scholarly journals MEASUREMENT OF FLUID-STRUCTURE INTERACTION OF WIND TURBINES IN WIND TUNNEL EXPERIMENTS: CONCEPT AND FIRST RESULTS

2019 ◽  
Vol XLII-2/W18 ◽  
pp. 143-149
Author(s):  
S. Nietiedt ◽  
M. Goering ◽  
T. Willemsen ◽  
T. T. B. Wester ◽  
L. Kröger ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
Rotor Blade ◽  
Spatial Information ◽  
Measurement Techniques ◽  
Rotor Blades ◽  
Wind Flow ◽  
Wind Tunnel Experiments ◽  
Fluid Structure ◽  
Measurement Concept ◽  
Wind Flows

Abstract. Fluid-structure interactions are crucial for the design of rotor blades of wind power systems. Up to now, the mutual interactions between rotor blades and turbulent wind flows have been treated by complex simulations or were observed at individual discrete points. In this paper, a measurement concept is presented where spatial information of the motion/deformation of a rotating wind turbine as well as the wind flow are recorded in wind tunnel experiments. Wind flow and motion behaviour are recorded simultaneously and contactless. Techniques from the field of photogrammetry and flow measurement techniques are combined, resulting in high demands on the measurement concept. Furthermore, solutions for the realisation of a common coordinate system as well as for the synchronisation of both measuring systems are presented. In addition, the validation of the entire measurement concept is carried out based on of some wind tunnel tests in which a single rotor blade is used for the moment. This showed that the measurement concept and the proposed solutions for the simultaneous recording of wind flows and rotor blade movements are suitable in principle and that movements can be recorded and reconstructed with high accuracy.

Wind flow and sedimentation in artificial vegetation: Field and wind tunnel experiments

Geomorphology ◽  
2019 ◽  
Vol 337 ◽  
pp. 165-182 ◽  
Author(s):  
Patrick A. Hesp ◽  
Yuxiang Dong ◽  
Hong Cheng ◽  
Jennifer L. Booth
Keyword(s):  
Wind Tunnel ◽  
Wind Flow ◽  
Wind Tunnel Experiments ◽  
Artificial Vegetation

scholarly journals The splash function for snow from wind-tunnel measurements

2004 ◽  
Vol 38 ◽  
pp. 71-78 ◽  
Author(s):  
James N. McElwaine ◽  
Norikazu Maeno ◽  
Konosuke Sugiura
Keyword(s):  
Wind Tunnel ◽  
Mass Transport ◽  
Physical Properties ◽  
Wind Flow ◽  
Ejection Velocity ◽  
Wind Tunnel Experiments ◽  
Wind Tunnel Measurements ◽  
The Mean ◽  
Horizontal Momentum ◽  
Determining Factor

AbstractIn wind transport of snow, horizontal momentum is extracted from the mean wind flow and transferred to the snow grains. Upon colliding with the surface the grains can bounce and eject further grains in a process known as splashing. How efficiently the horizontal momentum is converted to vertical momentum in the splash process is the determining factor for mass-transport rates. This paper discusses wind-tunnel experiments performed to calculate the splash function for snow particles. The data are used to develop a new splash function. Particular care is taken to include correlations in the data such as between ejection velocity and ejection angle. The new splash function includes these correlations, and its parameters are related to physical properties of the bed and snow.

The ABC Helicopter

1969 ◽  
Vol 14 (4) ◽  
pp. 10-19 ◽  
Author(s):  
M. C. Cheney
Keyword(s):  
Wind Tunnel ◽  
Rotor Blades ◽  
Small Scale ◽  
Wind Tunnel Experiments ◽  
Forward Flight ◽  
Basic Principles ◽  
Stability And Control ◽  
Analytical Research ◽  
And Control

Presented is an introduction to the basic principles of the Advancing Blade Concept (ABC) rotor and a review of the related experimental and analytical research conducted in support of the Sikorsky ABC helicopter program. The ABC helicopter is comprised of two coaxial, counter‐rotating rotors having blades rigidly attached to the hub except for feathering freedom. The blades are significantly stiffer than conventional rotor Blades and are capable of supporting large moments without excessive tip deflections. Improved forward flight efficiency and the elimination of retreating blade stall results from the ability of the ABC rotor to utilize to a large extent the lifting potential of the advancing blades—a capability not present in conventional single rotors. Results of various small‐scale wind tunnel experiments are presented along with summaries of several analytical investigations which were conducted to provide information concerning rotor performance, blade dynamics, vibration, and stability and control

Dynamic Instability of Spatial Structures under Typical Wind Flow

2011 ◽  
Vol 295-297 ◽  
pp. 1738-1741
Author(s):  
You Qin Huang ◽  
Ji Yang Fu
Keyword(s):  
Wind Speed ◽  
Wind Tunnel ◽  
Double Layer ◽  
Dynamic Instability ◽  
Wind Flow ◽  
Spatial Structures ◽  
High Wind ◽  
High Wind Speed ◽  
Large Span ◽  
Wind Flows

The mechanism of dynamic instability of large span spatial structures under high wind speed should be studied carefully, but it has seldom been done before. In this paper, a double-layer cylindrical reticulated shell under a typical wind flow is taken as an example to study the dynamic instability of large span spatial structures under wind flows. The interaction of the shell and the flow is ignored and unsteady wind forces on the shell are obtained from wind tunnel tests. The dynamic instability status of the shell is determined by the Budiansky-Roth criterion. The results show that the double-layer cylindrical reticulated shell will become dynamically instable under high wind speed.

A Modular Transonic Turbine Cascade for Cooled Rotor Metal Effectiveness Investigations

2019 ◽  
Author(s):  
James A. Parker ◽  
Ed Romero ◽  
Thomas Povey
Keyword(s):  
Rotor Blade ◽  
Measurement Techniques ◽  
Turbine Rotor ◽  
High Accuracy ◽  
Rotor Blades ◽  
Blow Down ◽  
Cooling Systems ◽  
Ir Camera ◽  
University Of Oxford ◽  
The University

Abstract The Metal Effectiveness Rotor Cooling (MERC) facility at the University of Oxford is a new blow-down linear cascade tunnel developed for aerothermal research of turbine rotor blade and rotor platform cooling systems. A high level of engine similarity is achieved with matched Mach numbers, Reynolds numbers, coolant-to-mainstream pressure ratios, and Biot number (using DMLS components of appropriate conductivity). The modular working section includes five blade passages, including platform and fir tree root geometries, and engine representative hub seals. The facility is designed to allow high accuracy IR camera measurement of the blade and platform surfaces (for metal effectiveness measurements) and downstream area traverse measurements. Detailed traverse measurements are possible in a single run, because of the long run time of the facility (up to 5 minutes). The facility is being used for development and optimisation research of novel blade and platform cooling systems, with an emphasis on overall thermal performance of parts (metal effectiveness). Modular cassettes allow the blade components to be rapidly interchanged, and for variations to the designs of the front and rear hub seals. The engine representative seals and coolant feed paths allow for all engine leakage flows to be replicated in the experiment. This is important, because they are influential in determining the platform cooling flow structure (character and extent of secondary flow) and overall metal effectiveness result. Coolant supplied to each of the hub seals, and blade shank pocket can be independently varied to achieve required mass flows and pressure ratios. Rotor blades are typically manufactured using DMLS, allowing fast development and optimisation of fully-featured cooling systems at significantly reduced cost compared to traditional casting techniques. To demonstrate the capability of the new facility, we present full-surface metal-effectiveness measurements of the rotor blade platforms (post-processed using high-accuracy infrared thermography techniques separately developed at the University of Oxford.) The purpose of this paper is to outline the capabilities of the facility, describe the prior work and research context which led to its development, and to demonstrate the accuracy of the measurement techniques employed by presenting typical measured data. An argument is made for the importance of including realistic hub seal leakage paths in experiments investigating platform cooling flows by illustrating their significant impact on overall cooling performance. The MERC facility is a response to the need to develop more advanced rotor platform cooling schemes for future engines.

Sign in / Sign up

Export Citation Format

Share Document