Aerodynamic characteristics

Part 2 book "Small wind turbines for electricity and irrigation" includes content: Engineering of the support structures for wind turbines; probability distribution of the wind speed and preliminary design of wind power installations; sizing energy storage systems; design of wind pumping systems; unconventional wind driven machines; aerodynamic characteristics of blunt bodies and airfoils.

184p dianmotminh00 22-04-2024 5 3   Download

In this study, we investigated the influence of blade shapes on the aerodynamic noise characteristics of helicopter main rotors by the vortex method. The obtained results are the variation of the time-dependent lift coefficient of rotors and the aerodynamic noise characteristics of the helicopter rotor with different blade shapes.

15p vibego 02-02-2024 6 2   Download

When the airship moves in the air, the tail-wings play a very important role in controlling and maintaining stability. The choice of the tail-wing layout determines the design, manufacture, construction and aerodynamic shape of each type of airship. On the tail-wings extra wings, brake wings are also put to help the flight process of safety.

8p viengels 25-08-2023 4 2   Download

This article presents an approach to build and verify a tool for calculating aerodynamic noise characteristics of helicopter rotors. The calculation tool is built on the basis of combining the vortex lattice method and the Formulation 1A of Farrasat, which is one of solutions of the Ffowcs Williams-Hawkings (FW-H) equation.

12p viengels 25-08-2023 3 2   Download

An approximate method is proposed for determining the aerodynamic effect of coherent vortex structures (CVS) of atmospheric turbulence on an aircraft. As a source of the CVS the vortex wind wakes arising when the atmospheric wind flows around the mountain massif of the Son Tra peninsula, located near the Da Nang airport, and the vortex wake behind the Su-27 type aircraft in the landing configuration are considered.

20p viwolverine 11-07-2023 7 2   Download

PM2.5 is the particulate matter with aerodynamic diameter of 2.5 µm or less, which is the root cause of haze event. Although there is no detailed standard for haze episode, haze is generally defined as a phenomenon characterized by visibility of ~8km, high concentration of particulate matter, relative humidity of less than 90%, following by certain weather conditions of very low wind speed of < 1 m/s and suppressed planetary boundary layer height.

3p vipriyankagandhi 27-07-2022 1 1   Download

This paper presents the ground effect on the aerodynamic performance of a hawkmoth-like flapping-wing micro air vehicle. An unsteady aerodynamic model based on the potential-flow theory is used to determine the ground effect at several flight conditions. In this research, the program is written in FORTRAN programming language by using OpenMP library for parallel computing.

5p vimelindagates 18-07-2022 9 4   Download

In this study, the flow behavior and drag of the axisymmetric model at subsonic and supersonic speeds were investigated by a numerical approach. The numerical results were validated with previous experimental results to determine the model's accuracy.

10p vihassoplattner 04-01-2022 14 1   Download

This paper presents an approach using the CFD method to build a calculated model for studying aerodynamic interaction between the main rotor and helicopter fuselage. The calculated model consists of two components which are the main rotor and helicopter fuselage, that is capable of determining the aerodynamic characteristics of the main rotor in consideration of the influence of the helicopter fuselage.

9p cothumenhmong11 05-05-2021 27 1   Download

The aim of this study is to examine the flow through unmanned aerial vehicles (UAV) including the main wing, tail and body and to calculate the aerodynamic force on the horizontal tail when rotating the elevator using the Fluent software for the viscous flows. Small disturbance theory was used to calculate the longitudinal stability of the UAV when controlling the elevator. Flying qualities are assessed to show that changes in the aerodynamic characteristics of the wing, tail, fuselage and configuration of the UAV may be required.

15p nguaconbaynhay11 07-04-2021 17 0   Download

This paper presents an experimental and numerical simulation to investigate a hybrid vertical axis wind turbine model highly efficient which can be worked at low wind speed by studying the aerodynamic characteristics of four models of hybrid VAWTs. The hybrid WT consists of the SWT having two blades and the DWT type straight having two blades.

17p cleopatrahuynh 01-06-2020 42 1   Download

This article carries out the numerical simulation of airflow over three dimensional car models using ANSYS Fluent software. The calculations have been performed by using realizable k- turbulence model. The external airflow field of the simplified BMW M6 model with or without a wing is simulated. Several aerodynamic characteristics such as pressure distribution, velocity contours, velocity vectors, streamlines, turbulence kinetic energy and turbulence dissipation energy are analyzed in this study.

10p abcxyz123_02 03-03-2020 11 0   Download

This paper will use computational fluid dynamics (CFD) to investigate the effects of a shroud to the thrust and power of a 9.5-inch rotor and 15-inch rotor. The results show that at the same rpm, a shrouded rotor can produce 20% more thrust than a free rotor.

6p vistockholm2711 13-12-2019 17 0   Download

Numerical results show that the local compressibility depends on not only the speed but also the incidence. At arather great angle of attack, local supersonic regions can appear with free Mach numbers in the order of 0.3 - the Mach number is normally considered as a speed of incompressible flows.

10p thienthanquydu 21-10-2018 43 1   Download

The paper presents the results of theoretical and experimntal studies of the aerodynamic characteristics of a wing-in-surface-effect ship (WISES), which was made under coordination of the Institute of Mechanics, Vietnamese Academy of Science and Tech nology.

12p thienthanquydu 21-10-2018 25 0   Download

This computational method allows solving inviscid problems for wings with thickness profile. The experimental and numerical results are compared to each other to verify the built program that permits to extend the range of applications with the variation of wing profiles, wing planforms, and incidence angles.

13p thienthanquydu 19-10-2018 21 0   Download

The forces and moments the vehicle receives from the surrounding air depend more on the shape of the body than on the characteristics of the chassis. A detailed study of motor vehicle aerodynamics is thus beyond the scope of a book dealing with the automotive chassis. However, aerodynamic forces and moments have a large influence on the longitudinal performance of the vehicle, its handling and even its comfort, so it is not possible to neglect them altogether.

49p hiruscar 19-10-2010 68 7   Download

CHAPTER 58 STEAM TURBINES William G. Steltz Ttarboflow International Inc. Orlando, Florida 58.1 58.2 HISTORICAL BACKGROUND THE HEAT ENGINE AND ENERGY CONVERSION PROCESSES SELECTED STEAM THERMODYNAMIC PROPERTIES BLADEPATHDESIGN 58.4.1 Thermal to Mechanical Energy Conversion 1765 58.4.2 58.4.3 58.4.4 1767 58.4.5 58.4.6 1772 58.4.7 1775 1776 58.4.8 58.3 58.

35p hadalabo 29-09-2010 90 8   Download