GB/T 321-1980
Replaced
T/CMA 038-2021
Active
Group standards
T/CMA 038-2021 Calibration Method for Diesel Octane Number Testing Instrument
T/CMA 038-2021
Price:
$ 20.00
Basic Information
Standard Code:
T/CMA 038-2021
Standard Type:
Group standards
Standard Status:
Active
is_force_gb:
no
CCS Name:
Mechanical measurement
ICS Name:
Integrated Metrology and Measurement
Publish Date:
2021-05-20
Implement Date:
2021-06-20
Scope
Main technical content: 1. The diesel cetane number is used to indicate the ignition performance of diesel fuel. It is determined by comparing diesel fuel with a standard fuel under specified operating conditions in a standard engine test. 2. The measurement value represents the ignition delay period of the fuel in a standard test engine under controlled fuel flow rate, injection timing, and compression ratio. 3. The cetane number is defined using two hydrocarbons with very different combustion performance as reference materials: one is cetane, which has excellent combustion performance and is assigned a cetane number of 100; the other is α-methylnaphthalene, which has poor combustion performance and is assigned a cetane number of zero. The higher the cetane number, the better the combustion performance of diesel fuel, and the less likely it is to experience abnormal combustion phenomena such as knocking. The cetane number ranges from 0 to 100, but the typical measurement range is 30 to 65. 4. When the cetane number of the diesel fuel used is too low and does not meet the engine requirements, it can cause delayed ignition in the engine cylinder, leading to abnormal combustion. 5. When the cetane number of the diesel fuel used is too high, due to a very short ignition delay period, the fuel may ignite spontaneously before being mixed evenly with air, resulting in incomplete combustion, causing the engine to emit black smoke and increase fuel consumption, as well as a decrease in power output.