air contrast study 中文意思是什麼
air contrast study
解釋
空氣對比檢查-
According to thermal state similitude model experiment of the langya mountain hydropower station, we adopt different velocity of air ventilation and exclude air proportion of upriver and downriver, this paper contrast the air distribution of the dynamo floor on each method, and educe the best projects of arch crest supply air that adapt to langya mountain hydropower station ’ s dynamo floor : g = 17. 4 10 ~ 4m ~ 3 / h, 22 vents, d = 600mm, the scale of volume 1 : 3, t0 = 16. 9. it ’ s also thought that improved any side of volume can reduce its temperature. when study on the air supply of langya mountain hydropower station ’ s underground dynamo floor by cfd software, it proved that cfd software is correct when compare with model experiment. when arrange the number of 5 kinds of vents, it concluded that the number of vents 14 to 22, it can ’ t change velocity, in 36 to 40 can lead to reduction of velocity. when vent in 14 to 36, the parameter kt doesn ’ t change, when the number is as large as 36, kt reduces
在此基礎上，模擬了5種風口布置方案和送風量的改變對發電機層溫度場和速度場的影響，獲得了些可供參考的結論:在風量和送風速度不變的條件下，風口個數在（ 14 ~ 22 ）小范圍變化時，工作區平均風速基本不變，大幅度增加風口個數（ 36 ~ 44 ）就會導致工作區平均風速的降低，風口數在14 ~ 36之間對工作區的溫度不均勻系數影響不大，當風口數> 36時，溫度不均勻系數隨著風口數的增多而變小，速度不均勻系數一直隨著風口數的增加而減少;在風口布置和尺寸不變的情況下，送風量變化時，工作區平均溫度隨送風量增大而降低，平均溫度的降低量逐漸趨于減少，能量利用系數先是隨著送風量的增加而增大，后隨送風量增加而減少。 -
As far as daily surface air mean temperature, rmsie is below 0. 5ctc. as for daily surfac e air max and min temperature, the rmsie are respectively lower than 0. 74 and 0. 58. ( 4 ) the model a takes into account the fact that temperature lapse rate changes according to such factors as topography, latitude, longitude and moisture transfer, etc. the effect of spatial interpolation that uses it is not noticeably ameliorated by contrast with using the model a. there remains a need for further study
其中，改進方案a與其它方法相比，效果較好，其me均在0 . 03以下，對于地面日平均氣溫場， rmsie均在0 . 50以下，對于表面大氣日最高溫度場， rmsie均在0 . 74以下，對于地面日最低氣溫場， rmsie均在0 . 58以下；在方案a的基礎上，考慮溫度直減率隨經、緯度和地形以及水汽輸送等因素變化的分區插值方案，與方案a比較，插值效果沒有明顯改善，因此還需要進一步的研究。
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