Experimental Study of High-Frequency Combustion Instability in a Continuously Variable Resonance Combustor (CVRC)

2009 ◽  
Author(s):  
Yen Yu ◽  
Loral O'Hara ◽  
James Sisco ◽  
William Anderson
Keyword(s):  
Experimental Study ◽  
High Frequency ◽  
Combustion Instability

Bone heating and implant removal using a high‐frequency electrosurgical device. An in vivo experimental study

2021 ◽  
Author(s):  
Atsushi Kawamura ◽  
Yosuke Akiba ◽  
Masako Nagasawa ◽  
Makiko Takashima ◽  
Yoshiaki Arai ◽  
...  
Keyword(s):  
Experimental Study ◽  
High Frequency ◽  
Implant Removal

scholarly journals Experimental Study on Dynamic Combustion Characteristics in Swirl-Stabilized Combustors

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1609
Author(s):  
Donghyun Hwang ◽  
Kyubok Ahn
Keyword(s):  
Experimental Study ◽  
Heat Release ◽  
Dynamic Pressure ◽  
Combustion Instability ◽  
Flame Structure ◽  
Pressure Sensors ◽  
Necessary Condition ◽  
Rayleigh Criterion ◽  
Pressure Oscillations ◽  
Geometric Conditions

An experimental study was performed to investigate the combustion instability characteristics of swirl-stabilized combustors. A premixed gas composed of ethylene and air was burned under various flow and geometric conditions. Experiments were conducted by changing the inlet mean velocity, equivalence ratio, swirler vane angle, and combustor length. Two dynamic pressure sensors, a hot-wire anemometer, and a photomultiplier tube were installed to detect the pressure oscillations, velocity perturbations, and heat release fluctuations in the inlet and combustion chambers, respectively. An ICCD camera was used to capture the time-averaged flame structure. The objective was to understand the relationship between combustion instability and the Rayleigh criterion/the flame structure. When combustion instability occurred, the pressure oscillations were in-phase with the heat release oscillations. Even if the Rayleigh criterion between the pressure and heat release oscillations was satisfied, stable combustion with low pressure fluctuations was possible. This was explained by analyzing the dynamic flow and combustion data. The root-mean-square value of the heat release fluctuations was observed to predict the combustion instability region better than that of the inlet velocity fluctuations. The bifurcation of the flame structure was a necessary condition for combustion instability in this combustor. The results shed new insight into combustion instability in swirl-stabilized combustors.

Experimental study of air squeeze effect on high-frequency friction contact

2010 ◽  
Vol 43 (11) ◽  
pp. 2190-2195 ◽  
Author(s):  
Jian-jun Qu ◽  
Ning-ning Zhou ◽  
Yan-li Wang
Keyword(s):  
Experimental Study ◽  
High Frequency ◽  
Friction Contact ◽  
Squeeze Effect

scholarly journals Experimental study of the hydrodynamic behaviour of a high frequency ultrasonic reactor

1998 ◽  
Vol 5 (1) ◽  
pp. 1-6 ◽  
Author(s):  
N. Gondrexon ◽  
V. Renaudin ◽  
C. Petrier ◽  
M. Clement ◽  
P. Boldo ◽  
...  
Keyword(s):  
Experimental Study ◽  
High Frequency ◽  
Hydrodynamic Behaviour

EXPERIMENTAL STUDY OF CFOA-BASED INDUCTORLESS CHUA'S CIRCUIT

2004 ◽  
Vol 14 (04) ◽  
pp. 1369-1374 ◽  
Author(s):  
RECAI KILIÇ
Keyword(s):  
Experimental Study ◽  
High Frequency ◽  
Chaotic Behavior ◽  
Comparative Investigation ◽  
Experimental Setup ◽  
Chua’S Circuit ◽  
Current Feedback ◽  
Chua's Circuit ◽  
Op Amps ◽  
High Frequency Performance

The current feedback op amps (CFOAs), with some significant advantages over the conventional op amps, have been used instead of voltage op amps (VOAs) in new implementations of Chua's circuit. In our previous study, after providing a comparative investigation of CFOA-based realizations of Chua's circuit in the literature, we have also presented an alternative inductorless CFOA-based realization of Chua's circuit, and the circuit's chaotic behavior by Pspice simulations. In this paper, we investigate CFOA-based Chua's circuit by constructing an experimental setup, and testing the performance of the proposed implementation at different frequencies. Its excellent high frequency performance was experimentally verified.

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