CN103775387A - AP1000 nuclear main pump radial direction guide vane hydraulic design - Google Patents

Abstract

The invention relates to an AP1000 nuclear main pump radial direction guide vane hydraulic design. The AP1000 nuclear main pump radial direction guide vane hydraulic design is characterized in that the specificity of a nuclear main pump ball-shaped volute is combined when a nuclear pump guide vane is designed, the requirements for diversion and energy conversion are met, and the requirement for safe and stable operation of a nuclear main pump can be met. The geometrical parameters of the guide vane can be adjusted to meet the requirement for the small energy loss.

Description

Radially stator the Hydraulic Design of AP1000 core main pump

Technical field

The present invention relates to radially stator the Hydraulic Design of AP1000 core main pump, be particularly applicable to the Hydraulic Design of the radially guide vane of spherical pumping chamber.

Background technique

Nuclear reactor coolant main circulating pump is called for short core main pump, is the most critical power equipment of guaranteeing nuclear plant safety and reliable operation, belongs to core I level pump, is unique rotating equipment in nuclear island, is also one of the pressure boundary in a loop.Core main pump long-term stability is moved safely cooling reactor core and is prevented that the generation of nuclear power plant accident is particularly important, and therefore core main pump is often called the heart of nuclear power station.Mixed flow pump pumping chamber is spiral case and two kinds of patterns of spatial guide blade commonly, because the spherical spiral case of uniform section has best bearing capacity, so core main pump adopts spherical pumping chamber, for meeting compact type requirement, be necessary the stator of core main pump to be designed to radially guide vane.Radially the guide vane of stator is made up of the diffusing tube part after helix part and helix.Its purposes is respectively: inner vortex part, be used for guaranteeing the free-flow of liquid in stator, and work to collect liquid; And diffusion section is used for most of kinetic energy to be converted to pressure energy, running up moves can be the effect of pressure energy.

Summary of the invention

In order to make core main pump interior flow field more smooth and easy, the invention provides radially stator the Hydraulic Design of a kind of AP1000 core main pump.Can meet liquid collection and the transformation of energy requirement in core main pump with the stator of the present invention design, be specially adapted to the design of spherical pumping chamber stator.

Technological scheme of the present invention is:

In stator, the axisymmetric of liquid flows, and is the prerequisite of the interior stable relative movement of impeller.For this reason, require the liquid of helix part in stator, be not subject to the effect of any external force and do unrestricted motion by itself inertia.Like this, just stator blade must be made to the streamline shape of this liquid stream.Liquid kinetic energy is converted to pressure energy certainly will have been assigned to by diffusion part, and like this, diffusion section has just determined the degree of perfection of stator hydraulic performance.Radially the effect of guide vane is by the liquid collection flowing out in impeller, and is sent to the spherical pump case of class.Liquid is sent to before pump case, eliminates rotatablely moving of liquid stream, this part rotation function of liquid stream is changed into pressure energy as far as possible.Liquid is sent to before pump case, reduces the flow velocity of liquid stream, to reduce the hydraulic loss in pump case.When liquid stream flows out in impeller, speed is very large, so the hydraulic loss in stator is very large, it accounts for greatly the half left and right of hydraulic loss in whole water pump, thus the design of stator should be specifically noted that, require to reduce the hydraulic loss of stator itself as far as possible.Under design conditions, liquid flows in the time of impeller person who lives in exile stator, requires not produce to clash into lose.Vane inlet limit is designed to parallel with impeller outlet limit, and leaves larger gap, to guarantee even and good the streaming of flow velocity.

Core main pump design condition and major parameter are as follows: design (specified) flow Q=18870m'/h, and lift H=113m, rotation speed n=1780r/min, medium is clear water, 20 ℃ of temperature.

Designing requirement is according to existing core main pump impeller, mixed flow pump design condition and major parameter, and must be that radially guide vane adds the structure of the spherical pump case of class, designs radially guide vane.

1. base circle diameter (BCD) D ₃

D ₃=D ₂+（3～15）mm （1）

D ₂for impeller outer diameter.Impeller clearance between guide vanes is relevant with specific speed size, and 3～15mm is got in suggestion, increases gap and can reduce the efficiency of pump, but move more stable.

2. vane inlet width b ₃

b3=b2+(3-10)mm （2）

In formula, b2 is impeller outlet width.

3. the angle of helix and line style

(1) vane inlet laying angle α ₃

Vane inlet axis plane velocity v _m3with excretion coefficient ψ ₃for

$v_{m3}=\frac{Q}{2\mathrm{\π}{R}_3{b}_3{\mathrm{\ψ}}_3}---\left(3\right)$

${\mathrm{\ψ}}_3=1-\frac{{\mathrm{\δ}}_{3}z}{D_3\mathrm{\π}\sin {\mathrm{\α}}_3}---\left(4\right)$

The vane inlet peripheral compoent of velocity $v_{u3}=\frac{v_{u2}{R}_2}{R_3}---\left(5\right)$

Vane inlet flow angle α ' ₃ $\tan {\mathrm{\α}}_3^{,}=\frac{v_{m3}}{v_{u2}}---\left(6\right)$

In order to improve the shape of stator, desirable vane inlet angle is greater than flow angle,

α ₃=α’ ₃+△α △α=3°～10° (7)

(2) line style of helix part is identical with volute chamber helix

4. determining of stator throat opening area

Conventionally adopt velocity coefficient method to determine throat opening area.

Throat opening area F=Q/ (zv ₃) throat velocity v ₃=0.83k ₃(2gH) ^0.5

F=a ₃b ₃if get a ₃=b ₃, $z=\frac{Q}{b_3^2{v}_3}---\left(9\right)$

A3 is throat's plane width, and b3 is throat's axial plane width.k ₃=0.32。

5. the design of diffuser

(1) inlet-duct area of diffuser is throat opening area F=a ₃b ₃.

(2) recommendation for reference is

F ₄/F ₃=1.45～1.85 D ₄/D ₃=1.25～1.55

L/a ₃=3～4 v4/v3=0.35～0.55 （10）

L is diffuser length.

(3) the bending diffusion of straight diffusion ratio is good, but radial dimension is large.

Determine angle of flare by the equivalent area of a circle

3 °～12 ° of the Application Ranges at angle.

(4) the discharge area F of diffuser ₄=a ₄b ₄, outlet velocity v ₄=Q/ (F ₄z)

Outlet peripheral velocity v _u4=v ₄cos α ' ₄(12)

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the present invention is further described.

Fig. 1 be same embodiment's guide vane teunnion to sectional view, in figure, indicated the symbol of each design parameter.

Embodiment

Fig. 1 has determined this embodiment's stator shape.It is a radially guide vane that is applicable to the spherical pumping chamber of core main pump.The present invention adjusts impeller geometric parameter by following relation, base circle diameter (BCD) D ₃, vane inlet width b ₃, vane inlet laying angle α ₃, the line style R of helix part, stator throat opening area F, the inlet-duct area of diffuser, the discharge area F of diffuser ₄, the outlet diameter D of diffuser ₄, angle of flare

make this embodiment's core main pump meet high-performance, hydraulic loss is simultaneously less.

D ₃=D ₂+（3～15）mm

b3=b2+(3-10)mm

$v_{m3}=\frac{Q}{2\mathrm{\π}{R}_3{b}_3{\mathrm{\ψ}}_3}$

${\mathrm{\ψ}}_3=1-\frac{{\mathrm{\δ}}_{3}z}{D_3\mathrm{\π}\sin {\mathrm{\α}}_3}$

$v_{u3}=\frac{v_{u2}{R}_2}{R_3}$

$\tan {\mathrm{\α}}_3^{,}=\frac{v_{m3}}{v_{u2}}$

α ₃=α’ ₃+△α

F=Q/(zv ₃)

v ₃=0.83k ₃（2gH） ^0.5

F=a ₃b ₃if get a ₃=b ₃,

F ₄/F ₃=1.45～1.85 D ₄/D ₃=1.25～1.55

L/a ₃=3～4 v4/v3=0.35～0.55

F ₄=a ₄b ₄

v ₄=Q/(F ₄z)

v _u4＝v ₄cosα′ ₄

Impeller clearance between guide vanes is relevant with specific speed size, and 3～15mm is got in suggestion, increases gap and can reduce the efficiency of pump, but move more stable.

In order to improve the shape of stator, desirable vane inlet angle is greater than flow angle, △ α=3 °～10 °.

Velocity coefficient k ₃be the function of specific speed, can look into according to pump handbook, the present invention gets k ₃=0.32.

The bending diffusion of straight diffusion ratio is good, but radial dimension is large.

3 °～12 ° of the Application Ranges at angle.

Claims (5)

1. Radially stator the Hydraulic Design of 1.AP1000 core main pump, according to the water conservancy diversion to the spherical pumping chamber inner fluid of core main pump and the requirement of conversion.Impeller geometric parameter comprises, base circle diameter (BCD) D ₃, vane inlet width b ₃, vane inlet laying angle α ₃, the line style R of helix part, stator throat opening area F, the inlet-duct area of diffuser, the discharge area F of diffuser ₄, the outlet diameter D of diffuser ₄, angle of flare

   

   it is characterized in that: between impeller geometric parameter and pump operating point for design performance parameter, be applicable to following relation:

   D ₃=D ₂+（3～15）mm

   b3=b2+(3-10)mm

   

   

   

   

   α ₃=α’ ₃+△α

   

   F=Q/(zv ₃)

   v ₃=0.83k ₃（2gH） ^0.5

   F=a ₃b ₃if get a ₃=b ₃,

   

   F ₄/F ₃=1.45～1.85 D ₄/D ₃=1.25～1.55

   L/a ₃=3～4 v4/v3=0.35～0.55

   

   F ₄=a ₄b ₄

   v ₄=Q/(F ₄z)

   v _u4＝v ₄cosα′ ₄
2. 2. radially stator the Hydraulic Design of AP1000 core main pump claimed in claim 1, is characterized in that: impeller clearance between guide vanes is relevant with specific speed size, and 3～15mm is got in suggestion, increases gap and can reduce the efficiency of pump, but move more stable.
3. 3. radially stator the Hydraulic Design of AP1000 core main pump claimed in claim 1, is characterized in that: in order to improve the shape of stator, desirable vane inlet angle is greater than flow angle, △ α=3 °～10 °.
4. 4. radially stator the Hydraulic Design of AP1000 core main pump claimed in claim 1, is characterized in that: velocity coefficient k3 is the function of specific speed, and can look into according to pump handbook, the present invention gets k ₃=0.32.
5. 5. radially stator the Hydraulic Design of AP1000 core main pump claimed in claim 1, is characterized in that: 3 °～12 ° of the Application Ranges at angle.

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