第二部分对叶顶间隙泄漏流动和叶尖涡进行了研究分析。
The second part studies and analyzes the tip leakage flow and tip vortex.
结果表明：叶顶间隙气流与主流发生卷吸而生成泄漏涡。
The results showed that the main flow rolled up the leakage flow of the tip clearance and generated the tip leakage vortex.
应用数值方法研究了燃气透平动叶顶部凹槽对动叶气动性能及叶顶传热的影响。
Effects of squealer tips on blade aerodynamic performances and tip heat transfer in a gas turbine were investigated.
利用有限元分析软件分析了某型高压涡轮叶顶间隙在不同工况下随时间的变化。
The high pressure turbine tip clearance variation versus time under different operating conditions were analyzed by the finite element method.
对于不同大小的间隙及环壁静止与旋转的不同壁面条件，揭示了叶顶区流动的细节。
The details of the flow in tip region were predicted under different clearance scale and the condition of both stationary and rotating hub.
渐缩型间隙在叶片前半轴弦受到上通道涡的抑制，减少了叶顶间隙泄漏涡的强度和范围；
Suppressed by the up passage vortex at upstream side of blade, the intensity and scale of the tip clearance leakage vortex is decreased.
测量得到了三个不同周向位置下的涡量图和速度矢量图，并观测到了叶顶泄漏涡的涡旋结构。
The velocity vector and vortical contour in three different circumference positions were successfully acquired and the structure of the tip leakage vortex was clearly illustrated.
利用数值方法研究了某低速轴流孤立压气机转子中非定常叶顶间隙流的流动特征和频率特性。
Numerical methods were utilized to investigate the time-dependent flow patterns and the frequency characteristics of unsteady tip clearance flow in an axial-flow low-speed isolated compressor rotor.
近年来，人们发现压气机叶顶间隙流并非始终处于定常状态，在某些流动条件下，它会产生明显的非定常波动，并影响压气机的总性能。
Recently, the unsteady characteristics of tip clearance flow, which appears in some flow conditions, was discovered and its influence to the compressor performance was recognized.
本文对某亚音轴流压气机的中间三排叶片进行定常与非定常数值模拟，分析在不同的动叶叶顶间隙和静叶气封间隙组合下压气机的流动特性。
One and a half stages of a subsonic compressor were simulated with steady and unsteady calculation, comparing the performance with different combination of tip leakage and seal cavity.
阿滕伯勒猪笼草(Nepenthesattenboroughii ' s)是世界上已发现最大的猪笼草之一，叶顶的瓶状陷阱又大又深，个个都有美式橄榄球那么大。
Each of the cuplike traps on an attenborough's pitcher plant (Nepenthes attenboroughii's) is as big as an American football-making the pitchers among the largest known.
显然一个，并且只有一个，小小的叶甲才能在这个大头针顶——这张40倍图片上银色的圆周——上跳舞。
Evidently one, and only one, tiny leaf beetle can dance on this pin's head — the silvery circle in this 40 X photo.
朱兰属的任何一种坚实的沼泽兰；陆生，根茎纤细，叶一片或少数几片，花单朵顶生。
Any hardy bog orchid of the genus pogo nia: terrestrial orchids having slender rootstocks and erect stems bearing one or a few leaves and a solitary terminal flower.
织工用棕榈叶织成了一顶帽子。
科林斯式柱型风格，较晚出现，采用带叶形饰的钟状柱顶。
The Corinthian order, a later development, introduced lonic capitals detailed with acanthus leaves.
肝顶型1例，表现为自肝顶部方叶发出血管向左上走行汇入左侧内乳静脉。
Apex type was in 1 case, the vein arose from the apex of the liver and drains into the internal thoracic vein.
乡村小屋用棕榈叶作顶。
研究显示AD早期大脑顶颞叶局部脑血流和葡萄糖代谢减低。
Studies showed reduction of cerebral blood flow and glucose metabolism occurring at the parietotemporal lobes of AD patients at the early stage.
纤弱的茎，修长的叶，最高处顶出一蓬芦花，金黄、雪白、淡金。
Slim stem, long leaf, a flower come out on the top, golden, snow white, light yellow.
利用付立叶逆变换，给出了半正弦脉冲激励下桩顶速度时域响应半解析解。分析了主要参数对响应的影响。
Then, a semi-analytical solution for the velocity response of the pile subjected to a semi-sine wave exciting force was derived by using invert Fourier transform.
初步研究成果如下：1。不对顶蓬叶外施乙烯利时，叶片物候期对伤害结果没有显著影响；
The preliminary results are as follows:1. When top cluster leaves are treated by exogenous ethrel, leaves in different phenological-phase have no obvious effect on injuring;
叶1片顶生于卵球形假鳞茎上，狭长圆形，长10-14厘米，宽1.8-2.3厘米，先端微凹，基部收窄成长约1.5厘米的柄。
Pseudobulbs ovate, 1-leaved at apex. Leaves narrowly oblong, 10-14 cm long and 1.8-2.3 cm wide, apex emarginate, base attenuate;
结果 采用顶空进样技术，可鉴定出侧柏叶中29个挥发性化学成分；采用水蒸气蒸馏法可鉴定出34个挥发性化学成分；
RESULTS By GC-MS, 29 volatile compounds in Platycladi Cacumen treated with head-space injection were identified, while 34 volatile compounds identified with steam distillation;
结果 采用顶空进样技术，可鉴定出侧柏叶中29个挥发性化学成分；采用水蒸气蒸馏法可鉴定出34个挥发性化学成分；
RESULTS By GC-MS, 29 volatile compounds in Platycladi Cacumen treated with head-space injection were identified, while 34 volatile compounds identified with steam distillation;
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