Parametric Study of Active Shock Control Bumps for Transonic Shock Buffet Alleviation

2020 ◽  
Author(s):  
Jack A. Geoghegan ◽  
Nicholas F. Giannelis ◽  
Gareth A. Vio
Keyword(s):  
Parametric Study ◽  
Transonic Shock ◽  
Shock Control

scholarly journals Review of Adaptive Shock Control Systems

2021 ◽  
Vol 11 (2) ◽  
pp. 817
Author(s):  
Sven Christian Künnecke ◽  
Srinivas Vasista ◽  
Johannes Riemenschneider ◽  
Ralf Keimer ◽  
Markus Kintscher
Keyword(s):  
Aircraft Design ◽  
Low Complexity ◽  
Wave Drag ◽  
Point Of View ◽  
Transonic Shock ◽  
Shock Control ◽  
System Integrity ◽  
Near Term ◽  
System Benefit ◽  
Actuation Systems

Drag reduction plays a major role in future aircraft design in order to lower emissions in aviation. In transonic flight, the transonic shock induces wave drag and thus increases the overall aircraft drag and hence emissions. In the past decades, shock control has been investigated intensively from an aerodynamic point of view and has proven its efficacy in terms of reducing wave drag. Furthermore, a number of concepts for shock control bumps (SCBs) that can adapt their position and height have been introduced. The implementation of adaptive SCBs requires a trade-off between aerodynamic benefits, system complexity and overall robustness. The challenge is to find a system with low complexity which still generates sufficient aerodynamic improvement to attain an overall system benefit. The objectives of this paper are to summarize adaptive concepts for shock control, and to evaluate and compare them in terms of their advantages and challenges of their system integrity so as to offer a basis for robust comparisons. The investigated concepts include different actuation systems as conventional spoiler actuators, shape memory alloys (SMAs) or pressurized elements. Near-term applications are seen for spoiler actuator concepts while highest controllability is identified for concepts several with smaller actuators such as SMAs.

Active Transonic Shock Control

2014 ◽  
Author(s):  
Abraham N. Gissen ◽  
Bojan Vukasinovic ◽  
Ari Glezer ◽  
Sivaram Gogineni ◽  
Michael C. Paul ◽  
...  
Keyword(s):  
Transonic Shock ◽  
Shock Control

Parametric Study of Photovoltaic Thermal Solar Collector Using An Improved Parallel Flow

2020 ◽  
Vol 2 (1) ◽  
pp. 19-24
Author(s):  
Sakhr Mohammed Sultan ◽  
Chih Ping Tso ◽  
Ervina Efzan Mohd Noor ◽  
Fadhel Mustafa Ibrahim ◽  
Saqaff Ahmed Alkaff
Keyword(s):  
Thermal Conductivity ◽  
Energy Balance ◽  
Parametric Study ◽  
Solar Collector ◽  
Parallel Flow ◽  
Operating Conditions ◽  
Balance Equations ◽  
Conductivity Type ◽  
Pv Module ◽  
Sunny Weather

Photovoltaic Thermal Solar Collector (PVT) is a hybrid technology used to produce electricity and heat simultaneously. Current enhancements in PVT are to increase the electrical and thermal efficiencies. Many PVT factors such as type of absorber, thermal conductivity, type of PV module and operating conditions are important parameters that can control the PVT performance. In this paper, an analytical model, using energy balance equations, is studied for PVT with an improved parallel flow absorber. The performance is calculated for a typical sunny weather in Malaysia. It was found that the maximum electrical and thermal efficiencies are 12.9 % and 62.6 %, respectively. The maximum outlet water temperature is 59 oC.

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