Download or read book Influence of Geometry and Flow Variation on Jet Mixing and NO Formation in a Model Staged Combustor Mixer with Eight Orifices written by and published by . This book was released on 1996 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Influence of Geometry and Flow Variation on Jet Mixing and No Formation in a Model Staged Combustor Mixer with Eight Orifices written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-18 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of non-reacting parametric experiments was conducted to investigate the effect of geometric and flow variations on mixing of cold jets in an axis-symmetric, heated cross flow. The confined, cylindrical geometries tested represent the quick mix region of a Rich-Burn/Quick-Mix/Lean-Burn (RQL) combustor. The experiments show that orifice geometry and jet to mainstream momentum-flux ratio significantly impact the mixing characteristic of jets in a cylindrical cross stream. A computational code was used to extrapolate the results of the non-reacting experiments to reacting conditions in order to examine the nitric oxide (NO) formation potential of the configurations examined. The results show that the rate of NO formation is highest immediately downstream of the injection plane. For a given momentum-flux ratio, the orifice geometry that mixes effectively in both the immediate vicinity of the injection plane, and in the wall regions at downstream locations, has the potential to produce the lowest NO emissions. The results suggest that further study may not necessarily lead to a universal guideline for designing a low NO mixer. Instead, an assessment of each application may be required to determine the optimum combination of momentum-flux ratio and orifice geometry to minimize NO formation. Experiments at reacting conditions are needed to verify the present results. Samuelsen, G. S. and Sowa, W. A. and Hatch, M. S. Glenn Research Center JET MIXING FLOW; NITRIC OXIDE; GAS TURBINE ENGINES; FLOW GEOMETRY; CROSS FLOW; SUPERSONIC COMBUSTION; ORIFICES; FLOW DISTRIBUTION; MOMENTUM; COLD GAS; OZONE DEPLETION; FLOW VISUALIZATION; TEMPERATURE MEASUREMENT; ASPECT RATIO; MASS RATIOS; TRANSPORT AIRCRAFT; FLUID JETS; SLOTS; CIVIL AVIATION; COMBUSTION CHAMBERS; HOLE DISTRIBUTION (MECHANICS)...

Download or read book Influence of Geometry and Flow Variation on Jet Mixing and NO Formation in a Model Staged Combustor Mixer written by Massumeh H. Samii and published by . This book was released on 1991 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Influence of Geometry and Flow Variations on NO Formation in the Quick Mixer of a Staged Combustor written by and published by . This book was released on 1995 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Quick Mixing Studies Under Reacting Conditions written by and published by . This book was released on 1996 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Experimental Study of Cross Flow Mixing in Cylindrical and Rectangular Ducts written by D. S. Liscinsky and published by . This book was released on 1993 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ASME Technical Papers written by and published by . This book was released on 1996 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book 30th Aerospace Sciences Meeting and Exhibit 92 0760 92 0809 written by and published by . This book was released on 1992 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mixing of Multiple Jets With a Confined Subsonic Crossflow in a Cylindrical Duct written by James D. Holdeman and published by . This book was released on 1996 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presented at the International Gas Turbine and Aeroengine Congress & Exhibition, Birmingham, UK, Jun 10-13, 1996.

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1996 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Crossflow Mixing of Noncircular Jets written by D. S. Liscinsky and published by . This book was released on 1995 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Initial Conditions on a Single Jet in Crossflow written by D. S. Liscinsky and published by . This book was released on 1995 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Jet Mixing and Emission Characteristics of Transverse Jets in Annular and Cylindrical Confined Crossflow written by D. B. Bain and published by . This book was released on 1995 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effect of Jet Mixing on the Combustion Efficiency of a Hot Fuel rich Cross flow written by Mohamed Boutazakhti and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many combustion systems inject air into a hot fuel-rich cross-flow to minimize carbon monoxide and unburned hydrocarbon emissions. Examples include staged air injection in fluidized bed combustors, gas turbine engines, and electric arc furnace exhaust afterburners. Low CO and unburnt hydrocarbon emissions are important design objectives. Efforts in modeling combustion have failed in accurately predicting the levels of these emissions. The main aim of this study is to improve our understanding of the relationship between mixing, chemical kinetics, and combustion efficiency for air jets in a hot reacting cross-flow. Carbon monoxide and hydrogen concentration measurements have been made for six different round jet configurations issuing air into a hot reacting cross-flow. The study of the performance of four different 9 round jets modules having different jet diameters indicated that the overall equivalence ratio has a significant effect on the maximum combustion efficiency. An equivalence ratio of approximately 0.8 leads to the best combustion efficiency for all of the 9 round jet modules. This result is similar to what is observed in premixed combustion. The predominance of the effect of the equivalence ratio suggests that some premixing between the jets and the cross-flow takes place prior to combustion. The rest of the experiments were run such that the optimum mixing (according to cold flow theory) occurs at [Phi] = 0.8. The experiments also showed that, although the equivalence ratio does not control the location of the optimum point, it does affect the level of emissions. In fact, at constant equivalence ratio, low momentum flux ratios yield higher emissions. The number of jets affects the level of emissions. Larger number of jets provided better combustion efficiency. The unmixedness was measured for the 18 round jets module. This measurement showed the momentum flux ratio is a driving factor affecting mixing. The comparison of the combustion efficiency of H2 and CO suggest that the reaction rate affect the level of combustion efficiency without affecting the location of the optimum.

Download or read book A New Unsteady Mixing Model to Predict No x Production During Rapid Mixing in a Dual Stage Combustor written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-02 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: An advanced gas turbine engine to power supersonic transport aircraft is currently under study. In addition to high combustion efficiency requirements, environmental concerns have placed stringent restrictions on the pollutant emissions from these engines. A combustor design with the potential for minimizing pollutants such as NO(x) emissions is undergoing experimental evaluation. A major technical issue in the design of this combustor is how to rapidly mix the hot, fuel-rich primary zone product with the secondary diluent air to obtain a fuel-lean mixture for combustion in the second stage. Numerical predictions using steady-state methods cannot account for the unsteady phenomena in the mixing region. Therefore, to evaluate the effect of unsteady mixing and combustion processes, a novel unsteady mixing model is demonstrated here. This model has been used to study multispecies mixing as well as propane-air and hydrogen-air jet nonpremixed flames, and has been used to predict NO(x) production in the mixing region. Comparison with available experimental data show good agreement, thereby providing validation of the mixing model. With this demonstration, this mixing model is ready to be implemented in conjunction with steady-state prediction methods and provide an improved engineering design analysis tool. Menon, Suresh Unspecified Center...

Download or read book Fundamentals of Rocket Propulsion written by DP Mishra and published by CRC Press. This book was released on 2017-07-20 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book follows a unified approach to present the basic principles of rocket propulsion in concise and lucid form. This textbook comprises of ten chapters ranging from brief introduction and elements of rocket propulsion, aerothermodynamics to solid, liquid and hybrid propellant rocket engines with chapter on electrical propulsion. Worked out examples are also provided at the end of chapter for understanding uncertainty analysis. This book is designed and developed as an introductory text on the fundamental aspects of rocket propulsion for both undergraduate and graduate students. It is also aimed towards practicing engineers in the field of space engineering. This comprehensive guide also provides adequate problems for audience to understand intricate aspects of rocket propulsion enabling them to design and develop rocket engines for peaceful purposes.

Download or read book Influence of Injector Geometry on Fuel air Mixing and Combustion Performance of a Model Combustor written by Leonel Arellano-Ochoa and published by . This book was released on 2000 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: