Optical diagnostics of laser initiated, RF sustained high pressure seeded plasmas

2006 ◽  
Author(s):  
M. Thiyagarajan ◽  
Siqi Luo ◽  
J. Scharer ◽  
M. Denning
Keyword(s):  
High Pressure ◽  
Optical Diagnostics

scholarly journals Hot-fire testing of liquid oxygen/hydrogen single coaxial injector at high-pressure conditions with optical diagnostics

2019 ◽  
Author(s):  
D.I. Suslov ◽  
J.S. Hardi ◽  
B. Knapp ◽  
M. Oschwald
Keyword(s):  
High Pressure ◽  
High Speed ◽  
Optical Diagnostics ◽  
Liquid Oxygen ◽  
Experimental Investigations ◽  
Rocket Engines ◽  
Chamber Length ◽  
Substantial Progress ◽  
Liquid Rocket ◽  
Coaxial Injector

Injector behavior is of utmost importance for the performance and stability of liquid rocket engines (LREs). A major problem is getting a highly efficient homogeneous mixture and effective chemical reaction of fuels at minimum chamber length. Despite substantial progress in numerical simulations, a need for experimental data at representative conditions for development and validation of numerical design tools still exists. Therefore, in the framework of the DLR-project “ProTau,” the authors have performed tests to create an extended data base for numerical tool validation for high-pressure liquid oxygen (LOx) / hydrogen combustion. During the experimental investigations, a windowed DLR subscale thrust chamber model “C” (designated BKC) has been operated over a broad range of conditions at reduced pressures of approximately 0.8 (4 MPa), 1 (5 MPa), and 1.2 (6 MPa) with respect to the thermodynamic critical pressure of oxygen. Liquid oxygen and gaseous hydrogen (GH2) have been injected through a single coaxial injector element at temperatures of ~ 120 and ~ 130 K, respectively. High-speed optical diagnostics have been implemented, including imaging of OH* emission and shadowgraph imaging at frequencies from 8 up to 10 kHz to visualize the flow field.

High Speed Optical Diagnostics in a High Pressure, RP-2/GOx Fueled Combustor

2017 ◽  
Author(s):  
Henry C. Ballance ◽  
Oleksandr Bibik ◽  
Timothy S. Cook ◽  
Stephen Danczyk ◽  
Stephen A. Schumaker ◽  
...  
Keyword(s):  
High Pressure ◽  
High Speed ◽  
Optical Diagnostics

Optical Diagnostics for Sprays at High Pressure

2020 ◽  
pp. 111-156
Author(s):  
Mark Linne ◽  
Zachary Falgout ◽  
Mattias Rahm
Keyword(s):  
High Pressure ◽  
Optical Diagnostics

scholarly journals Optical diagnostics of diesel spray injections and combustion in a high-pressure high-temperature cell

2005 ◽  
Vol 80 (8) ◽  
pp. 1039-1045 ◽  
Author(s):  
B. Bougie ◽  
M. Tulej ◽  
T. Dreier ◽  
N. J. Dam ◽  
J. J. Ter Meulen ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Optical Diagnostics ◽  
Diesel Spray ◽  
High Pressure High Temperature

Optical Diagnostics in a High-Pressure Combustor with Gaseous Oxygen and Kerosene

2019 ◽  
Vol 35 (1) ◽  
pp. 13-25 ◽  
Author(s):  
Henry C. Balance ◽  
Oleksandr Bibik ◽  
Timothy S. Cook ◽  
Stephen Danczyk ◽  
S. Alexander Schumaker ◽  
...  
Keyword(s):  
High Pressure ◽  
Optical Diagnostics ◽  
Gaseous Oxygen

An experimental study of a very high-pressure diesel injector (up to 5000 bar) by means of optical diagnostics

Fuel ◽  
2020 ◽  
Vol 275 ◽  
pp. 117933 ◽  
Author(s):  
W. Vera-Tudela ◽  
R. Haefeli ◽  
C. Barro ◽  
B. Schneider ◽  
K. Boulouchos
Keyword(s):  
Experimental Study ◽  
High Pressure ◽  
Optical Diagnostics ◽  
Very High

High-pressure freezing of cells in suspension for low-voltage scanning electron microscopy (LVSEM)

1991 ◽  
Vol 49 ◽  
pp. 64-65
Author(s):  
Marek Malecki ◽  
James Pawley ◽  
Hans Ris
Keyword(s):  
Electron Microscopy ◽  
High Pressure ◽  
Low Voltage ◽  
Culture Media ◽  
Cell Structure ◽  
Freeze Substitution ◽  
Ice Crystal ◽  
High Pressure Freezing ◽  
Cell Culture Media ◽  
Voltage Scanning

The ultrastructure of cells suspended in physiological fluids or cell culture media can only be studied if the living processes are stopped while the cells remain in suspension. Attachment of living cells to carrier surfaces to facilitate further processing for electron microscopy produces a rapid reorganization of cell structure eradicating most traces of the structures present when the cells were in suspension. The structure of cells in suspension can be immobilized by either chemical fixation or, much faster, by rapid freezing (cryo-immobilization). The fixation speed is particularly important in studies of cell surface reorganization over time. High pressure freezing provides conditions where specimens up to 500μm thick can be frozen in milliseconds without ice crystal damage. This volume is sufficient for cells to remain in suspension until frozen. However, special procedures are needed to assure that the unattached cells are not lost during subsequent processing for LVSEM or HVEM using freeze-substitution or freeze drying. We recently developed such a procedure.

Prolonged Fixation Studies For Spaceflight

1973 ◽  
Vol 31 ◽  
pp. 332-333
Author(s):  
Robert Corbett ◽  
Delbert E. Philpott ◽  
Sam Black
Keyword(s):  
High Pressure ◽  
Living Systems ◽  
Prolonged Storage ◽  
Time Intervals ◽  
Early Signs ◽  
Large Numbers

Observation of subtle or early signs of change in spaceflight induced alterations on living systems require precise methods of sampling. In-flight analysis would be preferable but constraints of time, equipment, personnel and cost dictate the necessity for prolonged storage before retrieval. Because of this, various tissues have been stored in fixatives and combinations of fixatives and observed at various time intervals. High pressure and the effect of buffer alone have also been tried.Of the various tissues embedded, muscle, cartilage and liver, liver has been the most extensively studied because it contains large numbers of organelles common to all tissues (Fig. 1).

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