發(fā)布時間：2018-06-08 03:29

  本文選題：扭旋葉片 + 扭率變化率�。� 參考：《化工學(xué)報》2016年12期

【摘要】：為探究扭旋葉片的結(jié)構(gòu)參數(shù)——扭率變化率Tv對管道換熱的影響,以水為介質(zhì),在Tv=-5~5范圍內(nèi),采用實驗和數(shù)值模擬方法研究了恒壁溫條件下流體的傳熱和阻力特性,并分析了綜合傳熱性能及強(qiáng)化傳熱機(jī)理。結(jié)果表明,沿流動方向Tv0的扭旋葉片安裝方式強(qiáng)化傳熱效果優(yōu)于Tv=0,研究范圍內(nèi)Tv=2.5時綜合強(qiáng)化傳熱比最高,相對Tv=0平均提高5.0%。而Tv0時強(qiáng)化傳熱效果劣于Tv=0,應(yīng)避免此種葉片安裝方式。扭率的變化影響了流場結(jié)構(gòu),當(dāng)Tv0時,在近1/2流動區(qū)域內(nèi)繞流旋渦的渦量和影響區(qū)域明顯增加,同時,在繞流旋渦流動區(qū)域,壓力、速度和溫度的三場協(xié)同程度得到提高,進(jìn)而強(qiáng)化了換熱管道的傳熱效果。
[Abstract]:In order to investigate the influence of the structural parameter of torsional blade on the heat transfer of the pipe, the heat transfer and resistance characteristics of the fluid under constant wall temperature were studied by means of experiments and numerical simulation methods in the range of Tv-5 with water as the medium. The comprehensive heat transfer performance and enhanced heat transfer mechanism are also analyzed. The results show that the heat transfer enhancement effect of torsion vane mounted along the flow direction is better than that of Tv0. The comprehensive enhanced heat transfer ratio of Tv0 is the highest when Tv0 is 2.5, and the average increase of Tv0 is 5.0. However, the heat transfer enhancement effect of Tv0 is worse than that of Tv0, which should be avoided. The variation of torsion rate affects the structure of the flow field. When Tv0, the vorticity and the influence region increase obviously in nearly 1 / 2 of the flow region, at the same time, the synergy degree of pressure, velocity and temperature is improved in the flow region of the vortex. Furthermore, the heat transfer effect of heat transfer pipe is enhanced.
【作者單位】： 天津大學(xué)化工學(xué)院;沈陽化工大學(xué)高�；せ旌霞夹g(shù)省級重點實驗室;
【基金】：國家自然科學(xué)基金項目(51506133) 遼寧省教育廳一般項目(L2014165)~~
【分類號】：TK124
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本文編號：1994231