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Optimal Wing Rotation Angle by the Unsteady Blade Element theory for Maximum Translational Force Generation in Insect-mimicking Flapping-wing Micro Air Vehicle

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Journal of Bionic Engineering 2016年第2期13卷 261-270页

作者： Loan Thi Kim Au Hoang Vu Phan Hoon Cheol Park Department of Advanced Technology Fusion Konkuk University Seoul 143-701 South Korea

This paper provides a parametric study to obtain the optimal wing rotation angle for the generation of maximum transla- tional force in an insect-mimicking Flapping-Wing Micro Air Vehicle （FWMAV） during hovering. The blade element theory and momentum theory were combined to obtain the equation from which the translational aerodynamic force could be esti- mated. This equation was converted into a non-dimensional form, so that the effect of normalized parameters on the thrust coefficient could be analyzed. The research showed that the thrust coefficient for a given wing section depends on two factors, the rotation angle of the wing section and the ratio of the chord to the travel distance of the wing section in one flapping cycle. For each ratio that we investigated, we could arrive at an optimal rotation angle corresponding to a maximum thrust coefficient. This study may be able to provide guidance for the FWMAV design.

关键词： FWMAV optimal rotation angle parametric study blade element theory momentum theory

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Wind Power Potential in Interior Alaska from a Micrometeorological Perspective

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Atmospheric and Climate Sciences 2014年第1期4卷 100-121页

作者： Hannah K.Ross John Cooney Megan Hinzman Samuel Smock Gary Sellhorst Ralph Dlugi Nicole Molders Gerhard Kramm Department of Mechanical Engineering Tennessee Tech UniversityCookevilleUSA Department of Atmospheric Sciences College of GeosciencesTexas A&M UniversityCollege StationUSA College of Arts and Sciences University of WashingtonSeattleUSA Fu Foundation School of Engineering and Applied Science Columbia UniversityNew YorkUSA Geophysical Institute University of Alaska FairbanksFairbanksUSA Arbeitgruppe Atmospharische Prozesse(AGAP) MunichGermany Department of Atmospheric Sciences College of Natural Science and MathematicsUniversity of Alaska FairbanksFairbanksUSA

The wind power potential in Interior Alaska is evaluated from a micrometeorological perspective. Based on the local balance equation of momentum and the equation of continuity we derive the local balance equation of kinetic energy for macroscopic and turbulent systems, and in a further step, Bernoulli’s equation and integral equations that customarily serve as the key equations in momentum theory and blade-element analysis, where the Lanchester-Betz-Joukowsky limit, Glauert’s optimum actuator disk, and the results of the blade-element analysis by Okulov and Sorensen are exemplarily illustrated. The wind power potential at three different sites in Interior Alaska (Delta Junction, Eva Creek, and Poker Flat) is assessed by considering the results of wind field predictions for the winter period from October 1, 2008, to April 1, 2009 provided by the Weather Research and Forecasting (WRF) model to avoid time-consuming and expensive tall-tower observations in Interior Alaska which is characterized by a relatively low degree of infrastructure outside of the city of Fairbanks. To predict the average power output we use the Weibull distributions derived from the predicted wind fields for these three different sites and the power curves of five different propeller-type wind turbines with rated powers ranging from 2 MW to 2.5 MW. These power curves are represented by general logistic functions. The predicted power capacity for the Eva Creek site is compared with that of the Eva Creek wind farm established in 2012. The results of our predictions for the winter period 2008/2009 are nearly 20 percent lower than those of the Eva Creek wind farm for the period from January to September 2013.

关键词： Wind Power Power Efficiency Wind Power Potential Wind Power Prediction WRF/Chem Micrometeorology momentum theory Blade Element Analysis Betz Limit Glauert’s Optimum Rotor Balance Equation for momentum Equation of Continuity Balance Equation for Kinetic Energy Reynolds’Average Hesselberg’s Average Bernoulli’s Equation Integral Equations Weibull Distribution General Logistic Function Eva Creek Wind Farm

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