CN105095629B - A kind of wind evil attacking lung computational methods based on measured data - Google Patents

Abstract

The present invention relates to a kind of determine method based on the wind evil attacking lung of measured data, the method comprising the steps of：(1) determine apparent wind load at a single point position on wire；(2) determine that whole shelves wire table is serve as a lookout load；(3) determine the actual wind load of whole shelves wire；(4) determine wind evil attacking lung.The wind evil attacking lung that the method obtains more really has reacted the spatial coherence of wind load, has accurately counted the impact of the strong fluid structure interaction between wire and air-flow.

Description

A kind of wind evil attacking lung computational methods based on measured data

Technical field：

The present invention relates to a kind of wind evil attacking lung determines method, it is more particularly to a kind of blast based on measured data Nonuniformity coefficient determines method.

Background technology：

Wire wind evil attacking lung is firstly the need of to the wind speed along whole shelves arrangement of conductors, and leads under this wind friction velocity The inclination data of line suspension string carries out field measurement, then adopts suitable computational methods, obtains acting on apparent on wire Wind load and actual wind load, both ratio is wind evil attacking lung.

Power industry specification at present《110kV～750kV overhead transmission line design specification》In to provide blast uneven The computing formula of coefficient, but in interpretation of section, how formulas for calculating does not obtain, and is not also given according to actual measurement number Method according to rated wind pressure nonuniformity coefficient measured value.Under this background, the present invention is based on along wire uneven distribution wind Fast data and suspension string inclination data, there is provided one kind is based on the actual wind load of above-mentioned measured data inverse and apparent wind load ratio Value, i.e. the method for wind evil attacking lung.

Content of the invention：

It is an object of the invention to provide a kind of determine method based on the wind evil attacking lung of measured data, the method obtains Wind evil attacking lung more really reacted the spatial coherence of wind load, accurately counted between wire and air-flow The impact of strong fluid structure interaction.

For achieving the above object, the present invention employs the following technical solutions：A kind of blast heterogeneous system based on measured data Number determination method, the method comprising the steps of：

(1) determine apparent wind load at a single point position on wire；

(2) determine that whole shelves wire table is serve as a lookout load；

(3) determine the actual wind load of whole shelves wire；

(4) determine wind evil attacking lung.

The a kind of of present invention offer determines method based on the wind evil attacking lung of measured data, in described step (1) Wind load passes through following formula (1) and determines：

Wherein, ρ is atmospheric density, U_iObserve mean wind speed, φ for certain measuring point_iFor horizontal wind direction and wire bearing of trend Angle, l_iThe conductor length that can represent for this point position place, C_dFor resistance coefficient under current Reynolds Number level for the wire, D is Diameter of wire.

The a kind of of present invention offer determines method based on the wind evil attacking lung of measured data, whole in described step (2) Shelves wire is provided with 1 Wind observation points.

The another preferably a kind of of present invention offer determines method based on the wind evil attacking lung of measured data, described step Suddenly in (2), whole shelves wire is provided with three Wind observation points, and its wind load passes through following formula (2) and determines：

P_c=P_c1+P_c2(2)

Wherein, P_c1Take square, P for whole shelves wire outermost conducting wire hanging point_c2Take for another outermost conducting wire hanging point of whole shelves wire Square.

The further preferably a kind of of present invention offer determines method based on the wind evil attacking lung of measured data, described whole Shelves wire outermost conducting wire hanging point takes square P_c1Determined by following formula (3)：

Wherein, L is wire span, U₁The mean wind speed observing for the first measuring point, φ₁Observe level for the first measuring point Wind direction and the angle of wire bearing of trend；U₂The mean wind speed observing for the second measuring point, φ₂Observe level for the second measuring point Wind direction and the angle of wire bearing of trend；U₃The mean wind speed observing for the 3rd measuring point, φ₃Observe level for the 3rd measuring point Wind direction and the angle of wire bearing of trend.

The another preferably a kind of of present invention offer determines method based on the wind evil attacking lung of measured data, described whole Shelves wire another outermost conducting wire hanging point takes square P_c2Determined by following formula (4)：

Wherein, L is wire span, U₆The mean wind speed observing for the 6th measuring point, φ₆Observe level for the 6th measuring point Wind direction and the angle of wire bearing of trend；U₅The mean wind speed observing for the 5th measuring point, φ₅Observe level for the 5th measuring point Wind direction and the angle of wire bearing of trend；U₄The mean wind speed observing for the 4th measuring point, φ₄Observe level for the 4th measuring point Wind direction and the angle of wire bearing of trend.

The another preferably a kind of of present invention offer determines method based on the wind evil attacking lung of measured data, described step Suddenly in (3), actual wind load passes through following formula (5) determination：

Wherein, W_dFor at certain conducting wire hanging point distribution wire and suspension string gravity,It is corresponding with the Wind observation time period Suspension string dip mean in period.

The another preferably a kind of of present invention offer determines method based on the wind evil attacking lung of measured data, described step Suddenly the wind evil attacking lung in (4) passes through following formula (6) determination：

α=P_m/P_C(6)

With immediate prior art ratio, the present invention provides technical scheme to have following excellent effect

1st, the present invention is based on measured data analysis and realizes, and preferably can consider many factors, such as roughness of ground surface, turbulent flow The impact of the strong Coupling effect of seepage rock deformation of integral scale, especially wire and ambient gas, the wind evil attacking lung obtaining is more True and reliable；

2nd, the present invention is that actual measurement wire wind evil attacking lung is laid a good foundation；

3rd, the present invention is to obtain wire wind evil attacking lung, there is provided measurement method is supported with measured data；

4th, the blast inequality coefficient degree of accuracy drawing of the method for the present invention is high.

Brief description

Fig. 1 is the inventive method schematic flow sheet；

Fig. 2 is that certain continuous two grades of wire table of the present invention serve as a lookout load along the distribution schematic diagram of wire；

1- anemobiagraph mount point position；2- suspension string dipmeter mount point position.

Specific embodiment

With reference to embodiment, the invention will be described in further detail.

Embodiment 1：

As shown in Figure 1-2, the invention of this example is for obtaining blast under the conditions of 300m span for the LGJ-800/70 type wire not It is uniformly distributed coefficient.Wind observation point position and suspension string angle of wind deflection observation station position are arranged as shown in Figure 1.In continuous two grades of shelves Away from interior, one Wind observation point of arrangement, 6 Wind observation points altogether in every 1/3rd spans.

It is primarily based on formula (1) and calculate the apparent wind load P at each point position₁～P₆, its calculating parameter value is as shown in appendix 1.

Wherein, ρ is atmospheric density, U_iObserve mean wind speed, φ for certain measuring point_iFor horizontal wind direction and wire bearing of trend Angle, l_iThe conductor length that can represent for this point position place, C_dFor resistance coefficient under current Reynolds Number level for the wire, D is Diameter of wire.

Determining the apparent wind load P at each point position₁～P₆Afterwards, conducting wire hanging point A is taken with square, row moment of flexure equilibrium equation, can obtain Following relational expression：

Wherein, L is wire span, U₁The mean wind speed observing for the first measuring point, φ₁Observe level for the first measuring point Wind direction and the angle of wire bearing of trend；U₂The mean wind speed observing for the second measuring point, φ₂Observe level for the second measuring point Wind direction and the angle of wire bearing of trend；U₃The mean wind speed observing for the 3rd measuring point, φ₃Observe level for the 3rd measuring point Wind direction and the angle of wire bearing of trend.

Conducting wire hanging point B is taken with square, row moment of flexure equilibrium equation, following relational expression can be obtained：

Wherein, L is wire span, U₆The mean wind speed observing for the 6th measuring point, φ₆Observe level for the 6th measuring point Wind direction and the angle of wire bearing of trend；U₅The mean wind speed observing for the 5th measuring point, φ₅Observe level for the 5th measuring point Wind direction and the angle of wire bearing of trend；U₄The mean wind speed observing for the 4th measuring point, φ₄Observe level for the 4th measuring point Wind direction and the angle of wire bearing of trend.

Then there is following relational expression at hanging point C：

Load serve as a lookout obtaining whole shelves wire table in parameter substitution above formula in subordinate list 1 for P_CFor 2185N.

LGJ-800/70 every meter of quality 2.791kg of type wire, has shared the weight of the long wire of 300m at C hanging point shown in accompanying drawing 1 Power 8205N, suspension string quality 147.5kg, then the W at hanging point C_dFor 9650.5N.Corresponding with air speed data in present period outstanding Hang down string dip meanFor 10 °, by W_dWithValue obtains in following formula (5), P_mFor 1701.6N.Again by P_mAnd P_CValue is updated to formula (6) obtaining wind evil attacking lung α in is 0.6421.

α=P_m/P_C(6)

Wherein, W_dFor at certain conducting wire hanging point distribution wire and suspension string gravity,It is corresponding with the Wind observation time period Suspension string dip mean in period.

Table 1

ρ(kg/m3)	Cd	l1～l6(m)	D(m)	U1sinφ1
					1.225	1.1	100	0.039	16.8
U2sinφ2	U3sinφ3	U4sinφ4	U5sinφ5	U6sinφ6
					18.0	18.5	18.0	16.8	14.8

Finally it should be noted that:Above example is only not intended to limit in order to technical scheme to be described, to the greatest extent Pipe has been described in detail to the present invention with reference to above-described embodiment, and those of ordinary skill in the art should be understood：Still may be used Modified or equivalent with the specific embodiment to the present invention, and repair without departing from any of spirit and scope of the invention Change or equivalent, it all should be covered in the middle of present claims scope.

Claims (7)

1. a kind of method is determined based on the wind evil attacking lung of measured data it is characterised in that：Methods described includes following step Suddenly：

(1) determine apparent wind load at a single point position on wire；

(2) determine that whole shelves wire table is serve as a lookout load；

(3) determine the actual wind load of whole shelves wire；

(4) determine wind evil attacking lung；

Wind load in described step (1) passes through following formula (1) and determines：

$P_i=0.5{\mathrm{\ρU}}_i^2{\sin }^2{\mathrm{\φ}}_i{C}_d{l}_{i}D---\left(1\right)$

Wherein, ρ is atmospheric density, U_iObserve mean wind speed, φ for certain measuring point_iFolder for horizontal wind direction and wire bearing of trend Angle, l_iThe conductor length that can represent for this point position place, C_dFor resistance coefficient under current Reynolds Number level for the wire, D is wire Diameter.

2. as claimed in claim 1 a kind of method is determined based on the wind evil attacking lung of measured data it is characterised in that：Institute State whole shelves wire in step (2) and be provided with 1 Wind observation points.

3. as claimed in claim 2 a kind of method is determined based on the wind evil attacking lung of measured data it is characterised in that：Institute State whole shelves wire in step (2) and be provided with three Wind observation points, its wind load passes through following formula (2) and determines：

P_c=P_c1+P_c2(2)

Wherein, P_c1Take square, P for whole shelves wire outermost conducting wire hanging point_c2Take square for another outermost conducting wire hanging point of whole shelves wire.

4. as claimed in claim 3 a kind of method is determined based on the wind evil attacking lung of measured data it is characterised in that：Institute State whole shelves wire outermost conducting wire hanging point and take square P_c1Determined by following formula (3)：

$P_{c1}=0.5{\mathrm{\ρC}}_{d}D\left(\frac{L}{3}\right)\{1/6U_1^2{\mathrm{sin\φ}}_1^2+3/6U_2^2{\mathrm{sin\φ}}_2^2+5/6U_3^2{\mathrm{sin\φ}}_3^2\}---\left(3\right)$

Wherein, L is wire span, U₁The mean wind speed observing for the first measuring point, φ₁Observe horizontal wind direction for the first measuring point Angle with wire bearing of trend；U₂The mean wind speed observing for the second measuring point, φ₂Observe horizontal wind direction for the second measuring point Angle with wire bearing of trend；U₃The mean wind speed observing for the 3rd measuring point, φ₃Observe horizontal wind direction for the 3rd measuring point Angle with wire bearing of trend.

5. as claimed in claim 3 a kind of method is determined based on the wind evil attacking lung of measured data it is characterised in that：Institute State another outermost conducting wire hanging point of whole shelves wire and take square P_c2Determined by following formula (4)：

$P_{c2}=0.5{\mathrm{\ρC}}_{d}D\left(\frac{L}{3}\right)\{1/6U_6^2{\mathrm{sin\φ}}_6^2+3/6U_5^2{\mathrm{sin\φ}}_5^2+5/6U_4^2{\mathrm{sin\φ}}_4^2\}---\left(4\right)$

Wherein, L is wire span, U₆The mean wind speed observing for the 6th measuring point, φ₆Observe horizontal wind direction for the 6th measuring point Angle with wire bearing of trend；U₅The mean wind speed observing for the 5th measuring point, φ₅Observe horizontal wind direction for the 5th measuring point Angle with wire bearing of trend；U₄The mean wind speed observing for the 4th measuring point, φ₄Observe horizontal wind direction for the 4th measuring point Angle with wire bearing of trend.

6. as claimed in claim 4 a kind of method is determined based on the wind evil attacking lung of measured data it is characterised in that：Institute State actual wind load in step (3) and pass through following formula (5) determination：

$P_m=W_{d}tan\stackrel{\‾}{\mathrm{\θ}}---\left(5\right)$

Wherein, W_dFor at certain conducting wire hanging point distribution wire and suspension string gravity,It is the period corresponding with the Wind observation time period Interior suspension string dip mean.

7. as claimed in claim 6 a kind of method is determined based on the wind evil attacking lung of measured data it is characterised in that：Institute State the wind evil attacking lung in step (4) and pass through following formula (6) determination：

α=P_m/P_C(6).