Windmill-electric generating unit

FIELD: wind-power engineering; wind power generators.

SUBSTANCE: proposed windmill-electric generating unit has electric generators; novelty is that this unit is made in the form of flow-through piping network with sealed valves and pressure transducers, generating unit ends being disposed in areas held at different atmospheric pressures; piping length and diameter meet following expression: D/L = ρλv

2m
/2ΔP.

EFFECT: provision for continuous operation of windmill-electric generating unit.

1 cl, 1 tbl

 

The invention relates to a device for using renewable energy, and more specifically to the use of wind generators.

The use of moving air streams known since ancient times (mills) and is used today to generate electricity using wind power plants [1, 2, 3]. The power of modern wind power is 2.5 MW, and when the length of the turbine blades in 37.5 m they can operate at wind speeds between 3 m/s to 25 m/s [4]. The disadvantage of these devices is the frequency of work related to local weather conditions and wind speed at the location of the station. Closest to the claimed is setup described in [4] and representing a wind power plant comprising a generator with the turbine mounted on the bearing support, but it also does not work in continuous mode.

The objective of the invention is the provision of continuous operation of the wind energy installation.

This object is achieved in that the wind power installation, including power generators, according to the invention is made in the form of a network flow pipelines with leak-proof valves and pressure sensors at the ends of the plants are located in areas with different atmospheric pressure, and the length is of Truboprovod L and diameter D provide air flow in the pipe with an average velocity v cfrequired for work to be placed in the pipeline generators, and satisfy the following relations:

where D is the diameter of the pipeline;

L is the length of the pipeline connecting parts with different atmospheric pressure,

Δ d - difference of atmospheric pressure at the open on the atmosphere of the pipe sections;

ρ - the density of the medium (air ρ =1.2 kg/m3);

λ =λ (v) the coefficient of friction;

vcf- the average speed of air flow required for operation of the generator.

Using the natural conditions of the atmosphere of the planet Earth - the passage of cyclones and anticyclones, the presence of stationary zones with different atmospheric pressure on one level, it is proposed to direct the flow of air through the pipeline from areas with high atmospheric pressure to areas of low pressure and thereby to ensure a continuous flow in the pipeline.

The air flow in the pipeline is capable of producing the work, for example, to set in motion posted in advance in the pipeline turbine generators to generate electricity, move cargo, etc by Using filtering systems, such a pipeline can be used to clean the air from harmful impurities and to obtain water. Thus, it is proposed environmentally friendly devices is the use of renewable energy.

Standard atmospheric pressure at sea level is 101325 PA, but it greatly varies from 88000 to 108000 PA (Δ ρextr20000 PA ≈ 200 mbar) and depends on both time and space. In addition, there are stationary area of low and high pressure (latitudinal changes)that define the main directions of movement of air masses on the planet [5]. If you connect the pipeline places with low blood pressure with places increased pressure, due to the pressure differential at the ends of the pipeline it will naturally occur to the flow of air from areas of high atmospheric pressure in the area of low atmospheric pressure. The creation of a network of pipelines with leak-proof valves and pressure sensors, which can be used to control the direction of air flow, will effectively be used as latitudinal zones and the range of movement of cyclones and anticyclones to create a continuous air flow in the pipe and use it to generate electricity or moving loads.

Estimate the flow rate of air in the pipe of length L and diameter D when the pressure drop Δ R=R1-R2at the ends of the pipeline. The volume flow of air through a pipe of length L and diameter D op is Adelaide from Poiseuille flow equation:

and the average speed of air flow can be determined from the expression

where S is the cross-sectional area of the pipeline, a η - the coefficient of dynamic viscosity for air η =2× 10-5PA/sec.

Let the air flow speed in the pipe vcf=10 m/s, the pipe length L is chosen equal to 3000 km (estimate of the length of the pipeline from a point with latitude 30° - area of high pressure to a point 60° - an area of low pressure gives L ≈ 2π R3/12≈ 3200 km).

Please rate according to the formula Poiseuille flow the diameter of such pipe D when the pressure difference at the ends of the pipeline 10-15 mbar

However, the formula Poiseuille flow works in laminar motion, when the Reynolds number Re<ReCrete=1160. The Reynolds number is determined from the relationship

where ρ - the density of the medium (air ρ =1.2 kg/m3).

When the number of Re>ReCreteto determine the value of velocity, use the value

where λ =λ (v) the coefficient of friction. The coefficient of friction is defined as a function of two independent variables

where δcf=δ /D is the relative roughness of the pipe. The value of the coefficient of friction is assumed in the calculations in advance. Calculating for a given friction coefficient is the average flow velocity vcfdetermine the value of Re number, and then according to published data [5] specify the coefficient of friction λ . The updated value λ used to Refine the average speed.

From a comparison of formulas (1) and (5) shows that in cases where Re>RCretethe dependence of the average velocity of flow of air from the pipe diameter becomes weak, and to preserve the value of the average flow rate for a given length of pipeline needed to significantly increase its diameter. The length of the rotor blades of modern wind power plants far exceeds the size of 3.1 m, obtained from (3). For example, the length of the turbine blades ltwind farm SUDW1ND S-77/1,5MW firm NOR-DEX 1.5 MW reaches 37.5 m [4].

We will use the formula (4) and estimate the flow rate in a pipe of diameter D=100 m ~2ltand length L when the pressure changes at the ends of the pipeline from 10 to 200 mbar. In the calculations we will assume that the pipe has a smooth wall, i.e. we neglect the roughness of the pipeline.

The results of calculations of the average velocity of air flow for different lengths of pipe with the pressure difference of Δ P=10-200 mbar is shown in the table.

Table.
L, km 50010003000
vcfm/s6,9-33,34,6-23,62,6-12,6

The magnitude of the average velocity of air flow in a pipe of diameter D=100 m and a length of 3000 km, the resulting estimates correspond to the operating conditions of modern wind power plants.

Thus, a device that enables efficient use of moving air streams to generate electricity using wind generators. The possibility of electricity generation is placed in the pipe of modern wind generators when moving it air masses due to the natural difference of atmospheric pressure.

Directional air flow in the pipeline can be used to move cargo from areas of high pressure to low pressure area. Using filtering systems, such a pipeline can be used to clean the air from harmful impurities, and the ability to condense water from the air passing through the pipeline, will allow you to get fresh water.

Literature

1. Golding E.W., Harris R I. The generation of electricity by wind power. London : E. And F. N. Spon, New York, Halsted Press Bock, John Willey and Song, 1977.

2. Wind Power. Ed. D. de Renzo: TRANS. from English. Bev and Maufacture. M: Energoatom the Izdat, 1982.

3. Wind power plants abroad (status and prospects): background research Institute of inform. and technology. Econ. issled. in electrical engineering (Informalsector), IZANA Center. publishing, Analytics. M., 1990.

4. The prospectus of the company NORDEX 2001 (http://www.nordex.de).

5. Handbook of Geophysics and Space Environments. Scientific Editor Shea L. Valley. Air Force Cambridge Research Laboratories. McGRAW-HILL BOOK COMPANY, INC New York, San Francisco, Toronto, London, Sydney, 1965.

6. Idelchik I.E. Handbook of hydraulic resistance. State Energy Publishing house, M.-L., 1960.

Wind power installation, including generators, characterized in that the installation is made in the form of a network flow pipelines with leak-proof valves and pressure sensors at the ends of the plants are located in areas with different atmospheric pressure and pipe length L and diameter D provide air flow in the pipe with an average velocity Vcfrequired for work to be placed in the pipeline generators, and satisfy the following relations:

where D is the diameter of the pipeline;

L is the length of the pipeline connecting parts with different atmospheric pressure;

Δd - difference of atmospheric pressure at the open on the atmosphere of the pipe sections;

ρ - the density of the medium (air is a ρ = 1.2 kg/m3);

λ=λ(v) the coefficient of friction;

vcf- the average speed of air flow required for operation of the generator.



 

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