Download or read book Shock Tube Investigation of Pressure and Ion Sensors Used in Pulse Detonation Engine Research written by Robert J. McMillan and published by . This book was released on 2004-06 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shock tubes utilize a difference in pressures between gases separated by a diaphragm to create a shock wave when the diaphragm ruptures. The AFIT 2- inch shock tube was reassembled and tested to ensure proper and safe operation. A high-speed data acquisition system was configured to take data at 2 MS/s. This research showed that the Mach number of the shock waves produced in this shQCk tube fall within 7% of theoretical values at speeds under Mach 3 and within 9% at higher speeds. The peak velocity of each shock wave was shown to occur at approximately 3 meters from the diaphragm. The second portion of the research focused on the testing of sensors used to evaluate the performance of the pulse detonation engine (PDE) for research and developmental purposes. Two alternatives were developed to standard sensors to withstand the heat of the engine: coat the sensors with an insulating, 0.6 mm thick silicone that protects it from the heat and use spark plugs as ion sensors to detect the ions in the combustion inside the PDE tubes. This researched proved that no degradation in response time, rise time, or sensitivity results from coating the pressure transducers with silicone. The research also found that the ion sensors are unable to consistently detect ions created by a Mach 8 shock wave through air.
Download or read book Ion Based Pressure Sensor for Pulse Detonation Engines written by Jeffrey S. Zdenek and published by . This book was released on 2004-03 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: A high speed, durable, ion probe based pressure sensor is being investigated for use in pulse detonation engines. Traditional pressure sensors are ill suited for the high temperature and vibratory environment encountered in such engines. An alternative transient pressure sensing method is investigated for pressures behind a hydrocarbon flame. These flames generate ions that are quenched by collisions as a function of pressure. An experiment was devised to correlate the ion decay rate with the pressure using an ion probe well suited for the flow. A correlation has been established showing the ion decay rate is a function of pressure. Additional investigation is required even though the ion probe remains a viable alternative method for measuring pressure.
Download or read book Internal Combustion Engine Technology and Applications of Biodiesel Fuel written by Enhua Wang and published by BoD – Books on Demand. This book was released on 2021-08-18 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines internal combustion engine technology and applications of biodiesel fuel. It includes seven chapters in two sections. The first section examines engine downsizing, fuel spray, and economic comparison. The second section deals with applications of biodiesel fuel in compression-ignition and spark-ignition engines. The information contained herein is useful for scientists and students looking to broaden their knowledge of internal combustion engine technologies and applications of biodiesel fuel.
Download or read book Ion Based High Temperature Pressure Sensor written by and published by . This book was released on 2004 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: A high speed, durable, ion probe based pressure sensor is being investigated for use in pulse detonation engines. The environment encountered in such engines necessitates high temperature and durable (vibration resistant) devices. Traditional pressure sensors can be used, however thermal insulating materials must be used to protect the diaphragm. These materials dampen and reduce the pressure wave allowing for qualitative results only. An alternative pressure sensing method is investigated for pressures behind a hydrocarbon flame in the pulse detonation engine. Hydrocarbon flames generate ions that are quenched by collisions with other species and walls. As the collision rate is a function of pressure, so too is the ion quench rate. The ion decay rate is measured using an ion probe well suited for the high temperature flow, inexpensive, and has no moving parts. Similar systems have been used to determine equivalence ratio in automobile engines. Further, wave speed may be determined through the use of multiple sensors. This investigation builds upon these capabilities to examine the quantitative pressures. In the current design, the ion probe acts as a charged capacitor. When an ionized field nears the probe, the electrical circuit is connected. The electrode on the probe discharges through the ionized field to a grounded plate. The rate of discharge indicates the strength of the ionized field which decays according to pressure. The experimental setup for this investigation and preliminary findings are presented here. Correlations between the decay rate and pressure are to be determined and compared to theory.
Download or read book The Shock Tube as an Instrument for the Investigation of Transonic and Supersonic Flow Patterns written by Frederick William Geiger and published by . This book was released on 1949 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Shock Tube Research Proceedings of the Eighth International Shock Tube Symposium Imperial College London 5 8 July 1971 written by J. L. Stollery and published by Chapman & Hall. This book was released on 1971 with total page 936 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Investigation of Attenuation of Strong Shock Waves in a Shock Tube with Hydrogen and Helium as Driver Gases written by Jim J. Jones and published by . This book was released on 1957 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation has been made of the attenuation of strong shock waves in air in a shock tube. Time-history measurements were made of the static pressure at several stations in the wall of the tube. The internal diameter of the tube is 3.75 inches. shock-wave-velocity data were taken for a distance along the tube of about 120 feet.
Download or read book A Shock Tube Investigation of Detonative Combustion written by Richard Boyd Morrison and published by . This book was released on 1952 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Shock Tubes and Waves written by Charles E. Treanor and published by State University of New York Press. This book was released on 1982-06-30 with total page 908 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sponsored by the U.S. Air Force Office of Scientific Research, this conference was held in Niagara Falls on July 6–9, 1981. This book includes material on the following topics: instrumentation and diagnostics, shock tube facilities and techniques, gas dynamic experiments, heat transfer and real gas effects, boundary layers, shock structure, shock propagation, laser and spectral optical studies, chem and kinetics, relaxation and excitation, ionization, dusty gases, two-phase flow and condensation, shock waves in the environment and energy, and energy-related processes. The book contains a total of 98 papers by well-known specialists.
Download or read book Shock Tube Experiments for the Development of a Hydrogen fueled Pulse Detonation Engine written by J. B. Hinkey and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Shock Tubes written by I. I. Glass and published by [Toronto, Ont.] : University of Toronto Press. This book was released on 1970 with total page 860 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Shock Tube in High temperature Chemical Physics written by Alfred Gordon Gaydon and published by . This book was released on 1963 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book a study of cylidrical shock waves in a sector tube written by a. cole and published by . This book was released on 1961 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Calibration and Interpretation of Recorded Shock tube Pressure Data Using Piezoelectric Sensors written by C. W. Hicks and published by . This book was released on 1963 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is intended to serve as a guide, or basis, for the calibration and analysis of recorded pressure data. Many of the techniques and areas covered are also applicable to other types of gages; i.e., strain, velocity, acceleration, etc. Photographs of typical shock-tube data are generously used to familiarize the reader with the actual appearance of the true pressure pulse which has been modulated by the effects of resonance, overshoot, groundloops, inadequate bandwidth, and poor gage isolation.
Download or read book An Investigation of the AFIT 2 Inch Shock Tube as a Flow Source for Supersonic Testing written by and published by . This book was released on 1994 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation of the AFIT high pressure shock tube was conducted to determine how closely it followed ideal shock tube theory and to determine the available test times for an attached Mach 3 nozzle. The driver section was five feet (1.52 m) long and the driven section was 25 feet (7.62 m) long. The driver gas used for this study was helium while the driven gas was atmospheric air. The pressure rise measured behind the incident shock wave was, on average, 30% lower than predicted by the ideal shock tube relations. Behind the reflected shock, the pressure rise was 65% lower than predictions based on initial driver gas pressure. Due to supply pressure limits and lower than predicted pressures behind the shock waves, fully expanded flow in the Mach 3 nozzle was not attained. However, steady overexpanded flows of Mach 2.74-2.96 were observed for periods of 4-12 milliseconds.
Download or read book Investigation of a Shock Tube as a Means of Dynamic Pressure Transducer Evaluation written by William Theodore Steils and published by . This book was released on 1969 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Shock Tube for Downselecting Material Concepts for Blast Protection Part I Description of the Shock Tube and a Comparison of Flush Mounted and Recess Mounted Pressure Sensors written by and published by . This book was released on 2008 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report documents Part I of a study on the interaction between shock waves and material systems as part of a U.S. Army initiative to better protect individual Soldiers against novel blast threats. The research was conducted using a shock tube fabricated at the U.S. Army Natick Soldier Research, Development and Engineering Center (NSRDEC). The shock tube was used because it is less expensive than explosive blasts, allows many tests to be obtained in a short time, offers much better repeatability, and can be operated in a laboratory setting. The primary goal of its use was to identify appropriate test procedures and evaluation criteria for the initial screening and down selection of material systems that have potential to provide blast protection, subsequently enabling evaluation of down selected systems in true blast environments. The work reported here was designed to answer some of the questions involved in measuring pressure behind flexible fabrics, such as the effect of sensor mounting (flush mounted versus recessed) and the effect of sample thickness or areal density on the pressure measurement. Several analyses were performed to correlate theoretical calculations with the observed measurements. The results indicate that the shock tube worked properly and that all sensors responded appropriately. The data from this study suggest that careful consideration must be given to appropriate mounting of materials with respect to pressure sensors for measurement. The degree of contact between sensor and material may have a significant effect on results.
