Download or read book Basic Mechanisms of Combustion Instability and Shock Initiated Supersonic Combustion written by Tau-Yi Toong and published by . This book was released on 1969 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents results of two studies, both aimed at understanding coupling mechanisms in combustion instability. Two such mechanisms are discussed, including experimental verification of essential features involved. In one case, both theory and experiment demonstrate that strong interactions between acoustic and flame oscillations can exist through flow oscillations and that these interactions are due to energy transport between various oscillation modes through linear and nonlinear couplings. In another case, instability is triggered by disturbances occurring in an induction zone as a consequence of sensitivity of induction time to temperature changes. Such instability is observed in exothermic hypersonic blunt-body flows, as manifested by the presence of two distinct unsteady flow fields; one with highly regular periodic oscillations and the other with rather large-scale 'turbulent' structure.
Download or read book Unsteady Supersonic Combustion written by Mingbo Sun and published by Springer Nature. This book was released on 2020-04-14 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the unsteady phenomena needed to understand supersonic combustion. Following an initial chapter that introduces readers to the basic concepts in and classical studies on unsteady supersonic combustion, the book highlights recent studies on unsteady phenomena, which offer insights on e.g. interactions between acoustic waves and flames, flow dominating instability, ignition instability, flame flashback, and near-blowout-limit combustion. In turn, the book discusses in detail the fundamental mechanisms of these phenomena, and puts forward practical suggestions for future scramjet design.
Download or read book Air Force Research Resum s written by and published by . This book was released on with total page 854 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Basic Instability Mechanisms in Chemically Reacting Subsonic and Supersonic Flows written by Tau-Yi Toong and published by . This book was released on 1989 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Fully Implicit Time Accurate Method for Hypersonic Combustion written by Shaye Yungster and published by . This book was released on 1994 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Air Force Research Objectives 1967 written by United States. Air Force. Office of Aerospace Research and published by . This book was released on 1967 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Air Force Research Resum s written by and published by . This book was released on 1968 with total page 868 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Basic Instability Mechanisms in Chemically Reacting Subsonic and Supersonic Flows written by Tau-Yi Toong and published by . This book was released on 1978 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes the main results and conclusions obtained in a research program on basic instability mechanisms in chemically reacting flows. Both theoretical and experimental work was conducted to determine the linear and the non-linear coupling between chemical kinetics and gas dynamics, which lead to wave interactions necessary for sustaining the instabilities. Acoustic, chemical and mixed modes of instability were identified. Non-linear wave-kinetic coupling was found to be important at high activation energies for weak shocks. Threshold values of shock strength and pulse width are required to initiate detonations or explosions. (Author).
Download or read book Air Force Research Objectives written by United States. Air Force. Office of Aerospace Research and published by . This book was released on with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book OAR written by and published by . This book was released on 1967 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Investigation of Detonation Re initiation Mechanisms Following a Mach Reflection of a Quenched Detonation written by Rohit Ranjan Bhattacharjee and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Detonation waves are supersonic combustion waves that have a multi-shock front structure followed by a spatially non-uniform reaction zone. During propagation, a de-coupled shock-flame complex is periodically re-initiated into an overdriven detonation following a transient Mach reflection process. Past researchers have identified mechanisms that can increase combustion rates and cause localized hot spot re-ignition behind the Mach shock. But due to the small length scales and stochastic behaviour of detonation waves, the important mechanisms that can lead to re-initiation into a detonation requires further clarification. If a detonation is allowed to diffract behind an obstacle, it can quench to form a de-coupled shock-flame complex and if allowed to form a Mach reflection, re-initiation of a detonation can occur. The use of this approach permits the study of re-initiation mechanisms reproducibly with relatively large length scales. The objective of this study is to experimentally elucidate the key mechanisms that can increase chemical reaction rates and sequentially lead to re-initiation of a de-coupled shock-flame complex into an overdriven detonation wave following a Mach reflection. All experiments were carried out in a thin rectangular channel using a stoichiometric mixture of oxy-methane. Three different types of obstacles were used - a half-cylinder, a roughness plate along with the half-cylinder and a full-cylinder. Schlieren visualization was achieved by using a Z-configuration setup, a high speed camera and a high intensity light source. Results indicate that forward jetting of the slip line behind the Mach stem can potentially increase combustion rates by entraining hot burned gas into unburned gas. Following ignition and jet entrainment, a detonation wave first appears along the Mach stem. The transverse wave can form a detonation wave due to rapid combustion of unburned gas which may be attributed to shock interaction with the unburned gas. Alternatively, the Kelvin-Helmholtz instability can produce vortices along the slipline that may lead to mixing between burned-unburned gases and potentially increase combustion rates near the transverse wave. However, the mechanism(s) that causes the transverse wave to re-initiate into a detonation wave remains to be satisfactorily resolved.
Download or read book Hypersonic Airbreathing Propulsion written by William H. Heiser and published by AIAA. This book was released on 1994 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt: An almost entirely self-contained engineering textbook primarily for use in undergraduate and graduate courses in airbreathing propulsion. It provides a broad and basic introduction to the elements needed to work in the field as it develops and grows. Homework problems are provided for almost every individual subject. An extensive array of PC-based user-friendly computer programs is provided in order to facilitate repetitious and/or complex calculations. Annotation copyright by Book News, Inc., Portland, OR
Download or read book Experiments Concerning the Occurrence and Mechanism of High frequency Combustion Instability written by Calvin LaRue Barker and published by . This book was released on 1958 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book AFOSR Research the Current Research Program and a Summary of Research Accomplishments written by United States. Air Force. Office of Scientific Research and published by . This book was released on 1967 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is designed to present the research programs of the Air Force Office of Scientific Research for the information of users of Air Force research, for scientific investigators working in the same or in allied fields, and for the military, scientific and academic, and Government communities at large.
Download or read book OAR Cumulative Index of Research Results written by United States. Air Force. Office of Aerospace Research and published by . This book was released on 1965 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ramjet Engines written by Mikhail Makarovich Bondari͡u︡k and published by . This book was released on 1969 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Air Force research objectives 1968 written by United States. Air Force. Office of Aerospace Research and published by . This book was released on 1968 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
