Author: Aerospace CorporationPublisher:
ISBN:
Category : Shock tubes
Languages : en
Pages : 86
Book Description
Test Time in Low Pressure Shock Tubes
Author: Aerospace CorporationPublisher:
ISBN:
Category : Shock tubes
Languages : en
Pages : 86
Book Description
Shock Tube Test Time Limitation Due to Turbulent Wall Boundary Layer
Author: Aerospace CorporationPublisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 72
Book Description
Shock tube test time limitation due to the premature arrival of the contact surface is analytically investigated for wholly turbulent wall boundary layers. The results are compared with those for wholly laminar wall boundary layers. Working curves are presented for more accurate estimates of test time in specific cases. (Author) -- NTRL website.
Strategies for Obtaining Long Constant-pressure Test Times in Shock Tubes
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 15
Book Description
Several techniques have been developed for obtaining long, constant-pressure test times in reflected shock wave experiments in a shock tube, including the use of driver inserts, driver gas tailoring, helium gas diaphragm interfaces, driver extensions, and staged driver gas filling. Here, we detail these techniques, including discussion on the most recent strategy, staged driver gas filling. Experiments indicate that this staged filling strategy increases available test time by roughly 20 % relative to single-stage filling of tailored driver gas mixtures, while simultaneously reducing the helium required per shock by up to 85 %. This filling scheme involves firstly mixing a tailored helium-nitrogen mixture in the driver section as in conventional driver filling and, secondly, backfilling a low-speed-of-sound gas such as nitrogen or carbon dioxide from a port close to the end cap of the driver section. Using this staged driver gas filling, in addition to the other techniques listed above, post-reflected shock test times of up to 0.102 s (102 ms) at 524 K and 1.6 atm have been obtained. Spectroscopically based temperature measurements in non-reactive mixtures have confirmed that temperature and pressure conditions remain constant throughout the length of these long test duration trials. Finally, these strategies have been used to measure low-temperature n-heptane ignition delay times.
On Flow Duration in Low-pressure Shock Tubes
Author: Anatol RoshkoMeasurements of Flow Duration in a Low-pressure Shock Tube
Author: Virgil A. SandbornAnalysis of Test Times and Boundary Layer Induced Property Variations in a Circular Shock Tube
Author: John J. BertinPublisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 36
Book Description
Measurement of Flow Duration in a Low-pressure Shock Tube
Author: Virgil A. SandbornShock Tube and Gas Dynamic Design Considerations and Implementation for Extended Test Times
Author: Jacklyn HiggsPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
A new shock tube test section has been designed and manufactured for the purpose of increasing the test time and expanding the applications of the shock tube for a multitude of ongoing and future projects. One purpose for the test section extension is to allow for flow visualization of droplets impacted by a shock wave for the interaction of hypersonic vehicles and atmospheric disturbances. Another purpose is to measure behind the incident shock to capture the chemical kinetics for a high-altitude environment and low-pressure, high-temperature space applications. This new test section contains 24 round optical ports for laser spectroscopy for multiple measurement locations in addition to 3 rectangular ports upstream for introducing and imaging droplets in the tube. StanShock was used to simulate the expected test time for the desired temperatures and pressures. This was compared against theoretical calculations of test time as a function of distance and velocity of the shock. The optimal length of the extension of 5 feet was then determined based on minimum required test time and limitations of the physical lab space.
Measurement of Frequency Response of Pressure Gauges by a High-pressure Shock Tube Technique
Author: S. P. PfaffPublisher:
ISBN:
Category : Shock tubes
Languages : en
Pages : 30
Book Description
Shock Tubes
Author: Irving Israel GlassPublisher: University of Toronto Press
ISBN: 1487597584
Category : Education
Languages : en
Pages : 852
Book Description
This volume contains the proceedings of a symposium held at the University of Toronto in June 1969. The symposium consisted of six sessions; each containing an invited paper, followed by six contributed papers reporting on recent, relevant research and development. The topics are: a review of research problems in basic shock tube flows and the possibilities for the shock tube in the future; driving techniques; explosive drivers; theoretical and experimental research in electromagnetic shock tubes; chemical kinetics and spectroscopy; and a review of shock tube diagnostics, instrumentation and fundamental data as well as the measurement of physical quantities.