**1. Introduction**

Decarbonizing the transportation sector is the highest priority to reduce global warming, air pollution and associated health hazards. There is a need to develop ultralow carbon or carbon-negative fuels which can be produced from renewable sources like waste, organic substances, plants and trees etc. DME is a low cost, low carbon and zero soot and PM chemical stock that can be used on CI engines. DME can be produced from various feedstocks such as wood, methanol, wastes, biomass etc. Its use as a substitute for diesel fuel is due to high cetane number of 55–60 and superior combustion characteristics. It is a colorless, non-toxic, mildly narcotic and easily inflammable gas at normal temperature and pressure similar to LPG.

Many CI engine manufacturers like Isuzu, Nissan, Mitsubishi, Volvo have developed DME fueled CI engine powered vehicles. DME vehicle's reliability have been validated in the field with running tests of 100,000 Km or more. DME fueled CI engines exhibit higher combustion efficiency and soot free combustion in comparison to corresponding diesel engines.

Diesel engines are used widely in power generation industry. Expansion of the power generation sector is fueling the growth of diesel engine production. Global diesel power engine market is estimated to grow at a CAGR of more than 3.5% during the period from 2021 to 2026. Demand for reliable electricity due to the industrial expansion, development of commercial infrastructure, electrification of human habitats, and uninterrupted power supply is the major cause for the growth of diesel engine power market [1]. Therefore, there is a valid case for developing these engines to operate on DME.
