a quasi-one-dimensional analysis method for scramjet combustors with rearwall-expansion cavity

2017 ◽  
Author(s):  
Yanxiang Zhang ◽  
Zhenguo Wang ◽  
Ming Bo Sun ◽  
Hongbo Wang
Keyword(s):  
Dimensional Analysis ◽  
Analysis Method ◽  
One Dimensional ◽  
Scramjet Combustors ◽  
Dimensional Analysis Method

Comparison of Beam and Shell Theories for the Vibrations of Thin Turbomachinery Blades

1983 ◽  
Vol 105 (2) ◽  
pp. 383-392 ◽  
Author(s):  
A. W. Leissa ◽  
M. S. Ewing
Keyword(s):  
Shallow Shell ◽  
Shell Theory ◽  
Free Vibrations ◽  
Two Dimensional ◽  
Analysis Method ◽  
One Dimensional ◽  
Low Aspect Ratio ◽  
Turbomachinery Blades ◽  
Dimensional Analysis Method ◽  
Beam Theories

A great deal of published literature exists which analyzes the free vibrations of turbomachinery blades by means of one-dimensional beam theories. Recently, a more accurate, two-dimensional analysis method has been developed based upon shallow shell theory. The present paper summarizes the two types of theories and makes quantitative comparisons of frequencies obtained by them. Numerical results are presented for cambered and/or twisted blades of uniform thickness. Significant differences between the theories are found to occur, especially for low aspect ratio blades. The causes of these differences are discussed.

scholarly journals Dimensional Analysis of Average Diameter of Bubbles for Bottom Blown Oxygen Copper Furnace

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Dongxing Wang ◽  
Yan Liu ◽  
Zimu Zhang ◽  
Pin Shao ◽  
Ting’an Zhang
Keyword(s):  
Dimensional Analysis ◽  
High Speed ◽  
Cold Water ◽  
Average Diameter ◽  
Water Model ◽  
Smelting Process ◽  
Analysis Method ◽  
Dimensional Analysis Method ◽  
Principle Of Similarity ◽  
Matte Smelting

Average diameter of bubbles is important in copper furnace. Based on the principle of similarity, a slice water model of a furnace with bottom-blown oxygen in matte-smelting process was established. A high-speed camera was used to record images continuously and clearer pictures were selected for treatment. Finally, image processing software was used for obtaining the average diameter of the bubbles. The effects of different injection conditions and equipment factors such as the diameter of nozzle, the nozzle installing angle, and gas velocity on the average diameter of bubbles were studied with cold water model experiment, exploring the dispersion and disintegration rules of bubbles. According to experimental data and Buckingham’s theorem, by using dimensional analysis method, an empirical formula on average diameter of bubbles was established (dB=0.41666d0.29374θ-0.46572v-0.16725). It can be seen from the formula that nozzle installing angle and diameter of nozzle make the most impact on the average diameter of bubbles in bottom blown oxygen copper furnace.

Study on Optimum Product Portfolio of Coach Board for Metallurgical Enterprise Based on Four-Dimensional Analysis Method

2010 ◽  
Vol 148-149 ◽  
pp. 702-706
Author(s):  
Liang Han ◽  
Rong Du
Keyword(s):  
Growth Rate ◽  
Dimensional Analysis ◽  
Market Share ◽  
Matrix Method ◽  
Three Dimensional ◽  
Product Portfolio ◽  
Sales Growth ◽  
Analysis Method ◽  
Metallurgical Enterprise ◽  
Dimensional Analysis Method

The paper analyzes the application of traditional Boston matrix method and three dimensional analysis chart method on product portfolio of metallurgical enterprise, and raises a four dimensional analysis method by inheriting their advantages and improve disadvantages. It is more effectively and practically to establish optimum product portfolio of domestic metallurgical enterprise by the four dimensional analysis method and the four elements are market share, sales growth rate, profitability and sales efficiency. When metallurgical enterprises analyze the optimum product portfolio using four dimensional analysis method, they should take sales efficiency fully into account, adjust product portfolio timely and at last realize the optimum product portfolio.

scholarly journals One-Dimensional Analysis Method for Cavitation Instabilities of a Rotating Machinery

2017 ◽  
Vol 140 (2) ◽  
Author(s):  
Satoshi Kawasaki ◽  
Takashi Shimura ◽  
Masaharu Uchiumi ◽  
Yuka Iga
Keyword(s):  
System Analysis ◽  
Gain Factor ◽  
Rotating Machinery ◽  
Test Results ◽  
Analysis Method ◽  
Analysis Model ◽  
Analysis Software ◽  
Simple Analysis ◽  
One Dimensional ◽  
Dimensional Analysis Method

Rotating cavitation is an important problem, which makes it difficult to design reliable rotating machines. In this study, a simple analysis method that tried to evaluate the cavitation instabilities of a rotating machinery by using one-dimensional (1D) system analysis software was attempted. In this method, cavitation compliance and mass flow gain factor are distributed in each flow path of the inducer. Analysis results show that cavitation instabilities, including rotating phenomena, exist. With the evolved analysis model, effects of various parameters on the eigenvalues of the system were investigated. Analysis results agreed with inducer test results qualitatively. Furthermore, by the analysis considered whirl motion of the rotor, effects of it on cavitation instabilities were investigated.

Numerical Analysis of Lab Ventilation on Double Gaseous Polluted Sources

2011 ◽  
Vol 374-377 ◽  
pp. 475-479
Author(s):  
Da Hua Jiang ◽  
An Gui Li ◽  
Fa En Shi ◽  
Zhi Hua Wang
Keyword(s):  
Numerical Analysis ◽  
Dimensional Analysis ◽  
Analysis Method ◽  
Emission Efficiency ◽  
Air Supply ◽  
Pollutants Emission ◽  
Temperature Efficiency ◽  
Dimensional Analysis Method ◽  
Supply Velocity

This article uses CFD to study the efficiency of ventilation and pollution discharge of double polluted sources in the lab, and investigate the effect of air exhaust outlet location and air supply velocity on the performance of side ventilation. Using non-dimensional analysis method to analyze change of temperature,velocity with room height, the change of temperature efficiency and pollutants emission efficiency with the air supply velocity. The results show that the efficiencies of temperature and pollutants emission are the highest when h/H=0.175 and v=0.4m/s.

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