Basing on the theory of two-phase flow of gas and solid, and the characteristics of coal mine driving working face , using the discrete phase models of computational fluid mechanics to simulate the dust concentration during the ventilation process of coal drift driving with exhaust ventilation.

根據(jù)氣固兩相流理論手机看片日韩毛片免费看，針對礦井掘進工作面的特點，采用計算流體力學的離散相模型對掘進工作面通風過程中粉塵濃度進行數(shù)值模擬，總結抽出式通風掘進巷道中粉塵濃度的沿程分布及變化規(guī)律九九久久久免费毛片基地。

Rectangular and unstructured hybrid grids, re-normalization group k-ε turbulence model and discrete ordinates radiation model were adopt for the steady-state numerical calculation of air velocity filed and temperature filed, and obtained the distribution of air flow velocity and temperature in the passenger compartment.

采用矩形與非結構混合網(wǎng)格湖南毛片、RNGκ-ε兩方程湍流模型、DO輻射模型對車室內(nèi)的空氣速度場及溫度場進行了穩(wěn)態(tài)數(shù)值模擬計算看免费5XXAAA毛片中国，獲得了車室內(nèi)空氣流速及溫度的分布情況高清无码免费在线观看视频。

In calculation, it was assumed that nozzle flow was frozen, and convective and radiative heat transfer from gas to nozzle wall was considered. Governing equations were discretized with second order upstream scheme and radiative heat transfer equation was solved with Discrete Ordinates method.

在計算中，假定噴管流動為凍結流動国产A片地址一，考慮燃氣向壁面的對流換熱和輻射換熱一级黄色视频看看；采用二階迎風格式離散控制方程，采用DO模型離散求解輻射換熱方程久久人妻Av无码中文字幕第一，水蒸氣的吸收系數(shù)根據(jù)Leckner公式計算精品国产很色很爽色多多。

Nozzle flow was assumed to be frozen, and convective and radiative heat transfer from gas to solid wall was considered. Discretization of the governing equations was performed with two order upstream scheme, and radiative heat transfer equation was solved with Discrete Ordinates method. Absorption coefficient of water vapor was calculated by Leckner formula.

計算中，假定塞式噴管中的流動為凍結流動韩国AV永久免费不卡在线，考慮燃氣向壁面的對流換熱和輻射換熱aigao网站进入入口；采用二階迎風格式離散控制方程，及DO模型離散求解輻射換熱方程菠萝在线成人网站免费观看网址大全，水蒸氣的吸收系數(shù)根據(jù)Leckner公式計算日韩一级AAAA免费视频。

In chapter 2, the mathematical model which governs the flow in non-circular crosssection channel is established, FEM is used to discrete the equations.

為工程實際中設計和選擇異形斷面流道提供依據(jù)。