端墙形状对蒸汽涡轮效率的影响(英文)

运用CFD数值计算和平面叶栅的吹风试验对蒸汽涡轮导向叶片的端墙效应进行了研究,并在一试验蒸汽涡轮上得到了验证。由于本文研究给出了较高的效率,进一步实施了大量的三维数值模拟,该结果显示使用这一叶型对涡轮有一定的改善,尤其在涡轮叶片尖部有端墙时。在试验蒸汽涡轮上测量了尖部、根部均有端墙和仅尖部有端墙的不同效应,结果表明尖部有端墙时效率有所提高,然而当叶片有直端墙时,效率反而会下降。     

Trojans in habitable zones

With the aid of numerical experiments we examined the dynamical stability of fictitious terrestrial planets in 1:1 mean motion resonance with Jovian-like planets of extrasolar planetary systems. In our stability study of the so-called "Trojan" planets in the habitable zone, we used the restricted three-body problem with different mass ratios of the primary bodies. The application of the three-body problem showed that even massive Trojan planets can be stable in the 1:1 mean motion resonance. From the 117 extrasolar planetary systems only 11 systems were found with one giant planet in the habitable zone. Out of this sample set we chose four planetary systems--HD17051, HD27442, HD28185, and HD108874--for further investigation. To study the orbital behavior of the stable zone in the different systems, we used direct numerical computations (Lie Integration Method) that allowed us to determine the escape times and the maximum eccentricity of the fictitious "Trojan planets."     

Model of 2D optical correlator for fingerprint identification

This paper is devoted to the fingerprint identification problems and the experimental models of relevant optical setups. As published last year, some possibility of a fingerprint identification by means of 1D cut correlation has appeared. The first section of this paper deals with an improvement of our previous method based upon a 1D cut correlation. Originally a fingerprint photographic film record was used. Recently a fingerprint was displayed on a 2D hi-res LCD panel, SHARP. The second section of this paper is devoted to a comparative experimental verification of widely used JTC as a reference 2D correlation method. Finally, a set of experimental data for both techniques is presented     

Simulation of human reactions under extreme conditions.

Lung mass determination in cooperative subjects is possible by computation from the "flow-volume" loop, if total lung resistance (Raw) is known. The model is applicable to tracking changes in weightlessness. Modifications for improving the result are discussed.