直接供气预旋转静系的换热
Heat transfer in direct transfer pre-swirl rotor-stator system
-
摘要: 用实验方法研究了直接供气转静系预旋腔内转盘表面的换热情况,得到了转盘表面的局部努塞尔数分布云图、周向平均努塞尔数沿径向的分布以及转盘表面平均努塞尔数随转速和流量的变化规律.实验结果表明:相同流量系数下,旋转雷诺数较低时,主盘面局部努塞尔数的峰值区出现在低半径小分离区的上方,旋转雷诺数较高时,局部努塞尔数的峰值区向高半径移动和扩展,且覆盖的半径范围变宽.相同旋转雷诺数下,流量系数越大,局部努塞尔数的峰值区向低半径移动,其覆盖的半径范围变窄;主盘面的平均努塞尔数与旋转雷诺数或流量系数均呈单调增大关系.Abstract: Heat transfer of direct transfer pre-swirl rotor-stator system was investigated by experiments.Contours of local Nusselt number on the rotating disk,distribution of circumferential-averaged Nusselt number along radial direction,and variation of average Nusselt number with rotating Reynolds number and mass flow rate coefficient were obtained.The results show that with the same mass flow rate and low rotational Reynolds number,peak zones of local Nusselt number arise at small radius.When rotational Reynolds number increases,peak zones of local Nusselt number move to larger radius and expand.With the same rotational Reynolds number,peak zones of local Nusselt number move to smaller radius and their ranges decreases.Average Nusselt number would increase when rotational Reynolds number or mass flow rate coefficient increases.
-
Key words:
- direct transfer system /
- rotor-stator /
- pre-swirl /
- rotating cavity /
- heat transfer
-
[1] Owen J M.Modelling internal air systems in gas turbine engines[J].Journal of Aerospace Power,2007,22(4):505-520. [2] Meierhofer B,Franklin C J.An investigation of a preswirled cooling airflow to a turbine disc by measuring the air temperature in the rotating channels .ASME Paper GT1981-132,1981. [3] El-Oun Z B,Owen J M.Preswirl blade-cooling effectiveness in an adiabatic rotor-stator system[J].Journal of Turbomachinery,1989(111):522-529. [4] Geis T,Dittmann M,Dullenkopf K.Cooling air temperature reduction in a direct transfer preswirl system .ASME Paper GT2003-38231,2003. [5] Chew J W,Ciampoli F,Hills N J,et al.Pre-swirled cooling air delivery system performance .ASME Paper GT2005-6832,2005. [6] Farzaneh-Gord M,Wilson M,Owen J M.Numerical and theoretical study of flow and heat transfer in a pre-swirl rotor-stator system .ASME Paper GT2005-68135,2005. [7] Wilson M,Pilbrow R,Owen J M.Flow and heat transfer in a pre-swirl rotor-stator system[J].Journal of Turbomachinery,1997(119):364-373. [8] Lock G D,Yan Y,Newton P J,et al.Heat transfer measurements using liquid crystals in a preswirl rotating-disk system[J].Journal of Engineering for Gas Turbines and Power,2005(127):375-382. [9] Lock G D,Wilson M,Lock G D,et al.Influence of fluid dynamics on heat transfer in a pre-swirl rotating disc system[J].Journal of Engineering for Gas Turbines and Power,2005(127):791-797. [10] Pilbrow R,Karabay H,Wilson M,et al.Heat transfer in a “cover-plate” preswirl rotating-disk system[J].Journal of Turbomachinery,1999(121):249-256. [11] Karabay H,Pilbrow R,Wilson M,et al.Performance of pre-swirl rotating-disc systems[J].Journal of Engineering for Gas Turbines and Power,2000(122):442-450. [12] Karabay H,Wilson M,Owen J M.Predictions of effect of swirl on flow and heat transfer in a rotating cavity[J].International Journal of Heat and Fluid Flow,2001(22):143-155. [13] Karabay H,Wilson M,Owen J M.Approximate solutions for flow and heat transfer in pre-swirl rotating-disc systems .ASME Paper GT2001-200,2001. [14] 王锁芳,朱强华,栾海峰,等.高位预旋进气转静系盘腔换热实验[J].航空动力学报,2007,22(8):1216- 1221. WANG Suofang,ZHU Qianghua,LUAN Haifeng,et al.Experimental study on heat transfer in rotor-stator cavity with high-positioned pre-swirl inflow[J].Journal of Aerospace Power,2007,22(8):1216-1221.(in Chinese) [15] 曾军,张剑,黄康才.预旋进气转-静盘腔中的流动和传热数值研究[J].航空动力学报,2008,23(7):1168-1173. ZENG Jun,ZHANG Jian,HUANG Kangcai.Flow and heat transfer investigation in pre-swirl inflow rotor-stator cavity[J].Journal of Aerospace Power,2008,23(7):1168-1173.(in Chinese) [16] 何振威,冯青,刘松龄,等.带盖板预旋进气系统的温降实验误差分析[J].科学技术与工程,2010,(26):6439-6444. HE Zhenwei,FENG Qing,LIU Songlin,et al.The error analysis of an experiment about drop in temp-Erature in a pre-swirl system with a cover-plate[J].Science Technology and Engineering,2010(26):6439-6444.(in Chinese) [17] 朱晓华,刘高文,刘松龄,等.带盖板的预旋系统温降和压力损失数值研究[J].航空动力学报,2010,25(11):2498-2506. ZHU Xiaohua,LIU Gaowen,LIU Songling,et al.Numerical studies of temperature drop and pressure loss in a cover-plate preswirl system[J].Journal of Aerospace Power,2010,25(11):2498-2506.(in Chinese) [18] Ireland P T,Gillespie D R H,Wang Z.Heater element:UK,European Patent,No.0847679 .2000-11-22 . http://www.freepatentsonline.com/EP0847679.html. [19] Newton P J,Yan Y,Stevens N E,et al.Transient heat transfer measurements using thermochronic liquid crystal.Part 1:An improved technique[J].International Journal of Heat and Fluid Flow,2003(24):14-22.
点击查看大图
计量
- 文章访问数: 1738
- HTML浏览量: 4
- PDF量: 775
- 被引次数: 0