Aerodynamic Analysis Using CFD for Gas Turbine Combustion Chamber

2007 ◽  
Author(s):  
Lucilene O. Rodrigues ◽  
Harley S. Alencar ◽  
Marco A. R. Nascimento ◽  
Osvaldo J. Venturini
Keyword(s):  
Numerical Simulation ◽  
Combustion Chamber ◽  
Low Cost ◽  
Turbulence Models ◽  
Combustion Chambers ◽  
Aerodynamic Analysis ◽  
The Past ◽  
Satisfactory Precision ◽  
Low Nox Emission ◽  
Made In

In the past few years, with the development of advanced numerical computational codes, numerical simulation became a promising option to developing and improving the technology in different fields. The obtained results by simulations are used to get important information during the design phase or optimization of industrial equipment. Its employment generates reliable results at low cost due to the reduced number of experiments as well as the opportunity to develop new products and perform many simulations before its production. However, the numerical simulation credibility can only be verified when compared to the obtained results by experiments. This work aims to present and evaluate different aerodynamics models applied to combustion chambers using a CFD tool. In addition, aerodynamic analysis is made in a model of combustion chamber, where the flow is simulated with successive refining of the mesh as part of its validation process. For it, it is used a Low Nox Emission Combustion Chamber from Floxcom project as reference to validate turbulence models. Once that it is done, the selected turbulence model with satisfactory precision is used to describe the aerodynamic behavior of an annular combustion chamber from velocity and pressure distribution, which are important parameters to set load losses and recirculation intensity, which can affect the complex phenomenon of combustion.

Numerical Simulation as Design Optimization Tool for Gas Turbine Combustion Chambers

2010 ◽  
Author(s):  
Digvijay B. Kulshreshtha ◽  
S. A. Channiwala ◽  
Saurabh B. Dikshit
Keyword(s):  
Numerical Simulation ◽  
Temperature Distribution ◽  
Combustion Chamber ◽  
Design Optimization ◽  
Gas Turbine ◽  
Flow Patterns ◽  
Intermediate Zone ◽  
Experimental Investigations ◽  
Combustion Chambers ◽  
Primary Zone

In present study an attempt has been made through CFD approach using CFX 11 to analyze the flow patterns within the combustion liner and through different air admission holes, namely, primary zone, intermediate zone, dilution zone and wall cooling, and from these the temperature distribution in the liner and at walls as well as the temperature quality at the exit of the combustion chamber are predicted. The design optimization is carried out using the CFD results with validation using experimental investigations.

scholarly journals A LOW-COST INSHORE WAVE DIRECTION INDICATOR

1974 ◽  
Vol 1 (14) ◽  
pp. 10
Author(s):  
G. De F. Retief ◽  
A.P.M. Vonk
Keyword(s):  
Flow Direction ◽  
Meteorological Data ◽  
Low Cost ◽  
Ocean Waves ◽  
Wave Direction ◽  
The Past ◽  
Steady State Current ◽  
Near Shore ◽  
Reliable Solution ◽  
Made In

Although many attempts have been made in the past to measure the direction of propagation of ocean waves, a need for a simple, reliable solution to the problem has remained. The technique described here, intended for near-shore usage, makes use of a simple bottom-mounted flow direction indicator. The influence of rip and longshore currents on wave direction recordings is identified and a means of reducing these steady state current effects by a reduction in gauge sensitivity is presented, along with various possible recording and analysis techniques. Usefulness of the gauge is established as a simple engineering tool with certain limitations and examples are given of »'aire direction recordings related to meteorological data. A possible usage of the gauge FE an approximate sediment transport indicator is also proposed.

scholarly journals Selecting a k-ε turbulence model for investigating n-decane combustion in a diesel engine combustion chamber

2019 ◽  
Vol 7 (2) ◽  
pp. 80-87
Author(s):  
Andrii Avramenko
Keyword(s):  
Numerical Simulation ◽  
Diesel Engine ◽  
Combustion Chamber ◽  
Turbulent Flows ◽  
Turbulence Model ◽  
Turbulence Models ◽  
Toxic Substances ◽  
Engine Combustion ◽  
Experimental Findings ◽  
The Impact

The results of a comparative numerical simulation of combustion and formation of toxic substances in a diesel engine combustion chamber are given. Experimental findings were used to identify the mathematical models. The impact of the standard, RNG and realizable k-ε turbulence models on the accuracy of numerical simulation of combustion and the formation of toxic substances was studied. The realizable k-ε turbulence model was shown to provide a closer agreement of computational and experimental data during simulation of the diesel engine process when turbulent flows are described.

scholarly journals Investigation of diesel engine for low exhaust emissions with different combustion chambers

2015 ◽  
Vol 19 (6) ◽  
pp. 2013-2024 ◽  
Author(s):  
Pundlik Ghodke ◽  
Jiwak Suryawanshi
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Compression Ratio ◽  
Test Bench ◽  
Low Cost ◽  
Engine Test ◽  
Engine Test Bench ◽  
Combustion Chambers ◽  
Full Load ◽  
Base Engine

Upcoming stringent Euro-6 emission regulations for passenger vehicle better fuel economy, low cost are the key challenges for engine development. In this paper, 2.2L, multi cylinder diesel engine have been tested for four different piston bowls designed for compression ratio of CR 15.5 to improve in cylinder performance and reduce emissions. These combustion chambers were verified in CFD at two full load points. 14 mode points have been derived using vehicle model run in AVL CRUISE software as per NEDC cycle based on time weightage factor. Base engine with compression ratio CR16.5 for full load performance and 14-mode points on Engine test bench was taken as reference for comparison. The bowl with flat face on bottom corner has shown reduction 25% and 12 % NOx emissions at 1500 and 3750 rpm full load points at same level of Soot emissions. Three piston bowls were tested for full load performance and 14 mode points on engine test bench and combustion chamber ?C? has shown improvement in thermal efficiency by 0.8%. Combinations of cooled EGR and combustion chamber ?C? with geometrical changes in engine have reduced exhaust NOx, soot and CO emissions by 22%, 9 % and 64 % as compared to base engine at 14 mode points on engine test bench.

Wastewater management in Zimbabwe in the context of sustainability

Water Policy ◽  
2004 ◽  
Vol 6 (6) ◽  
pp. 501-517 ◽  
Author(s):  
Innocent Nhapi ◽  
Huub J. Gijzen
Keyword(s):  
Paradigm Shift ◽  
Low Cost ◽  
Institutional Arrangements ◽  
Wastewater Management ◽  
Environmental Implications ◽  
Satisfactory Solution ◽  
The Past ◽  
Funding Mechanism ◽  
Natural Treatment ◽  
Made In

Conventional sanitation approaches are rather inappropriate and expensive ways of providing a satisfactory solution to increasing wastewater problems in developing countries. This paper looks at the financial and environmental implications of the sanitation approaches adopted in Zimbabwe, and from the weaknesses identified, suggests a paradigm shift in which wastewater treatment is geared towards resource recovery and reuse. It was observed that unsustainable methods continue to be used because of deficient institutional arrangements and irrational technology choices made in the past. Natural treatment methods were recommended because they are low cost, easy to operate and maintain, and allow for the re-use of effluent. To achieve this requires a responsive institutional and funding mechanism backed by realistic legislation.

Numerical simulation of the 3D unsteady turbulent flow in a combustion chamber

2011 ◽  
Vol 1 (2) ◽  
Author(s):  
Adrian Stuparu ◽  
Sorin Holotescu
Keyword(s):  
Numerical Simulation ◽  
Combustion Chamber ◽  
Gas Flow ◽  
Bluff Body ◽  
Turbulence Models ◽  
Reynolds Stress Model ◽  
Recirculation Region ◽  
Eddy Simulation ◽  
Large Eddy ◽  
3D Unsteady Flow

AbstractThe influence of turbulence models on the 3D unsteady flow in a combustion chamber with a central bluff body is analyzed. Three different turbulence models are used (realizable k-ε, Reynolds Stress Model and Large Eddy Simulation) and a comparison is made on the evolution of the velocity field over time. The numerical simulation of the gas flow in the combustion chamber was performed using FLUENT 6.3 software and the computational geometry, consisting of a structured mesh with 810,000 cells, was built using the pre-processor GAMBIT 2.4. The extent of the recirculation region behind the bluff body was determined for each turbulence model.

scholarly journals Statistical Review of Microstructure-Property Correlation of Stainless Steel: Implication for Pre- and Post-Weld Treatment

Processes ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 811
Author(s):  
Musa Muhammed ◽  
Mazli Mustapha ◽  
Turnad Lenggo Ginta ◽  
Abdullah Musa Ali ◽  
Faizal Mustapha ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Low Cost ◽  
Dissimilar Welding ◽  
Base Metals ◽  
The Past ◽  
Treatment Processes ◽  
Property Correlation ◽  
Very High ◽  
Welding Technique ◽  
Made In

For the past three centuries, there has been a very high demand for stainless steel for different applications, due to its corrosion resistance coupled with the good strength and low cost of the metal. Several welding techniques have been adopted in the fabrication of stainless steel, with the choice of welding technique hinged on the desired requirements. Advancement has been made in its dissimilar welding with other metals like aluminum, copper and titanium. While similar welding of stainless steel faces the challenge of weld metal property deterioration, dissimilar welding poses more serious challenges due to the differential in chemical composition and the thermophysical properties of the base metals. A review of the literature reveals that considerable progress has been made in the improvement of the properties of the weld joint by the application of several weld treatment processes. It was discovered that most of the researchers focused on the effect of these weld treatment processes on the properties of the weld joints, with little attempt to establish a relationship between the microstructure and properties. This review paper critically analyzed the effect of weld treatment processes on the properties of stainless steel in light of microstructure-property correlation.

Cross-culture outcomes of a brazilian professor Fulbright in the USA

2017 ◽  
Vol 26 (50) ◽  
pp. 115
Author(s):  
Marcelo Da Silva Leite ◽  
Celeste Gaia
Keyword(s):  
Higher Education ◽  
Low Cost ◽  
Cross Culture ◽  
College And University ◽  
Governmental Agencies ◽  
The Past ◽  
University Curriculum ◽  
Fulbright Scholar ◽  
The Usa ◽  
Higher Education Costs

Over the past decade due the expansion of globalization there has been an increasing emphasis on internationalization among faculty, administration and accrediting agencies in the Higher Education.  Although to promote internationalization in the Higher Education, costs are a big challenge, one way to have the international actions with low cost, it is seeking for grants from different governmental agencies and foundations.The Fulbright Scholar program provides a long-standing and externally-funded means for internationalizing college and university curriculum. This article is going to share the perspective   of a Brazilian Fulbright Scholar at an American college and the institution perspective of the Fulbright scholar participation at the College.

South Asian Developmental Crisis (Review Article)

1973 ◽  
Vol 12 (2) ◽  
pp. 181-188
Author(s):  
Rafiq Ahmad
Keyword(s):  
Second World War ◽  
World War ◽  
The Past ◽  
The Great Depression ◽  
Political Independence ◽  
Integrated Theory ◽  
Pass Through ◽  
Developed World ◽  
Second World ◽  
Made In

Like nations and civilizations, sciences also pass through period of crises when established theories are overthrown by the unpredictable behaviour of events. Economics is passing through such a crisis. The challenge thrown by the Great Depression of early 1930s took a decade before Keynes re-established the supremacy of economics. But this supremacy has again been upset by the crisis of poverty in the vast under-developed world which attained political independence after the Second World War. Poverty had always existed but never before had it been of such concern to economists as during the past twenty five years or so. Economic literature dealing with this problem has piled up but so have the agonies of poverty. No plausible and well-integrated theory of economic development or under-development has emerged so far, though brilliant advances have been made in isolated directions.

Sign in / Sign up

Export Citation Format

Share Document