Two-Dimensional Compressor Cascades With Optimum Velocity Distribution Over the Blade

1975 ◽  
Vol 97 (1) ◽  
pp. 101-109
Author(s):  
J. Citavy´
Keyword(s):  
Velocity Distribution ◽  
Two Dimensional ◽  
Suction Surface ◽  
Inverse Cascade ◽  
Pressure Distributions ◽  
Boundary Layer Method ◽  
Optimum Velocity ◽  
Stagger Angle ◽  
The Given

Results are presented of a research on an optimum cascade problem in two-dimensional subsonic flow at SVUSS (National Research Institute for Machine Design, Bechovice). The optimisation is based on a determination of the optimum velocity distribution (OVD) and on the solution of the inverse cascade problem. The OVD has been ascertained from a variational problem formulated by Sˇpacˇek as follows: to find such a velocity distribution on the suction surface for which the momentum thickness at the trailing edge has a minimum value. The problem was solved by Ru˚zˇicˇka using a simplified boundary layer method. Inverse cascade problem due to Pola´sˇek was employed to calculate the cascade geometry for a given optimum velocity distribution and the given stagger angle and the space chord ratio. Series of compressor cascades having the optimum velocity distributions has been designed by means of a digital computer. Some cascades of the series were tested in the low-speed windtunnel as well as at the high subsonic speeds. Reasonable agreement between the predicted and the experimental pressure distributions, flow deflection and loss coefficient has been achieved.

Design of Cascades for Incompressible Plane Potential Flows With Prescribed Velocity Distribution

1971 ◽  
Vol 93 (3) ◽  
pp. 321-331 ◽  
Author(s):  
W. Schwering
Keyword(s):  
Velocity Distribution ◽  
Surface Velocity ◽  
Two Dimensional ◽  
Blade Profile ◽  
Method Of Calculation ◽  
Potential Flows ◽  
Loss Coefficients ◽  
Optimum Velocity ◽  
Made In

A method of calculation in designing two-dimensional cascades with given velocity distribution is described. An iterative method of the solution for the integral equation to determine the coordinate function for the blade profile is presented. A parametric formulation for the surface velocity distribution is developed. Some design examples for deceleration cascades with given flow angles and prescribed velocity distribution are discussed. Calculations of the boundary layers along the surfaces of the airfoil and cascade loss coefficients are made in order to obtain information on the quality of cascades designed by this method. Proceeding from the results of boundary layer calculations, it should be possible to further improve the parametric formulation for the surface velocity distribution and in this way prescribe better or even “optimum” velocity distributions.

An Efficient Technique for Three-Dimensional Image Visualization Through Two-Dimensional Images for Medical Data

2017 ◽  
Vol 29 (1) ◽  
pp. 100-109
Author(s):  
Ganesan Gunasekaran ◽  
Meenakshisundaram Venkatesan
Keyword(s):  
Three Dimensional ◽  
Main Idea ◽  
Two Dimensional ◽  
3D Image ◽  
Image Visualization ◽  
Good Determination ◽  
The Given ◽  
Geometric Primitives ◽  
2D Images

Abstract The main idea behind this work is to present three-dimensional (3D) image visualization through two-dimensional (2D) images that comprise various images. 3D image visualization is one of the essential methods for excerpting data from given pieces. The main goal of this work is to figure out the outlines of the given 3D geometric primitives in each part, and then integrate these outlines or frames to reconstruct 3D geometric primitives. The proposed technique is very useful and can be applied to many kinds of images. The experimental results showed a very good determination of the reconstructing process of 2D images.

Aerodynamic Throttling of a Two-Dimensional Flow by a Thick Jet

1976 ◽  
Vol 27 (3) ◽  
pp. 229-242 ◽  
Author(s):  
J B Stek ◽  
H Brandt
Keyword(s):  
Cross Section ◽  
Rectangular Cross Section ◽  
Maximum Height ◽  
Pressure Measurements ◽  
Two Dimensional ◽  
Pressure Distributions ◽  
Air Jet ◽  
Two Dimensional Flow ◽  
Made In

SummaryThe velocity and pressure distributions in a flow generated by a thick air jet that throttles a confined airstream have been studied analytically and experimentally. Velocity and pressure measurements were made in a duct with a rectangular cross section of 102 mm height and 19 mm depth, through which air flowed at velocities ranging from 65 to 80 m/s. The airstream was throttled by a thick air jet having velocities ranging from 130 to 150 m/s that entered the mainstream at angles ranging from 60° to 135°. The jet-mainstream contour was found to be elliptical and agreement within six per cent was obtained between the theoretically and experimentally determined maximum height of the contour. Jet spreading was found to be linear. The theory permits determination of the velocity profile in the jet and gives velocities that deviate less than ten per cent from values obtained experimentally.

Corner Separations Around a NACA65 Blade in a Decelerating Flow

2015 ◽  
Author(s):  
Yoichi Kinoue ◽  
Satoshi Ueno ◽  
Norimasa Shiomi ◽  
Toshiaki Setoguchi
Keyword(s):  
Channel Flow ◽  
Low Energy ◽  
Two Dimensional ◽  
Suction Surface ◽  
Cascade Flow ◽  
Piv Measurement ◽  
Experimental Apparatus ◽  
Focus Type ◽  
Stagger Angle ◽  
Decelerating Channel Flow

In order to examine the fundamental characteristics of a corner separation in a decelerating cascade flow, an experimental apparatus was made and the separations around a NACA65 blade in a decelerating channel flow were examined both experimentally and numerically. The two-dimensional calculations show that the NACA65 cascade flow that has 45 deg. of the turning, 1.24 of the solidity and 17 deg. of the stagger angle is similar to the channel flow that has 14 deg. of the stagger angle in terms of the pitchwise blade force. The experimental investigation by the five-hole probe shows that the accumulations of the low energy fluid can be seen around the corner part and the overturning flow due to the secondary flow exists. And, as the periodicity of the blade wake in the pitchwise direction is comparably good, the wake of this channel flow is similar to the wake of the cascade flow for the two pitch portion. PIV measurement showed that the focus-type separation was seen in the momentary streamline along the suction surface of the blade, whereas no apparent separation was seen in the flow along the endwalls. SD diagram consideration showed that the present case on the study was consistent with the relation between the stall indicator S and the diffusion parameter D proposed by Lei et al.

The Role and Place of Budget Procedure in the System

2003 ◽  
pp. 42-49 ◽  
Author(s):  
E. Bushmin
Keyword(s):  
Budget Process ◽  
Public Expenditures ◽  
Principal Role ◽  
Process Trends ◽  
The Given ◽  
Rules Of The Game

The article is devoted to the analysis of improving budget process trends. The author offers the concept of "financial technologism". Its usage should promote an essential improvement of the budget process. The given concept is based on the fact that the regulation of budget procedure is the process of determination of "rules of the game", and the order of interaction of different institutions within the framework of the budget process, and the trends and volumes of expenses are the strategy of institutions. The procedure within the budget process plays a principal role as compared with the trends and volumes of public expenditures.

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