CAJ | 학술논문

为提高南极磷虾单船拖网低拖速作业时的网具扩张性能,针对一种立式曲面中空式拖网网板,利用水槽模型试验测得不同迎流冲角状态下的升力系数(CL)、阻力系数(CD)和升阻比(K)。结果表明,CL 和K值随冲角的增大呈先升后降趋势,CD随冲角的增大呈上升趋势；升力系数最大值CLmax =1.436(冲角α=30°),此时CD=0.649,K=2.213,升阻比最大值Kmax =4.671(α=10°),此时CL =0.981,CD =0.210；工作冲角范围为10°~30°时,南极磷虾拖网网板升力系数CL >0.98且升阻比K>2.21。比较不同类型网板的水动力性能,南极磷虾拖网网板具有阻力系数较低、升阻比较高的优点,可为进一步优化南极磷虾拖网网板性能提供参考依据。
위제고남겁린하단선타망저타속작업시적망구확장성능,침대일충입식곡면중공식타망망판,이용수조모형시험측득불동영류충각상태하적승력계수(CL)、조력계수(CD)화승조비(K)。결과표명,CL 화K치수충각적증대정선승후강추세,CD수충각적증대정상승추세；승력계수최대치CLmax =1.436(충각α=30°),차시CD=0.649,K=2.213,승조비최대치Kmax =4.671(α=10°),차시CL =0.981,CD =0.210；공작충각범위위10°~30°시,남겁린하타망망판승력계수CL >0.98차승조비K>2.21。비교불동류형망판적수동력성능,남겁린하타망망판구유조력계수교저、승조비교고적우점,가위진일보우화남겁린하타망망판성능제공삼고의거。
For improving the expansion performance of trawl net in low trawling speed and enhancing the Antarctic krill trawl productivity, a high aspect ratio otter board with hollow structure was developed. A flume model experiment was conducted to measure the lift coefficient ( CL ) , drag coefficient ( CD ) and lift to drag ratio ( K) in different angle of attack (α) . The experimental results are as follows:The CL and K value show a trend of increasing at the beginning and then decreasing with the increase of angle of attack, CD value reflects an upward trend with the increase of angle of attack;whenα=30°, the max lift coefficient (CLmax) is 1. 436, in this case CD=0. 649, K=2. 213;When α=10°, the max lift to drag ratio (Kmax) is 4. 671, in this case CL=0. 981, CD=0. 210. Suggest the best working scope of angle of attack is between 10°~30°, in which case, CL>0. 98 and K >2. 21. Through comparative analysis of the hydrodynamic performance of different types of otter boards, the Antarctic krill trawl otter board has advantages of lower drag coefficient and higher lift to drag ratio, which can provide a reference basis for further optimization of the Antarctic krill trawl otter board.