真空 ›› 2019, Vol. 56 ›› Issue (5): 30-33.doi: 10.13385/j.cnki.vacuum.2019.05.06
韩宇, 王晓冬, 郭立新, 李翠玲, 王成祥, 张光利
HAN Yu, WANG Xiao-dong, GUO Li-xin, LI Cui-ling, WANG Cheng-xiang, ZHANG Guang-li
摘要： 建立了由喷射器、蒸发器、发生器和冷凝器等组成的蒸汽喷射制冷循环系统。研究了不同的扩压器等直段直径对喷射器抽气性能的影响。当扩压器等直段直径由24mm增加到28mm后,喷射器的引射系数显著增加,喷射器的抽气效率得到了提高,但临界背压降低。分析和讨论了在不同操作参数下扩压器等直段直径对喷射器性能的影响。结果表明,随着工作蒸汽压力的升高,引射系数呈现先升高后下降的变化趋势,在达到0.36MPa时喷射器的引射系数值最大为0.53。当背压值小于临界背压值时喷射器的引射系数保持不变,当背压值大于临界背压值时引射系数减小直至背压为7000Pa时引射系数为0。在一定的操作参数条件下,扩压器等直段直径存在最佳值使喷射器的抽气效率达到最高。
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| [1] Chunnanond K, Aphornratana S.An experimental investigation of a steam ejector refrigerator: the analysis of the pressure profile along the ejector[J]. Applied Thermal Engineering, 2004,24:311-322. [2] 王晓冬,董敬亮,雷宏建,等. 水喷射泵的数值模拟[J]. 真空科学与技术, 2013,33(11):1069-1073. [3] Wang X D, Dong J L, Li A, et al.Numerical Study of Primary Steam Superheating Effects on Steam Ejector Flow and its Pumping Performance[J]. Energy,2014, 78:205-211. [4] Han Y, Wang XD, Sun H, et al.CFD simulation on the boundary layer separation in the steam ejector and its influence on the pumping performance[J]. Energy, 2015,105:697-715. [5] 王晓冬, 付强, 易舒. 蒸汽喷射制冷系统喷射泵工作特性的实验研究[J]. 东北大学学报, 2017,38(12): 1744-1747. (Wang XD, Fu Q, Yi S.Experimental study on the working characteristics of the ejector in steam jet refrigeration system[J]. Journal of Northeastern University, 2017, 38(12):1744-1747.) [6] Li A, Yeoh G.H, Yuen ACY, et al. Numerical Simulation of Condensation Effect on a Steam Ejector by Wet Steam Model[C]. Thirteenth International Conference on Flow Dynamics, Sendai, Miyagi, Japan, 2016,10-12. [7] Li A, Yuen ACY, Chen TBY, et al.Computational Study of Wet Steam Flow to Optimize Steam Ejector Efficiency for Potential Fire Suppression Application[J]. Applied Sciences. 2019,9(7):1486. [8] 仁政. 小型蒸汽喷射实验系统及其性能的研究[D].硕士学位论文,沈阳: 东北大学,2013. (Ren z. Research on Small Steam Injection Experimental System and Its Performance [D]. Shenyang: Northeastern University, 2015.) [9] Bartosiewicz Y, Aidoun Z, Mercadier Y.Numerical assessment of ejector operation for refrigeration applications based on CFD[J], Applied Thermal Engineering, 2006,26:604-612. [10] Sun D W.Variable geometry ejector and their applications in ejector refrigeration systems[J]. Elsevier Science Ltd and IIR, 1996,21(10):919-929. [11] Sriveerakul T, Aphormratana S, Chunnanond K.Performance prediction of steam ejector using computational fluid dynamics[J], International Journal of Thermal Sciences, 2007,46:812-833. [12] Sharifi N, Boroomand M, Kouhikamali R.Wet steam flow energy analysis within thermo-compressors. Stockholm[J], Energy, 2012,(47):609-619. [13] Sharifi N, Boroomand M, Majid S.Numerical assessment of steam nucleation on thermodynamic performance of steam ejectors[J]. Applied Thermal Engineering, 2013,(52):449-459. |
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