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The cold flow in a sudden-expansion burner with a vane was viewed and surveyed preliminarily .Thirteen patterns of flow field are presented to discribe the effect of different vane trailing angles and different positions. The results show that with increasing of the vane trailing angle, the length of the recirculating flow and the total pressure loss rise. The distortion in the burner exit decreases.The method by using vane to control the flow field in a sudden-expansion burner is available. 对带有导流片的突扩燃烧室的冷态流场做了初步观察和测量。实验研究包括三个导流片的后缘角,纵向及横向位置各二个,共十三个结构的流场观测。研究结果表明:随叶片后缘角增加,回流区的长度明显减小,总压损失增加,而且叶片的位置和结构角对流场特征有一定的影响。因此,加导流片控制突扩燃烧室流场的方法是有希望的。 Blood flow distributions of canine mandibular rami in two different age groups were measured using the radioactive microsphere technique. The blood flow rates (ml/min/100g) of six regions of canine mandibular ramus of the inflant group were 20. 26±3. 45 , 10. 70±2. 69,6. 52±2.59,8. 92±2. 47,14.19±3.33 and 12.05±3.07.The blood flow rates of the cor respondent regions of mandibular ramus in the adult group were 12.02± 2.31 , 8.65± 2.02,4.39±1.47,6. 07± 1.28 , 7.44± 1.70,and 5.49± 1.42.The blood flow rates of six... Blood flow distributions of canine mandibular rami in two different age groups were measured using the radioactive microsphere technique. The blood flow rates (ml/min/100g) of six regions of canine mandibular ramus of the inflant group were 20. 26±3. 45 , 10. 70±2. 69,6. 52±2.59,8. 92±2. 47,14.19±3.33 and 12.05±3.07.The blood flow rates of the cor respondent regions of mandibular ramus in the adult group were 12.02± 2.31 , 8.65± 2.02,4.39±1.47,6. 07± 1.28 , 7.44± 1.70,and 5.49± 1.42.The blood flow rates of six regions of mandibular ramus in the infant group were all significantly higher than that of the corre spondent regions of the adult group. The distribution patterns of blood supply to mandibular ramus are also not identical between the infant and the adult groups- The age-related differ ences of blood flow distribution of canine mandibular ramus reflects the intimate relation be tween the blood supply and growth of mandibular ramus. 利用放射性生物微球技术,测定了幼年组和成年组狗下颌升支的血流分布情况。研究结果表明,幼年组狗下颌升支6个区域的血流量(ml/min·100g)分别为20.26±3.45、10.70±2.69、6.52±2.59、8.92±2.47、14.19±3.33、12.05±3.07,而成年组狗下颌升支各对应区域的血流量(ml/min·100g)为12.02±2.31、8.65±2.02、4.39±1.47、6.07±1.28、7.44±1.70、5.44±1.42。通过比较发现,幼年组狗下颌升支各区域的血流量均显著大于成年组狗下颌升支各对应区域的血流量。两组动物下颌升支的血供分布方式也有一定的差异,以单位重量内骨血流量计,幼年组狗下颌升支各区域血流量大小依次为髁状突区、喙突区、中央区、后缘角突区、前缘区、下缘区,而成年组狗下颌升支各区域血流量大小依次为髁状突区、后缘角突区、喙突区、前缘区、中央区、下缘区。本研究所揭示的狗下颌升支血流分布的年龄差异,反映了下颌升支的生长发育与其血供的密切关系。
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