Force Measurements of Fixed-Geometry Scramjet Engines from Mach 4 to 8 Flight Conditions

2002 ◽  
Author(s):  
Tohru Mitani ◽  
Tetsuo Hiraiwa ◽  
Muneo Izumikawa ◽  
Syuichi Watanabe ◽  
Yuichi Tarukawa
Keyword(s):  
Force Measurements ◽  
Scramjet Engines

scholarly journals Three-Component Force Measurements for Scramjet Engines 2) Effects of External Flow and Boundary Layer Ingestion

2003 ◽  
Vol 51 (592) ◽  
pp. 252-259 ◽  
Author(s):  
Tohru Mitani ◽  
Yuichi Tarukawa ◽  
Muneo Izumikawa ◽  
Syuichi Watanabe ◽  
Takashi Shimura
Keyword(s):  
Boundary Layer ◽  
External Flow ◽  
Force Measurements ◽  
Scramjet Engines ◽  
Component Force

Casimir forces and vacuum energy

2017 ◽  
Author(s):  
Serge Reynaud ◽  
Astrid Lambrecht
Keyword(s):  
Casimir Force ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Thermal Fluctuations ◽  
Model Systems ◽  
Vacuum Field ◽  
Force Measurements ◽  
Casimir Forces ◽  
Current State ◽  
Field Fluctuations

The Casimir force is an effect of quantum vacuum field fluctuations, with applications in many domains of physics. The ideal expression obtained by Casimir, valid for perfect plane mirrors at zero temperature, has to be modified to take into account the effects of the optical properties of mirrors, thermal fluctuations, and geometry. After a general introduction to the Casimir force and a description of the current state of the art for Casimir force measurements and their comparison with theory, this chapter presents pedagogical treatments of the main features of the theory of Casimir forces for one-dimensional model systems and for mirrors in three-dimensional space.

Criteria for flame holding in H2-fueled scramjet engines

2000 ◽  
Vol 28 (1) ◽  
pp. 689-695 ◽  
Author(s):  
Tohru Mitani ◽  
Muneo Izumikawa
Keyword(s):  
Scramjet Engines

Maximizing the efficiency of a flexible propulsor using experimental optimization

2015 ◽  
Vol 767 ◽  
pp. 430-448 ◽  
Author(s):  
Daniel B. Quinn ◽  
George V. Lauder ◽  
Alexander J. Smits
Keyword(s):  
Leading Edge ◽  
The Body ◽  
Phase Lag ◽  
Force Measurements ◽  
Experimental Optimization ◽  
Image Velocimetry ◽  
Flexible Panel ◽  
Gradient Based ◽  
Power Scale ◽  
Effective Angle

AbstractExperimental gradient-based optimization is used to maximize the propulsive efficiency of a heaving and pitching flexible panel. Optimum and near-optimum conditions are studied via direct force measurements and particle image velocimetry (PIV). The net thrust and power scale predictably with the frequency and amplitude of the leading edge, but the efficiency shows a complex multimodal response. Optimum pitch and heave motions are found to produce nearly twice the efficiencies of optimum heave-only motions. Efficiency is globally optimized when (i) the Strouhal number is within an optimal range that varies weakly with amplitude and boundary conditions; (ii) the panel is actuated at a resonant frequency of the fluid–panel system; (iii) heave amplitude is tuned such that trailing-edge amplitude is maximized while the flow along the body remains attached; and (iv) the maximum pitch angle and phase lag are chosen so that the effective angle of attack is minimized. The multi-dimensionality and multi-modality of the efficiency response demonstrate that experimental optimization is well-suited for the design of flexible underwater propulsors.

Effects of Degassing and Ionic Strength on AFM Force Measurements in Octadecyltrimethylammonium Chloride Solutions

Langmuir ◽  
2005 ◽  
Vol 21 (13) ◽  
pp. 5831-5841 ◽  
Author(s):  
Jinhong Zhang ◽  
Roe-Hoan Yoon ◽  
Min Mao ◽  
William A. Ducker
Keyword(s):  
Ionic Strength ◽  
Force Measurements ◽  
Chloride Solutions
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