GB/T 41770-2022Test method for liquid fuel injection using backlit imaging (English PDF)
基于背光成像技术的液体燃料喷射特性测试方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
October 12, 2022
Implementation date
October 12, 2022
Scope
GB/T 41770-2022 is the English-translated version of 基于背光成像技术的液体燃料喷射特性测试方法.
GB/T 41770-2022 is the Chinese national test method for liquid fuel sprays observed with backlit imaging. It specifies the test equipment, the test conditions, the test steps, the data processing and the test record.
The equipment covers the test environment, the fuel injection system, the image acquisition system and the synchronous control system; the conditions fix the ambient state, the fuel temperature in the tank and at the injector, the state the system has to be in before testing and the injection control parameters.
The steps go from arranging the equipment and setting the shooting area, light source, lens and camera to taking scale images, checking the synchronisation signal, recording and cleaning the optics.
Data processing yields the spray penetration distance and the spray cone angle. It was issued on 12 October 2022 and has applied since 12 October 2022.
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Document preview — GB/T 41770-2022
National Standard of the People's Republic of China
- ICS
- 27.010
- Classification
- F 04
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Preface
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 Test equipment
- 4.1 Liquid fuel injection characteristic test system
- 4.2 Test Environment
- 4.3 Fuel injection system
- 4.4 Image acquisition system
- 4.5 Synchronous Control System
- 5 Test Condition
- 5.1 Test environmental conditions
- 5.2 Tank Fuel Temperature
- 5.3 Injector fuel temperature
- 5.4 System Preparation Conditions
- 5.5 Injection control parameters
- 6 Test Step
- 6.1 Arrange and install test equipment
- 6.2 Adjusting the shooting area
- 6.3 Adjust light source, lens and camera parameters
- 6.4 Taking scale images
- 6.5 Checking the synchronization control signal
- 6.6 Camera recording
- 6.7 Test Record
- 6.8 Cleaning Optical Components
- 6.9 Repeat Test
- 7 Data processing
- 7.1 Determination of spray penetration distance and spray cone angle
- 7.2 Image processing
- 7.3 Obtaining spray penetration distance and spray cone angle
- 7.4 Data representation
- 8 Test records
- Appendix A (Informative) Principle of Otsu's Method for Calculating Threshold
- Appendix B (informative) Fog beam image program processing method
- Appendix C (Informative) Test Record Format
- Reference
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" drafted.
1 Scope
This document specifies the test equipment, test conditions, and test procedures for liquid fuel injection characteristics testing using backlight imaging technology. The requirements for data processing and test recording were confirmed.
This document applies to injection testing of various liquid fuels.
2 Normative references
The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.
GB/T 27418-2017 Evaluation and representation of measurement uncertainty
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1 Injector
A device that sprays a certain amount of liquid fuel at a higher pressure to disperse it into droplets. [Source: GB/T 10826.2-2008, 2.1, with modifications]
3.2 Injector hole
A hole in the injector head for injecting liquid fuel into the environment. [Source: GB/T 6809.11-2018, 3.3.101, with modifications]
3.3 Inlet socket
The part of the injector body used to install the high-pressure fuel line. [Source: GB/T 10826.2-2008,7.15]
3.4 Intermittent injection
Intermittently supplied fuel injection of liquid fuel.
3.5 Continuous-flow injection
Fuel injection with continuous supply of liquid fuel. [Source: GB/T 6809.11-2018, 3.3.5, with modifications]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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