Pressure wave attenuation in mufflers with finite backing volumefor pulsed flowing gas laser system

1979 ◽  
Author(s):  
K.-O. TONG ◽  
C. KNIGHT ◽  
B. SRIVASTAVA
Keyword(s):  
Pressure Wave ◽  
Wave Attenuation ◽  
Laser System ◽  
Gas Laser

Pressure wave attenuation in an air pipe flow

2000 ◽  
Vol 214 (4) ◽  
pp. 619-632 ◽  
Author(s):  
H Wang ◽  
G H Priestman ◽  
S B M Beck ◽  
R F Boucher
Keyword(s):  
Pipe Flow ◽  
Pressure Wave ◽  
Flow Measurement ◽  
Wave Attenuation ◽  
Pressure Waves ◽  
The Novel ◽  
Flowing Fluid ◽  
Transmission Attenuation ◽  
Measurement Concept ◽  
Good Agreement

Pressure wave transmission attenuation in an air pipe flow is investigated both theoretically and experimentally. This investigation is to ensure the viability of remote flow measurement in an air pipe flow using a new fluidic pressure-pulse-transmitting flowmeter. The novel flowmeter produces self-induced oscillations, whose frequency is proportional to the flowrate. These pressure waves are transmitted via the flowing fluid and can be detected far downstream of the device. Experimental work has been conducted to ascertain how much the pressure waves are attenuated in air flow in a pipeline. This was done by using pipes of 0.05m diameter and both 4.7 and 28.5m long installed downstream of the flowmeter. A method of network simulation known as transmission line modelling (TLM), which has been programmed as the Sheffield University Network Analysis Software (SUNAS) code, is described and utilized to predict the wave decay through the air pipe flow. The theoretical and experimental results were found to give good agreement, demonstrating both the value of the modelling software and the viability of the remote flow measurement concept.

Experimental study on the pressure wave attenuation across gas-solid fluidized bed by single bubble injection

2017 ◽  
Vol 305 ◽  
pp. 620-624 ◽  
Author(s):  
Kamal Nosrati ◽  
Salman Movahedirad ◽  
Mohammad Amin Sobati ◽  
Ali Akbar Sarbanha
Keyword(s):  
Experimental Study ◽  
Fluidized Bed ◽  
Pressure Wave ◽  
Wave Attenuation ◽  
Single Bubble

The LEKKO VIII CO<inf>2</inf>gas laser system

1981 ◽  
Vol 17 (9) ◽  
pp. 1678-1688 ◽  
Author(s):  
C. Yamanaka ◽  
S. Nakai ◽  
M. Matoba ◽  
H. Fujita ◽  
Y. Kawamura ◽  
...  
Keyword(s):  
Laser System ◽  
Gas Laser

scholarly journals Laser-induced optical breakdown applied for laser spark ignition

2010 ◽  
Vol 28 (1) ◽  
pp. 109-119 ◽  
Author(s):  
E. Schwarz ◽  
S. Gross ◽  
B. Fischer ◽  
I. Muri ◽  
J. Tauer ◽  
...  
Keyword(s):  
Pressure Wave ◽  
Internal Combustion Engines ◽  
Acoustic Pressure ◽  
Laser System ◽  
Optical Breakdown ◽  
Acoustic Energy ◽  
Pollutant Emission ◽  
High Peak Power ◽  
Laser Spark ◽  
Acoustic Pressure Wave

AbstractIn the present article, the experimental investigation of optical breakdown induced by ns/mJ pulses at two wavelengths, 1064 nm and 532 nm, in air of atmospheric pressure is reported and discussed. The obtained breakdown thresholds were compared with theory and are in good agreement. The generated plasmas have been characterized by their amount of scattered laser light, energy transmission, and change of the transmitted temporal shape. Laser-induced plasma formation in a gas, in air, also generates an acoustic pressure wave. The acoustic energy is compared to the laser pulse energy and is found to be linearly dependent. Moreover, the frequency distribution of the characteristic acoustic pressure wave was analyzed. The experiments described were accomplished in order to optimize a laser ignition system with regard to efficiency and costs. The laser system employed for these investigations is a compact high peak power, passively Q-switched, longitudinally diode-pumped solid-state laser. Such a “laser spark plug” should replace conventional spark plugs in internal combustion engines because conventional ignition has reached its limits in terms of efficiency and durability. Thereby, a reduction of pollutant emission should also be feasible.

Measurement and simulation of pressure wave attenuation in upward air–water bubbly flow

2000 ◽  
Vol 21 (1) ◽  
pp. 104-111 ◽  
Author(s):  
H Wang ◽  
G.H Priestman ◽  
S.B.M Beck ◽  
R.F Boucher
Keyword(s):  
Pressure Wave ◽  
Wave Attenuation ◽  
Bubbly Flow
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