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Average Droplet Diameter Measurement and Results for Fuel Aerosol Injected by Certain Types of the Turbojet Burners

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Journal of Thermal Science 1997年第4期6卷 298-306页

作者： Tadeusz Opara (Institute of Aviation technology, Military university of technology, Warsaw, Poland ) Institute of Aviation technology Military University of Technology Warsaw Poland

Measurement of the diameter of the fuel aerosol droplet is very important in the design of new type burners and in diagnostic process. Diffraction method is one of the most useful measuring procedures in this case. An investigation setup is presented enabling the determination of the substituting drop diameter in fuel aerosol stream created by aeroengine injectors. The results obtained for K 108-767, K 108-012, 37.03.9595, 16.83.0310 types are presented.

关键词： particle sizing average diameter of fuel aerosol turbojet burners

Correlation between Electronic Structures and Formability of Icosahedrai Quasicrystals in Aluminium-transition metal Binary Alloys

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Rare Metals 1989年第2期9卷 24-30页

作者： Cheng Tianyi Zhang Shouhua Department of Materials,Beijing university of Iron and Steel technology Beijing Univ of Iron and Steel Technology China

The relation between electronic structures and formability of icosahedral quasicrystals in Al-transition metal binary alloys is investigated *** is found that the number of (s+d) electrons in the transition metals and the parameter |Δ1| which is a measure of the relative bonding between Al and the transition metals are closely related to the formability of icosahedral *** rules of thumb are derived from the experimental results for twelve Al-transition metal alloys.

关键词： Correlation systematically bonding crystalline twelve filled absolutely symmetry metallurgy radius

A RAISED PANEL METHOD BASED ON NURBS FOR FREE-SURFACE POTENTIAL FLOWS WITH FORWARD SPEED

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Journal of Hydrodynamics 2003年第2期15卷 112-120页

作者： Gao Gao, Ma LingSchool of Transportion, Wuhan university of technology, Wuhan 430063, China Sch. of Transp. Wuhan Univ. of Technol. Wuhan 430063 China

A raised panel method based on NURBS (Non-Uniform Rational B-Splines) forfree-surface flows with forward speed is presented. In this generalized panel method, NURBS areemployed to represent the body geometry, disturbed free surface, and to express the unknown sourcestrength distribution, on the body surface and above the free surface. Compared with commonhigher-order panel methods, it has no need of adopting local coordinates. NURBS make the geometryrepresentation of the body shape and the wave pattern more precise. Raised panels above the freesurface produce less numerical dispersion error, need less CPU consumption and are helpful andcombined with collocation-point shifting up-stream, can satisfy the radiation condition *** using continuous and discrete Fourier analysis, numerical errors of this method are discussedand a general expression for the errors of numerical damping and dispersion, including the effectsof the vertical distance of singularities to the free surface, the order of singularity distributionrepresented by B-splines in panels, and collocation-point shifting is derived.

关键词： NURBS free-surface flow raised panel method error analysis B-spline

The characteristics of arc beam shaping in hybrid plasma and laser deposition manufacturing

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Science China(Technological Sciences) 2006年第2期49卷 238-247页

作者： ZHANG Hai’ou1, QIAN Yingping1,3, WANG Guilan1 & ZHENG Qiguang2 1. School of Material Science and technology, Huazhong university of Science and technology, Wuhan 430074, China 2. Institute of Laser technology and Engineering, Huazhong university of Science and technology, Wuhan 430074, China 3. Mechanical Engineering College, Hubei university of technology, Wuhan 430068, China School of Material Science and technology Huazhong University of Science and Technology Wuhan China Mechanical Engineering College Hubei University of Technology Wuhan China Institute of Laser technology and Engineering Huazhong University of Science and Technology Wuhan China

As a new direct metal prototyping technology,the hybrid plasma and laser deposition manufacturing (PLDM) is proposed in this paper. In order to figure out the characteristics of plasma arc beam and mould in the PLDM process of high temperature alloy, the high speed CCD camera is used to obtain the picture around the plasma arc. Afterwards the sketch of picture is clearly obtained. And the effect of laser parameter, such as average power, pulse width, pulse repetition frequency and the angle between laser beam and plasma arc beam on the plasma arc appearance, is studied experimentally. The results show that the modality of plasma arc beam is markedly influenced by laser beam. And the improvements of shape precision and surface state of the layer deposited by PLDM are confirmed.

关键词： plasma hybrid laser, direct deposition, plasma arc beam, molding character, high-temperature alloy.

NON-EQUILIBRIUM SEGREGATION OF Si ON Al-0.35 wt-% Si ALLOY SURFACE

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Acta Metallurgica Sinica(English Letters) 1993年第8期6卷 98-101页

作者： CHEN Niug YU Zongsen university of Science and technology Beijing,Beijing,China professor,Department of Materials Physics,university of Science and technology Beijing,Beijing 100083,China Beijing Univ of Science and Technology Beijing China

Si segregation was observed in the vacancy condensation pits,formed by supersaturated vacancies beneath the oxidation layer of Al-0.35wt-％Si alloy,by optical microscopy,X- ray photoelectron spectroscopy and microhard... 详细信息

关键词： non-equilibrium segregation vacancy AI-Si alloy surface Si

THERMODYNAMIC PROPERTIES OF NITROGEN IN Fe-Cr-Ni ALLOYS AT 1873K

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Acta Metallurgica Sinica(English Letters) 1998年第4期11卷 235-240页

作者： Z.T.Ma and D. Janke (Institute of Iron and Steel technology, Freiberg university of Mining and technology, Germany) Freibers Univ of Mining and Technology Freibers Germany

Thermodynamic behavior of nitropen in Fe-Cr-Ni alloys at 1873K is discussed in the present study. The dependence of upon the content of Cr in Fe-Cr-Ni-N melt is expressed. The present authors’ formalism[17] developed for describing thermodynamics of metallic multicomponent systems is successfully applied to the Fe-Cr-Ni-N quaternary system.

关键词： Fe-Cr-Ni alloy nitropen activity

Investigation on the High Temperature Internal Friction of a Subperitectic Al-Zr Alloy in Precipitating Process of ZrAl_3

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Rare Metals 1989年第3期9卷 20-26页

作者： Teng Gongqing Huang Changzhi Department of Physics,Northeast university of technology,Shenyang,China Northeast Univ of technology China

An inverted torsion pendulum has been used to study the high temperature internal friction of an Al-0.22wt% Zr *** experimental result has shown that the grain boundary internal friction peak shifted to lower temperature,the peak height des- cended and the activation energy related to this peak increased in the precipitating process of ZrAl_3 particle in the ***- while,the high temperature background descended so obviously as to be separated from the grain boundary internal *** internal friction peak caused by diffusion around ZrAl_3 particles has been *** mechanism of improvement of proper. ties of aluminium alloys containing a small amount of zirconium has also been discussed.

关键词： Zr Al

TEM OBSERVATION OF LOCAL DEFORMATION BAND AT CRACK TIP

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Acta Metallurgica Sinica(English Letters) 1992年第3期5卷 147-153页

作者： YAO Kefu university of Science and technology Beijing,Beijing,ChinaTANG Naivong CHEN Nanping Tsinghua university,Beijing,China Beijing Univ of Science and Technology Beijing China

The thin foil specimen of a ferrite-austenite duplex stainless steel was tensiled under transmis- sion electron microscope(TEM).It was found that both in ferrite and austenite the local deformation band at crack tip was formed near to the crack propagating *** forma- tion was related with the crack tip Schmid factor,dislocation shielding,latent hardening and hardening *** the crack tip emitted dislocations to a slip system by the action of pure mode Ⅱ stress resolute,and the decreasing rate of hardening coefficient was suitable,lo- cal deformation band was easy to form.

关键词： crack tip local deformation band dislocation shielding

THE BLOCH CONSTANT OF LOCALLY BIHOLOMORPHIC MAPPINGS ON BOUNDED SYMMETRIC DOMAINS

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Chinese Annals of Mathematics,Series B 1996年第3期17卷 271-278页

作者： GONG SHENG(Department of Mathematics, university of Science and technology of China, Hefei 230026, China) 中国科学技术大学数学系安徽合肥

The estimations of the bounds of the Bloch constant of locally biholomorphic mappingson irreducible bounded symmetric domains are given. When the domain is a unit circle, theestimation of the lower bounds is just the ... 详细信息

关键词： Bounded symmetric domain Bloch mapping Bloch constant,Locally biholomorphic mapping