CN104199995A - Temperature compensation method for initial pressure of single-corrugation elastic oil tank - Google Patents

Temperature compensation method for initial pressure of single-corrugation elastic oil tank Download PDF

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Publication number
CN104199995A
CN104199995A CN201410333715.9A CN201410333715A CN104199995A CN 104199995 A CN104199995 A CN 104199995A CN 201410333715 A CN201410333715 A CN 201410333715A CN 104199995 A CN104199995 A CN 104199995A
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China
Prior art keywords
oil pressure
tank
fuel tank
initial oil
symmetry
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CN201410333715.9A
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Chinese (zh)
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CN104199995B (en
Inventor
刘晶石
贾伟
姜铁良
田超
肖良瑜
陈光辉
吕桂萍
钟苏
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哈尔滨电机厂有限责任公司
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation

Abstract

The invention relates to a temperature compensation method for the initial pressure of a single-corrugation elastic oil tank. Through the method, fluid, solid and heat multi-field coupling analysis can be carried out on the single-corrugation elastic oil tank of a hydroelectric generating set. According to the oil tank initial pressure, initial pressure equivalent temperature rise and other data obtained through analysis, the temperature compensation formula of the initial pressure of the single-corrugation elastic oil tank is derived. The oil tank initial oil pressure obtained after temperature compensation is calculated according to the formula. According to the method, the temperature compensation formula of the initial pressure is derived, and the compensation method is simple in process. The influence of temperature on the oil tank initial pressure is considered, and the calculation precision is high. The great significance in optimization design of the single-corrugation elastic oil tank is achieved.

Description

The temperature compensation of single-ripple elastic tank original pressure
Technical field
The present invention relates to the temperature compensation of single-ripple elastic tank original pressure.
Background technology
Single-ripple elastic tank is the critical component of vertical hydropower generator thrust support structure, have load between easy to adjust, self-poise watt is installed, thrust bearing shoe valve tilts flexibly and control preferably the advantages such as watt distortion.
Self elasticity of relying on single-ripple elastic tank supports the gravity load of Hydropower Unit, and himself elasticity is comprised of two parts, is respectively the elasticity of turbine oil in the elasticity of toroidal membrane casing and fuel tank.After toroidal membrane structure is determined, its casing elasticity is also determined, and the elasticity of fuel tank internal turbine oil is adjustable.By adjusting the elasticity of turbine oil, can make toroidal membrane be operated in ideal height, make stress level minimum.
The flexible method of turbine oil in casing of adjusting has:
1) change the volume of ring type filling and then change the oil-filled amount of box house turbine oil;
2) change the initial oil pressure of fuel tank.
Traditional single-ripple elastic tank analytical approach, has only considered the elasticity of tank body of oil tank and inner turbine oil, and does not consider the variation of turbine oil thermal expansion and fuel tank initial oil pressure stressed to the fuel tank causing.The thermal expansivity of oil than thermal expansion metal coefficient approximately large 10 times, therefore ignores the fuel tank STRESS VARIATION that turbine oil thermal expansion produces, and makes the initial oil pressure error of fuel tank that calculates larger, and causes stress level in fuel tank operational process to raise.
Summary of the invention
The invention provides a kind of temperature compensation of single-ripple elastic tank original pressure.Utilize the method to carry out coupled multiphysics analysis to Hydropower Unit single-ripple elastic tank.The data such as the fuel tank original pressure obtaining according to analysis, original pressure equivalence temperature rise, the temperature compensation formula of derivation single-ripple elastic tank original pressure.According to the initial oil pressure of fuel tank after the compensation of formula accounting temperature.The derived temperature compensation formula of original pressure of the method, compensation method process is succinct; Considered the impact of temperature on the initial oil pressure of fuel tank, computational accuracy is higher.Significant to single-ripple elastic tank optimal design.The technical scheme of the technical program is:
1) use business software to set up single-ripple elastic tank coupled multiphysics analytical model, Model Selection fuel tank 1/4 shaft section is analytic target.Fuel tank adopts PLANE42 unit; Oil adopts FLUID79 unit.Oil tank material elastic model is 2.068e5MPa, Poisson ratio 0.3; The springform of oil measures 1.5e3MPa, and thermal expansivity is got 2.3e-4;
2) at axis of symmetry and the plane of symmetry, apply symmetry constraint, on oily border, apply Complete Bind, at fuel tank end face, apply longitudinal restraint, oil is applied to tentative calculation temperature rise load T 1;
3) utilize business finite element software to solve, extract longitudinal support reaction F of fuel tank end face 1, and calculate the initial oil pressure equivalence of fuel tank temperature rise, computing formula is as follows:
T 2 = T 1 F 1 · F 2
T in formula 2for the initial oil pressure equivalence of fuel tank temperature rise
T 1for tentative calculation temperature rise
F 2for single-ripple elastic tank design load
F 1longitudinal support reaction of the fuel tank end face obtaining for tentative calculation temperature rise
4) at axis of symmetry and the plane of symmetry, apply symmetry constraint, on oily border, apply Complete Bind, at fuel tank end face, apply longitudinal restraint, oil is applied to initial oil pressure equivalence temperature rise load T 2;
5) utilize business finite element software to solve, extract the stress level of the desirable operating condition of single-ripple elastic tank;
6) at axis of symmetry and the plane of symmetry, apply symmetry constraint, on oily border, apply Complete Bind, discharge fuel tank end face degree of freedom, keep the initial oil pressure equivalence temperature rise T of oil 2;
7) utilize business finite element software to solve, extract the initial oil pressure numerical value of toroidal membrane P 0, and stress level;
8) according to initial oil pressure P 0with initial oil pressure equivalence temperature rise T 2, the temperature compensation formula of the initial oil pressure of derivation single-ripple elastic tank is:
P = P 0 T 2 · ( T - T 0 + T 2 )
In formula, P is the initial oil pressure after temperature compensation;
P 0for not considering the initial oil pressure of temperature compensation;
T is oil-filled temperature;
T 0fuel tank oil temperature while installing for unit;
T 2for initial oil pressure equivalence temperature rise.
9) according to the initial oil pressure after the temperature compensation formula accounting temperature compensation of the initial oil pressure of single-ripple elastic tank, above-mentioned steps is the temperature compensation of single-ripple elastic tank original pressure.
Technique effect
Compared with prior art, the invention has the beneficial effects as follows:
Existing single-ripple elastic tank analytical approach, has only considered the elasticity of tank body of oil tank and inner turbine oil, and does not consider the variation of turbine oil thermal expansion and fuel tank initial oil pressure stressed to the fuel tank causing.The thermal expansivity of oil than thermal expansion metal coefficient approximately large 10 times, therefore ignores the fuel tank STRESS VARIATION that turbine oil thermal expansion produces, and makes the initial oil pressure error of fuel tank that calculates larger, and causes stress level in fuel tank operational process to raise.
The invention provides a kind of temperature compensation of single-ripple elastic tank original pressure.Utilize the method to carry out coupled multiphysics analysis to Hydropower Unit single-ripple elastic tank.The data such as the fuel tank original pressure obtaining according to analysis, original pressure equivalence temperature rise, the temperature compensation formula of derivation single-ripple elastic tank original pressure.According to the initial oil pressure of fuel tank after the compensation of formula accounting temperature.The derived temperature compensation formula of original pressure of the method, compensation method process is succinct; Considered the impact of temperature on the initial oil pressure of fuel tank, computational accuracy is higher.Significant to single-ripple elastic tank optimal design.
Accompanying drawing explanation
Fig. 1 is the temperature compensation process flow diagram of single-ripple elastic tank original pressure
Fig. 2 is single-ripple elastic tank structural representation
Fig. 3 is single-ripple elastic tank coupled multiphysics analytical model schematic diagram
Embodiment
As shown in Figure 1, the temperature compensation of single-ripple elastic tank original pressure, operation steps is as follows:
1) use business software to set up single-ripple elastic tank coupled multiphysics analytical model, Model Selection fuel tank 1/4 shaft section is analytic target.Fuel tank adopts PLANE42 unit; Oil adopts FLUID79 unit.Oil tank material elastic model is 2.068e5MPa, Poisson ratio 0.3; The springform of oil measures 1.5e3MPa, and thermal expansivity is got 2.3e-4;
2) at axis of symmetry 12 and the plane of symmetry 11, apply symmetry constraint, on oily border 13, apply Complete Bind, at fuel tank end face 1, apply longitudinal restraint, oil 10 is applied to tentative calculation temperature rise load T 1;
3) utilize business finite element software to solve, extract longitudinal support reaction F of fuel tank end face 1 1, and calculate the initial oil pressure equivalence of fuel tank temperature rise, computing formula is as follows:
T 2 = T 1 F 1 · F 2
T in formula 2for the initial oil pressure equivalence of fuel tank temperature rise
T 1for tentative calculation temperature rise
F 2for single-ripple elastic tank design load
F 1longitudinal support reaction of the fuel tank end face 1 obtaining for tentative calculation temperature rise
4) at axis of symmetry 12 and the plane of symmetry 11, apply symmetry constraint, on oily border 13, apply Complete Bind, at fuel tank end face 1, apply longitudinal restraint, oil 10 is applied to initial oil pressure equivalence temperature rise load T 2;
5) utilize business finite element software to solve, extract the stress level of the desirable operating condition of single-ripple elastic tank;
6) at axis of symmetry 12 and the plane of symmetry 11, apply symmetry constraint, on oily border 13, apply Complete Bind, discharge fuel tank end face 1 degree of freedom, keep the initial oil pressure equivalence temperature rise T of oil 10 2;
7) utilize business finite element software to solve, extract the initial oil pressure numerical value of toroidal membrane P 0, and stress level;
8) according to initial oil pressure P 0with initial oil pressure equivalence temperature rise T 2, the temperature compensation formula of the initial oil pressure of derivation single-ripple elastic tank is:
P = P 0 T 2 · ( T - T 0 + T 2 )
In formula, P is the initial oil pressure after temperature compensation;
P 0for not considering the initial oil pressure of temperature compensation;
T is oil-filled temperature;
T 0fuel tank oil temperature while installing for unit;
T 2for initial oil pressure equivalence temperature rise.
9) according to the initial oil pressure after the temperature compensation formula accounting temperature compensation of the initial oil pressure of single-ripple elastic tank, above-mentioned steps is the temperature compensation of single-ripple elastic tank original pressure.
As shown in Figure 2, single-ripple elastic tank is partly comprised of casing, Zhi Tie, ring type filling and turbine wet goods, when fuel tank end face bears unit load, relies on the elasticity of compression of casing elasticity and interior oil to carry out support loads.
As shown in Figure 3, single-ripple elastic tank coupled multiphysics analytical model, model comprises tank body of oil tank and turbine oil two parts, by defining corresponding material properties, realizes its coupled multiphysics analysis.

Claims (1)

1. a temperature compensation for single-ripple elastic tank original pressure, its feature
Be: this operation steps is as follows:
1) use business software to set up single-ripple elastic tank coupled multiphysics analytical model, Model Selection fuel tank 1/4 shaft section is analytic target, and fuel tank adopts PLANE42 unit; Oil adopts FLUID79 unit, and oil tank material elastic model is 2.068e5MPa, Poisson ratio 0.3; The springform of oil measures 1.5e3MPa, and thermal expansivity is got 2.3e-4;
2) at axis of symmetry (12) and the plane of symmetry (11), apply symmetry constraint, in oily border (13), apply Complete Bind, at fuel tank end face (1), apply longitudinal restraint, oil (10) is applied to tentative calculation temperature rise load T 1;
3) utilize business finite element software to solve, extract longitudinal support reaction F of fuel tank end face (1) 1, and calculate the initial oil pressure equivalence of fuel tank temperature rise, computing formula is as follows:
T 2 = T 1 F 1 · F 2
T in formula 2for the initial oil pressure equivalence of fuel tank temperature rise;
T 1for tentative calculation temperature rise;
F 2for single-ripple elastic tank design load;
F 1longitudinal support reaction of the fuel tank end face (1) obtaining for tentative calculation temperature rise;
4) at axis of symmetry (12) and the plane of symmetry (11), apply symmetry constraint, in oily border (13), apply Complete Bind, at fuel tank end face (1), apply longitudinal restraint, oil (10) is applied to initial oil pressure equivalence temperature rise load T 2;
5) utilize business finite element software to solve, extract the stress level of the desirable operating condition of single-ripple elastic tank;
6) at axis of symmetry (12) and the plane of symmetry (11), apply symmetry constraint, in oily border (13), apply Complete Bind, discharge fuel tank end face (1) degree of freedom, keep the initial oil pressure equivalence temperature rise T of oil (10) 2;
7) utilize business finite element software to solve, extract the initial oil pressure numerical value of toroidal membrane P 0, and stress level;
8) according to initial oil pressure P 0with initial oil pressure equivalence temperature rise T 2, the temperature compensation formula of the initial oil pressure of derivation single-ripple elastic tank is:
P = P 0 T 2 · ( T - T 0 + T 2 )
In formula, P is the initial oil pressure after temperature compensation;
P 0for not considering the initial oil pressure of temperature compensation;
T is oil-filled temperature;
T 0fuel tank oil temperature while installing for unit;
T 2for initial oil pressure equivalence temperature rise;
9) according to the initial oil pressure after the temperature compensation formula accounting temperature compensation of the initial oil pressure of single-ripple elastic tank, above-mentioned steps is the temperature compensation of single-ripple elastic tank original pressure.
CN201410333715.9A 2014-07-15 2014-07-15 The temperature compensation of single-ripple elastic tank initial pressure CN104199995B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102182649A (en) * 2011-03-31 2011-09-14 天津市天发重型水电设备制造有限公司 Process for assembling single-ripple elastic oil tank of hydro-power generating unit
CN103267681A (en) * 2013-04-25 2013-08-28 同济大学 Method and device for measuring oil volume elastic modulus
CN103837116A (en) * 2012-11-20 2014-06-04 天津市天发重型水电设备制造有限公司 Positioning plate of thickness gauge for measuring thickness of corrugation thickness of elastic oil tank

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102182649A (en) * 2011-03-31 2011-09-14 天津市天发重型水电设备制造有限公司 Process for assembling single-ripple elastic oil tank of hydro-power generating unit
CN103837116A (en) * 2012-11-20 2014-06-04 天津市天发重型水电设备制造有限公司 Positioning plate of thickness gauge for measuring thickness of corrugation thickness of elastic oil tank
CN103267681A (en) * 2013-04-25 2013-08-28 同济大学 Method and device for measuring oil volume elastic modulus

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
丁淑华 等: ""水轮发电机单波纹弹性油箱刚强度性能计算方法研究"", 《上海大中型电机》 *
李娜: ""基于适用于大中型水轮发电机组的单波纹弹性油箱有限元计算"", 《黑龙江水利科技》 *
王燕 等: ""基于 ANSYS 的多波纹弹性油箱刚强度计算分析"", 《上海大中型电机》 *

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