Shock Tube Investigation of Pressure and Ion Sensors Used in Pulse Detonation Engine Research PDF Download
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Author: Robert J. McMillan
Publisher:
ISBN: 9781423519164
Category : Internal combustion engines
Languages : en
Pages : 104
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Book Description
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.
Author: Robert J. McMillan
Publisher:
ISBN: 9781423519164
Category : Internal combustion engines
Languages : en
Pages : 104
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Book Description
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.
Author: Jeffrey S. Zdenek
Publisher:
ISBN: 9781423516750
Category : Ion rockets
Languages : en
Pages : 113
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Book Description
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.
Author: Enhua Wang
Publisher: BoD – Books on Demand
ISBN: 1839687495
Category : Technology & Engineering
Languages : en
Pages : 150
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Book Description
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.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 7
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Book Description
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.
Author: Frederick William Geiger
Publisher:
ISBN:
Category : Transportation
Languages : en
Pages : 218
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Book Description
Author: J. L. Stollery
Publisher: Chapman & Hall
ISBN:
Category : Science
Languages : en
Pages : 936
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Book Description
Author: Jim J. Jones
Publisher:
ISBN:
Category : Helium
Languages : en
Pages : 716
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Book Description
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.
Author: Richard Boyd Morrison
Publisher:
ISBN:
Category : Combustion
Languages : en
Pages : 144
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Book Description
Author: Charles E. Treanor
Publisher: State University of New York Press
ISBN: 1438405502
Category : Philosophy
Languages : en
Pages : 908
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Book Description
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.
Author: J. B. Hinkey
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
