A thermally activated paraffin-based actuator for gas-flow control in a satellite electrical propulsion system

2003 ◽  
Vol 105 (3) ◽  
pp. 237-246 ◽  
Author(s):  
Lena Klintberg ◽  
Mikael Karlsson ◽  
Lars Stenmark ◽  
Greger Thornell
1999 ◽  
Vol 96 (6) ◽  
pp. 715-720
Author(s):  
G. Danloy ◽  
J. Mignon ◽  
L. Bonte
Keyword(s):  

1980 ◽  
Vol 67 (4) ◽  
pp. 1413-1413
Author(s):  
George J. Kay ◽  
Alan Keskimen

1971 ◽  
Vol 93 (3) ◽  
pp. 200-205
Author(s):  
Seth R. Goldstein ◽  
Andrew C. Harvey

Two passive gas flow controllers are presented which provide compensation for variations in ambient temperature and supply pressure. One technique, which provides first-order error compensation, utilizes a choked orifice having its area linearily varied in proportion to a diaphragm deflection. Compensation is achieved by applying upstream pressure to one side of the diaphragm, and by applying a trapped gas pressure proportional to absolute temperature on the other side of the diaphragm. General design relationships are presented, and a prototype unit constructed to control a minute flow rate of high-pressure oxygen is described. A second flow control technique is presented which provides the required nonlinear temperature compensation for flow supplied through a constant-area choked orifice. This is achieved by utilizing a compliant volume of trapped gas to generate a pressure proportional to the square root of absolute temperature. This pressure is used to control the pressure upstream of the choked orifice, thus providing constant flow.


Author(s):  
Kevin Boyd ◽  
Adam Monkowski ◽  
Jialing Chen ◽  
Tao Ding ◽  
Ray Malone ◽  
...  

Aerospace ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 44 ◽  
Author(s):  
Smruti Sahoo ◽  
Xin Zhao ◽  
Konstantinos Kyprianidis

Electrification of the propulsion system has opened the door to a new paradigm of propulsion system configurations and novel aircraft designs, which was never envisioned before. Despite lofty promises, the concept must overcome the design and sizing challenges to make it realizable. A suitable modeling framework is desired in order to explore the design space at the conceptual level. A greater investment in enabling technologies, and infrastructural developments, is expected to facilitate its successful application in the market. In this review paper, several scholarly articles were surveyed to get an insight into the current landscape of research endeavors and the formulated derivations related to electric aircraft developments. The barriers and the needed future technological development paths are discussed. The paper also includes detailed assessments of the implications and other needs pertaining to future technology, regulation, certification, and infrastructure developments, in order to make the next generation electric aircraft operation commercially worthy.


Author(s):  
M. Zheng ◽  
G. T. Reader

Exhaust purification for lean-burn internal combustion engines has been impaired by the relatively low temperature of the exhaust that makes conventional passive aftertreatment schemes less energy-efficient in oxidation/regeneration. To tackle such adversaries, an active-flow control scheme, reversal-flow control, is outlined and analyzed in this paper. Preliminary energy-efficiency analyses are performed with different gas flow rate, flow reversal frequency, and monolith-solid properties. Simulation results indicate that through active thermal management the supplemental energy consumption can be drastically reduced, which is also supported by previous empirical studies.


2012 ◽  
Vol 59 (12) ◽  
pp. 4895-4906 ◽  
Author(s):  
Henrik Gradin ◽  
Stefan Braun ◽  
Göran Stemme ◽  
Wouter van der Wijngaart

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