CN101599101B - Calculation method for water flow quantity of branch paths of generator rotor winding - Google Patents

Calculation method for water flow quantity of branch paths of generator rotor winding Download PDF

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CN101599101B
CN101599101B CN2009100541389A CN200910054138A CN101599101B CN 101599101 B CN101599101 B CN 101599101B CN 2009100541389 A CN2009100541389 A CN 2009100541389A CN 200910054138 A CN200910054138 A CN 200910054138A CN 101599101 B CN101599101 B CN 101599101B
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water
water resistance
rotor
resistance
branch road
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钟后鸿
梁旭彪
胡磊
赵玉
刘明慧
何明艳
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Shanghai Electric Power Generation Equipment Co Ltd
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Abstract

The present invention relates to a calculation method for the water flow quantity of branch paths of a generator rotor winding. The method comprises the following steps: firstly, a water resistance model is established, the element water resistance R4<j> of each branch path of a rotor winding water path in the model is in offset parallel connection, other element water resistances are in parallel connection, then a total hydraulic head P of the rotor water path is calculated and obtained, whereafter the Reynolds number Re2 of a hollow conducting wire of the rotor and the resistance value of each element water resistance in the water resistance model are calculated, and finally, m equations are obtained by a formula and are solved so as to obtain the water quantity of each generator rotor winding branch path. The calculation method for the water flow quantity of branch paths of a generator rotor winding provided by the present invention has the advantages that the actual connection of the water paths can be truly reflected, and the water flow quantity of rotor winding branch paths can be accurately obtained.

Description

A kind of computing method of water flow quantity of branch paths of generator rotor winding
Technical field
The present invention relates to a kind of computing method of water flow quantity of branch paths of generator rotor winding, be applicable to that the rotor winding adopts the generator of internal water cooling, the discharge that belongs in the generator overall design is calculated the method and technology field.
Background technology
When carrying out the generator designs of water-cooled rotor, need the suitable rotor discharge of design, to satisfy the requirement of abundant cooled rotor.Rotor winding water route is to be made of the different branch road of multichannel structure different in size, and the discharge of accurately calculating each branch road is vital to the temperature that the control cooling effect differs from one tunnel water route most.Computing method are in the past supposed each branch road parallel connection, and each branch road of actual rotor winding water route is that dislocation is series-parallel.Therefore, computing method in the past can not must reflect truly that actual water route connects, and the rotor winding strands road discharge that calculates thus also is coarse.
Summary of the invention
The purpose of this invention is to provide a kind of computing method that can truly reflect the connection of actual water route and can accurately obtain rotor winding strands road discharge.
In order to achieve the above object, technical scheme of the present invention has provided a kind of computing method of water flow quantity of branch paths of generator rotor winding, it is characterized in that, step is:
Step 1, set up the water resistance model, at the element water resistance of this each branch road of model rotor winding water route
Figure GSB00000354115300011
Be the parallel connection that misplaces, other element water resistances are then in parallel;
Step 2, basis
Figure GSB00000354115300012
Calculate the total hydraulic head P in rotor water route, wherein, P ABe rotor water inlet pressure head, P BBe the centrifugal head that the rotor rotation produces, γ is the density of water, R BBe the water dumping radius, n is a rotating speed;
Step 3, first basis Calculate rotor hollow core conductor (technical term claims " rotor winding ") Reynolds number R E2, wherein, d 2Be rotor hollow core conductor hydraulic diameter, v is the kinematic viscosity of water, V 2For the speed of current in the rotor hollow core conductor, by Reynolds number R E2Look into the water resistance curve, can draw the resistance coefficient λ (technical term claims " on-way resistance coefficient ") that water flows through one section pipe range, again basis
Figure GSB00000354115300021
Calculate the resistance of rotor winding water resistance, wherein, it is long-pending that g is that acceleration of gravity, A are that water flows through element cross-section, and l is that water flows through the element length overall, d is that element hydraulic diameter, ξ are coefficient of shock resistance;
Step 4, according to generator amature water route computation model, there is M possible branch road in the rotor water route from the import to the outlet, because the total hydraulic head in rotor water route
Figure GSB00000354115300022
Wherein, m is a rotor water branch road, and its value is m 〉=1, R 0Be the water route part water resistance that each branch road current of generator amature winding pool together, q 0Be the water route part water yield that each branch road current of generator amature winding pool together, R mBe the water resistance of m generator amature winding branch road, q mBe the water yield of m generator amature winding branch road, can obtain thus that water route, m road is arranged, the flow on every road is all unknown, therefore M unknown number is just arranged, and water route, M road is arranged, and just has M Equation is separated this M about branch road flow q mEquation, promptly obtain the water yield of each generator amature winding branch road.
The present invention proposes the water resistance model that a true generator amature of reflection divides the branch road current, method provided by the invention can adopt the mathcad software programming under windows operating system.
Advantage of the present invention is: can truly reflect the connection of actual water route and can accurately obtain rotor winding strands road discharge.
Description of drawings
Fig. 1 is the process flow diagram of the computing method of a kind of water flow quantity of branch paths of generator rotor winding provided by the invention;
Fig. 2 is a water resistance illustraton of model provided by the invention.
Embodiment
Specify the present invention below in conjunction with embodiment.
Embodiment
As shown in Figure 1, be the process flow diagram of the computing method of a kind of water flow quantity of branch paths of generator rotor winding provided by the invention, its concrete steps are:
Step 1, foundation water resistance model as shown in Figure 2 are at the element water resistance of this each branch road of model rotor winding water route
Figure GSB00000354115300031
Be the parallel connection that misplaces, other element water resistances are then in parallel;
Step 2, basis
Figure GSB00000354115300032
Calculate the total hydraulic head P in rotor water route, wherein, P ABe rotor water inlet pressure head (unit is P), P BBe the centrifugal head (unit is P) that the rotor rotation produces, γ is that (unit is 1000kg/m for the density of water 3), R BBe water dumping radius (unit is m) that n is rotating speed (unit is rpm);
Step 3, first basis
Figure GSB00000354115300033
Calculate rotor hollow core conductor (technical term claims " rotor winding ") Reynolds number R E2, wherein, d 2Be rotor hollow core conductor hydraulic diameter, v is the kinematic viscosity of water, V 2Speed for current in the rotor hollow core conductor.By Reynolds number R E2Look into the water resistance curve, can draw the resistance coefficient λ (technical term claims " on-way resistance coefficient ") that water flows through one section pipe range.Basis again Calculate the resistance of rotor winding water resistance, wherein, it is long-pending that g is that acceleration of gravity, A are that water flows through element cross-section, and l is that water flows through the element length overall, d is that element hydraulic diameter, ξ are coefficient of shock resistance.
According to Reynolds number R E2Difference, the computing formula that the on-way resistance coefficient lambda adopts are also different, specifically see following table for details:
Annotate: Δ-water route absolute roughness, m
Figure GSB00000354115300035
Step 4, according to generator amature water route computation model (see figure 2), there is M possible branch road in the rotor water route from the import to the outlet.Because the total hydraulic head in rotor water route
Figure GSB00000354115300036
Wherein, m is a rotor water branch road, and is general and generator amature groove number equal, commonly 24,28,32,36 etc., but the method for this patent all can be regarded as more than 1 the tunnel, and M=16 in the present embodiment, R 0Be the water route part water resistance that each branch road current of generator amature winding pool together, q 0The water route part water yield that pools together for each branch road current of generator amature winding; R mBe the water resistance of m generator amature winding branch road, q mIt is the water yield of m generator amature winding branch road.Can obtain thus, water route, M road is arranged, the flow on every road is all unknown, and therefore M unknown number just arranged.Water route, M road is arranged, just have M
Figure GSB00000354115300041
Equation.Separate this M about branch road flow q mEquation, promptly obtain the water yield of each generator amature winding branch road.
In this process, also need to judge whether to satisfy solving condition, this is because separating polynary quadratic equation will use iteration, will the user import an initial flow earlier.This flow does not influence final result calculated, just the initial value of numerical analysis.But if value and actual value differ too big (for example poor several thousand times), numerical evaluation just might can not find the result.Choosing of initial value is not difficult, and up to the present the generator amature water yield is generally at 20 tons/hour～60 tons/hour.The arbitrary value that the user gets between 10 tons～100 tons/hour is all feasible, on average arrives m water route and gets final product as initial value.
As shown in Figure 2, the water resistance model comprises the element water resistance R of the limbers (be called for short " rotor bore ") of that open at the armature spindle center, water inlet usefulness 1, rotor inlet water tank element water resistance
Figure GSB00000354115300042
(h=1, h=2), the diversion of rotor inlet water tank are to the water inlet aqueduct element water resistance of rotor winding
Figure GSB00000354115300043
(1≤i≤a, a 〉=1), the element water resistance of each branch road of rotor winding water route
Figure GSB00000354115300044
(1≤j≤b, b 〉=1) and the diversion of rotor winding are to the water outlet aqueduct element water resistance of rotor inlet water tank
Figure GSB00000354115300045
(1≤k≤c, c 〉=1).Each element water resistance
Figure GSB00000354115300046
Back in parallel and element water resistance R 1Series connection, the element water resistance of first generator amature winding branch road
Figure GSB00000354115300047
Two ends connect first element water resistance respectively
Figure GSB00000354115300048
With first element water resistance The element water resistance of last generator amature winding branch road Two ends connect last element water resistance respectively With last element water resistance
Figure GSB000003541153000412
J element water resistance An end and j-1 element water resistance
Figure GSB000003541153000414
An end connect the back altogether and connect i element water resistance
Figure GSB000003541153000415
J element water resistance
Figure GSB000003541153000416
The other end and j+1 element water resistance
Figure GSB000003541153000417
An end connect the back altogether and connect k+1 element water resistance In Fig. 2, rotor bore element water resistance R 1, rotor inlet water tank element water resistance
Figure GSB000003541153000419
Water inlet aqueduct element water resistance
Figure GSB000003541153000420
The element water resistance of each branch road of rotor winding water route
Figure GSB000003541153000421
And water outlet aqueduct element water resistance
Figure GSB000003541153000422
Number be respectively 1,2,8,16 and 9 (generators of respective rotor 32 grooves).The element water resistance
Figure GSB000003541153000423
With the element water resistance
Figure GSB000003541153000424
Back in parallel and element water resistance R 1Series connection, element water resistance and element water resistance Respectively with the element water resistance
Figure GSB000003541153000427
With the element water resistance
Figure GSB000003541153000428
Directly connect the element water resistance of residue branch road Connect back and element water resistance in twos altogether
Figure GSB00000354115300052
Connect, as the element water resistance of second branch road
Figure GSB00000354115300053
An end and the element water resistance of the 3rd branch road
Figure GSB00000354115300054
An end connect back Connection Element water resistance altogether
Figure GSB00000354115300055
The rest may be inferred; And the element water resistance of each branch road
Figure GSB00000354115300056
The other end according to adjacent in twos connection back and element water resistance smoothly
Figure GSB00000354115300057
Be connected, such as the element water resistance of first branch road
Figure GSB00000354115300058
An end and the element water resistance of second branch road
Figure GSB00000354115300059
An end connect back Connection Element water resistance altogether The element water resistance of each branch road is staggered being arranged in parallel in this model like this.
Become after the program operation to import input value as shown in table 1 on computers with the mathcad software programming method provided by the invention:
The computer program input data list of table 1 water flow quantity of branch paths of generator rotor winding
Figure GSB000003541153000511
Can obtain result as shown in table 2:
The computer program result of calculation of table 2 water flow quantity of branch paths of generator rotor winding
Figure GSB000003541153000512

Claims (2)

1. the computing method of a water flow quantity of branch paths of generator rotor winding is characterized in that, step is:
Step 1, set up the water resistance model, at the element water resistance of this each branch road of model rotor winding water route
Figure FSB00000521563300011
Be the parallel connection that misplaces, other element water resistances are then in parallel;
Step 2, basis
Figure FSB00000521563300012
Calculate the total hydraulic head P in rotor water route, wherein, P ABe rotor water inlet pressure head, P BBe the centrifugal head that the rotor rotation produces, γ is the density of water, R BBe the water dumping radius, n is a rotating speed;
Step 3, first basis
Figure FSB00000521563300013
Calculate rotor hollow core conductor Reynolds number R E2, wherein, d 2Be rotor hollow core conductor hydraulic diameter, v is the kinematic viscosity of water, V 2For the speed of current in the rotor hollow core conductor, by Reynolds number R E2Look into the water resistance curve, can draw the resistance coefficient λ that water flows through one section pipe range, again basis
Figure FSB00000521563300014
Calculate the resistance of rotor winding water resistance, wherein, it is long-pending that g is that acceleration of gravity, A are that water flows through element cross-section, and 1 for water flows through the element length overall, d is that element hydraulic diameter, ξ are coefficient of shock resistance;
Step 4, according to generator amature water route computation model, there is M possible branch road in the rotor water route from the import to the outlet, because the total hydraulic head in rotor water route
Figure FSB00000521563300015
Wherein, m 〉=1 is a rotor water branch road, R 0Be the water route part water resistance that each branch road current of generator amature winding pool together, q 0The water route part water yield that pools together for each branch road current of generator amature winding; R mBe the water resistance of m generator amature winding branch road, q mBe the water yield of m generator amature winding branch road, can obtain thus that water route, M road is arranged, the flow on every road is all unknown, therefore M unknown number is just arranged, and water route, M road is arranged, and just has M Equation is separated this M about branch road flow q mEquation, promptly obtain the water yield of each generator amature winding branch road.
2. the computing method of a kind of water flow quantity of branch paths of generator rotor winding as claimed in claim 1 is characterized in that, that described water resistance model comprises is that open at the armature spindle center, the element water resistance R of the limbers of water inlet usefulness 1, rotor inlet water tank element water resistance
Figure FSB00000521563300021
H=1, h=2, the diversion of rotor inlet water tank is to the water inlet aqueduct element water resistance of rotor winding 1≤i≤a, a=M/2, the element water resistance of each branch road of rotor winding water route
Figure FSB00000521563300023
1≤j≤b, b=M, and the diversion of rotor winding is to the water outlet aqueduct element water resistance of rotor inlet water tank
Figure FSB00000521563300024
1≤k≤c, c=M/2+1, each element water resistance
Figure FSB00000521563300025
Back in parallel and element water resistance R 1Series connection, the element water resistance of first generator amature winding branch road
Figure FSB00000521563300026
Two ends connect first element water resistance respectively
Figure FSB00000521563300027
With first element water resistance
Figure FSB00000521563300028
The element water resistance of last generator amature winding branch road
Figure FSB00000521563300029
Two ends connect last element water resistance respectively
Figure FSB000005215633000210
With last element water resistance
Figure FSB000005215633000211
J element water resistance
Figure FSB000005215633000212
An end and j-1 element water resistance An end connect the back altogether and connect i element water resistance
Figure FSB000005215633000214
J element water resistance
Figure FSB000005215633000215
The other end and j+1 element water resistance
Figure FSB000005215633000216
An end connect the back altogether and connect k+1 element water resistance Wherein, j=2 ..., b-1.
CN2009100541389A 2009-06-30 2009-06-30 Calculation method for water flow quantity of branch paths of generator rotor winding Active CN101599101B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1162697A (en) * 1997-02-04 1997-10-22 “列宁格勒金属工厂”股份公司 Combined hydro-generators of hydroelectric stations
CN1635689A (en) * 2003-12-31 2005-07-06 中国科学院电工研究所 Internal cooling loop of rotary motor rotor
CN101251867A (en) * 2008-04-03 2008-08-27 昆明理工大学 Pressure conduit circuit equivalence analogy method in course of hydropower station transition

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1162697A (en) * 1997-02-04 1997-10-22 “列宁格勒金属工厂”股份公司 Combined hydro-generators of hydroelectric stations
CN1635689A (en) * 2003-12-31 2005-07-06 中国科学院电工研究所 Internal cooling loop of rotary motor rotor
CN101251867A (en) * 2008-04-03 2008-08-27 昆明理工大学 Pressure conduit circuit equivalence analogy method in course of hydropower station transition

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