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不同叶片厚度对轴流风机流动特性影响的数值模拟 被引量:11
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作者 李俊 徐洪海 +1 位作者 余培铨 徐金秋 《风机技术》 2017年第5期20-25,31,共7页
为了获得不同叶片厚度对轴流风机流动特性的影响,对叶片相对厚度为6%、9%、12%以及15%的4种风机进行了数值模拟。结果表明:薄叶片风机在设计流量点附近有更好的气动性能,但流量变化对风机性能的影响明显大于厚叶片风机,厚叶片的风机有... 为了获得不同叶片厚度对轴流风机流动特性的影响,对叶片相对厚度为6%、9%、12%以及15%的4种风机进行了数值模拟。结果表明:薄叶片风机在设计流量点附近有更好的气动性能,但流量变化对风机性能的影响明显大于厚叶片风机,厚叶片的风机有更大的稳定工作区间。叶片厚度的增加,改善了叶片前缘附近的流动情况,但使叶片尾缘附近的做功能力减弱,流动分离更加严重;减小了叶顶泄漏流对主流的影响和叶顶二次流动强度,但叶片中尾部二次流强度增加,使流动失稳,增加了能量损失,使得风机气动性能降低。 展开更多
关键词 轴流风机 数值模拟 叶片厚度 流动特性
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Efficacy Evaluation for the Treatment of Subcapital Femoral Neck Fracture in Young Adults by Capsulotomy Reduction and Closed Reduction 被引量:16
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作者 Cong Liu Meng-Ting Liu +1 位作者 Peng Li hong-hai xu 《Chinese Medical Journal》 SCIE CAS CSCD 2015年第4期483-488,共6页
Background:Subcapital femoral neck fracture in young adults has many complications,and the incidence is increasing year-by-year.The selection of the proper operation method to avoid them is an ambiguous matter.This s... Background:Subcapital femoral neck fracture in young adults has many complications,and the incidence is increasing year-by-year.The selection of the proper operation method to avoid them is an ambiguous matter.This study aimed to evaluate the treatment effect of subcapital femoral neck fracture by the capsulotomy and internal fixation with iliac bone grafting or closed reduction and intemal fixation in young adults.Methods:From March 2003 to February 2010,65 young patients with subcapital femoral neck fractures were treated,including 39 males and 26 females with average age of 34.5 years (range,19-50 years); 29 cases of the left side and 36 cases of the right side.They were randomly divided into Group A with 34 cases treated by closed reduction and internal fixation and Group B with 31 cases treated by the capsulotomy and internal fixation with iliac bone grafting.The two groups had no significant differences in sex,age,body mass index and preoperative Harris Hip Score.The observation criteria involved the length of the incision,blood loss,operation time,nonunion rate,avascular necrosis of the femoral head (ANFH) rate and Harris Hip Score.Results:Four of 65 patients were lost follow-up,and the follow-up rate was 93.8%,the average follow-up time was 38.7 months (range,33-47 months).In Group A,the incision length was 5.1 ± 2.2 cm,blood loss was 84.0 ± 13.2 ml,and operation time was 52.9 ± 10.2 min.In Group B,the incision length was 15.4 ± 4.6 cm,blood loss was 396.0 ± 21.3 ml,and operation time was 1 16.5 ± 15.3 min.Nonunion occurred in 8 patients (25.2%) in Group A and 1 patient (3.3%) in Group B.ANFH occurred in 9 patients (29.1%) in Group A and 2 patients (6.7%) in Group B.Postoperative Harris Hip Score was 89.0 ± 5.6 in Group A and 95.0 ± 4.5 in Group B.The above index of two groups was considered statistically significant (P < 0.05).Conclusions:Capsulotomy and internal fixation with iliac bone grafting can improve fracture healing,reduce ANFH in young adults.It is a safe and effective operation for subcapital femoral neck fracture. 展开更多
关键词 Internal Fixation Open Reduction Subcapital Femoral Neck Fracture Young Adults
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