GB/Z 44630-2024Hydraulic machines - Francis turbine pressure fluctuation transposition (English PDF)
水力机械 混流式水轮机压力脉动换算
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
September 29, 2024
Implementation date
September 29, 2024
Scope
GB/Z 44630-2024 is the English-translated version of 水力机械 混流式水轮机压力脉动换算.
GB/Z 44630-2024 is the Chinese standard "Hydraulic machines - Francis turbine pressure fluctuation transposition".
Its scope clause reads: This document provides the conversion method for pressure pulsation under Francis turbine and Francis pump-turbine conditions, including. --- Description of pressure pulsation, phenomena causing pressure pulsation and related issues; ---This document covers pressure pulsation types including but not limited to blade vortex, draft tube vortex and dynamic and static interference between runner and guide vane; ---It shows that the operating conditions and the Thomas number (cavitation coefficient) are the main factors affecting the pressure pulsation; --- Recommended methods for measuring and analyzing pressure pulsation; --- Methods for identifying potential resonances of model test benches and prototypes; --- Determine the method of converting the model test results to the prototype, or provide a statistical or empirical prediction of the pressure pulsation of the prototype. method; --- Recommended pressure pulsation data acquisition system, including the type and installation location of the model and prototype sensors, and the definition of the model and prototype Similar conditions between types; --- A method of presentation for comparing the pressure pulsation measurement results of a model turbine with those of a corresponding prototype turbine is introduced; ---Discusses the parameters used to convert from model to prototype, such as peak-to-peak value, RMS value or standard deviation at 97% confidence level in the time domain.
The error is the relationship between the main frequency and the transfer frequency obtained by FFT transformation in the frequency domain; --- The uncertainty of pressure pulsation conversion from model to prototype is discussed; --- The factors that affect the conversion are discussed, including the parts that cannot be simulated on the model test bench, such as the prototype's water delivery system and mechanical system; --- Established the conversion method of different types of pressure pulsation; --- Recommended possible methods to reduce pressure pulsation; ---Defines the limitations of this document.
This document is applicable to the unit under normal operating conditions and does not include hydraulic stability related to Karman vortex, transient process, runaway condition and no-load.
Qualitative phenomenon. This document provides a method for identifying potential resonances in model test benches and prototypes. It does not involve the conversion of resonance conditions to actual conditions.
If resonance exists, the conversion method provided in this document is no longer applicable. In this case, it is impossible to determine the pressure pulsation between the model and the prototype. relation.
This document does not deal with the construction details of hydraulic machinery, nor with the mechanical properties of its components, as long as these characteristics do not affect the model pressure pulses. The relationship between the pressure pulsations of the model or prototype.
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Document preview — GB/Z 44630-2024
National Standard of the People's Republic of China
- ICS
- 27.140
- Classification
- K 55
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Preface
- 1 Scope
- 2 Normative references
- 3 Terms, definitions, symbols and units
- 3.1 General terms
- 3.2 Unit
- 3.3 Summary of terms, definitions, symbols and units in this document
- 4 Introduction to pressure pulsation phenomenon
- 4.1 Overview
- 4.2 Overview of pressure pulsation
- 4.3 Overview of Francis Turbine Draft Tube Pressure Pulsation
- 4.4 Detailed introduction to pressure pulsation phenomenon
- 5 Pressure pulsation measurement and analysis methods
- 5.1 General Principles
- 5.2 Model turbine pressure pulsation
- 5.3 Prototype turbine pressure pulsation
- 5.4 Analysis, presentation and interpretation of test results
- 6 Confirmation of potential resonances in model test benches and prototypes
- 6.1 General Principles
- 6.2 Test bench resonance identification
- 6.3 Possible resonance and self-excited vibration of the prototype
- 7 Conversion method and process
- 7.1 General Principles
- 7.2 Parameters affecting conversion
- 7.3 Conversion of related quantities
- 7.4 Convertible pressure pulsation types
- 7.5 Statistical analysis of model and prototype conversion accuracy
- 8 Mitigation measures
- 8.1 Draft tube vortex phenomenon
- 8.2 Leaf vortex
- 8.3 Dynamic and static interference
- 8.4 Operating restrictions
- Appendix A (Informative) Pressure Pulsation Recording Example
- Appendix B (Informative) Model test typical pressure pulsation sensor parameters
- Appendix C (Informative) Dynamic Calibration of Pressure Pulsation Sensor
- Appendix D (Informative) Remote Pressure Pulsation Measurement Correction
- Appendix E (Informative) Forced Response Analysis of Francis Turbine under Partial Load Operation
- Appendix F (Informative) Effect of Cavitation Coefficient on Pressure Pulsation
- Appendix G (Informative) Conversion of synchronous pressure pulsation of Francis turbine under off-design conditions
- Appendix H (Informative) Statistical Analysis of Pressure Pulsation Data
- Appendix I (Informative) Collected Pressure Pulsation Mathematics
- References
1 Scope
This document provides the conversion method for pressure pulsation under Francis turbine and Francis pump-turbine conditions, including.
--- Description of pressure pulsation, phenomena causing pressure pulsation and related issues;
---This document covers pressure pulsation types including but not limited to blade vortex, draft tube vortex and dynamic and static interference between runner and guide vane;
---It shows that the operating conditions and the Thomas number (cavitation coefficient) are the main factors affecting the pressure pulsation;
--- Recommended methods for measuring and analyzing pressure pulsation;
--- Methods for identifying potential resonances of model test benches and prototypes;
--- Determine the method of converting the model test results to the prototype, or provide a statistical or empirical prediction of the pressure pulsation of the prototype.
method;
--- Recommended pressure pulsation data acquisition system, including the type and installation location of the model and prototype sensors, and the definition of the model and prototype
Similar conditions between types;
--- A method of presentation for comparing the pressure pulsation measurement results of a model turbine with those of a corresponding prototype turbine is introduced;
---Discusses the parameters used to convert from model to prototype, such as peak-to-peak value, RMS value or standard deviation at 97% confidence level in the time domain.
The error is the relationship between the main frequency and the transfer frequency obtained by FFT transformation in the frequency domain;
--- The uncertainty of pressure pulsation conversion from model to prototype is discussed;
--- The factors that affect the conversion are discussed, including the parts that cannot be simulated on the model test bench, such as the prototype's water delivery system and mechanical system;
--- Established the conversion method of different types of pressure pulsation;
--- Recommended possible methods to reduce pressure pulsation;
---Defines the limitations of this document.
This document is applicable to the unit under normal operating conditions and does not include hydraulic stability related to Karman vortex, transient process, runaway condition and no-load.
Qualitative phenomenon.
This document provides a method for identifying potential resonances in model test benches and prototypes. It does not involve the conversion of resonance conditions to actual conditions.
If resonance exists, the conversion method provided in this document is no longer applicable. In this case, it is impossible to determine the pressure pulsation between the model and the prototype.
relation.
This document does not deal with the construction details of hydraulic machinery, nor with the mechanical properties of its components, as long as these characteristics do not affect the model pressure pulses.
The relationship between the pressure pulsations of the model or prototype.
2 Normative references
The contents of the following documents constitute essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
IEC 60193.2019 Hydraulic turbines, storage pumps and pump-turbine model acceptance tests
Note. GB/T 15613-2023 Acceptance test of turbines, storage pumps and pump-turbine models (IEC 60193.2019, IDT) […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 102 pages — is available in the English PDF.
Referenced standards
Normative references
IEC 60193:2019
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