Browse Publications Technical Papers 2018-01-1143

Investigations on the Determination of the Service Methane Number of LNG 2018-01-1143

LNG is a fuel that is under increasing discussion for transport purposes. It differs from CNG because it often has a higher concentration of hydrocarbons > C4. This affects knocking in a negative way. The knocking properties of a gaseous fuel are characterized by the Methane Number (MN) which is defined as the methane content in a mixture of methane and hydrogen which has the same knocking properties as the gas under investigation. It was defined by AVL in the late 1960s. In contrast to the Octane or Cetane Number there is no standardized measurement procedure for the MN, because the equipment AVL used was unique and does not exist anymore. But AVL created a calculation methodology based on the large amount of data they had measured. There are several software implementations of this methodology. Further there are other algorithms which are not based on the AVL data. If an MN is measured on an arbitrary engine the result is called a Service Methane Number (SMN). It usually shows the same tendencies as the MN but different absolute values. For a set of LNGs the SMNs are measured on two single cylinder SI test engines of 200 and 600 cc swept volume. Different approaches to measure the SMN are investigated. Further, several calculation methods are compared with the measurements.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 16% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:

HCCI Engines Combustion of CNG Fuel with DME and H2 Additives


View Details


Combustion Characteristics and Generating Efficiency Using Biogas with Added Hydrogen


View Details


Improving the Turbulent Combustion Performance of Lean Methane Mixture by Hydrogen Addition


View Details