本文選題：燃機(jī)冷卻 + 凹陷��； 參考：《上海交通大學(xué)》2015年碩士論文

【摘要】：提高燃?xì)廨啓C(jī)出功的一重要途徑是提高燃?xì)鉁囟?而燃?xì)鉁囟鹊奶岣邔?duì)葉片等受熱材料的熱性能有更好的要求,因此發(fā)展更有效的冷卻結(jié)構(gòu)已經(jīng)成為燃?xì)廨啓C(jī)研發(fā)技術(shù)的瓶頸之一。而凹陷結(jié)構(gòu)的突出優(yōu)點(diǎn)是在提高傳熱效果的同時(shí)又可以避免過(guò)大的壓力損失,因此在將來(lái)燃?xì)廨啓C(jī)內(nèi)部冷卻中具有很好的應(yīng)用前景。本文的主要工作是通過(guò)數(shù)值計(jì)算對(duì)凹陷內(nèi)的流動(dòng)和傳熱進(jìn)行準(zhǔn)確模擬并與實(shí)驗(yàn)相驗(yàn)證,根據(jù)計(jì)算結(jié)果對(duì)不同凹陷的流動(dòng)和傳熱情況進(jìn)行了深入分析比較。具體如下:利用穩(wěn)態(tài)模型數(shù)值計(jì)算模擬研究了球形,橢球型,傾斜橢球型和淚滴型四種不同形狀凹陷的流動(dòng)和傳熱性能;比較了帶肋球形凹陷和不帶肋球形凹陷的傳熱和流動(dòng)效果并研究了肋高度對(duì)流動(dòng)和傳熱的影響;比較了前倒圓和全倒圓與對(duì)應(yīng)球形凹陷的流動(dòng)和傳熱區(qū)別;探究了凹陷深度對(duì)流動(dòng)和傳熱的影響。研究結(jié)果表明:在雷諾數(shù)分別為8500,18700,36700,50500,60000下,四種不同形狀凹陷中淚滴型凹陷的換熱效果最好,雖然其摩擦阻力也最大,而且淚滴型凹陷的綜合熱性能也最好;1.0mm的帶肋凹陷換熱比球形凹陷高出30%-40%,摩擦因子比球形凹陷高出80%左右;肋高對(duì)凹陷的流動(dòng)和傳熱有一定影響,隨著肋高的增加凹陷傳熱有所增強(qiáng),但摩擦阻力也顯著增大;前倒圓的換熱情況比球形凹陷略高3%左右,傳熱分布比球形凹陷均勻且摩擦阻力明顯更小。全倒圓換熱比球略低2%左右,但摩擦阻力最小,綜合熱性能最好。深度對(duì)凹陷傳熱影響,隨著深度增加球形凹陷換熱越強(qiáng),摩擦阻力損失越大,從綜合熱性能參數(shù)來(lái)看凹陷深度為2mm的球形凹陷綜合熱性能最好。
[Abstract]:An important way to increase the output power of gas turbine is to raise the gas temperature, and the increase of gas temperature has better requirements for the thermal performance of heated materials such as blades. Therefore, the development of more effective cooling structure has become one of the bottlenecks of gas turbine research and development technology. The outstanding advantage of the concave structure is that it can not only improve the heat transfer effect but also avoid excessive pressure loss, so it has a good application prospect in the future gas turbine internal cooling. The main work of this paper is to simulate accurately the flow and heat transfer in the sag by numerical calculation and to verify the experimental results. The flow and heat transfer in different sag are analyzed and compared according to the calculation results. The main contents are as follows: the flow and heat transfer characteristics of four kinds of hollow with different shape are studied by numerical simulation of steady state model, such as spherical, ellipsoid, inclined ellipsoid and tear droplet. The effects of heat transfer and flow in the spherical sag with and without ribs are compared, and the influence of rib height on the flow and heat transfer is studied, and the difference between the flow and heat transfer in the front inverted circle and the full inverted circle is compared with that in the corresponding spherical depression. The effect of indentation depth on flow and heat transfer was investigated. The results show that the heat transfer efficiency of the tear drop type sag is the best in the four different shapes of the sag, even though the friction resistance is the largest, at the Reynolds number of 18700 ~ 36700 ~ 50500 ~ (60 000), respectively. Moreover, the comprehensive thermal properties of tear-drop type sag are better than that of spherical sag, the heat transfer of 1.0 mm ribbed sag is 30-40% higher than that of spherical sag, the friction factor is about 80% higher than that of spherical sag, and the rib height has certain influence on the flow and heat transfer of the sag. With the increase of rib height, the heat transfer of the depression increases, but the friction resistance also increases significantly, the heat transfer of the front inverted circle is slightly higher about 3% than that of the spherical sag, and the heat transfer distribution is more uniform than that of the spherical sag and the friction resistance is obviously smaller than that of the spherical depression. The total reverse circle heat transfer is about 2% lower than that of the ball, but the friction resistance is the least, and the comprehensive thermal performance is the best. The effect of depth on the heat transfer of the sag, the stronger the heat transfer of the spherical sag with the increase of the depth, the greater the friction resistance loss, and the better the comprehensive thermal performance of the spherical sag with the depth of 2mm from the point of view of the comprehensive thermal performance parameters.
【學(xué)位授予單位】：上海交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TK471

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