Two-dimensional UV-laser diagnostic by high-speed imaging for microgravity combustion research at Bremen drop tower

1997 ◽  
Author(s):  
Hartmut Renken ◽  
T. Bolik ◽  
C. Eigenbrod ◽  
J. Koenig ◽  
H. Rath ◽  
...  
Keyword(s):  
High Speed ◽  
Drop Tower ◽  
Two Dimensional ◽  
Uv Laser ◽  
High Speed Imaging ◽  
Microgravity Combustion ◽  
Laser Diagnostic

Digital high-speed camera system for combustion research using UV-laser diagnostic under microgravity at Bremen drop tower

1997 ◽  
Author(s):  
Hartmut Renken ◽  
T. Bolik ◽  
Ch. Eigenbrod ◽  
Jens Koenig ◽  
Hans J. Rath
Keyword(s):  
High Speed ◽  
Drop Tower ◽  
High Speed Camera ◽  
Uv Laser ◽  
Camera System ◽  
Laser Diagnostic

Characteristics of Two-Phase Flow in Packed Bed Systems

2021 ◽  
Author(s):  
Noriaki Yasugi ◽  
Akito Fujitsu ◽  
Naoya Odaira ◽  
Daisuke Ito ◽  
Kei Ito ◽  
...  
Keyword(s):  
Pressure Drop ◽  
High Speed ◽  
Two Phase Flow ◽  
Packed Bed ◽  
Phase Flow ◽  
Two Dimensional ◽  
High Speed Imaging ◽  
Two Phase ◽  
Dimensional Network ◽  
Interfacial Drag

Abstract Two-phase pressure drop in the debris has been studied by many researchers in relation to the debris cooling characteristics during a severe accident in a nuclear reactor. However, its flow regime transition of the two-phase flow in the debris has not been well understood, which strongly affects the interfacial drag and the pressure drop. Conventional models for gas-liquid two-phase flow pressure drop have not been established well to evaluate interfacial drag accurately. In this study, high-speed imaging of a two-dimensional network model was performed to clarify the effect of flow pattern on interfacial drag and pressure drop. Normally it would be very difficult to visualize such two-phase flow behavior in an ordinary packed bed due to the reflection/refraction of light and/or overlapping bubbles, even if the test section is made of transparent materials. Therefore, in this study, a test section, which simulates two-dimensional network of porous structures, was fabricated to avoid the overlapping bubbles. By using a high-speed imaging of the two-dimensional network model, two-phase flow pattern in the porous structure have been identified. From the experimental results, it was suggested that the interfacial drag term should be modified in the gas-liquid two-phase flow pressure drop model.

Laser Diagnostic Investigation on the Spray and Combustion with Butanol-Biodiesel-Diesel Fuel Blends

2012 ◽  
Vol 443-444 ◽  
pp. 986-995 ◽  
Author(s):  
Yu Liu ◽  
Jun Li ◽  
Ying Gao ◽  
Xin Mei Yuan
Keyword(s):  
High Speed ◽  
Copper Vapor Laser ◽  
High Speed Imaging ◽  
Penetration Length ◽  
Spray Penetration ◽  
Sudden Drop ◽  
Ambient Temperatures ◽  
Fuel Blends ◽  
Constant Volume Chamber ◽  
Laser Diagnostic

. In this paper, blends of butanol-biodiesel-diesel were tested inside a constant volume chamber to investigate liquid spray and combustion of the fuels. With high-speed camera and synchronized copper vapor laser, spray penetration during injection is recorded since it has a higher light reflectivity. Various ambient temperatures and fuel composition were investigated. There is a sudden drop in spray penetration at 800 K and 900 K, but not at 1000 K and 1200 K. When the spray penetration of the butanol-biodiesel-diesel blends is compared to that of the biodiesel-diesel blends, under non-combusting environment, a sudden drop in spray penetration length is also observed at 1100 K. High speed imaging shows that, for the non-combusting case, at 1100 K, the tip of the spray jet erupts into a plume sometime after injection for the butanol-biodiesel-diesel blend. The same is not seen with the biodiesel-diesel blend, neither at lower ambient temperature of 900 K. It is concluded that micro-explosion can occurs under particular conditions for the butanol-biodiesel-diesel blend, and the results is consistent with previous study in the literature.

UV laser diagnostic system for combustion research under microgravity at drop tower Bremen

1995 ◽  
Author(s):  
Hans Stephen Albrecht ◽  
Daniel Mueller ◽  
T. Schroeder ◽  
Wolfgang Triebel ◽  
Ch. Eigenbrod ◽  
...  
Keyword(s):  
Diagnostic System ◽  
Drop Tower ◽  
Uv Laser ◽  
Laser Diagnostic

Experimental Measurement of In-Plane Rolling Nonpneumatic Tire Vibrations Using High-Speed Imaging

2019 ◽  
Vol 47 (3) ◽  
pp. 196-210
Author(s):  
Meghashyam Panyam ◽  
Beshah Ayalew ◽  
Timothy Rhyne ◽  
Steve Cron ◽  
John Adcox
Keyword(s):  
High Speed ◽  
Image Correlation ◽  
Dynamic Mode Decomposition ◽  
Dynamic Mode ◽  
High Speed Imaging ◽  
Correlation Algorithm ◽  
Mode Decomposition ◽  
Series Of Experiments ◽  
Plane Deformations ◽  
Dominant Frequencies

ABSTRACT This article presents a novel experimental technique for measuring in-plane deformations and vibration modes of a rotating nonpneumatic tire subjected to obstacle impacts. The tire was mounted on a modified quarter-car test rig, which was built around one of the drums of a 500-horse power chassis dynamometer at Clemson University's International Center for Automotive Research. A series of experiments were conducted using a high-speed camera to capture the event of the rotating tire coming into contact with a cleat attached to the surface of the drum. The resulting video was processed using a two-dimensional digital image correlation algorithm to obtain in-plane radial and tangential deformation fields of the tire. The dynamic mode decomposition algorithm was implemented on the deformation fields to extract the dominant frequencies that were excited in the tire upon contact with the cleat. It was observed that the deformations and the modal frequencies estimated using this method were within a reasonable range of expected values. In general, the results indicate that the method used in this study can be a useful tool in measuring in-plane deformations of rolling tires without the need for additional sensors and wiring.

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