 0.025 0.0249856 0.0576

檢驗 _2

Contours of velocity (m/s)

Multi-point Single-point

Contours of temperature (K)

Multi-point Single-point

Contours of Temperature (K)

Multi-point Single-point

Vectors of Velocity (m/s)

Multi-point Single-point

Contours of Tur. intensity

Multi-point Single-point

Vectors of Velocity (m/s)

Multi-point Single-point

Nusselt number (Nu)

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180

Z en ith an g le v a ria tio n (F)

0

100

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Nus

eelt

num

ber (

Nu)

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180

Z en ith an g le v a ria tio n (F)

0

100

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Nus

selt

num

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Nu)

Multi-point Single-point

整體架構 _ 1 模式

速度溫度(固 )

渦流

紊流

溫度(流 )

Multi-Point Single-Point

快

低

弱

小

低

慢

高

強

大

高

熱傳較好

接近接觸點時，流體形成的渦流較大，使熱容易在此區域累積，導致流體溫度提高，與固體之間的△ T變小，浪費了因紊流強而熱傳能力較好。

Multi-Point 的設計，因空間較小，因而影響壓迫到流體的流動。