本文選題：風流溫度 + 不穩(wěn)定換熱系數(shù)　； 參考：《安徽理工大學》2013年碩士論文

【摘要】：隨著煤炭工業(yè)的發(fā)展和機械化程度的不斷提高,煤礦采深逐年增加,而礦井熱害也越來越嚴重。礦井熱害會給井下作業(yè)人員的健康和煤礦的安全生產(chǎn)帶來很大的威脅。對礦井內(nèi)風流而言,其熱源有多種,如圍巖散熱、機電設(shè)備散熱、礦物氧化放熱等,而圍巖散熱是最重要的熱源之一,研究圍巖與風流間的熱濕交換機理和規(guī)律,對于提高礦井熱參數(shù)預(yù)測能力、防治礦井熱害具有重要意義。 本論文通過對井巷圍巖與風流間熱濕交換相關(guān)理論的學習和分析研究,基于不穩(wěn)定換熱系數(shù)建立了圍巖與風流間的熱交換模型。結(jié)合兩組現(xiàn)場實測數(shù)據(jù)在計算軟件Mathematica環(huán)境下分析了相關(guān)參數(shù)對于風流溫升的影響情況,包括壁面粗糙度、巷道斷面周長、風流質(zhì)量流量、巖石熱導率、風流含濕量等,并對風流含濕量的變化對風流與圍巖間熱交換的影響進行了詳細分析和討論。在FLUENT環(huán)境下,通過建立相應(yīng)的物理模型,分析了數(shù)值模擬方法計算風流與圍巖熱交換的特點。 分析和研究結(jié)果表明壁面粗糙度系數(shù)對風流與圍巖間的熱交換的影響不明顯；巷道斷面周長和巖石的熱導率對熱交換有一定的影響；風流的質(zhì)量流量對熱交換的影響比較明顯,并且風流量減小時風流溫度的升高比風流量增加時風流溫度的降低要顯著；風流含濕量的變化對熱交換的影響最強烈。不適合用數(shù)值模擬的方法進行風溫的預(yù)測和計算。提出也可以采用類似于求解井巷通風阻力的查表法進行井下熱計算。
[Abstract]:With the development of coal industry and the improvement of mechanization degree, the mining depth increases year by year, and the thermal damage of coal mine is more and more serious. Mine thermal hazard will bring great threat to the health of underground operators and the safety of coal mine production. For the air flow in mine, there are many heat sources, such as heat dissipation of surrounding rock, heat dissipation of electromechanical equipment, oxidation heat release of minerals, etc. The heat dissipation of surrounding rock is one of the most important heat sources. The heat and moisture exchange mechanism and law between surrounding rock and air flow are studied. It is of great significance to improve the prediction ability of mine thermal parameters and prevent mine thermal damage. Based on the study and analysis of the theory of heat and moisture exchange between surrounding rock and wind flow, a heat exchange model between surrounding rock and air flow is established based on the unstable heat transfer coefficient. Combined with two groups of field measured data, the influence of related parameters on air flow temperature rise is analyzed under the environment of Mathematica software, including wall roughness, tunnel section circumference, air flow mass flow, rock thermal conductivity, wind flow moisture content and so on. The influence of the moisture content of wind flow on the heat exchange between wind flow and surrounding rock is analyzed and discussed in detail. The characteristics of numerical simulation method for calculating heat exchange between wind flow and surrounding rock are analyzed by establishing the corresponding physical model in FLUENT environment. The results show that the influence of wall roughness coefficient on the heat exchange between wind flow and surrounding rock is not obvious, the circumference of roadway section and the thermal conductivity of rock have certain influence on heat exchange, and the influence of air flow mass flow on heat exchange is obvious. When the wind flow decreases, the increase of the air flow temperature is more significant than that of the air flow temperature when the wind flow decreases, and the change of the wind moisture content has the strongest effect on the heat exchange. It is not suitable to predict and calculate the wind temperature by numerical simulation. It can also be used to calculate underground heat by using table checking method similar to solving ventilation resistance of shaft and roadway.
【學位授予單位】：安徽理工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TD727.2

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