scholarly journals Reducing the Transition Hysteresis of Inductive Plasmas by a Microwave Ignition Aid

Plasma ◽  
2019 ◽  
Vol 2 (3) ◽  
pp. 341-347
Author(s):  
Tim Gehring ◽  
Qihao Jin ◽  
Fabian Denk ◽  
Santiago Eizaguirre ◽  
David Karcher ◽  
...  
Keyword(s):  
Plasma Discharge ◽  
Microwave Oven ◽  
Mode Transition ◽  
Coil Current ◽  
Ignition System ◽  
Microwave Generation ◽  
Hysteresis Behavior ◽  
System A ◽  
Microwave Ignition ◽  
Measured Pressure

Inductive plasma discharge has been a part of continuous investigations since it was discovered. Especially the E- to H-mode transition and the hysteresis behavior have been topics of research in the last few decades. In this paper, we demonstrate a way to reduce the hysteresis behavior by the usage of a microwave ignition system. With this system, a significant decrease of the needed coil current for the ignition of the inductive driven plasma is realized. For the microwave generation, a magnetron as in a conventional microwave oven is used, which offers a relatively inexpensive way for microwave ignition aid. At the measured pressure of 7.5 Pa, it was possible to reduce the needed coil current for the inductive mode transition by a factor of 3.75 compared to the mode transition current without the ignition aid. This was achieved by initiating the transition by a few seconds of microwave coupling. The performed simulations suggested that the factor can be further increased at higher pressures. That is especially interesting for plasmas that are hard to ignite or for RF-sources that cannot deliver high enough currents or frequencies for the ignition.

Altering the sulfur content in the propanethiol plasma polymers using the capacitive-to-inductive mode transition in inductively coupled plasma discharge

2012 ◽  
Vol 100 (7) ◽  
pp. 071604 ◽  
Author(s):  
Damien Thiry ◽  
Nikolay Britun ◽  
Stephanos Konstantinidis ◽  
Jean-Pierre Dauchot ◽  
Laurent Denis ◽  
...  
Keyword(s):  
Sulfur Content ◽  
Inductively Coupled Plasma ◽  
Plasma Discharge ◽  
Mode Transition ◽  
Plasma Polymers ◽  
Inductively Coupled

scholarly journals Investigation of the hysteresis behavior of a convex column brace based on buckling mode transition mechanism

2019 ◽  
Vol 11 (5) ◽  
pp. 168781401985369 ◽  
Author(s):  
Yuan Zhang ◽  
Shuqing Wang ◽  
Hui Fang ◽  
Zhaode Zhang ◽  
Xinyan Yuan
Keyword(s):  
Mode Transition ◽  
Buckling Mode ◽  
Hysteresis Behavior ◽  
Transition Mechanism

scholarly journals Characterisation of the Draw Resistance Across a Lit Cigarette

2013 ◽  
Vol 25 (6) ◽  
pp. 586-594 ◽  
Author(s):  
S Colard ◽  
S Julien
Keyword(s):  
Pressure Profile ◽  
Experimental Device ◽  
Dead Volume ◽  
Analog To Digital ◽  
Resistance Evolution ◽  
System A ◽  
A Value ◽  
The Impact ◽  
Measured Pressure ◽  
Theory And Experiments

AbstractThe consumer senses and reacts to the draw resistance of the cigarette after it is lit. In spite of this obvious fact, this physical parameter is usually measured under standard conditions on the unlit cigarette (1). In order to evaluate more accurately the smokers’ perception during the course of cigarette smoking, the theoretical aspects of the draw resistance measurement of a lit cigarette have been studied and an experimental device has been developed.During puffing on a smoking machine, the variation of the pressure in the cigarette holder is influenced by several parameters which are independent of the characteristics of the cigarette itself, such as the airflow and the experimental device characteristics. Theory and experiments show that the saturation of the Cambridge filter pad and the dead volume, in the sample holder and connection tubes, significantly modify the measured pressure at the mouth end. The impact of these modifications can be minimized by the calculation of a single parameter which is characteristic of the draw resistance of the cigarette, and derived from the evolution of pressure over time. In addition, the integration of the measured pressure profile during each puff provides another way for the draw resistance assessment and gives a value related to the energy required to generate each of them.An experimental device has been developed using a oneport smoking machine, a cigarette holder with a connection for a pressure sensor, an analog-to-digital converter and a recorder. For the calibration of the system, a procedure using multi-capillary pressure drop standards composed of capillary tubes is discussed.Finally, the developed device and approach enabled the measurement and the recording of the draw resistance evolution over the time as the cigarette burns, and thus a better assessment of the potential smokers’ sensation during smoking.

scholarly journals The influence of impurities on the operation of selected fuel ignition systems in combustion engines

2016 ◽  
Vol 65 (2) ◽  
pp. 349-360 ◽  
Author(s):  
Sebastian Różowicz ◽  
Szymon Tofil
Keyword(s):  
Spark Discharge ◽  
Combustion Engines ◽  
Discharge Energy ◽  
Ignition System ◽  
System A ◽  
Spark Plug ◽  
Different Types ◽  
The Impact ◽  
Influence Of Impurities

Abstract The paper attempts to determine the impact of fuel impurities on the spark discharge energy and the wear of the spark plug electrode. Spark plugs were analyzed in two typical configurations of the ignition system. A number of tests were conducted to determine the wear of the spark plug electrode exposed to different types of impurities. The spark discharge energy for new and worn spark plugs was determined through calculation.

Design and Research of Ignition System for Small Gasoline Engine Electronic Control

2014 ◽  
Vol 602-605 ◽  
pp. 1039-1042
Author(s):  
Jie Hui Li ◽  
Le Sheng Ding ◽  
Guo Wei Shi ◽  
Da Wei Liu ◽  
Guang Yao Zhong
Keyword(s):  
Fuel Consumption ◽  
Control Strategy ◽  
Gasoline Engine ◽  
Electronic Control ◽  
Power Performance ◽  
Ignition System ◽  
Emission Performance ◽  
System A ◽  
Engine System

In order to promote development and propose effective method for small electronically controlled engine system, a electronically controlled ignition system was designed in this paper. Freescale MC9S12XEP100 is chosen as MCU, control strategy was defined with MC33812 to pre-drive ignition. At last, 168F engine is adopted as original machine, optimum ignition advance angle was calibrated, related correction paraments and formulas were defined. Bench experiments results shows that power performance, fuel consumption and emission performance are promoted and improved significantly after the designed ignition system was adopted.

Investigation of multipactor-induced surface plasma discharge and temporal mode transition

2018 ◽  
Vol 113 (1) ◽  
pp. 011603 ◽  
Author(s):  
Guang-Yu Sun ◽  
Bai-Peng Song ◽  
Guan-Jun Zhang
Keyword(s):  
Plasma Discharge ◽  
Mode Transition ◽  
Surface Plasma ◽  
Temporal Mode

Adaptive Mode Selection Using On–Off Switching of Chaos

1998 ◽  
Vol 08 (08) ◽  
pp. 1671-1674 ◽  
Author(s):  
Peter Davis
Keyword(s):  
Mode Selection ◽  
Mode Transition ◽  
Chaotic State ◽  
Stochastic Description ◽  
Idealized Model ◽  
System A ◽  
Chaotic Mode

Onset of chaotic mode transition can be used in a simple and robust mechanism for adaptation in multimode systems. We present an idealized model of adaptive mode selection using on–off switching of chaotic basin transitions in a multistable system. A stochastic description obtained in the limit of large switching intervals gives search times in terms of projections of the chaotic state onto basins of multistability.

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