Download or read book A Study on the Atomization and Spray Characteristics of Gelled Simulants Formed by Two Impinging Jets written by Syed Abdul Khader Fakhri and published by . This book was released on 2009 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: The atomization mechanism of Gelled Hypergolic Propellants (GHPs) in an impinging jet flow field is significantly different from that of non-gelled liquid propellants and is not clearly understood. In this study, rheologically matched non-Newtonian fluids which are non-reactive and non-toxic were used to act as a simulants for the gelled hypergolic propellants. A Newtonian fluid has been used as a simulant for liquid propellants and to act as a comparison standard for the non-Newtonian simulants. This study explored the effect of nozzle geometry such as orifice inlet shape and aspect ratio on the jet stream surface dynamics and the break up process before and after doublet jet impingement, respectively. Gels produced, using polymer or particle gellants, displayed less disturbed surfaces than non-gelled fluids, due to increased viscosity. As a result, for a given flow rate the sheet formed by impinging jets was much more stable and the sheet break up length was greater for gelled-water than non-gelled water jets. The nozzle aspect ratio has more noticeable effects on the near-field jet stream characteristics for both fluids than the orifice inlet shape. The longer nozzles form a more stable jet stream which delays the break-up of the sheet, leading to greater break up lengths than the shorter nozzles. For similar Reynolds number, droplet size for gelled water is much smaller than that for non-gelled water. Also, impinging jets employing gelled water produce sprays which are distributed over a wider space and in a wider range of droplet sizes than the jets with non-gelled water.
Download or read book Proceedings of the National Aerospace Propulsion Conference written by Gullapalli Sivaramakrishna and published by Springer Nature. This book was released on 2022-07-23 with total page 633 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the select proceedings of the 3rd National Aerospace Propulsion Conference (NAPC 2020). It discusses the recent trends in the area of aerospace propulsion technologies covering both air-breathing and non-air-breathing propulsion. The topics covered include state-of-the-art design, analysis and developmental testing of gas turbine engine modules and sub-systems like compressor, combustor, turbine and alternator; advances in spray injection and atomization; aspects of combustion pertinent to all types of propulsion systems and nuances of space, missile and alternative propulsion systems. The book will be a valuable reference for beginners, researchers and professionals interested in aerospace propulsion and allied fields.
Download or read book A Study of Sprays Formed by Two Impinging Jets written by Marcus F. Heidmann and published by . This book was released on 1957 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The spray formed by two impinging liquid jets was investigated over a jet velocity range of 5 to 100 feet per second to determine the characteristics of this method of atomization. At low velocities the spray pattern was a smooth sheet completely surrounded by a liquid rim. As jet velocity increased, the rim separated at the downstream end. As jet velocity increased, the rim separated at the downstream end. In this flow region an alternate spray pattern wit ha rippled sheet and periodic drops can occur. At higher jet velocities a fully developed spray was produced which was characterized by waves of drops. The wave pattern was more distinct with high-viscosity fluids. The frequency of the waves in the fully developed spray increased with increased injection velocity and decreasing impingement angle. Jet diameter and length before impingement had a negligible effect on the wave frequency. Characteristics of single jets were the same as determined by other investigators.
Download or read book Mixing Analysis of Like Doublet Injectors in High Pressure Environments for Gelled Propellant Simulants written by Vincent Notaro and published by . This book was released on 2014 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: Impinging doublet injectors offer rocket designers an effective way to atomize and mix opposing jets of fuel and oxidizer. The adaptability of the injector designs and ease of manufacturing make them attractive choices for designers. The adaptability of injector designs introduces many variables to the system like orifice diameter, nozzle orifice pairings, and working fluid to name a few. This expanse of variables requires characterization of phenomenon produced and measurement of performance. The characterization of phenomenon can be used to help explain performance. The atomization and spray characteristics of impinging jets are well understood. The studies in this field cover a multitude of design variables. While mixing quantification is well understood for liquid working fluids and similar orifice pairings, data are still lacking on non-Newtonian working fluids, specifically gelled simulants, and dissimilar orifice pairings. In addition, like mixing data exists for sprays in elevated ambient pressure conditions. Gelling of propellants provides advantages of easier handling and less vapor issues as compared to liquid propellants. Dissimilar orifice pairs offer the opportunity to achieve desired mixture ratios without largely varying operating conditions. A review of mixing studies for liquid working fluids is conducted. The studies focus on defining mixing efficiencies changes based on the injector design variables. In addition, some mixing mechanisms are established and discussed phenomenologically. A review of atomization studies is also conducted. These studies help shed light on mixing characteristics as well as help progress diagnostics in the mixing study field. These studies also focus injector design variables but cover more variables in greater depth than the mixing studies. A combination of a pressure chamber, two flow systems for the two different working fluids, and two pairings of nozzles is used to characterize mixing over different injection velocities and ambient conditions. In addition, the two working fluids and two different nozzle pairings allow comparisons to be made between the different cases. The injection velocity conditions range from 8 m/s to 20 m/s in ambient pressure conditions from atmospheric to 500 psi. Mixing efficiency is calculated using spray mass distributions acquired by PLIF technique. The data processing procedure is defined and is applicable to similar data acquisition systems. The mixing data acquired show that for similar orifice diameter impingement, the ambient pressure increase above atmospheric enhances mixing for both gelled and non-gelled fluid due to reduced break-up lengths. However, the mixing efficiency stops increasing and remains constant above a certain ambient pressure. Gelled simulant generally results in poorer mixing efficiencies than the non-gelled simulant, suggesting momentum carried and pre-impingement jet conditions are the determining factors in mixing. For dissimilar orifice diameter impingement, mixing is generally constant over all the ambient pressures including atmospheric. This may be due to the far downstream distance collection location. For optimized operating conditions, the dissimilar orifice-diameter impingement case can produce better mixing than the similar orifice diameter impingement case.
Download or read book Effect of Impingement Angle on Drop size Distribution Abd Spray Pattern of Two Impinging Water Jets written by Marcus F. Heidmann and published by . This book was released on 1961 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sprays produced by two 0.089-inch-diameter jets at impingement angles of 10 to 90 degrees and jet velocities of 30 to 74 feet per second were studied. Drop-size distributions for sprays formed in 100-foot-per-second air are presented. Distributions were bimodal in character, and the effects of test conditions on the bimodal properties are presented. Photographs of the overall spray pattern produced in quiescent air are also shown.
Download or read book 41st AIAA Aerospace Sciences Meeting Exhibit written by and published by . This book was released on 2003 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Combustion of Energetic Materials written by Kenneth K. Kuo and published by Begell House Publishers. This book was released on 2002 with total page 1114 pages. Available in PDF, EPUB and Kindle. Book excerpt: This edited book contains state-of-the-art information associated with energetic material combustion. There are twelve topical areas, including: Reaction Kinetics of Energetic Materials (Solid, Liquid, and Gel Propellants); Recycling of Energetic Materials; Combustion Performance of Hybrid and Solid Rocket Motors; Ignition and Combustion of Energetic Materials; Energetic Material Defects and Rocket Engine Flowfields; Metal Combustion; Pyrolysis and Combustion Processes of New Ingredients and Applications; Theoretical Modeling and Numerical Simulation of Combustion Processes of Energetic Materials; Combustion Diagnostic Techniques; Propellant and Rocket Motor Stability; Commercial Applications of Energetic Materials (Airbags, Gas Generators, etc.); and Thermal Insulation and Ablation Processes.
Download or read book Characteristics of Gelled Jet A1 Sprays Formed by Internal Impingement of Micro Air Jets written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 33rd AIAA ASME SAE ASEE Joint Propulsion Conference Exhibit written by and published by . This book was released on 1997 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Characterization of the Spray Formed by Two Impinging Jets in Liquid Rocket Injector written by F. Brault and published by . This book was released on 1985 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of the Characteristics of Two Impinging Liquid Jets and the Effects of Jet Velocity and Chamber Pressure written by Verdy J. Pieroni and published by . This book was released on 1955 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Investigation of the Spray Produced by Two Impinging Jets written by Algirdas Maciulaitis and published by . This book was released on 1955 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Impinging jet Spray Characteristics and Correlations written by Russ Washburn and published by . This book was released on 1993 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Holographic Study of the Dense Region of a Spray Created by Two Impinging Jets written by Boseon Kang and published by . This book was released on 1995 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Atomization Characteristics of Impinging Liquid Jets written by H. M. Ryan and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Near field Spray Characteristics of Alternative and Conventional Jet Fuels Using a Twin fluid Atomizer written by Imtiaz Qavi and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Predictions of impinging jet atomization characteristics written by Shawn O. Marshall and published by . This book was released on 1999 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt:
