本文選題：場協(xié)同原理　切入點：無量綱參數(shù)N_0　出處：《湘潭大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：能源在如今的生活及社會發(fā)展中起著舉足輕重的作用,所以能源對于人們的意義非常重大,但是地球資源日益減少,所以對于提高能源利用率的要求迫在眉睫.強化換熱技術(shù)為了現(xiàn)代工業(yè)的需求,不斷縮小換熱設(shè)備的重量和體積,并且仍然可以使換熱設(shè)備的效率大大提高,故在工業(yè)界以及科技節(jié)備受重視.但是已經(jīng)廣泛應(yīng)用的受迫流動強化傳熱技術(shù)都存在強化換熱的同時功耗增加更多的問題.本文為了尋找較好的強化換熱管型,對圓管、橢圓管和滴型管三種不同管型的管外空氣側(cè)的流動進行數(shù)值模擬.比較三種強化換熱管的換熱性能的優(yōu)劣,得出滴型管的流動與傳熱綜合性能較優(yōu),橢圓管次之,圓管較差的結(jié)論,并利用場協(xié)同原理對模擬結(jié)果進行分析,驗證了模擬結(jié)果的正確性.根據(jù)換熱性能分析標(biāo)準(zhǔn)定義了新的換熱與流動評價標(biāo)準(zhǔn),無量綱參數(shù)N0來綜合評價換熱表面的強化傳熱效果,得出和場協(xié)同原理相似的結(jié)論.并對清華大學(xué)提出的交叉縮放橢圓管進行數(shù)值模擬,改變交叉縮放橢圓管的特定尺寸參數(shù),以傳統(tǒng)評價標(biāo)準(zhǔn)PEC,在交叉縮放橢圓管之間進行橫向?qū)Ρ?確定換熱最優(yōu)尺寸.以場協(xié)同原理為指導(dǎo)思想,分析縱向渦對速度與溫度梯度協(xié)同角的影響,推導(dǎo)出新型的協(xié)同角表達(dá)式.從溫度場、速度場和壓力場三個方面出發(fā)分析交叉縮放橢圓管換熱機理,總結(jié)換熱特點,指出交叉縮放橢圓管換熱效果良好的原因.在本文中,用場協(xié)同原理對數(shù)值模擬中出現(xiàn)的現(xiàn)象進行理論分析.從數(shù)值模擬結(jié)果和理論分析兩方面出發(fā)進行比較,得出合理結(jié)論.
[Abstract]:Energy plays an important role in today's life and social development, so energy is of great significance to people, but the earth's resources are decreasing day by day. So it is urgent to improve the energy efficiency. For the sake of the demand of modern industry, the weight and volume of heat exchanger can be reduced continuously, and the efficiency of heat exchanger can be greatly improved. Therefore, great attention has been paid to the industry and science and technology section. However, the forced flow enhancement heat transfer technology, which has been widely used, has the problem of enhancing heat transfer and increasing power consumption. In order to find a better type of enhanced heat transfer pipe, this paper deals with the circular tube. Numerical simulation of the flow around the air side of the tube with three different types of elliptical tube and droplet tube is carried out. By comparing the heat transfer performance of the three enhanced heat transfer tubes, it is concluded that the flow and heat transfer performance of the droplet tube is better than that of the elliptical tube. The conclusion that the tube is worse and the simulation results are analyzed by using the field synergy principle, the correctness of the simulation results is verified. According to the heat transfer performance analysis standard, a new evaluation standard for heat transfer and flow is defined. The dimensionless parameter N0 is used to synthetically evaluate the heat transfer enhancement effect of the heat transfer surface, and the conclusion is similar to that of the field synergy principle. The numerical simulation of the cross scaled elliptic tube proposed by Tsinghua University is carried out to change the specific dimension parameters of the cross scaled elliptic tube. Based on the traditional evaluation standard PECs, the transverse comparison between cross-scaled elliptical tubes is carried out to determine the optimal size of heat transfer. Based on the principle of field synergy, the influence of longitudinal vortices on the synergistic angle between velocity and temperature gradient is analyzed. In this paper, the heat transfer mechanism of cross scaled elliptic tube is analyzed from three aspects: temperature field, velocity field and pressure field. The heat transfer characteristics of cross scaled elliptical tube are summarized, and the reason for the good heat transfer effect of cross scaled elliptic tube is pointed out. The phenomena in numerical simulation are analyzed theoretically by using the principle of field cooperation, and the reasonable conclusions are drawn by comparing the results of numerical simulation and theoretical analysis.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TK172

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本文編號：1574625