scholarly journals On the Optimal Location and Number of Intercoolers in a Real Compression Process

1988 ◽  
Author(s):  
Peter Vadasz ◽  
Jossef Pugatsch ◽  
Dan Weiner
Keyword(s):  
Optimal Number ◽  
Optimal Location ◽  
Final Decision ◽  
Specific Work ◽  
Compression Process ◽  
Pressure Losses ◽  
Ideal Process ◽  
Partial Criterion ◽  
Economic Criteria ◽  
The Ideal

In this paper the optimal location and number of intercoolers in a real compression process, including pressure losses, is derived by minimizing the compression specific work. Consequently the series of intermediate pressure values where the system intercoolers should be located is evaluated. As a result a solution different from the classical-isothermal compression process is obtained. The ideal process is evaluated and verified as a particular case by assuming no pressure losses. In reality, minimizing the compression work is only a partial criterion of optimization and the final decision regarding the optimal number of intercoolers should be obtained by using techno-economic criteria.

The Optimal Intercooling of Compressors by a Finite Number of Intercoolers

1992 ◽  
Vol 114 (3) ◽  
pp. 255-260 ◽  
Author(s):  
P. Vadasz ◽  
D. Weiner
Keyword(s):  
Finite Number ◽  
Pressure Ratio ◽  
Optimal Number ◽  
Specific Work ◽  
Relative Pressure ◽  
Correction Factors ◽  
Isothermal Compression ◽  
Compression Process ◽  
Pressure Losses ◽  
The Ideal

Intercooling of compressors is necessary for an efficient process. Among the optimal criteria required, minimizing the compression-specific work is one of the more commonly used. Upon ideal conditions, such a criterion leads to an isothermal compression whose importance is purely theoretical, since it requires an infinite number of intercoolers. In this paper the evaluation of correction factors to the well-known relations of the optimal location of intercoolers in a compression process and its corresponding work of compression was performed for a general compression process which accounts for pressure losses and other irreversibilities as well. As a result of including the pressure losses in the equations, a finite number of intercoolers is evaluated as optimum. The results, although qualitatively expected, show a quantitative nonempirical figure of the optimal number of intercoolers as a function of the terminal pressure ratio and as a function of the relative pressure losses. The ideal conditions are evaluated and verified as a particular case by assuming no pressure losses. In practice, these results can be used as an upper limit for technoeconomical optimization processes.

Designing the Ideal Process Analyser—Or at Least Making the Attempt (Continued)

NIR news ◽  
1994 ◽  
Vol 5 (3) ◽  
pp. 7-9 ◽  
Author(s):  
John Coates ◽  
Perkin-Elmer
Keyword(s):  
Ideal Process ◽  
The Ideal

scholarly journals Survey on finger-vein segmentation and authentication

2017 ◽  
Vol 7 (1.2) ◽  
pp. 9 ◽  
Author(s):  
Shwetambari Kharabe ◽  
C. Nalini
Keyword(s):  
Feature Extraction ◽  
Cost Efficiency ◽  
Personal Identification ◽  
Electronic Information ◽  
Basic Principles ◽  
Long Period ◽  
Finger Vein ◽  
Authentication Technique ◽  
Ideal Process ◽  
The Ideal

Exploding growth in the field of electronic information technology, the finger vein authentication technique plays a vibrant role for personal identification and verification. In recent era, this technique is gaining popularity, as it provides a high security and convenience approach for personal authentication. Vein biometrics is an emerging methodologycomparing to other systems, due to its strengths of low forgery risk, aliveness detection and stableness over long period of time. Literatures published based on different techniques used forand authentication process are described and evaluated in this paper. These processes hadgained an outstanding promise in variety of applications and much attention among researchers to provide combine accuracy, universality and cost efficiency. This paper in brief, reviews various approaches used for finger vein segmentation and feature extraction. The reviews are based on finger vein basic principles, image acquisition methodology, pre-processing functions, segmentation, feature extraction,classification, matching and identification procedures, which are analyzed scientifically, thoroughly and comprehensively.Based on the analysis, the ideal process and procedure is identified, which will be an idyllic solution for finger vein authentication.

Effect of Prediffuser Angle on the Static Pressure Recovery in Flow Through Casing-Liner Annulus of a Gas Turbine Combustor at Various Swirl Levels

2015 ◽  
Vol 8 (1) ◽  
Author(s):  
Prakash Ghose ◽  
Amitava Datta ◽  
Achintya Mukhopadhyay
Keyword(s):  
Gas Turbine ◽  
Static Pressure ◽  
Numerical Study ◽  
Pressure Recovery ◽  
Gas Turbine Combustor ◽  
Pressure Losses ◽  
Pressure Distributions ◽  
Inlet Swirl ◽  
Flow Through ◽  
The Ideal

A numerical study has been performed in an axisymmetric diffuser followed by a casing-liner annulus of a typical gas turbine combustor to analyze the flow structure and pressure recovery in the geometry. Static pressure recovery in a gas turbine combustor is important to ensure high pressure of air around the liner. However, the irreversible pressure losses reduce the static pressure recovery from the ideal value. The presence of swirl in the flow from compressor and prediffuser geometry before the dump diffuser influences the flow pattern significantly. In this study, flow structures are numerically predicted with different prediffuser angles and inlet swirl levels for different dump gaps. Streamline distributions and pressure plots on the casing and liner walls are analyzed. Static pressure recovery coefficients are obtained from the pressure distributions across the combustor. The effect of dump gap on the static pressure recovery has also been evaluated. It is observed that the best static pressure recovery can be obtained at optimum values of inlet swirl level and prediffuser angle. Dump gap is found to have significant influence on the static pressure recovery only at small prediffuser angle.

scholarly journals Performance Analysis of a Turbine Stage Having Cooled Nozzle Blades With Trailing Edge Ejection

1996 ◽  
Author(s):  
J. H. Kim ◽  
T. S. Kim ◽  
J. S. Lee ◽  
S. T. Ro
Keyword(s):  
Performance Analysis ◽  
Turbine Engines ◽  
Coolant Temperature ◽  
Specific Work ◽  
Turbine Stage ◽  
Trailing Edge ◽  
Pressure Losses ◽  
Design Variables ◽  
Loss Prediction ◽  
Parametric Analyses

This work presents an aerothermodynamic modeling of a cooled turbine blade and the performance analysis of a turbine stage having cooled nozzle blades with trailing edge coolant ejection. A mean line analysis, based on the well-known Ainley-Mathieson scheme, is adopted for the basic loss prediction of the blade rows without cooling. A unique model regarding the interaction between coolant and main gas is proposed. The interactions considered are the heat transfer from main gas to coolant and the temperature and pressure losses by the mixing of two streams due to the trailing edge coolant ejection. For a model turbine stage with nozzle cooling, parametric analyses are carried out to investigate the effect of main design variables (amount of coolant flow, coolant temperature and coolant ejection area) on the stage performance. The influences of coolant mass flow ratio and temperature on the mixing loss and specific work are investigated. The results are also rearranged to investigate the effect of blade temperature on the specific work. Analysis is also carried out by varying the ejection area, which may give useful criteria in determining the coolant condition and ejection hole size of real gas turbine engines.

The Effect of Surface Roughness on Efficiency of Low Pressure Turbines

2013 ◽  
Vol 136 (6) ◽  
Author(s):  
Raúl Vázquez ◽  
Diego Torre
Keyword(s):  
Surface Roughness ◽  
High Speed ◽  
Slope Angle ◽  
Low Pressure ◽  
Operating Conditions ◽  
Specific Work ◽  
Pressure Losses ◽  
Comparison Of The Results ◽  
Very High ◽  
Effect Of Surface

The effect of surface roughness on the efficiency of low pressure turbines (LPTs) was experimentally investigated in a multistage turbine high-speed rig. The rig consisted of three stages of a state-of-the-art LPT. The stages were characterized by a very high wall-slope angle, reverse cut-off design, very high lift, and very high aspect ratio airfoils. Two sets of airfoils (both stators and rotors) were tested. The first set was made of airfoils with a roughness size of 0.7 μm Ra (25–35 × 10−5 ks/Cm), which was representative of LPT polished airfoils. The surface finish for the second set of airfoils was 1.8 μm Ra for blades and 2.5 μm Ra for stators (approximately 90 × 10−5 in terms of ks/Cm for both stators and blades). The resulting roughness of this set was representative of “as-cast” airfoils of low pressure turbines. The airfoil geometries, velocity triangles, leading and trailing edge locations, and flowpath were maintained between both sets. They were tested with the same instrumentation and at the same operating conditions with the intention of determining the isolated impact of the surface roughness on the overall efficiency. The turbine characteristics: sensitivity to speed, specific work, Reynolds number, and purge flows, were obtained for both sets. The comparison of the results suggests that the efficiency and capacity of both types of airfoils exhibit the same behavior. No significant differences in the results can be distinguished for the range of operating conditions in this study. The results agree with previous studies of distributed roughness in turbines: the use of as-cast rough airfoils in some low pressure turbines at high altitude does not introduce additional pressure losses.

scholarly journals IDENTIFYING OPTIMAL LOCATION AND NECESSARY QUANTITY OF WAREHOUSES IN LOGISTIC SYSTEM USING A RADIATION THERAPY METHOD

Transport ◽  
2019 ◽  
Vol 34 (3) ◽  
pp. 175-186
Author(s):  
Viktor Danchuk ◽  
Olena Bakulich ◽  
Vitaliy Svatko
Keyword(s):  
Radiation Therapy ◽  
Malignant Tumors ◽  
Freight Transportation ◽  
Optimal Number ◽  
Optimal Location ◽  
Ant Algorithm ◽  
Optimal Planning ◽  
The Cost

The paper suggests a method for determining the optimal location of service points (warehouses) based on the method for optimal planning of radiation therapy of malignant tumors. This method enabled us to identify the location of the most optimal number of warehouses taking into account their capacity for the required volume of freight transportation and distance from warehouses to consumers. The results of the study coincide with the results obtained by using the method of ant algorithm. The proposed method of finding the optimal location of warehouses enables to significantly minimize the cost of delivering goods from a producer to a consumer.

How to Discuss a Paper: Developing and Showcasing Your Scholarly Skills

2014 ◽  
Vol 31 (2) ◽  
pp. 211-218 ◽  
Author(s):  
Kirsten A. Cook ◽  
Matthew Hart ◽  
Michael R. Kinney ◽  
Derek K. Oler
Keyword(s):  
Doctoral Students ◽  
Junior Faculty ◽  
New Faculty ◽  
High Quality ◽  
Ideal Process ◽  
The Ideal

ABSTRACT We offer this paper as a primer for accounting doctoral students and new faculty on how to discuss a paper. We believe that this topic can serve to “jump start” the engagement of students and junior faculty in developing and delivering quality discussions. We begin by emphasizing the importance and benefits of being a good discussant to both the profession and the discussant. We then outline the discussion process and provide detailed suggestions on points to consider in each phase of this process: (1) volunteering to discuss, (2) receiving the discussion assignment, (3) preparing the discussion, (4) presenting the discussion, and (5) following up with the authors after the discussion. Next, we examine data that highlight the need for additional discussant volunteers at conferences. Finally, we present possible innovations to foster high-quality discussions. This paper formalizes the ideal process typically learned through years of mentoring and conference experience.

Research on MEMS multi-point exploding metal foil synchronous array

2021 ◽  
pp. 2140018
Author(s):  
Jianhua Chen ◽  
Jiao Li ◽  
Yin Wang ◽  
Wei Ren ◽  
Hui Li
Keyword(s):  
Optimization Design ◽  
Electrical Explosion ◽  
Peak Time ◽  
Metal Foil ◽  
Peak Voltage ◽  
Mems Technology ◽  
Photonic Doppler Velocimetry ◽  
Voltage Peak ◽  
Ideal Process ◽  
The Ideal

Based on MEMS technology, this paper realized the chip preparation of the synchronous initiation array and obtained the ideal process parameters. The MEMS multi-point exploding metal foil synchronous array chip replaces the traditional initiation array composed of electric detonators, and has a greatly reduced volume and could be prepared in batches. By testing the electrical explosion parameters of the array chip, the peak voltage, peak current, peak time and other data of different ignition voltages are obtained. At the same time, we proposed a method to test the synchronization of the array using multi-channel photonic doppler velocimetry, and obtained the synchronization data when the firing voltage was 2500 V and 2800 V, which provided help for the subsequent optimization design.

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